Broadband Response of Planar Four-Edge Gap-Coupled Rectangular Patches of Unequal Length Variation

The paper discusses the multiresonator technique in a planar configuration, elaborating on the mechanism of gap coupling for broad BWs in rectangular microstrip patches. The centre frequency of the microstrip antenna operates at 2.96 GHz leading to compactness and it has an impedance bandwidth of 339 MHz (11.48%) with VSWR < 2. A very high BW is obtained at a low centre frequency without increasing the height of the substrate