Novel planar lowpass filter using microstrip rectangular patch and high-impedance cells for wireless communication systems
Abstract
This paper presents a novel microstrip lowpass filter. The proposed filter consists of two high impedance cells, which are integrated by a stub loaded transmission line. A rectangular stub is utilized to reduce the overall circuit size so that it has a compact size of 0.0135 λg2 where λg is the guided wavelength calculated at -3 dB cut-off frequency of 2.5 GHz. In comparison to the published papers referred in this paper, a good figure-of-merit is obtained, which indicates this filter is designed correctly. An approximated LC circuit is introduced to analysis the configuration of proposed structure. Based on transmission line theory, the lumped elements are calculated. Then the LC model is simulated where the obtained results are similar to EM simulator approximately. To verify the design methodology, the proposed filter is fabricated and measured. There is a good agreement between the simulation and measurement results.
References
A. Rezaei and L. Noori, 2017. Tunable microstrip dual-band bandpass filter for WLAN applications. Turkish journal of electrical engineering & computer science, 25: 1388-1393.
C. Karpuz, A. K. Gorur, and M.Emur, 2016. Quad-Band Microstrip Bandstop Filter Design Using Dual-Mode Open Loop Resonators Having Thin Film Capacitors. IEEE Microwave and Wireless Components Letters. 26(11):873-875.
M. Salehi and L. Noori, 2014. Novel 2.4GHZ Branch-Line Coupler Using Microstrip Cells. Microwave and Optical Technology Letters. 56 (9): 2110-2113.
M. Salehi, L. Noori and E. Abiri, 2015. Novel Tunable Branch-Line Coupler for WLAN Applications, Microwave and Optical Technology Letters, 57 (5): 1081-1084.
L. Noori and A. Rezaei, 2017. Design of a Microstrip Diplexer with a Novel Structure for WiMAX and Wireless Applications. AEU-International Journal of Electronics and Communications, 77:18-22.
A. Rezaei, L. Noori and H. Mohammadi, 2017. Design of a novel compact microstrip diplexer with low insertion loss. Microwave and optical Technology Letters, 59(7):1672-1676.
P.-H. Deng, B.-L. Huang, and B.-L. Chen, 2015. Designs of Microstrip Four- and Five-Channel Multiplexers Using Branch-Line-Shaped Matching Circuits. IEEE Transanction on Components Packing and Manufacturing Technology, 5(9): 1331-1338.
S. Majidifar, 2016. Design of High Performance Miniaturized Lowpass Filter Using New Approach of Modeling. Applied Computational Electromagnetics Society Journal. 31(1): 52-57.
M. Hayati and A. Lotfi, 2010. Elliptic-function lowpass filter with sharp cutoff frequency using slit-loaded tapered compact microstrip resonator cell. Electronics Letters. 46 (2) :143 – 144.
A.K. Verma, N. P. Chaudhari and A. Kumar, 2013. Improved performance step impedance lowpass filter. International Journal of Electronics and Communications (AEÜ). 67(9): 761-770, 2013.
J. Chen, Z.-B. Weng, Y.-C. Jiao, and F.-S. Zhang, 2007 .Lowpass Filter Design of Hilbert Curve Ring Defected Ground Structure. Progress in Electromagnetics Research. 70: 269–280.
Y. Yang, X. Zhu, and N. C. Karmakar, 2012. Microstrip Lowpass Filter Based on Split Ring and Complementary Split Ring Resonators. Microwave and optical Technology Letters. 54(7): 1723-1726, 2012.
S. S. Karthikeyan and R. S. Kshetrimayum, 2015. Compact and Wide Stopband Lowpass Filter Using Open Complementary Split Ring Resonator and Defected Ground Structure. Radioengineering, 24(3): 708-711.
M. Mirzaee and B.S. Virdee, 2013. Realizations of highly compact planar lowpass filter for UWB RFID applications. Electronics Letters. 49 (22) : 1396–1398.
H. Sariri, Z. Rahmani, A. Lalbakhsh and S. Majidifar, 2013. Compact LPF Using T-shaped Resonator. Frequenz Journal, 67(1-2): 17-20.
M. Hayati, A. Sheikhi and A. Lotfi, 2010. Compact lowpass filter with wide stopband using modified semi-elliptic and semi-circular microstrip patch resonator”, Electronics Letters. 46(22): 1507 – 1509.
L. Li, and Z.-F. Li, 2008. Compact quasi-elliptic lowpass filter using symmetric rectangular coupled capacitors. Electronics Letters. 44 (2): 124–125.
A.K. Verma and A. Kumar, 2011. Design of low-pass filters using some defected ground structures. International Journal of Electronics and Communications (AEÜ). 65 (10), 864-872.
V. K. Velidi and S. Sanyal, 2011. Sharp Roll-Off Lowpass Filter with Wide Stopband Using Stub-Loaded Coupled-Line Hairpin Unit. IEEE Microwave and Wireless Components Letters, 21 (6): 301-303.
J. S Hong and M. J. Lancaster, 2001. Microstrip Filters for RF/Microwave Applications. John Wiley & Sons.
