Abstract
The design and implementation of the filters for the fifth-generation (5G) mobile communication systems are challengeable due to the demands of high integration, low-cost, and high-speed data transmission. In this paper, a dual-wideband bandpass filter (BPF) and a tri-wideband BPF for 5G mobile communications are proposed. The dual-wideband BPF consists of two folded open-loop stepped-impedance resonators (FOLSIRs), and the tri-wideband BPF is designed by placing a pair of folded uniform impedance resonator inside the dual-wideband BPF with little increase in the physical size of the filter. By employing a novel structural deformation of a stepped-impedance resonator, the FOLSIR is achieved with a more compact structure, a controllable transmission zero, and an adjustable resonant frequency. The measurement results show that the working bands of the two filters are 1.98–2.28/3.27–3.66 GHz and 2.035–2.305/3.31–3.71/4.54–5.18 GHz, respectively, which are consistent with the full-wave EM simulation results. The implemented filters have a compact size and the results show low loss, good out-of-band rejection, and wide passbands covering sub-6 GHz bands of 5G mobile communications and a commonly used spectrum.
Highlights
In 2015, the International Telecommunication Union-Radio Communication Sector (ITU-R, Geneva, Switzerland) defined three typical usage scenarios for the fifth-generation mobile communication system (5G), including enhanced mobile broadband, massive machine-type communications, and ultrareliable and low-latency communication [1]
Measurements are conducted with a network analyzer, the implemented filters have a compact size, and the results show low loss, good out-of-band rejection, and wide passbands covering sub-6 GHz bands and other commonly used spectrum
In order to place another pair of resonators and ensure that the structure of the folded open-loop stepped-impedance resonators (FOLSIRs) do not change, the size of L22 is decreased while L21 is increased
Summary
In 2015, the International Telecommunication Union-Radio Communication Sector (ITU-R, Geneva, Switzerland) defined three typical usage scenarios for the fifth-generation mobile communication system (5G), including enhanced mobile broadband (eMBB), massive machine-type communications (mTC), and ultrareliable and low-latency communication (uRLLC) [1]. In Ref [10], a compact tri-band BPF is developed by multi-mode SLR, but with small bandwidth and large insertion loss. In Ref [14], a compact dual-band bandpass filter is obtained by coupling between two modified SIRs; the bandwidth can be adjusted using coupling strengths between resonators, but with large insertion losses and narrow passbands. Due to the embedded structure, the resulting multi-band BPFs usually have compact size [28,29] and adjustable passbands [30,31]. The tri-band BPFs for 5G mobile communication systems with compact size, low loss, and wide passbands have not been proposed and discussed in the literatures.
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