Abstract
This paper presents an ultra-wideband bandpass filter (UWB-BPF) with a notch band and a wide upper stopband. Two pairs of half-wavelength high-impedance line resonators tightly and strongly coupled to the input/output lines are used to provide the wideband responses. The first UWB responses of 3.4–5.0 GHz and the second UWB of 6.0–10.0 GHz are designed independently first and then combined together for the application of a direct-sequence ultra-wideband bandpass (DS-UWB) system. Without using any extra bandstop structure, a notch band at 5.2 GHz can be obtained. The fabricated UWB-BPF with a compact circuit size exhibits good passband performances including insertion losses of 1 ± 0.3 and 2 ± 0.4 dB for first and second passbands, respectively, a high isolation at 5.2 GHz with an attenuation level of 22.7 dB, and wide upper stopband responses from 11 GHz to 19 GHz, simultaneously. The measured results also exhibit good agreement with the simulated results.
Highlights
In recent years, multi-functional mobile wireless communication systems have been developed rapidly
The bandpass filters (BPFs) are crucial devices in the communication system. Both academia and industry have conducted many significant research activities exploring various UWB components and devices applied to a direct-sequence ultra-wideband (DS-UWB) system from 3.1 to 10.6 GHz with a notch band at 5.7 GHz [2,3]
Theopen/shorted bandwidth was not large enough and the a wideband bandpass filter was proposed by means of split circular rings and rectangular stubs
Summary
Multi-functional mobile wireless communication systems have been developed rapidly. In [9,10,11], wideband BPFs with notched bands were designed using different open/shorted stub-loaded resonators. In [12], a wideband bandpass filter was proposed by means of BPFs circular with notched were designed using different stub-loaded resonators. Theopen/shorted bandwidth was not large enough and the a wideband bandpass filter was proposed by means of split circular rings and rectangular stubs. [14], a wideband bandpass filter was reported using a multi-layer structure; the design procedure a wideband BPF was directly designed by using composite series and shunt resonators. It is still a challenge to design a structure to achieve a notch band, good band isolation and wide stopband UWB-BPF response, without using a complex design process and structure to achieve a notch band, good band isolation simultaneously.
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