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Progress In Electromagnetics Research Letters
ISSN: 1937-6480
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INVESTIGATION OF DUAL-BAND BALUN BANDPASS FILTERS BASED ON COUPLED RING RESONATORS

By H. Wang, B. H. Yin, W. Kang, G. Yang, and W. Wu

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Abstract:
An investigation of dual-band balanced-to-unbalanced (blaun) bandpass filters (BPFs) is presented in this letter. Two types of balun BPFs named Type-A and Type-B filters based on coupled ring resonators are discussed and fabricated. Both the simulated and measured results show that these balun-BPFs have not only good amplitude performances but also excellent phase difference performances. The center frequencies of these balun BPFs are set at 2.4 GHz/5.6 GHz for Type-A and 1.57/4.65 GHz for Type-B balun filters. The differences are 180° ± 5° in phase and within 0.6 dB in magnitude of type A and 0.73 dB of type B, respectively. Thus, these balun BPFs can be used in many wireless communication systems.

Citation:
H. Wang, B. H. Yin, W. Kang, G. Yang, and W. Wu, "Investigation of Dual-Band Balun Bandpass Filters Based on Coupled Ring Resonators," Progress In Electromagnetics Research Letters, Vol. 41, 21-28, 2013.
doi:10.2528/PIERL13051407

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