Stopband-Extended and Size-Miniaturized Low-Pass Filter Based on Interdigital Capacitor Loaded Hairpin Resonator with Four Transmission Zeros
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Jia-Jia Wu
und
Lin Li
Abstract
In this paper, a compact low-pass filter (LPF) with wide stopband is proposed based on interdigital capacitor loaded hairpin resonator. The structure composed of an upper high-impedance transmission line, a middle interdigital capacitor, and a pair of inter-coupled symmetrical stepped-impedance stubs. Detailed investigation into this structure based on even-odd mode approach reveals that up to four transmission zeros can be generated and reallocated by choosing the proper circuit parameters. And owing to the aid of transmission zeros, the fabricated quasi-elliptic LPFs experimentally demonstrate a wide 20dB stopband from 1.4fc to 5.1fc using a compact size of only 0.005 λg2.
Acknowledgments
This work was supported by 521 talent project of Zhejiang Sci-Tech University.
References
[1] J. S. Hong and M. J. Lancaster, Microstrip Filters for RF/Microwave Applications. New York: Wiley, 2001, pp. 14–16.10.1002/0471221619Suche in Google Scholar
[2] G. Karimi, A. Lalbakhsh, and H. Siahkamari, “Design of sharp roll-off lowpass filter with ultra wide stopband,” IEEE Microw. Wirel. Compon. Lett., vol. 23, no. 6, pp. 303–305, June. 2013.10.1109/LMWC.2013.2261057Suche in Google Scholar
[3] C.-J. Chen, C.-H. Sung, and S. Yin-Dirn, “A multi-stub losspass filter,” IEEE Microw. Wirel. Compon. Lett., vol. 25, no. 8, pp. 532–534, Aug. 2015.10.1109/LMWC.2015.2440773Suche in Google Scholar
[4] L. H. Hsieh and K. Chang, “Compact elliptic-function low-pass filters using microstrip stepped-impedance hairpin resonators,” IEEE Trans. Microw. Theory Tech., vol. 51, no. 1, pp. 193–199, Jan. 2003.10.1109/TMTT.2002.806901Suche in Google Scholar
[5] M. H. Yang and J. Xu, “Design of compact, broad-stopband lowpass filter using modified stepped impedance hairpin resonators,” Electron. Lett., vol. 44, no. 20, pp. 1198–1199, 2008.10.1049/el:20081875Suche in Google Scholar
[6] F. Wei, L. Chen, X.-W. Shi, Q.-L. Huang, and X.-H. Wang, “Compact lowpass filter with wide stop-band using coupled-line hairpin unit,” IET Electron. Lett., vol. 46, no. 1, pp. 88–90, Jan. 2010.10.1049/el.2010.2411Suche in Google Scholar
[7] W.-H. Tu and K. Chang, “Compact microstrip low-pass filter with sharp rejection,” IEEE Microw. Wirel. Compon. Lett., vol. 15, no. 6, pp. 404–406, June. 2005.10.1109/LMWC.2005.850479Suche in Google Scholar
[8] L. Li, Z.-F. Li, and J.-F. Mao, “Compact lowpass filters with sharp and expanded stopband using stepped impedance hairpin units,” IEEE Microw.Wirel. Compon. Lett., vol. 20, no. 6, pp. 310–312, June. 2010.10.1109/LMWC.2010.2047457Suche in Google Scholar
[9] S. Luo, L. Zhu, and S. Sun, “Stopband expanded lowpass filters using microstrip coupled-line hairpin units,” IEEE Microw. Wirel. Compon. Lett., vol. 18, no. 8, pp. 506–508, Aug. 2008.10.1109/LMWC.2008.2001004Suche in Google Scholar
[10] M. Xiao, G. Sun, and L. Xiaozheng, “A lowpass filter with compact size and sharp roll-off,” IEEE Microw. Wirel. Compon. Lett., vol. 25, no. 12, pp. 790–792, Dec. 2015.10.1109/LMWC.2015.2496801Suche in Google Scholar
[11] V. K. Velidi and S. Sanyal, “Sharp roll-off lowpass filter with wide stopband using stub-loaded coupled-line hairpin unit,” IEEE Microw. Wirel. Compon. Lett., vol. 21, no. 6, pp. 301–303, June. 2011.10.1109/LMWC.2011.2132120Suche in Google Scholar
© 2018 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- Frequency Reconfigurable Antenna for Deca-Band 5 G/LTE/WWAN Mobile Terminal Applications
- Printed Antenna Array with Flat-Top Radiation Pattern
- CPW-fed Circularly Polarized Slot Antenna with Small Gap and Stick-shaped Shorted Strip for UHF FRID Readers
- Frequency Reconfigurable Quasi-Yagi Antenna with a Novel Balun Loading Four PIN Diodes
- Analysis and Optimization of Conformal Patch Excited Wideband DRA of Several Shapes
- Synthesis of Conformal Phased Antenna Arrays With A Novel Multiobjective Invasive Weed Optimization Algorithm
- Stopband-Extended and Size-Miniaturized Low-Pass Filter Based on Interdigital Capacitor Loaded Hairpin Resonator with Four Transmission Zeros
- Electronically Reconfigurable Varactor-Loaded HMSIW Bandpass Filter
- Differential BPFs with Multiple Transmission Zeros Based on Terminated Coupled Lines
- Wideband Bandpass Filter with High Selectivity and an Adjustable Notched-band Adopting a Multi-mode Resonator
- UWB Bandpass Filter with Ultra-wide Stopband based on Ring Resonator
- Design of Compact Wilkinson Power Divider with Harmonic Suppression using T-Shaped Resonators
- Dual Segment Glocal Model Based Capacitive Level Sensor (CLS) for Adhesive Material and Level Detection
- 100 GHz FMCW Radar Module Based on Broadband Schottky-diode Transceiver
- Modeling of Graphene Planar Grating in the THz Range by the Method of Singular Integral Equations
- Evanescent-Wave Reconstruction in Time Reversal System
- White Gaussian Noise – Models for Engineers
Artikel in diesem Heft
- Frontmatter
- Frequency Reconfigurable Antenna for Deca-Band 5 G/LTE/WWAN Mobile Terminal Applications
- Printed Antenna Array with Flat-Top Radiation Pattern
- CPW-fed Circularly Polarized Slot Antenna with Small Gap and Stick-shaped Shorted Strip for UHF FRID Readers
- Frequency Reconfigurable Quasi-Yagi Antenna with a Novel Balun Loading Four PIN Diodes
- Analysis and Optimization of Conformal Patch Excited Wideband DRA of Several Shapes
- Synthesis of Conformal Phased Antenna Arrays With A Novel Multiobjective Invasive Weed Optimization Algorithm
- Stopband-Extended and Size-Miniaturized Low-Pass Filter Based on Interdigital Capacitor Loaded Hairpin Resonator with Four Transmission Zeros
- Electronically Reconfigurable Varactor-Loaded HMSIW Bandpass Filter
- Differential BPFs with Multiple Transmission Zeros Based on Terminated Coupled Lines
- Wideband Bandpass Filter with High Selectivity and an Adjustable Notched-band Adopting a Multi-mode Resonator
- UWB Bandpass Filter with Ultra-wide Stopband based on Ring Resonator
- Design of Compact Wilkinson Power Divider with Harmonic Suppression using T-Shaped Resonators
- Dual Segment Glocal Model Based Capacitive Level Sensor (CLS) for Adhesive Material and Level Detection
- 100 GHz FMCW Radar Module Based on Broadband Schottky-diode Transceiver
- Modeling of Graphene Planar Grating in the THz Range by the Method of Singular Integral Equations
- Evanescent-Wave Reconstruction in Time Reversal System
- White Gaussian Noise – Models for Engineers
