Abstract
AbstractTwo planar coupled line baluns without vias are designed in this letter. Because of asymmetrical configurations, a virtual port is introduced for even–odd mode analysis, showing the proposed baluns are equivalent to an open‐shorted anti‐coupled line section in odd mode and an open–open coupled line section in even mode. Consequently, bandpass response is obtained in odd mode while suppression is available in even mode, realizing the out‐of‐phase power splitting characteristic. Due to different input and output impedances of the open‐shorted anti‐coupled line sections, the designed baluns have the functionality of impedance transformation, and S‐parameters are then calculated to verify the performance as well. For validation, the two proposed baluns are fabricated with impedance transformers for a 50 Ω test system. The measured results exhibit the two baluns have 16.6% and 18.1% impedance bandwidth centered at 3.5 GHz with an insertion loss of 3.6 and 3.7 dB, respectively.
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