Deformed bow-tie antenna
Torbjörn Olsson, Andrei Koptioug, Peter Jonsson, Johan Sidén. Mikael Gulliksson
Antenn 03. Nordic Antenna Symposium, 13-15 May 2003 , Kalmar, Sweden
1st January 0001
Antennas in some military applications can be expected to suffer from physical damage of the antenna structure itself. Examples are intelligent munitions when rammed into the gun barrel and vehicle mounted conformal antennas harmed by various types of mechanical impact. Another example is extremely low cost antenna applications. A Radio Frequency IDentification (RFID) system consists of a more or less advanced reader and a very simple tag that can be fastened onto a variety of surfaces. The tag incorporates a transceiver and can carry one or more sensing devices and report findings back to the reader. To keep costs down, low-cost standardized antennas will be used even when the tag is deployed in harsh environments.
For the kind of antennas described above, a predictable graceful degradation of performance is appealing. A partial damage of the antenna must not lead to a system breakdown. An essential part of the antenna design must be to ensure robust communication even when the antenna is partially damaged.
What performance can be expected from an antenna when part of its structure has been removed? In this paper this issue is examined for a bow-tie antenna when part of its structure has been removed. The structural deformation has been inflicted by removing stripes of the outer part of one of the antenna arms.
The investigation was undertaken by simulations in a commercial Finite Integration (FI) program and by verifying measurements.
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