A Novel Radiation Pattern and Frequency Reconfigurable Single-Armed Spiral Microstrip Antenna Design

In this paper, a novel design of a reconfigurable printed spiral antenna is presented. To achieve both pattern and frequency reconfiguration, pin diode switches are integrated within the radiating antenna surface. CST and ADS simulation softwares are used to design and analyse the antenna structure and performances. simulation results are presented and compared. The proposed antenna is able to configure operating frequencies in the frequency range of 1-6GHz and provides a beam switching in the elevation plane between −44° and +44°. Circular polarization characteristic is inspected; the axial ratio remains within an acceptable limit for the majority of the switching cases. The gain, which is approximately 8.5dB, stays relatively constant within ±0.5 dB variation.