Broadband Modified Proximity Coupled Patch Antenna with Cavity-Backed Configuration

A modified proximity-coupled microstrip patch antenna with broad impedance bandwidth is proposed by incorporating proximitycoupled patch antenna into the rectangular open-ended microstrip feed line on a cavity structure. First we design a proximity-coupledmicrostrip antenna to have a wide bandwidth in the lower band centered at 7 GHz using a cavity-backed ground. To broaden the bandwidthof the antenna to the upper band, we then apply a rectangular open-ended microstrip feed line, adjusting the relative position to thecavity to generate an additional resonance close to 10 GHz. The combination of lower and upper band design results in a broadband antennawith dimensions of 30 mm X 30 mm X 9 mm (0.9λ₀ X 0.9λ₀ X 0.27λ₀) is designed where λ₀ corresponds to the free space wavelengthat a center frequency of 9 GHz. The measurement results verify the broad impedance bandwidth (VSWR ≤ 2) of the antenna at77% (5.6-12.6 GHz) while the broadside gain is maintained between 6 dBi and 8 dBi within the operational broad bandwidth.