Tapered microstrip balun for integrating a low noise amplifier with a nonplanar log periodic antenna

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Abstract
This article describes design parameters and test results for a 1–10 GHz microstrip balun with a 240 Ω balanced port and a 50 Ω unbalanced port. The tapered geometry and rf performance are favorable for integrating a low noise amplifier with a nonplanar log periodic antenna developed at the University of California’s radio astronomy lab. The design can be modified for use in cryogenic low noise applications. When the balun is placed in a conducting enclosure, excitation of unwanted transmission modes can be minimized by careful field and impedance matching of balun ports and by inclusion of a resistive vane in proximity to the balun.

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