DocumentCode :
444853
Title :
Notched circular microstrip patch antennas with bow tie shaped aperture coupling for improved axial ratio bandwidth
Author :
Sharma, Ajay Kumar ; Mittal, Ashok
Author_Institution :
Central Res. Lab., Bharat Electron. Ltd., Ghaziabad, India
Volume :
2A
fYear :
2005
fDate :
3-8 July 2005
Firstpage :
271
Abstract :
This paper presents improvement in the axial ratio bandwidth obtained with notched circular microstrip patch antennas. The antenna is electro-magnetically fed with bow tie shaped apertures as compared to a full circular microstrip patch of the same configuration. The simulation has been carried out using a method of moments based computer aided design tool. A near to 1:1 ellipticity to impedance bandwidth has been obtained in simulation with the above configuration. It is observed that by cutting electrically small rectangular notches (Wη0/25 and Lη0/20) into the circular patch parallel to the current lines significantly improves the ellipticity bandwidth without changing its impedance bandwidth. The current distribution of the notched patch remains unaltered and hence the radiation pattern is also not affected. This has been verified from the simulated results. In simulation 2:1 impedance bandwidth of 34% and 3 dB axial ratio bandwidth of 33% has been achieved with the above geometry. An improvement of 6% in ellipticity bandwidth is obtained over a full circular patch antenna of same configuration. The use of dielectric foam makes the antenna light weight and low cost. The above features make it an ideal element for wide band applications as required for personal, mobile satellite and wireless communication systems.
Keywords :
antenna theory; aperture-coupled antennas; bow-tie antennas; broadband antennas; electric impedance; electromagnetic wave polarisation; electronic design automation; method of moments; microstrip antennas; mobile antennas; satellite antennas; axial ratio bandwidth; bow tie shaped aperture coupling; circular microstrip patch configuration; dielectric foam; electrically small rectangular notches; electro-magnetically fed antenna; ellipticity bandwidth; impedance bandwidth; lightweight antenna; method of moments based computer aided design tool; mobile satellite communication systems; notched circular microstrip patch antennas; notched patch current distribution; personal communication systems; radiation pattern; simulation; wide band applications; wireless communication systems; Aperture antennas; Bandwidth; Computational modeling; Computer simulation; Current distribution; Impedance; Microstrip antennas; Moment methods; Patch antennas; Time of arrival estimation;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Antennas and Propagation Society International Symposium, 2005 IEEE
Print_ISBN :
0-7803-8883-6
Type :
conf
DOI :
10.1109/APS.2005.1551791
Filename :
1551791
Link To Document :
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