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

Volume

4

fYear

2002

fDate

2002

Firstpage

720

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Antennas and Propagation Society International Symposium, 2002. IEEE

Print_ISBN

0-7803-7330-8

Type

conf

DOI

10.1109/APS.2002.1017084

Filename

1017084