DefinePK

Abstract

Defected ground structures are one of the key important structures to attain multiband characteristics in the microstrip antennas. In this paper, spiral shaped defected ground structures are proposed to improve the performance of different passive circuits, including dual, triple and multiband characteristics and to suppress harmonics in the patch antennas. The proposed defected ground structure monopole antenna is resonating at multiband with size reduction to perform LC resonant property in the operating band. By incorporating defected ground structure in the antenna model, additional resonant frequencies are attained due to the abrupt change in the current path of the antenna. The proposed antenna is prototyped on FR4 substrate and measured results are obtained from ZNB Vector Network Analyzer. The simulated results are in good agreement with measured results of the fabricated antenna model.