Title :
A single layer dual band circularly polarized microstrip antenna for GPS applications
Author :
Yang, Fan ; Rahmat-Samii, Yahya
Author_Institution :
Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA
Abstract :
Most current GPS receivers only use the L1 frequency of 1.575 GHz with right hand circular polarization. However, in some applications that need more accurate information, differential GPS is employed and an antenna is required to cover both L1 and L2 (1.227 GHz) bands with CP patterns. Recently, we proposed a square patch antenna with switchable slots for dual band CP operation (see Yang, F. and Rahmat-Samii, Y., Electronics Lett., vol.37, p.1002-3, 2001). It has attractive features of a single layer, a single feed, and small frequency ratio. Hence, such an antenna is proposed for GPS applications. The antenna structure and its design procedure are detailed.
Keywords :
Global Positioning System; UHF antennas; antenna radiation patterns; electromagnetic wave polarisation; finite difference time-domain analysis; microstrip antennas; multifrequency antennas; slot antennas; 1.227 GHz; 1.575 GHz; FDTD method; antenna patterns; circularly polarized antenna; differential GPS; dual band antenna; frequency ratio; low elevation gain; single feed; single layer microstrip antenna; size reduction; square patch antenna; switchable slots; Dual band; Feeds; Frequency; Global Positioning System; Microstrip antennas; Patch antennas; Polarization; Probes; Slot antennas; Switches;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2002. IEEE
Print_ISBN :
0-7803-7330-8
DOI :
10.1109/APS.2002.1017084
