Abstract
Described in this paper is a method for precision SWR measurement in rectangular waveguides. This method uses a magic T as a measuring circuit instead of a slotted line and gets both the maximum and minimum values of a standing weve by tuning a sliding short plunger connected to one of the main arm of the magic T. The principle and method for adjustment of the measuring circuit for precision measurement are given. Errors due to such reasons as non-ideal property of a magic T, loss of a sliding short and incomplete adjustment of a measuring circuit are analyzed, and the error is proved to be below 0.1% for VSWR=1, 50 by using a X band magic T and a sliding short on the free market.
