Tunable dipole antennas

Author

Roscoe, D.J. ; Shafai, L. ; Ittipiboon, A. ; Cuhaci, M. ; Douville, R.

Author_Institution

Communications Res. Centre, Ottawa, Ont., Canada

fYear

1993

fDate

June 28 1993-July 2 1993

Firstpage

672

Abstract

The concept of extending the operating bandwidth of a dipole has been investigated, and two bandwidth extension approaches were studied. The first approach involves the use of parasitic elements to physically change the length of the dipole. The second approach involves capacitively loading a dipole via varactor diodes to produce a travelling-wave dipole. Results are reported for the parasitic approach, which produces a broadband or multifrequency structure. The multifrequency antenna is controlled by an applied bias voltage. Simulations of the antenna showed the relationship between the diode junction capacitance and the isolation between the active and nonactive regions of the dipole.<>

Keywords

capacitance; dipole antennas; microwave antennas; tuning; varactors; bandwidth extension; bias voltage; capacitive loading; diode junction capacitance; dipole antennas; isolation; multifrequency antenna; parasitic elements; travelling-wave dipole; varactor diodes; Bandwidth; Capacitance; Circuits; Current distribution; Diodes; Dipole antennas; Frequency; Impedance; Microstrip; Optical amplifiers;

fLanguage

English

Publisher

ieee

Conference_Titel

Antennas and Propagation Society International Symposium, 1993. AP-S. Digest

Conference_Location

Ann Arbor, MI, USA

Print_ISBN

0-7803-1246-5

Type

conf

DOI

10.1109/APS.1993.385257

Filename

385257