Circularly Polarized Antennas

Chapter 6

Case Studies

6.1 Introduction

In previous chapters, different techniques for designing CP antenna elements and arrays have been presented. This chapter aims to provide step-by-step guidance to readers who would like to get started on CP antenna and array design. Design procedures of some different types of CP elements and arrays are described in detail. It is expected that readers will be able to follow the design steps as given in the case studies.

Five case studies; one dual band CP array for GPS application (1.575 GHz and 1.227 GHz), one small PQHA for SATCOM (2 GHz), one broadband CP antenna for RFID reader (2.4 GHz), one CP reflectarray for Ka band (30 GHz) application and one wideband logarithmic spiral antenna that can operate from 3.4–7.7 GHz, will be presented. The design guidelines for these CP antennas will be given and detailed results are presented.

6.2 Dual-Band CP Patch Array for GNSS Reflectometry Receiver on Board Small Satellites

The Global Navigation Satellite System (GNSS) is a system of satellites that provides autonomous geo-spatial positioning with global coverage. Receivers can determine their location precisely by calculating the time signals received from GNSS satellites. Although the major market for GNSS remains with guidance and navigation users at the moment, GNSS remote sensing has become increasingly important for the scientific and research community due to the availability of GNSS signals for studying climate changes, ocean roughness ...