Abstract
A new planar microstrip balun with two operation bands is presented and investigated in this letter. Originated from the traditional Marchand balun, the proposed dual-band balun is designed on a symmetrical four-port network with one short-circuited port. Derived equations and design charts show that the frequency ratio ( $m = f_{2}/f_{1}$ ) of these two bands could be flexibly controlled in a wide range of 2.0–4.6. Moreover, inherent transmission zeros nearby each band have been introduced into this dual-band balun, aiming to improve the frequency selectivity. For verification, a prototype dual-band balun operating at 2.4 and 5.2 GHz ( $m = 2.17$ ) is implemented and measured. Both simulation and measured results are recorded with good agreement.
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