Design of compact pentagonal slot antenna with bandwidth enhancement for multiband wireless applications

The compact design of a microstrip feed pentagonal shaped slot antenna with electromagnetically coupled pentagon parasitic patch is proposed in this paper for bandwidth enhancement. An aligned self-similarity pentagonal shaped structures, for slot and parasitic patch, at its vertex are used to broaden the bandwidth. The proposed antenna gives a wide bandwidth of 4.17 GHz (3.281–7.45 GHz), which corresponds to FRB 77.72%. The rotational behaviour of slot antenna illustrates good impedance matching over the wide bandwidth. Over the entire operating bandwidth, the antenna gain remains constant about 4.24 dBi and group delay is less than 0.5 ns. The simulated and measured results show its use in wireless applications.