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A Compact Size 5G Hairpin Bandpass Filter with Multilayer Coupled Line

Qazwan Abdullah1,2,*, Ömer Aydoĝdu2, Adeeb Salh3, Nabil Farah4, Md Hairul Nizam Talib4, Taha Sadeq5, Mohammed A. A. Al-Mekhalfi3, Abdu Saif6
1 Faculty of Electrical and Electronic Engineering, Selçuk University, Konya, Turkey
2 Faculty of Engineering and Natural Sciences, Konya Technical University, Konya, Turkey
3 Faculty of Engineering Technology, Universiti Tun Hussein Onn Malaysia, Pagoh, Muar, Johor, Malaysia
4 Faculty of Electrical Engineering, Universiti Teknikal Malaysia Melaka, Melaka, Malaysia
5 Faculty of Engineering and Science, Universiti Tunku Abdul Rahman, Sungai Long Campus, Selangor, 43000, Malaysia
6 Faculty of Electrical Engineering Department, University of Malaya, Kuala Lumpur, Malaysia
* Corresponding Author: Qazwan Abdullah. Email:

Computers, Materials & Continua 2021, 69(3), 4025-4042.

Received 21 March 2021; Accepted 02 May 2021; Issue published 24 August 2021


The multilayer structure is a promising technique used to minimize the size of planar microstrip filters. In the flexible design and incorporation of other microwave components, multilayer band-pass filter results in better and enhanced dimensions. This paper introduces a microstrip fifth-generation (5G) low-frequency band of 2.52–2.65 GHz using a parallel-coupled line (PCL) Bandpass filter and multilayer (ML) hairpin Bandpass filter. The targeted four-pole resonator has a center frequency of 2.585 GHz with a bandwidth of 130 MHz. The filters are designed with a 0.1 dB passband ripple with a Chebyshev response. The hairpin-line offers compact filter design structures. Theoretically, they can be obtained by bending half-wavelength resonator resonators with parallel couplings into a “U” shape. The proposed configuration of the parallel-coupled line resonator is used to design the ML band-pass filter. The FR4 substrate with a dielectric constant () of 4.3 and 1.6 mm thickness was used. A comparative analysis between the simulated insertion loss and the reflection coefficient of substrates RO3003 and FR4 was performed to validate the efficiency of the proposed filter design. Simulation of PCL filter is accomplished using computer simulation technology (CST) and an advanced design system (ADS) software. The PCL Bandpass filter was experimentally validated and a total tally between simulation results and measured results were achieved demonstrating a well-measured reflection coefficient. The simulated results obtained by the hairpin ML bandpass filter show that the circuit performs well in terms of Scattering(S) parameters and the filter size is significantly reduced.


Band-pass filter; 5G; hairpin multi-layer; size reduction; parallel-coupled line

Cite This Article

Q. Abdullah, . Aydoĝdu, A. Salh, N. Farah, M. Hairul Nizam Talib et al., "A compact size 5g hairpin bandpass filter with multilayer coupled line," Computers, Materials & Continua, vol. 69, no.3, pp. 4025–4042, 2021.

This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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