Varactor-loaded H-shaped antenna with radiation pattern control

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Varactor-loaded H-shaped antenna with radiation pattern control. / Iizuka, H; Hall, Peter; Sugiura, S; Sato, K.

In: IEEE Transactions on Antennas and Propagation, Vol. 56, No. 9, 01.09.2008, p. 2833-2840.

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@article{89c02d0e26214e2ab7cde1bd66a3f73e,
title = "Varactor-loaded H-shaped antenna with radiation pattern control",
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 3601 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 0 feed line and 110 Omega-to-50 Omega 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.",
keywords = "road vehicles, method of moments, active antennas, varactors, UHF antennas",
author = "H Iizuka and Peter Hall and S Sugiura and K Sato",
year = "2008",
month = sep,
day = "1",
doi = "10.1109/TAP.2008.928788",
language = "English",
volume = "56",
pages = "2833--2840",
journal = "IEEE Transactions on Antennas and Propagation",
issn = "0018-926X",
publisher = "IEEE Xplore",
number = "9",

}

RIS

TY - JOUR

T1 - Varactor-loaded H-shaped antenna with radiation pattern control

AU - Iizuka, H

AU - Hall, Peter

AU - Sugiura, S

AU - Sato, K

PY - 2008/9/1

Y1 - 2008/9/1

N2 - 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 3601 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 0 feed line and 110 Omega-to-50 Omega 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.

AB - 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 3601 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 0 feed line and 110 Omega-to-50 Omega 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.

KW - road vehicles

KW - method of moments

KW - active antennas

KW - varactors

KW - UHF antennas

U2 - 10.1109/TAP.2008.928788

DO - 10.1109/TAP.2008.928788

M3 - Article

VL - 56

SP - 2833

EP - 2840

JO - IEEE Transactions on Antennas and Propagation

JF - IEEE Transactions on Antennas and Propagation

SN - 0018-926X

IS - 9

ER -