Balanced-to-balanced dual-band bandpass filter with common-mode rejection spurious suppression and independent bands

Johanny A. Escobar-Peláez, José L. Olvera-Cervantes and Alonso Corona-Chávez

Journal of Electromagnetic Waves and Applications, 2015, vol. 29, issue 13, 1803-1811

Abstract: A novel balanced-to-balanced dual-band bandpass filter is presented. The structure is obtained by combining two single-layer balanced-to-balanced bandpass filters (BBPF) with microstrip lines. Characteristics of each band can be designed independently. The final structure exhibits a reduced size with 0.4 λg × 0.22 λg where λg is the guided wavelength at the lower frequency. A good out-of-band response is achieved with a spurious frequency value of 5.6 times the lowest central frequency. Common-mode rejection is 58 and 45 dB for the first and second central frequencies, respectively.

Date: 2015
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DOI: 10.1080/09205071.2015.1062807

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