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Varactor-Loaded H-Shaped Antenna With Radiation Pattern Control

Iizuka, Hideo, Hall, Peter, Sugiura, Shinya and Sato, Kazuo (2008) Varactor-Loaded H-Shaped Antenna With Radiation Pattern Control IEEE Transactions on Antennas and Propagations, 56, (9), pp. 2833-2840.

Record type: Article


Abstract—A varactor-loaded H-shaped antenna with radiation pattern control is described. The antenna has a varactor in each of the four arms. A cylindrical wire model with four varactors is analyzed by the method of moments. The analysis, using the “FEKO” simulator, shows the figure-of-eight radiation pattern is rotated by 360 degree in the plane of the antenna with variation of capacitances of the four varactors. An optimum set of capacitances is derived, considering the beamwidth, null level of the radiation pattern, and voltage standing wave ratio (VSWR). A prototype antenna implemented on FR4 substrate has dimensions of 60 mm by 200 mm with a line width of 2 mm. The dc voltages were supplied to the four varactors via the antenna arms where slits were inserted. A 110 Ohm feed line and 110 Ohm-to-50 Ohm balun were designed for the minimum VSWR, whilst maintaining good radiation properties. The antenna exhibits rotation of a figure-of-eight radiation pattern with a VSWR less than 2.7, and the maximum gain from -2.9 dBi to 1.4 dBi at 750 MHz.

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Published date: September 2008
Organisations: Electronics & Computer Science


Local EPrints ID: 266625
ISSN: 0018-926X
PURE UUID: 4aea9530-ebd4-4bd1-8249-ec4352d612c3

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Date deposited: 04 Sep 2008 08:48
Last modified: 18 Jul 2017 07:14

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Author: Hideo Iizuka
Author: Peter Hall
Author: Shinya Sugiura
Author: Kazuo Sato

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