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A single-layer single-feed wideband omnidirectional microstrip antenna with rotating square patches is investigated in this paper. To obtain wide impedance band, the proximity-fed structure is introduced to the antenna to generate dual resonating modes. Two square patches with rotating angle of 90 degrees are used as the main radiator to improve the omnidirectional feature of the radiation pattern. For verifying the design, an antenna prototype with wide operation bandwidth is designed, simulated, fabricated, and measured. The results indicate that the impedance bandwidth (|S11| < −10 dB) as high as 48.6% (3.02–4.96 GHz) is obtained. Meanwhile, the height of the antenna is only 0.11λ0 (λ0 is the free space wavelength corresponding to the lowest frequency). Moreover, omnidirectional radiation pattern is obtained over the operation band. The advantages of wideband, low-profile and simple feed structure make the antenna a good candidate in modern communication systems.

SINGLE-LAYER SINGLE-FEED WIDEBAND OMNIDIRECTIONAL MICROSTRIP ANTENNA WITH ROTATING SQUARE PATCHES