Balanced-to-Balanced Microstrip Diplexer Based on Magnetically Coupled Resonators

IEEE Access

Armando Fernandez-Prieto¹  Ferran Martin²  Jesus Martel³  Francisco Medina⁴  Aintzane Lujambio⁵  Rafael R. Boix⁶ 

[1] Departamento de Electr&x00F3;Departamento de F&x00ED;Parts Laboratory Department, Alter Technology T&x00DC;V Nord S.A.U., Seville, Spain;nica y Electromagnetismo, Facultad de Física, Universidad de Sevilla, Sevilla, Spain;sica Aplicada II, ETSA, Sevilla, Spain;

关键词: Balanced-to-balanced diplexer;    common-mode rejection;    differential-mode;    magnetic coupling;    microstrip resonators;   

DOI  :  10.1109/ACCESS.2018.2820073

来源: DOAJ

【 摘 要 】

Two balanced-to-balanced planar diplexers based on magnetically coupled microstrip resonators are proposed in this paper. For the first prototype, each channel/differential-output is composed of a second order single-band balanced bandpass filter based on open-loop resonators. For the second diplexer example, the filters composing the differential outputs are fourth order and are implemented by means of folded stepped-impedance resonators. The design procedure for the differential response is quite straightforward, since it is based on the use of the well-known external quality factor and coupling coefficients concepts. Common-mode is inherently rejected thanks to the benefits of magnetic coupling, which precludes common-mode transmission over a wide frequency range. The proposed structure also offers a high level of channel-to-channel isolation. To demonstrate the usefulness of the proposed idea, the two prototypes are simulated, fabricated, and measured. Good differential-mode and common-mode performance is observed in both examples. Simulations and measurements show good agreement.

【 授权许可】

Unknown