Title :
A Novel Circularly Polarized Patch Antenna With a Serial Multislot Type of Loading
Author :
Chang, Nan ; Lin, Jyun Ming
Author_Institution :
Tatung Univ., Taipei
Abstract :
A compact circularly polarized patch antenna excited by an open circular ring microstrip line through multiple slots is investigated. The lengths of the slots were chosen equal to the diameter of the ring. It was observed that circular polarization (CP) performance and input impedance bandwidth can be improved with the number of slots. A radio frequency identification reader (RFID) antenna with 36 slots and operating at 902-928 MHz was designed and tested. Measured impedance bandwidth of 75 MHz (18%) and 3 dB axial ratio bandwidth of 28 MHz (3%) for the antenna are observed.
Keywords :
HF antennas; UHF antennas; VHF antennas; electromagnetic wave polarisation; microstrip antennas; microstrip lines; radiofrequency identification; slot antennas; RFID antenna; bandwidth 28 MHz; bandwidth 75 MHz; circular polarization; frequency 902 MHz to 928 MHz; impedance bandwidth; open circular ring microstrip line; patch antenna; radio frequency identification reader; serial multislot type loading; Bandwidth; Copper; Impedance; Microstrip antennas; Optical polarization; Patch antennas; Radiofrequency identification; Resonant frequency; Shape; Slot antennas; Circularly polarized; patch; ring; series feeding;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
DOI :
10.1109/TAP.2007.908846
