A Varactor-Tunable High Impedance Surface With a Resistive-Lumped-Element Biasing Grid

Author

Mias, Christos ; Yap, Jyh Haur

Author_Institution

Warwick Univ., Coventry

Volume

55

Issue

7

fYear

2007

fDate

7/1/2007 12:00:00 AM

Firstpage

1955

Lastpage

1962

Abstract

A high impedance surface consisting of metallic square patches electrically connected through vias to the ground plane beneath them is made tunable. Tunability is achieved by connecting adjacent patches with varactor diodes thus altering the capacitance between the patches and hence the surface´s resonance frequency. The varactor diodes are biased with the aid of a resistive grid. The grid is made resistive using surface mount resistors. Using an approximate equivalent circuit the effect of the varactor diode resistance is investigated for normal plane wave incidence. It is shown that at resonance, a small varactor resistance may lead to a significant absorption. The potential use of a waveguide simulator to characterize approximately the performance of the proposed metamaterial structure is investigated.

Keywords

electric resistance; electrical resistivity; equivalent circuits; metamaterials; surface mount technology; varactors; waveguides; equivalent circuit; metamaterial structure; resistive-lumped-element biasing grid; resonance frequency; surface mount resistor; tunability; varactor diodes; varactor resistance; varactor-tunable high impedance surface; waveguide simulator; Capacitance; Diodes; Joining processes; Resistors; Resonance; Resonant frequency; Surface impedance; Surface resistance; Tunable circuits and devices; Varactors; Absorber; high impedance surface (HIS); metamaterial structure; tunable; waveguide simulator;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/TAP.2007.900228

Filename

4267917