Design of compact tri-band bandpass filter using stub-loaded quarter-wavelength SIRs

Wen, Pin; Ma, Zhewang; Zhu, Shuangshuang; Liu, Haiwen; Ren, Baoping; Guan, Xuehui; Ohira, Masataka

doi:10.1587/elex.16.20190549

Cited by 3 publications

(3 citation statements)

References 30 publications

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“…The third step focuses on the Q − factor of each stub and the global Q g (also called initial quality factor Q i to fix) ones, where the subscript letter "g " indicates the global computation. It appears that using Q g and λ/4 becomes a great option [51]. The open-circuited λ/4 line leads to the stopband filter [52].…”

Section: The Methodology Approachmentioning

confidence: 99%

Four Subbands from Dual Mismatched Wideband Bandpass Filter for 5G/WAS/Wi-Fi/WiMAX/WLAN Applications

Massamba

Mbango

2023

International Journal of RF and Microwave Computer-Aided Engine

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Based on the simplicity of the design method, this paper presents a new approach for developing matched subbands when splitting two mismatched dual-wideband bandpass filters (BPFs) for the fifth generation (5G), wireless access systems (WAS), wireless fidelity (Wi-Fi), worldwide interoperability for microwave access (WiMAX), wireless local area network (WLAN), radar, and other communication devices. The method’s novelty involves using identical quarter-wavelength resonators terminated by alternated short-and-open stub configurations. Both configurations alternate and describe a perfect symmetry by their location from each other to make the subbands possible in the low-frequency and its harmonic (high-frequency) bandwidths (BW). A stub admittance Y 1 is defined and associated with the mainline section characteristic impedance Z 0 and an operating frequency f 0 . A quality factor Q a p is connected to Y 1 and f 0 to approach the BPF global quality factor Q g initially fixed. The stub characteristic impedance and the mainline one differ, while electric lengths (stub and mainline section) are identical. Using the operating frequency determines physical dimensions, creates harmonic frequencies and the rejected BW, mismatches the main frequency BW, matches the subbands, and creates transmission zero (TZ). Hence, a 28.118-dB stopband that separates the two bandpasses at 9.373 GHz is made. At the same time, the unmatched dual ultrawideband (UWB) covers a large panel of communication systems. The lowest (3.146–5.431) and highest (11.891–14.749) GHz BW exhibit a minimum insertion loss (IL) of 0.656 dB and 3.027 dB. The subbands return losses (RL) are better than 28 dB and 19 dB, respectively, and a flat group delay of 0.205 ns is obtained in the upper band. All subbands adaptation methodology is read from 10 dB of the RL. In that case, the four matched subbands in its lower wideband are 3.327–3.709 GHz and 4.442–5.048 GHz, and in its higher wideband are 11.922–12.486 GHz and 14.281–14.653 GHz. The 2275/2858 MHz is the dual-wideband with a fractional BW 53.282/21.456%. The fabricated prototype has validated the EM-simulations, and Anritsu MS4642B 20 GHz vector network analyzer (VNA) has been used for experimental results by scanning the frequency range 3 GHz–15 GHz. The tested prototype is made with a 1 mm FR4 HTG-175 thickness by considering a dielectric constant of 4.4, and its overall size occupies 22.45 × 5.72 m m 2 ( 0.32 λ 0 × 0.082 λ 0 mm 2 ).

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Section: The Methodology Approachmentioning

confidence: 99%

Four Subbands from Dual Mismatched Wideband Bandpass Filter for 5G/WAS/Wi-Fi/WiMAX/WLAN Applications

Massamba

Mbango

2023

International Journal of RF and Microwave Computer-Aided Engine

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“…To design a tri-band BPF, a stub-loaded stepped-impedance resonator (SL-SIR) can be used by combing SIR and SLR. 9,10 However, this filter is large, and cannot control each passband. In, [11][12][13] multimode SL-SIRs with large size and high insertion loss are presented.…”

Section: Introductionmentioning

confidence: 99%

“…[7,8] using stub‐loaded resonator (SLR). To design a tri‐band BPF, a stub‐loaded stepped‐impedance resonator (SL‐SIR) can be used by combing SIR and SLR 9,10 . However, this filter is large, and cannot control each passband.…”

Section: Introductionmentioning

confidence: 99%

A quad‐band defected microstrip structure loaded bandpass filter for standard GPS , WiFi , WLAN , and WiMAX applications

Shakeri

Dousti

Ghalamkari

2022

Int J RF Mic Comp-Aid Eng

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A quad-band bandpass filter is proposed using a defected microstrip structure (DMS) for GPS, WiFi, WLAN, and WiMAX applications. This filter uses a stub-loaded stepped-impedance resonator (SL-SIR). The proposed filter is fabricated on an RT/Duroid5880 substrate (ε r = 2.2, h = 0.787 mm, tanδ = 0.0009).Then, the LC equivalent circuit of the proposed filter is presented. A 28thorder transfer function is obtained and approximated by 8th-order transfer functions. The results of simulation, measurements and the LC equivalent circuit are in good agreement. The proposed filter operates at 1.6, 2.48, 3.76, and 5.44 GHz. The measured insertion losses are 0.32, 027, 0.51, and 0.41 dB in the four bands, while the return losses are better than 10 dB in all frequency bands. Finally, the proposed filter is compared with other bandpass filters.

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Design of high selectivity tri-band bandpass filter based on triple transversal transmission path

Wang,

Chen

et al. 2024

AEU - International Journal of Electronics and Communications

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Design of compact tri-band bandpass filter using stub-loaded quarter-wavelength SIRs

Cited by 3 publications

References 30 publications

Four Subbands from Dual Mismatched Wideband Bandpass Filter for 5G/WAS/Wi-Fi/WiMAX/WLAN Applications

Four Subbands from Dual Mismatched Wideband Bandpass Filter for 5G/WAS/Wi-Fi/WiMAX/WLAN Applications

A quad‐band defected microstrip structure loaded bandpass filter for standard GPS , WiFi , WLAN , and WiMAX applications

Design of high selectivity tri-band bandpass filter based on triple transversal transmission path

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