Description:TECHNICAL FIELD
[0001] The present disclosure relates, in general, to antenna devices, and more specifically, relates to dual-band antennas for narrow band wireless applications

BACKGROUND
[0002] Recently, the use of wireless communication systems has increased rapidly. With the advent of wireless communication system, microstrip antennas have occupied a very important place in electronic design due to several advantages including lighter in weight, lower profile and cost, ease of portability and fabrication, and integration with millimetre/microwave circuits. On the other hand, they also serve features as a suppression of unwanted cross-polarized radiations which increases the quality of far-field characteristics of the antenna. Different wireless communication networks that are working in the present wireless communication system include WiMAX, WLAN, X-Band applications. This focuses on the need to have separate antennas to fulfil the above-said applications, however, this system suffers from limitations like an increase in complexity and space occupied on the printed circuit board (PCB). To overcome the above-said demerits, multiband antennas (single antenna covering several wireless applications) serve the purpose and this technology has been able to attract researchers.
[0003] Multiband antennas employ different techniques to obtain wireless multi-band applications. Few existing multiband antennas can include dielectric resonator antenna resonating for dual-band is used for WiMAX applications. Also, the metamaterial technique is used for multiband antennas which provide resonances for WiMAX and WLAN applications. The addition of slots and stubs to the radiating patch providing a narrow resonance band and hexagonal patch with co-axial fees provides three resonance bands. The multiband antenna occupies an area of 30×50 mm2 also resonates for five bands and etching U-type slots (inverted) and loaded shorting metalized vias provides a multifunctional patch antenna. F-inverted patch with loaded branch line strip (pentaband), three parallel rectangular stubs with T-type inverted slot in-ground (tri-band), a multibranch radiating patch with the complete ground provides multi-resonating bands, and angular ring patch based on Crescent Moon shape provides three center resonating frequencies at higher band. X-shape radiating patch with defected ground structure (DGS), a combination of microstrip and etched asymmetric T-shaped slot, embedding two crossed C-slots on patch with E-shaped slots on the ground, slotted star-shaped patch, and integration of resonators in-ground are the other published work used for multiband applications.
[0004] Dual-band of operation is obtained by mutual coupling and third is obtained by using the thin strip, the third band is resonated. By using stubs on patch and ground, and using parasitic rectangular stub above ground with three inverted S- and C-shaped strips also results in a multifunctional antenna. Lower form factor with two asymmetric meandered-strips, multiple extended stubs on patch with the partial ground, using metamaterial unit cell, fractal geometry with three iterations and biomedical telemetry applications antenna with flexibility resonates at 0.824GHz, 0.975GHz and 1.90GHz-6.00GHz bands. Fork-type circular with centrally placed rectangular stub finds applications for WiMAX and WLAN applications. Asymmetric coplanar strip fed F-type monopole is designed for 2.5/3.5/5.5 GHz band applications. The above discussed multiband antennas use different methods to achieve resonance including stubs, slots, DRAs, fractal geometries, meandered stubs/strips, and metamaterial.
[0005] Therefore, there is a need in the art to provide a means to design a compact multi-band patch antenna suitable for Bluetooth and X-Band applications.

OBJECTS OF THE PRESENT DISCLOSURE
[0006] An object of the present disclosure relates, in general, to antenna devices, and more specifically, relates to dual-band antennas for narrow band wireless applications.
[0007] Another object of the present disclosure is to provide an antenna device that supports Bluetooth and X-Band applications.
[0008] Another object of the present disclosure is to provide an antenna device that can be fabricated easily at low cost.
[0009] Another object of the present disclosure is to provide an antenna device that achieves enhanced impedance bandwidth.
[0010] Another object of the present disclosure provides a compact antenna device.
[0011] Another object of the present disclosure provides excellent radiation patterns in both principle planes were effectively achieved in the design leading to dipole-like and omnidirectional patterns for both bands with very low cross-polarization in corresponding orthogonal planes.
[0012] Yet another object of the present disclosure is to provide an antenna device that maintains stable realized gain in both the operating bands achieving the objective as a potential candidate for multiband applications.

SUMMARY
[0013] The present disclosure relates, in general, to antenna devices, and more specifically, relates to dual- band antennas for narrow band wireless applications.
[0014] In an aspect, the present disclosure provides an antenna device for wireless communication, the device includes a rectangular slotted ground, a radiating patch configured on a substrate, the radiating patch includes a rectangular stub coupled to a feed line, the feed line is integrated with a cable connector to receive an input signal, a T-shape stub is formed on the substrate by merging the feed line and the rectangular stub, and an anchor-shaped stub is embedded in the rectangular slotted ground, wherein on receipt of the input signal, the T-shape stub and the anchor-shaped stub generate a plurality of frequency bands for wireless communication.
[0015] In an embodiment, the antenna device can be a coplanar waveguide (CPW)-fed patch antenna.
[0016] In another embodiment, the plurality of frequency bands comprises any or a combination of Bluetooth and X-Band.
[0017] In another embodiment, the antenna device is fabricated using FR-4 substrate with dielectric permittivity er=4.40 and loss tangent tand=0.02.
[0018] In another embodiment, the T-shaped stub, on receipt of input signal, generates X-band.
[0019] In another embodiment, the anchor-shaped stub, on receipt of the input signal, generates Bluetooth.
[0020] In another embodiment, a set of parameters of the antenna device is optimized to operate the antenna device at an intended operating bandwidth.
[0021] In another embodiment, the set of parameters comprise any or a combination of gap between feed line and ground, ground and radiating patch, length of anchor-shaped stub and length of the rectangular stub.
[0022] In another embodiment, the cable connector is a Sub-Miniature A (SMA) connector.
[0023] Various objects, features, aspects, and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figures in which like numerals represent like components.

BRIEF DESCRIPTION OF THE DRAWINGS
[0024] The following drawings form part of the present specification and are included to further illustrate aspects of the present disclosure. The disclosure may be better understood by reference to the drawings in combination with the detailed description of the specific embodiments presented herein.
[0025] FIG. 1A to FIG. 1B illustrate exemplary front and rear view of the antenna device, in accordance with an embodiment of the present disclosure.
[0026] FIG. 1C illustrates an evolution of the proposed multiband antenna, in accordance with an embodiment of the present disclosure.
[0027] FIG. 1D to FIG. 1G illustrates exemplary optimization of key parameters of the antenna device, in accordance with an embodiment of the present disclosure.
[0028] FIG. 2A to FIG. 2C illustrates the surface current density distribution and study of equivalent circuit model, in accordance with an embodiment of the present disclosure.
[0029] FIG.3A illustrates an exemplary prototype of the antenna device, in accordance with an embodiment of the present disclosure.
[0030] FIG.3B illustrates comparison of simulated and measured results, in accordance with an embodiment of the present disclosure.
[0031] FIG.4A illustrates a far-field results for the designed multiband antenna and comparison of simulated and measured gain of the, in accordance with an embodiment of the present disclosure.
[0032] FIG. 4B illustrates simulated and measured 2-D radiation patterns at Bluetooth, in accordance with an embodiment of the present disclosure.
[0033] FIG. 4C illustrates simulated and measured 2-D radiation patterns at X-Band, in accordance with an embodiment of the present disclosure.

DETAILED DESCRIPTION
[0034] The following is a detailed description of embodiments of the disclosure depicted in the accompanying drawings. The embodiments are in such detail as to clearly communicate the disclosure. If the specification states a component or feature “may”, “can”, “could”, or “might” be included or have a characteristic, that particular component or feature is not required to be included or have the characteristic.
[0035] As used in the description herein and throughout the claims that follow, the meaning of “a,” “an,” and “the” includes plural reference unless the context clearly dictates otherwise. Also, as used in the description herein, the meaning of “in” includes “in” and “on” unless the context clearly dictates otherwise.
[0036] The present disclosure relates, in general, to antenna devices, and more specifically, relates to dual- band antennas for narrow band wireless applications. The present disclosure relates to dual-band antenna specifically designed for narrow Bluetooth (2.402GHz-2.480GHz) and wide X-Band (8.00GHz-12.0GHz) wireless applications. The two bands are obtained by embedding anchor-shaped ground for Bluetooth and rectangular stub attached with microstrip generating X-Band. The feature of the proposed design is occupying an area of 360mm2 and ease of integration including modelling of 50? SMA connector in a simulation environment for better-simulated results. Comparison of results is investigated in simulation and measurement environment for validation. The antenna offers very efficient stable radiation patterns and a maximum measured gain of 5.442dBi suggesting the proposed design is well suited for dual-band applications. The present disclosure can be described in enabling detail in the following examples, which may represent more than one embodiment of the present disclosure.
[0037] FIG. 1A to FIG. 1B illustrate exemplary front and rear view of the antenna device, in accordance with an embodiment of the present disclosure.
[0038] Referring to FIG. 1A, dual-band antenna device 100 (also referred to as device 100, herein) configured for narrow Bluetooth (2.402GHz-2.480GHz) and wide X-Band (8.00GHz-12.0GHz) wireless applications. The dual-band antenna device also interchangeably referred to as a multi-band antenna device. A radiating patch 102 of the device 100 can include a rectangular slotted ground, rectangular stub 104, a T-shape stub 106 and an anchor-shaped stub 108. The two bands are obtained by embedding anchor-shaped stub 108 on the ground for Bluetooth and rectangular stub 104 attached with microstrip generating X-Band. The rectangular stub 104 connected to 50? microstrip line, which is integrated with matched cable connector i.e., SubMiniature version A (SMA) connector to receive an input signal. The T-shape stub 106 can be formed by merging the feed line and the rectangular stub 104. The anchor-shaped stub 108 can be embedded on the rectangular slotted ground. The antenna device 100 offers very efficient stable radiation patterns and a maximum measured gain of 5.442dBi suggesting the proposed design is well suited for dual-band applications.
[0039] The antenna device 100 can include the radiating patch 102 configured on a substrate 112, the radiating patch 102 can include the rectangular stub 104 coupled to a feed line, the feed line is integrated with a cable connector to receive an input signal. The T-shape stub 106 is formed on the substrate 112 by merging the feed line and the rectangular stub 104, and the anchor-shaped stub 108 can be embedded in the rectangular slotted ground, where on receipt of the input signal, the T-shape stub 106 and the anchor-shaped stub 108 generate one or more frequency bands for wireless communication, the one or more frequency bands can include any or a combination of Bluetooth and X-Band. The T-shaped stub 106, on receipt of input signal, generates X-band. The anchor-shaped stub 108, on receipt of the input signal, generates Bluetooth.
[0040] In another embodiment, the set of parameters of the antenna device 100 can be optimized to operate the antenna device at an intended operating bandwidth. The set of parameters comprise any or a combination of gap between feed line and ground, ground and radiating patch, length of anchor-shaped stub and length of the rectangular stub.
[0041] In an exemplary embodiment, the antenna device 100 as presented in the example can be a CPW-fed patch antenna designed fabricated on commercially available FR4 substrate with dielectric permittivity er=4.40 and loss tangent tand=0.02. The proposed design is occupying an area of 360mm2 and ease of integration including modelling of 50? SMA connector in a simulation environment for better-simulated results. The antenna device 100 is excited by the modelled SMA connector in the simulation environment so that there is a very close agreement of the simulated and measured results. Comparison of results is investigated in simulation and measurement environment for validation.
[0042] As shown in FIG. 1A, the antenna device 100, which signifies that the antenna occupies a compact size of Lm×Wm mm2 with a height of the substrate ‘h’mm. The antenna device 100 as presented in the example can be CPW-fed and on the same plane of patch 102 consist rectangular slotted ground as observed from FIG. 1B. As per the observations in FIG. 1B, the radiating patch 102 can include the rectangular stub 104 connected to 50? microstrip line which is integrated with matched SMA connector for the input signal. The radiating patch 102 can include T-shape stub 106, which is formed by merging feed line and rectangular stub 104 that provides matching of X-Band. The radiating patch 102 can include anchor-shaped stub 108 attached to the slotted rectangular ground to generate a Bluetooth band.
[0043] The entire simulation of the proposed multi-band antenna 100 is excited by the modelled SMA connector in the simulation environment so that there is a very close agreement of the simulated and measured results. The proposed antenna design is optimized in the HFSS EM simulator with all the values tabulated in Table 1 given below:
Parameter mm Parameter mm Parameter mm
Lm 18.00 Lf 5.00 W4 2.00
Wm 20.00 Wf 1.50 W5 12.00
hm 0.80 W1 8.00 W6 3.00
g 0.20 W2 9.05 L1 1.00
k 1.00 W3 16.00 L2 4.00
L3 4.18 L4 7.50 L5 11.00

L6 2.50
Table 1: Parameters of proposed multiband
[0044] FIG. 1C illustrates an evolution of the proposed multiband antenna, in accordance with an embodiment of the present disclosure.
[0045] As shown in FIG. 1C, Antenna 1 is developed with the CPW fed microstrip and also include rectangular slotted ground, this provides 2.936GHz-7.895GHz with a center resonating frequency of 5.695GHz. To obtain the first useable resonating band for Bluetooth (2.402GHz-2.480GHz), the anchor-shaped stub 108 is embedded in the rectangular slotted ground which is a modification of Antenna 1. Antenna 2 provides the required lower Bluetooth application band with a narrow bandwidth of 0.08GHz (2.403GHz-2.483GHz) and maximum impedance matching is noted at 2.448GHz with a reflection coefficient of -31.896dB. The second higher band is achieved in Antenna 3, where a rectangular strip is placed perpendicular to the microstrip. This is the proposed dual-band antenna working for Bluetooth and X-Band applications.
[0046] FIG. 1D to FIG. 1G illustrates exemplary optimization of key parameters of the antenna device, in accordance with an embodiment of the present disclosure.
[0047] The effects of different parameters that affect the lower and higher bandwidth, a parametric study is carried on the key parameters, which are shown in FIG. 1D. In the present disclosure, the gap between feed and ground ‘g’, ground and radiating patch ‘k’, length of anchor-shaped stub ‘L3’, and length of rectangular strip ‘W1’ is changed, and the observations are noted.
[0048] The gap ‘g’ plays an important role in the matching of impedance at a higher frequency band. Change of value of g from 0.10mm to 0.30mm observes improvement of impedance and for g=0.20mm, intended operating bandwidth 2.43GHz-2.51GHz (Bluetooth) and 6.88GHz-12.06GHz is achieved. Also, another parameter variation is shown in FIG. 1E refers to the matching of impedance at X-Band, where the value k is changed from 0.50mm to 1.00mm with a step size of 0.25mm. It can be noted that when the gap is small, a narrow bandwidth is obtained and as the gap is increased, better impedance matching is achieved with a wider band of operation. In both the optimization process, the lower Bluetooth band is not affected. As per the proposed design, two multiple bands are generated covering Bluetooth and X-Band, which need to be optimized to work in their allotted bandwidths. In FIG. 1F, the effective anchor-shaped stub 108 length is changed from 3.93mm to 4.43mm, which changes the center resonating frequency from 2.49GHz to 2.47GHz. For the value of L3=4.18mm, the required Bluetooth band is obtained. Similarly, for higher X-Band, the change of W1 from 7.00mm to 8.00mm is shown in FIG. 1G, not only observes the improvement of bandwidth but also shifting of bandwidth from higher to lower side. Hence the optimized values corresponding to g=0.20mm, k=1.00, L3=4.18mm, and W1=8.00mm achieve the objectives for which the multi-band antenna is designed for Bluetooth and X-Band applications.
[0049] The embodiments of the present disclosure described above provide several advantages. The one or more of the embodiments provide the antenna device 100 that supports Bluetooth and X-Band applications. The antenna device 100 can be fabricated easily at a low cost and can achieve enhanced impedance bandwidth. The present disclosure provides compact antenna device 100. The present disclosure provides excellent radiation patterns in both principle planes were effectively achieved in the design leading to dipole-like and omnidirectional patterns for both bands with very low cross-polarization in corresponding orthogonal planes. Further, the antenna device 100 maintains stable realized gain in both the operating bands achieving the objective as a potential candidate for multi-band applications.
[0050] FIG. 2A to FIG. 2C illustrates the surface current density distribution and study of equivalent circuit model, in accordance with an embodiment of the present disclosure.
[0051] The proposed multi-band antenna 100 is studied by simulating surface current density on patch and ground. FIG. 2A illustrates the distribution of current at center Bluetooth frequency of 2.46GHz which suggests that the resonance is obtained due to the maximum concentration of current within anchor-shaped stub 108 attached to the ground. FIG. 2B depicts simulation for current density is carried out for 10GHz which lies within the X-Band. Maximum surface current is observed within the feed and attached rectangular strip providing wider impedance bandwidth for X-Band applications. Also, to understand the matching of impedance for both the operating bands, the real and imaginary impedance curve is plotted as shown in FIG. 2C. As per the observations, it can be concluded that real and imaginary grazes matched 50? and 0? values for the entire Bluetooth and X-Band. This also suggests that at matched impedance values for these two operating bands, the maximum surface current is observed for both stubs responsible for generating two different operating bands.
[0052] FIG.3A illustrates an exemplary prototype of the antenna device, in accordance with an embodiment of the present disclosure. Simulated results obtained are verified with measured results by developing a prototype shown in FIG.3A
[0053] FIG.3B illustrates comparison of simulated and measured results, in accordance with an embodiment of the present disclosure. FIG.3B depicts the comparison of both simulated as well as measured results which are tabulated in Table 2. As per the observations in comparison of Table 2, there is good agreement between both Bluetooth and X-Band applications. Also, it can be concluded that the actual bandwidth required for both the applications is achieved in both simulated as well as measured results.
Bluetooth X-Band
Bandwidth
(GHz) Maximum RL (dB) at Resonance (GHz) Bandwidth
(GHz) Maximum RL (dB) at Resonance (GHz)
Simulated 2.440-2.530 -13.28 at 2.49 6.89-12.13 -20.960 at 8.02
-23.573 at 10.35
Measured 2.404-2.470 -14.63 at 2.44 6.89-11.35 -21.730 at 7.44
-16.890 at 10.52
Table 2: Comparison of Simulated and Measured Results
[0054] FIG.4A illustrates a far-field results for the designed multiband antenna and comparison of simulated and measured gain of the, in accordance with an embodiment of the present disclosure. As illustrated in FIG.4A, both simulated as well as measured results are compared for Gain (dBi) and 2-D radiation patterns in both principal planes (E- and H-plane) with cross-polarization in their respective perpendicular planes. Variation of gain in Bluetooth band for simulated is between 4.89dBi-5.09dBi and for measured results this range is between 4.27dBi-5.24dBi with a maximum measured gain of 5.24dBi at 2.46GHz. Similarly, for X-Band, gain in simulation environment ranges between 5.46dBi-5.239dBi whereas, for measured results, these values are 4.896dBi-5.442dBi with a maximum gain of 5.442dBi at 10.90GHz.
[0055] FIG. 4B illustrates simulated and measured 2-D radiation patterns at Bluetooth, in accordance with an embodiment of the present disclosure.
[0056] FIG. 4C illustrates simulated and measured 2-D radiation patterns at X-Band, in accordance with an embodiment of the present disclosure. FIG. 4B to FIG. 4C compares the 2-D radiation patterns for simulated and measured in both principal planes (Electric and Magnetic fields). Comparison of radiation patterns are carried out for both proposed bands of Bluetooth (Simulated: 2.435GHz, Measured: 2.440GHz) and X-Band (Simulated and Measured at 10.00GHz). As per the expectations of monopole radiation patterns leading to dipoles like pattern and omnidirectional pattern in E- and H-field, both the results do justify the expected radiation patterns with acceptable cross-polarization in their respective perpendicular planes. This suggests that the proposed prototype is well served the proposed objective of multiband antenna for dual-band of operation.
[0057] The proposed dual-band antenna is fabricated and realized on FR4 substrate is also compared with the state-of-the-art designs and is tabulated in Table 3. The proposed antenna is compared with size, number of bands, the substrate used in the design, bandwidth covered, maximum gain in all bands, radiation pattern, and potential applications. The comparative table reveals that the proposed design is capable of working in both narrow and wideband applications designed for Bluetooth and X-Band. Also, from the comparison, it can be concluded that the antenna may occupy very less area when integrated with PCB for potential applications. Also, the antenna not only maintains good radiation patterns in operating bands but also provides a maximum gain of 5.442 dBi.
Ref. No. Physical Size
(mm2) No. of Operating Bands Substrate
Specifications
(er, tand) Bandwidth
(GHz) Maximum Gain (dBi) Comments on 2-D Radiation Patterns Potential Application Bands
Dual-Band Linearly Polarized Integrated Dielectric Resonator Antenna for Wi-MAX Applications 45×50 2 Alumina
9.8, 0.02 2.9-3.6
5.2-5.6 5.01 Directional WiMAX
Design of a Multiband Hexagonal Patch Antenna for Wireless Communication Systems 30×35 3 FR4
4.30, 0.0088 2.35-2.43
4.98-5.10
8.57-8.79 2.95 Directional at lower band and omnidirectional at the remaining band S-Band
C-Band
X-Band
A Wide Multi-band Monopole Antenna for GSM/WiMAX/WLAN/X-Band/Ku-Band Application 30×50 5 FR4
4.40, 0.025 1.42-2.08
3.49-4.03
5.23-7.53
8.00-9.87
10.70-20.0 6.50 Poor radiation patterns GSM800
WiMAX/WLAN
X/Ku Band
Miniaturized Single-Feed Multiband Patch Antennas 40×40 4 F4B
2.55, 0.002 - 2.39 Stable radiation pattern WiMAX
WLAN
A new compact and miniaturized multiband uniplanar CPW-fed Monopole antenna with T-slot inverted for multiple wireless applications 25×25 3 FR4
4.40, 0.02 2.4-2.9
3.7-5.2
5.7-6.0 - Stable radiation pattern ISM
WiMAX/WLAN
RFID
Design, simulation and measurement of triple band annular ring microstrip antenna based on shape of crescent moon 31×35 3 FR4
3.55, 0.0027 11.112-11.589
17.748-18.368
20.405-21.215 - Directional X
Ku and K Band
Tripple-Band Microstrip Antenna for Wireless Application 29×37 3 FR4
4.40, 0.02 2.36-2.48
3.16-3.69
5.01-6.00 5.61 Poor radiation patterns Bluetooth
WiMAX/WLAN
A dual band star-shaped fractal slot antenna: Design and measurement 100×112 2 FR4
4.40, 0.02 1.3313GHz
2.6997GHz 1.058 Directional L-Band
S-Band
A Flexible Multiband Antenna for Biomedical Telemetry 25×35 2 Biocompatible
substrate 0.824-0.975
1.90-6.00 -5.00 Directional Biomedical
Telemetry
Fork-shaped planar antenna for Bluetooth, WLAN, and WiMAX applications 24×35 2 FR4
4.40, 0.02 2.26-2.67
3.00-6.78 - Deteriorated radiation pattern at the higher band Bluetooth
WiMAX/WLAN
Design of a Symmetric CPW-Fed Patch Antenna for WLAN/WIMAX Applications Using ANN 24×33.5 2 FR4
4.30, 0.02 2.17-2.56
2.82-6.49 3.36 Very high cross-polarization at all bands WiMAX
WLAN

*P 18×20 2 FR4
4.40, 0.02 2.404-2.470
6.89-11.35 5.442 Good dipole and omnidirectional pattern at all bands Bluetooth
X Band
*P Proposed Antenna
[0058] The present disclosure relates to dual multiband antenna for Bluetooth and X-Band applications. The proposed design fabricated on FR4 substrate for validation and good agreement between simulation and measured results were recorded. Excellent radiation patterns in both principle planes were effectively achieved in the design leading to dipole-like and omnidirectional patterns for both bands with very low cross-polarization in corresponding orthogonal planes. The antenna also maintains stable realized gain in both the operating bands achieving the objective as a potential candidate for multiband applications.
[0059] It will be apparent to those skilled in the art that the antenna device 100 of the disclosure may be provided using some or all of the mentioned features and components without departing from the scope of the present disclosure. While various embodiments of the present disclosure have been illustrated and described herein, it will be clear that the disclosure is not limited to these embodiments only. Numerous modifications, changes, variations, substitutions, and equivalents will be apparent to those skilled in the art, without departing from the scope of the disclosure, as described in the claims.

ADVANTAGES OF THE PRESENT DISCLOSURE
[0060] The present disclosure provides an antenna device that supports Bluetooth and X-Band applications.
[0061] The present disclosure provides an antenna device that can be fabricated easily at low cost.
[0062] The present disclosure provides an antenna device that achieves enhanced impedance bandwidth.
[0063] The present disclosure provides a compact antenna device.
[0064] The present disclosure provides excellent radiation patterns in both principle planes were effectively achieved in the design leading to dipole-like and omnidirectional patterns for both bands with very low cross-polarization in corresponding orthogonal planes.
[0065] The present disclosure provides an antenna device that maintains stable realized gain in both the operating bands achieving the objective as a potential candidate for multiband applications.

We Claims:

1. An antenna device (100) for wireless communication, the device comprising:
a radiating patch (102) configured on a substrate, the radiating patch comprising:
a rectangular slotted ground;
a rectangular stub (104) coupled to a feed line, the feed line is integrated with a cable connector to receive an input signal;
a T-shape stub (106) is formed on the substrate by merging the feed line and the rectangular stub; and
an anchor-shaped stub (108) is embedded on the rectangular slotted ground,
wherein, on receipt of the input signal, the T-shape stub (106) and the anchor-shaped stub (108) generate a plurality of frequency bands for wireless communication.
2. The antenna device as claimed in claim 1, wherein the antenna device is a coplanar waveguide (CPW)-fed patch antenna.
3. The antenna device as claimed in claim 1, wherein the plurality of frequency bands comprises any or a combination of Bluetooth and X-Band.
4. The antenna device as claimed in claim 1, wherein the antenna device (100) is fabricated using FR-4 substrate with dielectric permittivity er=4.40 and loss tangent tand=0.02.
5. The antenna device as claimed in claim 1, wherein the T-shaped stub (106), on receipt of input signal, generates X-band.
6. The antenna device as claimed in claim 1, wherein the anchor-shaped stub (108), on receipt of the input signal, generates Bluetooth.
7. The antenna device as claimed in claim 1, wherein a set of parameters of the antenna device is optimized to operate the antenna device at an intended operating bandwidth.
8. The antenna device as claimed in claim 1, wherein the set of parameters comprise any or a combination of gap between feed line and ground, ground and radiating patch, length of anchor-shaped stub and length of the rectangular stub.
9. The antenna device as claimed in claim 1, wherein the cable connector is a Sub-Miniature A (SMA) connector.