Abstract
A novel perturbation approach using additional metalized via-holes for implementation of the dual-band or wide-band dual-mode substrate integrated waveguide (SIW) filters is proposed in this paper. The independent perturbation on the first resonant mode TE101 can be constructed by applying the proposed perturbation approach, whereas the second resonant mode TE102 is not affected. Thus, new kinds of dual-band or wide-band dual-mode SIW filters with a fixed or an independently reconfigurable low-frequency band have been directly achieved. In order to experimentally verify the proposed design method, four two-cavity dual-band SIW filters, which have different numbers of perturbation via-holes in each cavity, and a two-cavity dual-band SIW filter, which includes four via-holes and eight reconfigurable states in each cavity, are designed and experimentally assessed. The measured results indicate that the available frequency-ratio range from 1 to 1.3 can be realized by using four two-cavity dual-band SIW filters. The center frequency of the first band can be tuned from 4.61 GHz to 5.24 GHz, whereas the center frequency of the second one is fixed at around 6.18 GHz for the two-cavity dual-band SIW filter with four reconfigurable states via-holes. All the simulated and measured results show an acceptable agreement with the predicted data.
Highlights
Concurrent multi-band or real-time tunable band radio-frequency/microwave/terahertz transceivers provide effective and productive solutions to overcome the efficient-utilization problem in spectrum congested wireless communications in the real world
The center frequency of the first band can be tuned from 4.61 GHz to 5.24 GHz, but the center frequency of the second band will be unaltered and fixed at around 6.18 GHz for the two-cavity dual-band substrate integrated waveguide (SIW) filter with four reconfigurable via-holes
This paper presents a novel realization of dual-band or wide-band dual-mode substrate integrated waveguide (SIW) filters based on additional metalized via-holes
Summary
Concurrent multi-band or real-time tunable band radio-frequency/microwave/terahertz transceivers provide effective and productive solutions to overcome the efficient-utilization problem in spectrum congested wireless communications in the real world. For mechanically tunable filters[9,10,11,12], the chosen switching elements directly connect the additional metallized via hole with the top metalized layer on the cavity, which can be used as trimming technique and to develop tunable filters Their operating-frequency adjustability is achieved by discretely controlling the switch states. The proposed perturbation approach by using the additional metalized via-holes in dual-band or wide-band even tunable band SIW filters offers a number of advantages including: 1) high selectivity of dual band or wide band, 2) low-cost fabrication using the printed circuit board technology, 3) easy integration with the single-layer circuits and systems, 4) convenient implementation of the tunable or reconfigurable band, and 5) enhanced power capability and decreased radiation loss due to complete shielding with standard metalized via-holes
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