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Highly decoupled planar dipoles in an air waveguide backed by a perfect‐magnetic‐conductor plate above the earth

Two planar dipoles inside an air waveguide backed by a perfect‐magnetic‐conducting (PMC) plane are suggested as a highly isolating transmitting‐and‐receiving subsurface continuous‐wave‐radar antenna. Its coupling mechanism is shown to be the contributions of the evanescent lateral wave and the leaky wave. A design finding the optimum frequency and its bandwidth yielding the minimum mutual coupling less than −60 dB is shown. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 33: 303–306, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10302