Title :
Circular polarized aperture coupled patch antennas for an RFID system in the 2.4 GHz ISM band
Author :
Kossel, Marcel ; Benedickter, Hansruedi ; Baechtold, W.
Author_Institution :
Swiss Fed. Inst. of Technol., Zurich
Abstract :
The design of aperture coupled patch (ACP) antennas for an RFID system in the 2.4 GHz ISM using circular polarization modulation is presented. Due to the requirements of the modulation scheme the ACP antennas are circularly polarized with switchable polarization sense. Four ACP antennas are compared according to their impedance and gain bandwidth, axial ratio, and crosspolarization isolation. Among the presented antennas a novel compact ACP antenna is shown that allows replacement of the conventional quadrature hybrid polarizer by λ/4 quarter transmission lines
Keywords :
antenna testing; electromagnetic coupling; electromagnetic wave polarisation; microstrip antennas; microwave antennas; modulation; radio applications; 2.4 GHz; ISM band; RFID system; UHF; axial ratio; circular polarization modulation; circular polarized aperture coupled patch antennas; crosspolarization isolation; gain bandwidth; impedance; microwave tagging system; quadrature hybrid polarizer; quarter wavelength transmission lines; switchable polarization; Antenna feeds; Aperture antennas; Aperture coupled antennas; Electromagnetic wave polarization; Impedance; Microstrip antennas; Microwave antennas; Patch antennas; Slot antennas; Tagging;
Conference_Titel :
Radio and Wireless Conference, 1999. RAWCON 99. 1999 IEEE
Conference_Location :
Denver, CO
Print_ISBN :
0-7803-5454-0
DOI :
10.1109/RAWCON.1999.810973
