Transcription of Understanding Circular Waveguide—Experimentally
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Understanding Circular Waveguide—Experimentally
Jan/Feb 2001 37 Old-fashioned microwave Paul Wade, W1 GHZ161 Center RdShirley, MA CircularWaveguide Experimentally1 Notes appear on page is an excellent mi-crowave transmission line,with low loss and predictableperformance, usable at any frequencyby choosing the proper dimensions. Themost common type of commercial wave-guide is precision rectangular tubing,which is only affordable on the surplusmarket. Elliptical waveguide is alsoused commercially for microwavetransmission line. Many microwavestructures, particularly antennas, havea round cross section and are bettersuited to Circular (cylindrical) wave-guide. Unfortunately, commercial cir-cular waveguide is rare and unlikely tobe found surplus. As luck would have it,ordinary copper water pipe works justfine and is universally available at lowcost. In particular, 3/4-inch copper pipeis perfect for 10 microwave design today is donewith the aid of computers. However,only a few programs handle electro-magnetics with the capabilities re-quired for Circular waveguide , and theirprices are somewhere between a fancycar and a new house.
Jan/Feb 2001 37 Old-fashioned microwave engineering. By Paul Wade, W1GHZ 161 Center Rd Shirley, MA 01414 w1ghz@arrl.net Understanding Circular Waveguide—Experimentally
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