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Riaz, Muhammad, Virdee, Bal Singh, Shukla, Pancham, Ouazzane, Karim, Onadim, Muhittin and Salekzamankhani, Shahram (2019) Quasi-elliptic dual-band planar BPF with high-selectivity and high inter-band isolation for 5G communications systems. Microwave and Optical Technology Letters. pp. 1-7. ISSN 0895-2477
A novel dual-band planar bandpass filter structure is presented that exhibits the following characteristics: (i) a quasi-elliptic function response with high passband selectivity; (ii) high inter-band isolation; and (iii) a wide out-of-band rejection. The filter is suitable for highly demanding wireless communications systems where the channel capacity is at a premium. The via-free dual-band filter consists of open-loop resonators that are shunt loaded with a half-wavelength open-circuit stub. The resonators are coupled electromagnetically to the stepped impedance resonators, which are inter-digitally coupled to the input/output feed lines. Altering the dimensions of the two stubs allow modification of the resonant mode and transmission zero frequencies. Measured results validate the filter’s performance. The center frequencies of the two passband responses at 4.6 GHz and 5.4 GHz have 3-dB fractional bandwidth of 13.5% and 11.5%, respectively. Insertion-loss at the two passband center frequencies are 1.02 and 0.8 dB, and the return-loss is better than 20 dB. Skirt steepness of the filter is >290 dB/GHz, and isolation between the two closely positioned adjacent bands is better than 35 dB.
Available under License Creative Commons Attribution Non-commercial No Derivatives 4.0.
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