Title :
Design and performance of small electromagnetically coupled monopole antenna for broadband operation
Author :
Jung, J.H. ; Choo, H. ; Park, I.
Author_Institution :
Dept. of Electr. & Comput. Eng., Ajou Univ., Suwon
fDate :
4/1/2007 12:00:00 AM
Abstract :
An electromagnetically coupled small broadband monopole antenna has been investigated. The antenna structure consists of a circular disk-loaded monopole and a probe with a spiral strip line monopole packed within a small electrical volume. Broad bandwidth can be achieved through electromagnetic coupling between these two monopoles that generate two resonances closely spaced in frequency. The antenna with a circular disk has an electrical size kr of 0.563 and has 430 MHz of impedance bandwidth for VSWR<2 with a centre frequency at 2.185 GHz, which is sime19.7% of a fractional bandwidth. Measured efficiency of the circular disk-loaded antenna is 98% at its centre band region. The gain of the antenna is >1.55 dBi and the antenna has good omni-directional radiation characteristics
Keywords :
UHF antennas; antenna radiation patterns; broadband antennas; electromagnetic coupling; monopole antennas; 2.185 GHz; antenna structure; broadband monopole antenna; circular disk-loaded antenna; circular disk-loaded monopole; electromagnetic coupling; omni-directional radiation characteristics; small electromagnetically coupled monopole antenna; spiral strip line monopole;
Journal_Title :
Microwaves, Antennas & Propagation, IET
DOI :
10.1049/iet-map:20050065
