Designing a high gain planar antenna on the low‐cost FR4 substrate is one of the major challenging tasks for the researchers. The omnidirectional radiation pattern is desired for 360° coverage. Both of these requirements have been addressed in this article. This article presents a dual band printed antenna designed on an FR4 substrate of 1.6 mm thickness. The proposed antenna operates in the ISM band of 2.4 and 5.8 GHz for the application of dual‐band WLAN/WIFI. The proposed antenna consists of a circular patch and ring‐shaped ground plane. The overall dimension of the antenna is 66 × 66 × 1.6 mm3. Excellent impedance matching and radiation efficiency for both the bands have been achieved. The proposed antenna shows omnidirectional radiation pattern at 2.4 GHz ISM band and nearly omnidirectional pattern along with high gain of 4.7 dBi at 5.8 GHz ISM band.
Simulated and experimental investigations on a compact, single layer and single probe fed circular Microstrip patch antenna with multi-frequency operation are presented in this paper. This novel design is achieved by cutting four rectangular slots at ground plane of Microstrip patch antenna. Generally Microstrip antenna exhibits narrow bandwidth and single or dual frequency operations. After modifications researchers have been able to design the antenna to have broad band, compactness or multi frequency operation or any one of them. However in this paper two characteristics have been achieved simultaneously. One is compactness and other is multi frequency operation. Compared to the conventional circular patch antenna the proposed antenna can achieve 94% size reduction. Septa frequency operation has also been achieved effectively by adjusting the number of circular ring, their size and feed position. Simulated investigations are done by Ansoft Designer software based on method of moment. Measurement is done using standard microwave test bench.
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