Compact Integrated Lumped-Element Bandpass Filter Loaded with Defected Ground Structure Based on Multilayer Liquid Crystal  Polymer Substrate

doi:10.1007/s12204-023-2622-y

Abstract

Abstract: Design of a miniaturized lumped-element bandpass filter in multilayer liquid crystal polymer technology is proposed. Fractional bandwidth of the bandpass filter is 20%, operating at a center frequency of 500MHz. In order to further reduce the size and improve the performance of the proposed filter, defected ground structure (DGS) has been implemented in the filter. Based on this structure, the volume of the inductor is reduced by 60% efficiently compared with the inductor without DGS, and the Q-factor is increased up to 257% compared with the traditional multilayer spiral inductor. The measured results indicate that the designed filter has a very sharp stopband, an insertion loss of 2.3 dB, and a return loss of 18.6 dB in the passband. The whole volume of the fabricated filter is 0.032λg × 0.05λg × 0.000 75λg, where λg is the guided wavelength of the center frequency. The proposed filter is easily integrated into radio-frequency/microwave circuitry at a low manufacturing cost, especially wireless communication.

Key words: multilayer liquid crystal polymer, defected ground structure, bandpass filter, miniaturization, lumped element

摘要： 本文提出了一种基于多层液晶聚合物技术的小型化集总参数带通滤波器的设计。该带通滤波器的相对带宽为20%，中心频率为500 MHz。为了进一步减小滤波器尺寸、改善其性能，在滤波器设计中引入了缺陷地结构。由于缺陷地结构的引入，其电感体积减小了60%，Q值比传统的多层螺旋电感提高到257%。测试结果表明，滤波器具有优异的阻带特性，通带内插入损耗为2.3 dB，回波损耗为18.6 dB。滤波器总体积为0.032λg×0.05λg×0.00075λg（λg为中心频率的导波波长）。本文所提出的滤波器制造成本低、易于在射频/微波电路集成，尤其适用于无线通信系统。

关键词: 多层液晶聚合物，缺陷地结构，带通滤波器，小型化，集总元件

CLC Number:

TN713

LIU Weihong, CHEN Yuan, HUANG Qian, LIU Qingran. Compact Integrated Lumped-Element Bandpass Filter Loaded with Defected Ground Structure Based on Multilayer Liquid Crystal Polymer Substrate[J]. J Shanghai Jiaotong Univ Sci, 2025, 30(2): 227-232.

References

[1] QIAN S, HAO Z C, HONG J, et al. Design and fabrication of a miniature highpass filter using multilayer LCP technology [C]//2011 41st European Microwave Conference. Manchester: IEEE, 2011: 187-190.

[2] QIAN S, HONG J. Miniature quasi-lumped-element wideband bandpass filter at 0.5—2-GHz band using multilayer liquid crystal polymer technology [J]. IEEE Transactions on Microwave Theory and Techniques, 2012, 60(9): 2799-2807.

[3] HEPBURN L, HONG J. On the development of compact lumped-element LCP filters [C]//2014 44th European Microwave Conference. Rome: IEEE, 2014: 544- 547.

[4] HEPBURN L, HONG J. Compact integrated lumped element LCP filter [J]. IEEE Microwave and Wireless Components Letters, 2016, 26(1): 19-21.

[5] WENG L H, GUO Y C, SHI X W, et al. An overview on defected ground structure [J]. Progress in Electromagnetics Research B, 2008, 7: 173-189.

[6] KUMAR A, KARTIKEYAN M V. Design and realization of microstrip filters with new defected ground structure (DGS) [J]. Engineering Science and Technology, an International Journal, 2017, 20(2): 679-686.

[7] RAO Y, QIAN H J, YANG B, et al. Dual-band bandpass filter and filtering power divider with ultra-wide upper stopband using hybrid microstrip/DGS dualresonance cells [J]. IEEE Access, 2020, 8: 23624-23637.

[8] KHAN M T, ZAKARIYA M A, SAAD M N M, et al. Analysis and realization of defected ground structure (DGS) on bandpass filter [C]//2014 5th International Conference on Intelligent and Advanced Systems. Kuala Lumpur: IEEE, 2014: 1-4.

[9] ZHOU P, LI B, LU H, et al. Novel ultrawideband and multimode LTCC common-mode filter based on the dual vertical coupling paths [J]. IEEE Transactions on Components, Packaging and Manufacturing Technology, 2019, 9(7): 1345-1353.

[10] SHEN G, CHE W, XUE Q. Compact microwave and millimeter-wave bandpass filters using LTCC-based hybrid lumped and distributed resonators [J]. IEEE Access, 2019, 7: 104797-104809.

[11] ZHANG J, YOU C J, JIAO Z, et al. A tunable LTCC fourth-order bandpass filter with high selectivity for Lband satellite applications [J]. Microwave and Optical Technology Letters, 2021, 63(4): 1067-1072.

[12] WU D S, LI Y C, XUE Q, et al. LTCC bandstop filters with controllable bandwidths using transmission zeros pair [J]. IEEE Transactions on Circuits and Systems II : Express Briefs, 2020, 67(6): 1034-1038.

[13] UKAEGBU I A, CHOI K S, HIDAYOVO, et al. Smallarea and high-inductance semi-stacked spiral inductor with high Q factor [J]. IET Microwaves, Antennas & Propagation, 2012, 6(8): 880-883.

[14] ZHENG Y, SHENG W. Compact lumped-element LTCC bandpass filter for low-loss VHF-band applications [J]. IEEE Microwave and Wireless Components Letters, 2017, 27(12): 1074-1076.

[15] TA H H, PHAM A V. Compact wide stopband bandpass filter on multilayer organic substrate [J]. IEEE Microwave and Wireless Components Letters, 2014, 24(3): 161-163.

Compact Integrated Lumped-Element Bandpass Filter Loaded with Defected Ground Structure Based on Multilayer Liquid Crystal Polymer Substrate

基于多层液晶聚合物带有缺陷地结构的紧凑型集总参数带通滤波器设计

PDF (PC)

Knowledge

Abstract

Cite this article

share this article

References

Related Articles 4

Recommended Articles 0

Metrics

Comments

[1]	Liu Weihong, Liu Qingran. Novel Compact Dual-Band Bandpass Filter Based on Multilayer Liquid Crystal Polymer Substrate [J]. J Shanghai Jiaotong Univ Sci, 2025, 30(2): 233-238.
[2]	GANJIKUNTA Ganesh Kumar^∗, MOHAMMED Mahaboob Basha, SIBGHATULLAH Inayatullah Khan. Energy Efficient FIR Filter Design Using Distributed Arithmetic [J]. J Shanghai Jiaotong Univ Sci, 2024, 29(6): 1023-1027.
[3]	CHEN Kun(陈坤), ZHAO Xu(赵旭), DONG Chunyu(董春玉), DI Zichao(邸子超), CHEN Zongzhi(陈宗枝). Anti-Occlusion Object Tracking Algorithm Based on Filter Prediction [J]. J Shanghai Jiaotong Univ Sci, 2024, 29(3): 400-413.
[4]	SANGEETA Mandal, SAKTI Prasad Ghoshal, RAJIB Kar, . Optimal Linear Phase Finite Impulse Response Band Pass Filter Design Using Craziness Based Particle Swarm Optimization Algorithm [J]. Journal of shanghai Jiaotong University (Science), 2011, 16(6): 696-703.