Compact wideband filtering microstrip crossover with separated operating frequencies.

Abstract: In this article, a compact wideband crossover with filtering performance is presented, with separated operating frequencies in two transmission paths. First, a novel crossover core circuit is presented based on cross‐shaped coupled lines. The odd‐even mode method is adopted to extract the transmission and isolation characteristics. Then, the loading sections are added in the core circuit to construct the proposed crossover, which can achieve enhanced filtering and isolating performances. The detailed design procedures of specific crossover are presented. Finally, a wideband filtering crossover centered at 2.03 and 3.54 GHz with measured bandwidths of 0.6 and 0.62 GHz is fabricated and measured, which verifies the proposed structures well. As to isolate these two signal paths by adopting conventional crossover with same frequency, the operating bandwidth of crossover should be wider than 2.11 GHz with center frequency of 2.78 GHz. [ABSTRACT FROM AUTHOR]