Analysis and experimental verification of multi-band thin monopole antennas loaded with half-mode CRLH-inspired resonators

Abstract

This paper presents analysis and experimental measurements of CPW and microstrip compact monopole antennas loaded with resonator circuits inspired from simplified half mode composite right / left handed unit cell. The antennas were designed to have a typical omnidirectional radiation pattern. The CPW fed dual band antenna resonats at 2.4 GHz and 5.8 GHz, respectively. The antenna size is 20×30 mm 2 and the radiator patch is only 25% at 2.4 GHz and 60% 5.8 GHz in comparison with a conventional patch antenna. The microstrip triple band antenna covers the frequency bands from 2 GHz-2.4 GHz, 5.4 GHz-6 GHz, and 6.8 GHz-8 GHz. The antenna size is 28 x 25 mm 2 which is less than 25% at lower frequency band compared to the size of the conventional patch antenna. Detailed theoretical and full wave analysis are presented and experimental results demonstrate a good agreement between the measured and the simulated. The suggested antennas can be employed for compact size and multiband functionalities in wireless applications. The loading technique can be adapted for more frequency bands.