In this article, broadband and high gain antennas are designed for bandwidth from 1.7 to 2.5 GHz which covers GSM 1800, 3G, 4G, and Wi‐Fi applications. The antennas are designed using 1 bottom and 2 top patches (1B2T) stacked microstrip antenna configuration and its array. The antenna structures consist of copper metallic plate as the bottom patch and low‐cost FR4 substrate for the top patches in air suspended mode. The antennas are enclosed in a metallic cavity which supports top substrate and increases gain and front‐to‐back ratio. The bandwidth for |S11| ≤ −10 dB and peak gain for this configuration are 41.5% and 11.9 dBi, respectively. A broadband 2 × 2 array of 1B2T configuration is designed using tapered feed network to provide impedance matching for broad bandwidth. The structures are designed, fabricated, and tested. A bandwidth of 44% and peak gain of 16.6 dBi has been achieved using 2 × 2 array. The simulated and measured results are in good agreement. The proposed antennas are good candidates for wireless communication systems.
In this study, a low cost, broadband and high gain multilayer multiresonator microstrip antenna (MSA) is designed. It consists of one metallic fed patch at the bottom layer and two circular patches (1B2 T) are printed on the bottom side of the top FR4 substrate layer, which is air suspended. Two configurations with the bottom patch of circular and elliptical shapes are compared. The elliptical 1B2 T MSA provides better bandwidth (BW), i.e. 53.4% with peak gain of 9.8 dBi. The antenna design parameters are selected to provide maximum BW with uniform gain. The elliptical 1B2 T MSA is further enclosed in a metallic cavity, which improves the BW, gain and front to back (F/B) ratio of the antenna. The elliptical 1B2 T MSA with cavity enclosure is fabricated and tested. Experimental results are in agreement with simulated ones. The elliptical 1B2 T MSA with cavity provides 55.7% BW with peak gain of 12.1 dBi and F/B of >18 dB. The proposed antenna can be used in GPS, 2G, 3G, 4G and Wi‐Fi frequency bands applications.
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