Abstract
Based on a new topology, a series of single-/dual-wideband bandpass filters (SWB/DWB BPFs) with reconfigurable masses of properties are presented. The proposed design starts from a dual-wideband passive filtering structure, which owns five transmission zeros in the stopbands and three transmission poles in each passband. Then, three capacitors are employed as the tuning elements. By controlling these three capacitors, DWB BPFs with different reconfigurable properties, including three independently tunable passband edges, tunable center frequency of lower passband with fixed absolute bandwidth, tunable bandwidth of lower passband with fixed center frequency, and switchable lower passband, can be realized. In addition, SWB BPF with tunable bandwidth also can be achieved by varying the inserted capacitors. For verification, a prototype with different capacitors is designed and fabricated. As the measured and simulated results agree well with each other, a simple design approach of reconfigurable SWB/DWB BPFs can be verified.
Highlights
In the high-data telecommunication systems, single-/dual-wideband bandpass filters (SWB/DWBBPFs) with compact size and good responses play an important role, and various approaches have been proposed for such filters [1,2,3,4,5]
DWB BPF with a controllable stopband has been designed based on terminated multi-mode resonator [4]
The center frequency of a four-pole SWB BPF can be varied from 1.05 GHz to 1.40 GHz while its corresponding absolute bandwidth is fixed about 134.5 MHz [8]
Summary
In the high-data telecommunication systems, single-/dual-wideband bandpass filters Dual-band BPFs with switchable passbands [15,16,17], much less efforts have been devoted to DWB ones with tunable bandwidths, and only six IEEE journal papers have been reported [18,19,20,21,22,23]. A novel topology for the design of SWB/DWB BPFs with masses of reconfigurable properties is proposed. SWB BPFs with independently tunable first passband edge can be designed by using the proposed topology. To the best of the authors’ knowledge, a single prototype, which can achieve SWB BPFs with tunable bandwidth, and DWB BPFs with tunable bandwidths, tunable center frequency, and switchable passband simultaneously, has never been reported before.
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