Design and EM-driven Optimization Of A Compact Low Profile Circularly Polarized Wide-slot CPW-fed Antenna For Broadband Applications

摘要

The paper presents design and optimization procedure of a compact circularly-polarized antenna for broadband applications. The major design challenge is a large number of geometry parameters (>20) which have to be simultaneously adjusted in order to achieve the best possible antenna performance. At the same time, several performance figures have to be handled, including bandwidth, reflection characteristic, and axial ratio (AR). As straightforward optimization involving all parameters and specifications fails in this case, a multi-stage optimization procedure is implemented that switches between design objectives and gradually increases the number of geometry parameters to be tuned. As a result, a compact structure of only 25 mm × 25 mm is achieved featuring- 10 dB bandwidth of 44% and 3dB AR bandwidth of 35%. The structure is favorably compared to competitive designs reported in the literature.