Title :
A broadband microstrip patch antenna fed through vias connected to a 3dB quadrature branch line coupler for worldwide UHF RFID reader applications
Author :
Mireles, Elias ; Sharma, Satish K.
Author_Institution :
Dept. of Electr. & Comput. Eng., San Diego State Univ., San Diego, CA, USA
Abstract :
This paper presents the design of a circularly polarized Radio Frequency Identification (RFID) reader antenna for worldwide Ultra High Frequency (UHF) (860-960 MHz) applications. The proposed antenna, which consists of a microstrip patch with truncated corners and a cross slot, is suspended over a ground plane and fed through vias that extend from the quadrature 3 dB branch line coupler placed below the ground plane. This antenna has a total size of 225 × 250 × 12.8 mm3 and shows a measured matching band of 840-1150MHz (31.2%) and 3 dB axial ratio (AR) of 820-1120 MHz (31%).
Keywords :
UHF antennas; antenna feeds; broadband antennas; electromagnetic wave polarisation; microstrip antennas; radiofrequency identification; slot antennas; waveguide couplers; broadband microstrip patch antenna feed; circularly polarized radiofrequency identification reader antenna; frequency 820 MHz to 1150 MHz; quadrature branch line coupler; slot antenna; worldwide UHF RFID reader applications; Antenna measurements; Antenna radiation patterns; Extraterrestrial measurements; Microstrip antennas; Microwave antennas; Radiofrequency identification; Circularly Polarized (CP); Radio Frequency Identification (RFID); Reader Antenna; Worldwide UHF band;
Conference_Titel :
Antennas and Propagation (APSURSI), 2011 IEEE International Symposium on
Conference_Location :
Spokane, WA
Print_ISBN :
978-1-4244-9562-7
DOI :
10.1109/APS.2011.5996762
