Circularly Polarized Square Slot Antenna With a Largely Enhanced Axial-Ratio Bandwidth
- 22 August 2012
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Antennas and Wireless Propagation Letters
- Vol. 11, 969-972
- https://doi.org/10.1109/lawp.2012.2213568
Abstract
A new easy-to-apply design procedure is proposed in this letter for constructing small wideband circularly polarized (CP) bidirectional and unidirectional square slot antennas. With an asymmetric T-shaped strip protruded from the signal line of the feeding coplanar waveguide (CPW) into the square slot, a reference antenna with a fractional 3-dB axial-ratio bandwidth (abbreviated as CPBW) of about 11% can be obtained. The proposed bidirectional CP slot antenna (BICPSA) can be modified from the reference antenna by stretching the left end of the T-shaped strip upward, by embedding a rectangular metal patch in the square slot, and by implanting a grounded metal strip from the right edge of the slot. The resulting BICPSA has a much larger CPBW of 39.1%, which is about 3.55 times that of the reference antenna. Finally, by placing a simple reflector underneath this BICPSA without changing its structural dimensions, one can obtain unidirectional radiation patterns with a greatly increased gain of 7.6 dBic, but with only a slightly decreased CPBW of 34.3%.Keywords
This publication has 10 references indexed in Scilit:
- Axial-Ratio-Bandwidth Enhancement of a Microstrip-Line-Fed Circularly Polarized Annular-Ring Slot AntennaIEEE Transactions on Antennas and Propagation, 2011
- Broadband CPW-Fed Circularly Polarized Square Slot Antenna With Three Inverted-L-Shape Grounded StripsIEEE Antennas and Wireless Propagation Letters, 2011
- DESIGN OF BROADBAND CIRCULARLY POLARIZED SQUARE SLOT ANTENNA WITH A COMPACT SIZEProgress In Electromagnetics Research, 2011
- CPW-FED SQUARE SLOT ANTENNA WITH LIGHTENING-SHAPED FEEDLINE FOR BROADBAND CIRCULARLY POLARIZED RADIATIONProgress In Electromagnetics Research Letters, 2010
- Broadband CPW-Fed Circularly Polarized Square Slot Antenna With Lightening-Shaped Feedline and Inverted-L Grounded StripsIEEE Transactions on Antennas and Propagation, 2009
- A CPW-fed broadband circularly polarized square slot antennaMicrowave and Optical Technology Letters, 2009
- Circularly-Polarized Wide Slot Antenna Loaded With a Parasitic PatchIEEE Transactions on Antennas and Propagation, 2008
- Circularly Polarized Square Slot Antenna With a Pair of Inverted-L Grounded StripsIEEE Antennas and Wireless Propagation Letters, 2008
- Microstrip‐fed circular slot antenna for circular polarizationMicrowave and Optical Technology Letters, 2008
- Axial-ratio bandwidth enhancement of asymmetric-CPW-fed circularly-polarised square slot antennaElectronics Letters, 2008