Abstract
A high-performance miniaturized multi-mode ultra-wide band (UWB) filter is proposed in this paper. The simple compact quintuple-mode resonator is constructed by loading three sets of open stubs on a modified conventional triple-mode resonator. Even and odd mode analytical methods are applied to analyze it. In addition, the function of each part of the filter is studied in cases of weak/strong coupling. In order to further improve the insertion loss, selectivity and out-of-band suppression, the designed filter is finally fabricated on double-sided YBCO/MgO/YBCO high-temperature superconducting (HTS) film. The test results show that the HTS UWB filter has excellent performance, and the simulation results are in good agreement with the test ones. The 3-dB bandwidth covers 3.6 ~ 13.2 GHz. The maximum insertion loss in the band was only 0.32 dB, and the reflection was better than –15.1 dB. The band-edge roll-off rate was 56 dB/GHz and the upper stopband with 20 dB rejection extended to 20.7 GHz.
Highlights
Because of the rapid development of fifth generation (5G) communication and Internet of Things (IoT) technology, ultra-wide band (UWB) wireless communication system has become a hot research topic
An excellent UWB filter should have the characteristics of low insertion loss, a low-voltage standing wave ratio (VSWR), a high band-edge roll-off rate and small size
In 2018, we designed two UWB filters based on these two structures [14,15], but their return loss and dimension still have room for improvement
Summary
Because of the rapid development of fifth generation (5G) communication and Internet of Things (IoT) technology, ultra-wide band (UWB) wireless communication system has become a hot research topic. Many kinds of UWB filters based on multi-mode resonators have been widely studied by researchers [2,3,4,5,6,7,8,9]. In 2018, we designed two UWB filters based on these two structures [14,15], but their return loss and dimension still have room for improvement. The high-impedance lines of the traditional triple-mode resonator were bent by. The UWB filter was fabricated on a high-temperature superconductor to well. The UWB filter fabricated onfabricated a high-temperature superconductor to efficaciously improved as well. Thewas filter was on a high-temperature superconductor to efficaciously ameliorate the problems mentioned above.
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