Title :
A Novel Microstrip-CPW Fed Planar Slot Antenna With Broadband and Circular Polarization
Author :
Hai-Gao Xue ; Xue-Xia Yang ; Zhewang Ma
Author_Institution :
Sch. of Commun. & Inf. Eng., Shanghai Univ., Shanghai, China
Abstract :
A novel broadband circularly polarized planar slot antenna with microstrip-CPW fed is proposed in this paper. It consists of a wide rectangular slot and a coplanar waveguide (CPW) feedline, both etched on the ground plane of a dielectric substrate, as well as a microstrip to CPW transition on the reverse plane of the substrate. The microstrip-CPW feed structure is appropriately designed so that the even and odd modes of the CPW are excited with 90° phase difference, and are then fed to the slot antenna to realize wideband circular polarization operation. The mechanism of circular polarization in this design is explained and the detailed parametric study of the antenna is carried out. The measured 3-dB axial-ratio bandwidth is 39.4% (1.98 ~ 2.95 GHz), and -10 dB reflection coefficient bandwidth is 57% (1.73 ~ 3.11 GHz).
Keywords :
UHF antennas; antenna feeds; coplanar waveguides; electromagnetic wave polarisation; microstrip transitions; planar antennas; slot antennas; axial-ratio bandwidth; broadband circularly-polarized planar slot antenna; coplanar waveguide feedline; dielectric substrate ground plane; frequency 1.73 GHz to 3.11 GHz; microstrip-CPW fed planar slot antenna; microstrip-CPW transition; rectangular slot; reflection coefficient bandwidth; wideband circular polarization operation; Antenna measurements; Bandwidth; Broadband antennas; Coplanar waveguides; Microstrip; Microstrip antennas; Reflection coefficient; Broadband; circular polarization; coplanar waveguide (CPW); slot antenna;
Journal_Title :
Antennas and Wireless Propagation Letters, IEEE
DOI :
10.1109/LAWP.2015.2407904
