Novel common mode suppression network for the transformation of single-ended to balanced filters

作者：Escobar Pelaez Johanny; Luis Olvera Cervantes Jose; Corona Chavez Alonso^*

来源：Microwave and Optical Technology Letters, 2016, 58(12): 2831-2833.

DOI：10.1002/mop.30161

• microstrip
• bandpass filter
• balanced-to-balanced
• common mode rejection
• high spurious attenuation

A novel method to obtain balanced structures is introduced. The balanced behavior of a single- ended structure is achieved by combining two stages of the single-ended device, by means of a new common mode suppression network (CMSN). As an example, a conventional single-ended balanced bandpass filter (BPF) was designed, and then transformed into a balanced bandpass filter (BBPF). Around the design frequency, the differential mode (DM) of the balanced structure inherits the performance of the single-ended filter, whist suppressing the common mode (CM) signals more than 20 dB. Additionally, the out-of-band response of the single-ended filter is improved in the balanced prototype by attenuating the first spurious frequency from 0 dB to 20 dB. Good agreement between simulated and experimental results is obtained.

• 出版日期2016-12