Abstract
In this paper, a wideband bandpass filter (BPF) with simultaneous bandwidth and notch tuning is proposed, by using a dual cross-shaped resonator (DCSR) with parallel-coupled three-line (PCTL) feeding. It is found that three intrinsic transmission zeros can be generated by the proposed DCSR, while two of the zeros are used for the implementation of passband edge zeros and the other one is for a notch. Three varactors are used to implement the bandwidth and notch tuning independently. These innovative integrated functions of both tunable bandwidth and notch in a single architecture are proposed for the first time. On the other hand, the PCTL can provide sufficiently strong coupling in the desired passband. The proposed BPF can achieve the bandwidth tuning with a fixed notch inside/outside the passband, and the bandwidth can also be kept unchanged when tuning a notch within the passband. The prototyped BPF centered at 6 GHz reports that the absolute bandwidth (ABW) can be varied from 2.5 to 5.8 GHz, while the fractional bandwidth (FBW) is tuned from 41.7% to 96.7% together with notch frequency tuning of 5.0 to 8.2 GHz. The experimental measurements are in good agreement with the theoretical analysis.
Highlights
In various wireless communication and radar systems with multi-function and multi-band operations, the bandpass filters (BPFs) with reconfigurable center frequency and bandwidth are essential
A three-pole microstrip BPF with a tunable bandwidth of 70 – 100 MHz is presented in [6], by using only one varactor between the resonators for bandwidth control. Another BPF uses a single PIN diode as a switch to connect or disconnect the loaded open-loop and reported the bandwidth tuned from 29% to 50% at 1.5 GHz [7]
A wideband BPF integrated the functions of simultaneous bandwidth and notch tuning based on a novel dual cross-shaped resonator (DCSR) and parallel-coupled three-line (PCTL), is presented
Summary
In various wireless communication and radar systems with multi-function and multi-band operations, the bandpass filters (BPFs) with reconfigurable center frequency and bandwidth are essential. A three-pole microstrip BPF with a tunable bandwidth of 70 – 100 MHz is presented in [6], by using only one varactor between the resonators for bandwidth control Another BPF uses a single PIN diode as a switch to connect or disconnect the loaded open-loop and reported the bandwidth tuned from 29% to 50% at 1.5 GHz [7]. C. Teng et al.: Design of Wideband BPF with Simultaneous Bandwidth and Notch Tuning Based on DCSR bandwidth is presented in [9], which indicates wide tunable center frequencies (0.56 – 1.15 GHz) and 1-dB bandwidth (65 – 180 MHz), it is still applied for the narrow band.
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