Widebanding techniques for VHF antennas - II
By: by Keem B. Thiem, Ramakrishna Janaswamy
Contributors: Janaswamy, Ramakrishna; Naval Postgraduate School (U.S.). Dept. of Electrical and Computer Engineering
Publisher: Naval Postgraduate School; Available from National Technical Information Service
Published: 1993
Place of publication: Monterey, Calif; Springfield, Va
Language: eng
Number of pages: 133
Subjects: ANTENNAS; PIN DIODES; ELECTRONIC SWITCHING; COMPUTER AIDED DESIGN; ANTENNA CONFIGURATIONS
Other titles: NPS-EC-93-007.
Description: For a variety of mechanical and electrical reasons, the U.S. Army prefers to use a wire      antenna for its mobile applications in the HF and VHF bands. However, due to the rapid      fluctuation of impedance with frequency, a simple wire antenna is not suitable. This research      will look into the aspects of electronic switching of the antenna length and electronic switching      of the accompanying tuning network for frequency hopping applications. Two separate      schemes will be studied. The first one involves a chosen wire antenna loaded with PIN diodes.      The diodes will be selectively switched ON or OFF at different frequencies to control the      input impedance of the antenna. In the second scheme, a monopole antenna of fixed length will      be considered and data on its input impedance over many sub-bands within 30 to 90 MHz      will be generated. Tuning networks composed of resistors, inductors and capacitors will be      designed over each sub-band. The various networks will then be connected via PIN diodes      and selectively switched to provide matching over a much wider band
Notes: Title from cover.

"NPS-EC-93-007."

"March 1993."

AD A263 998.

Includes bibliographical references (p. 133).

aq/aq cc:9116 11/10/97