Title :
Practical design of single feed truncated corner microstrip antenna
Author :
Niroojazi, M. ; Azarmanesh, M.N.
Author_Institution :
Dept. of Electr. Eng., Urmia, Iran
Abstract :
Two samples of direct fed circularly polarized (CP) microstrip antennas at 2.45 GHz printed on different substrates with high and low loss tangent are reported. A stub is used in the feed network to make the frequency with minimum return loss, fr (resonant frequency), equal to the frequency with minimum axial ratio, fcp (circular polarization frequency). The effect of losses on the return loss, resonant frequency and their bandwidth are examined. Experimental results of antennas showed the impedance bandwidth (2:1 VSWR) about 49 MHz and 37 MHz for FR4 and RT/Duroid substrates, respectively. Axial ratios of 0.5 dB for the low loss antenna and 2.5 dB for the high loss antenna are obtained.
Keywords :
UHF antennas; antenna feeds; antenna radiation patterns; dielectric losses; electric impedance; electromagnetic wave polarisation; microstrip antennas; 2.45 GHz; VSWR; circular polarization frequency; circularly polarized antennas; feed network; impedance bandwidth; loss tangent; minimum axial ratio; minimum return loss; radiation pattern; resonant frequency; single feed truncated corner microstrip antenna; stub; Antenna feeds; Availability; Bandwidth; Fabrication; Impedance; Microstrip antennas; Patch antennas; Polarization; Printed circuits; Resonant frequency;
Conference_Titel :
Communication Networks and Services Research, 2004. Proceedings. Second Annual Conference on
Print_ISBN :
0-7695-2096-0
DOI :
10.1109/DNSR.2004.1344707
