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In this paper, a new fully symmetrical four-port microstrip crossover and its dual-frequency application are presented. The proposed single-band crossover has a simple structure and an easily controlled bandwidth; and its dual-frequency application can provide flexible frequency ratio between the two working frequencies. Moreover, analytical design equations are derived using the even–odd-mode method...
This paper presents a novel structure for the implementation of compact dual-band balun for multiple-band antenna application. Two stubs tapped to the two balanced ports in a conventional Marchand balun configuration facilitate the dual-band operation. Explicit design equations are derived using even-odd mode analysis. To verify the design concept, a microstrip balun operating at 0.9/2 GHz is fabricated...
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