Design of a Robot Head Shaped Microstrip Patch Antennas for Multi-band Applications

Abstract

In this paper, two different types of robot head shaped patch antennas are proposed and a comparative study is presented. Both the proposed antennas have same dimensions except at the mouth position. These antennas are fed by coaxial feeding technique and are etched on an FR-4 substrate with relative permittivity 4.4. The proposed antennas produce multiple bands resonating at 1. 63 GHz, 5 GHz, 6.13 GHz, 6.91 GHz and 9.5 GHz frequencies with excellent return loss characteristics. These frequencies have applications in wireless, satellite, radar and mobile communications.