Title :
Axial-ratio bandwidth enhancement of asymmetric-CPW-fed circularly-polarised square slot antenna
Author :
Sze, Jia-Yi ; Wang, Jung-Chi ; Chang, Chung-Ching
Author_Institution :
Dept. of Electr. & Electron. Eng., Nat. Defense Univ., Taoyang
Abstract :
A novel broadband circularly-polarised (CP) square slot antenna fed by an asymmetric coplanar waveguide (CPW) from a corner of the slot is proposed. A CP bandwidth larger than 10% can be attained simply by using an inverted-L tuning stub protruded from the signal line of the CPW. With an additional pair of grounded strips implanted in the slot, the 3 dB axial-ratio bandwidth and the VSWR les 2 impedance bandwidth can be greatly raised to be as high as 30 and 35%, respectively.
Keywords :
antenna feeds; coplanar waveguides; electromagnetic wave polarisation; slot antennas; strip lines; asymmetric coplanar waveguide; asymmetric-CPW-fed circularly-polarised square slot antenna; broadband antenna; impedance bandwidth; inverted-L tuning stub;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20081858
