HF Antenna Switch

PDF

Authors
  1. Tunaley, J.K.E.
Corporate Authors
Defence Research Establishment Ottawa, Ottawa ONT (CAN);London Research and Development Corp, London ONT (CAN)
Abstract
In the setup and testing of High-Frequency (HF) radars, it is often necessary to have a target of known cross section. Separating the target reflection from low-Doppler-shift clutter is usually difficult, so a useful target will have an oscillating cross section. This is most easily done by placing a switch between components of the target so the target cross section is high when the switch is closed and low when it is open. This report describes the construction of an all-solid-state switch which performs the switching function for radio frequencies in the range 1-27 MHz. The switch is based on an 2N7000 MOSFET transistor, and can run for about 10 hours on 2 9-V transistor batteries. Across the 1.27 MHz range, its open-state impedance is >470 Ohms while the closed-state impedance is <5 Ohms. The report also discusses alternate approaches to design of switches HF radar targets, and also makes calculations of target cross sections when the switch is placed at the centre of a resonant dipole.
Keywords
HF switch
Report Number
DREO-CR-1999-124 — Contractor's Report
Date of publication
01 Sep 1999
Number of Pages
34
DSTKIM No
CA000252
CANDIS No
512191
Format(s):
Hardcopy;Document Image stored on Optical Disk

Permanent link

Document 1 of 1

Date modified: