Summary
International Symposium on Antennas and Propagation
2006
Session Number:2A2a
Session:
Number:2A2a-1
Experimental Study of Sleeve Antennas Using Variable Capacitors
Kengo Nishimoto, Ryosuke Umeno, Nobuyasu Takemura, Toru Fukasawa, Masataka Ohtsuka, Shigeru Makino,
pp.1-5
Publication Date:2006/11/2
Online ISSN:2188-5079
Summary:
We propose two types of broadband sleeve antennas using variable capacitors. In the sleeve antenna, CRB(Current Rejection Band: the band within which the leakage current on the feeder is suppressed) becomes wider with an increase in the antenna width. Therefore, when the broadband characteristic is required, the sleeve antenna becomes large. In the proposed antennas, CRB can be adjusted by changing the capacitances of the variable capacitors. We show these characteristics by experiments, and broadband impedance adjustments are achieved. The radiation patterns of the proposed antennas almost correspond to that of a half-wavelength dipole antenna.