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access icon free Millimetre-wave low-temperature co-fired ceramic bandpass filter with independently controllable dual passbands

  • Author(s): Yun-Li Li 1, 2 ; Jian-Xin Chen 1, 2 ; Wei Qin 1, 2 ; Qing-Yuan Lu 3 ; Zhi-Hua Bao 1, 2
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  • Source: Volume 11, Issue 11, 08 September 2017, p. 1558 – 1564
    DOI:  10.1049/iet-map.2016.0946 , Print ISSN 1751-8725, Online ISSN 1751-8733
© The Institution of Engineering and Technology
Received 30/10/2016, Accepted 27/05/2017, Revised 28/12/2016, Published 31/05/2017

This study presents a detailed investigation on the frequency properties of the stub-loaded stepped-impedance resonator (SIR). For the first time, the frequency controllability of the third and fifth harmonic resonant frequencies (f 3 and f 5) of the SIR under different ratios of impedance and electric length is subjected to a complete theoretical analysis. It can be found that there is a length ratio which makes f 3 and the voltage-null point at f 3 never be affected by the change of the impedance ratio. Furthermore, the stub loaded at this voltage-null point also has no effect on f 3. These features are successfully applicable to realise independent frequency control for dual-band bandpass filters (BPFs). In this situation, a new coupling path through the loaded stub can be constructed only for f 5, and the coupling coefficients for the two bands can be individually varied. Accordingly, both the operational frequencies and bandwidths of the two bands can be separately adjusted. For demonstration, an independently controllable dual-band BPF operating at 27.5/33 GHz is designed and fabricated for millimetre-wave wireless applications. Good accordance is achieved between the simulated and measured results.

Inspec keywords: crystal filters; microwave filters; resonator filters; millimetre wave filters; microwave resonators; millimetre wave resonators; frequency control; band-pass filters

Other keywords: frequency 33 GHz; millimetre wave wireless application; independently controllable dual-band BPF; fifth harmonic resonant frequencies; stub-loaded stepped-impedance resonator frequency properties; frequency 27.5 GHz; coupling coefficient; SIR frequency properties; independent frequency control; voltage-null point; third harmonic resonant frequencies; coupling path; millimetre wave low-temperature cofired ceramic bandpass filter; independently controllable dual passband; impedance electric length ratios

Subjects: Waveguide and microwave transmission line components; Passive filters and other passive networks; Piezoelectric devices

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