Compact single/dual band BPF with harmonic suppression using open‐loop resonator and L‐shaped coupling arm. Issue 5 (26th January 2017)

• Record Type: Journal Article
• Authors: Kumar, Nagendra; Kumar Singh, Yatendra
• Is Part Of: IET microwaves, antennas & propagation. Volume 11:Issue 5(2017)
• Page Start: 625
• Page End: 633
• Publication Date: 2017-01-26
• Subjects: band‐pass filters -- UHF resonators -- UHF filters -- band‐stop filters -- harmonics suppression; compact single band BPF -- compact dual band BPF -- harmonic suppression -- open‐loop resonator -- L‐shaped coupling arm -- wide stopband filter -- bandpass filter -- nonuniform gap -- selective suppression -- collective suppression -- higher order harmonics -- voltage wave analysis -- coupling coefficient -- second‐order single‐band BPF -- fourth‐order single‐band BPF -- stub‐loaded stepped impedance OLR -- full‐wave simulation -- high‐frequency structure simulator -- frequency 2.24 GHz; Microwaves -- Periodicals; Microwave antennas -- Periodicals; Antennas (Electronics) -- Periodicals; Radio wave propagation -- Periodicals; Microwave communication systems -- Periodicals; 621.381305
• DOI: 10.1049/iet-map.2016.0502
• Languages: English
• ISSNs: 1751-8725

Abstract

Abstract : A new approach is presented to design a widestopband single and dual‐band bandpass filter (BPF) using L‐shaped coupling‐arm and open‐loop resonators (OLRs). Non‐uniform gap between the L‐shaped coupling‐arm and OLR and the length of the coupling‐arm lead to the selective and collective suppression of higher order harmonics. Using voltage wave analysis, it is shown that the coupling‐coefficient reduces to zero for certain harmonics. To demonstrate the application of the proposed technique single and dual‐band BPFs is designed and fabricated. Second‐ and fourth‐order single‐band BPFs are fabricated for the centre frequency of 2.24 GHz. Harmonic suppression up to 5.8 fo with the suppression level >30 dB is achieved in second‐order BPF. One more second‐order BPF is designed and fabricated using stub‐loaded stepped impedance OLR. This BPF displays widestopband up to 8.4 fo with the suppression level of 30 dB. Further a compact dual‐band BPF is also designed and fabricated. The response shows the harmonic suppression up to 5.3 fo . The measured results are in good agreement with the full‐wave simulation performed by high‐frequency structure simulator.