Dual-band devices based on coupled-stripline section with cross-symmetrical loads
Keywords:coupled transmission lines, even-odd excitation of symmetrical two-port network, input impedance, dual-band operation mode, dual-band fixed phase shifter, dual-band impedance transformer, dual-band bandpass filter
An equivalent representation of a circuit formed by coupled lines section with cross-symmetrical loads and additional reactive elements is suggested in the form of partial one-port networks with in-phase or antiphase excitation. Analytical relations for the electrical parameters calculation of elements of the circuit, which enables one to implement devices with dual-band operation mode, have been obtained based on the input impedances of these one-port networks. The examples of application of relations obtained for the simulation of dual-band phase shifters with fixed phase difference, impedance transformers and bandpass filters are provided. The simulation results are confirmed by experimental investigations of these devices.
PARK, MYUN-JOO. Dual-band Wilkinson divider with coupled output port extensions. IEEE Trans. Microwave Theory Tech., Sept. 2009, v.57, n.9, p.2232-2236, DOI: http://dx.doi.org/10.1109/TMTT.2009.2027169.
LIN, Z.; CHU, Q.-X. A novel approach to the design of dual-band power divider with variable power dividing ratio based on coupled-lines. PIER, 2010, v.103, p.271-284, DOI: http://dx.doi.org/10.2528/PIER10012202.
WU, YONGLE; LIU, YUANAN; XUE, QUAN. An analytical approach for a novel coupled-line dual-band Wilkinson power divider. IEEE Trans. Microwave Theory Tech., Feb. 2011, v.59, n.2, p.286-294, DOI: http://dx.doi.org/10.1109/TMTT.2010.2084096.
LI, B.; WU, X.; YANG, N.; WU, W. Dual-band equal/unequal Wilkinson power dividers based on coupled-line section with short-circuited stub. PIER, 2011, v.111, p.163-178, DOI: http://dx.doi.org/10.2528/PIER10110108.
PRUDYUS, I.N.; OBORZHYTSKYY, V.I. A simulation technique for the dual-band equal-path power dividers based on coupled transmission lines. Proc. of 21st Int. Crimean Conf. on Microwave Engineering and Telecommunications Technologies, CriMiCo, 12-16 Sept. 2011, Sevastopol, Ukraine. Sevastopol: Veber, 2011, v.2, p.612-613.
YEUNG, L.K. A compact dual-band 90° coupler with coupled-line sections. IEEE Trans. Microwave Theory Tech., Sept. 2011, v.59, n.9, p.2227-2232, DOI: http://dx.doi.org/10.1109/TMTT.2011.2160199.
PARK, M.-J. Comments on “A compact dual-band 90° coupler with coupled-line sections”. IEEE Trans. Microwave Theory Tech., Jan. 2012, v.60, n.1, p.201, DOI: http://dx.doi.org/10.1109/TMTT.2011.2175243.
OBORZHYTSKYY, V.; SAMSONYUK, O. Design of dual-frequency TEM-mode coupled-line directional couplers. Proc. of XIth Int. Conf. on Modern Problems of Radio Engineering, Telecommunications and Computer Science, TCSET’2012, 21-24 Feb. 2012, Lviv-Slavske, Ukraine. IEEE, 2012, p.179, INSPEC: 12725539.
WANG, XI; YIN, WEN-YAN; WU, KE-LI. A dual-band coupled-line coupler with an arbitrary coupling coefficient. IEEE Trans. Microwave Theory Tech., Apr. 2012, v.60, n.4, p.945-951, DOI: http://dx.doi.org/10.1109/TMTT.2012.2185949.
MATTHAEI, G.L.; YOUNG, LEO; JONES, E.M.T. Microwave Filters, Impedance-Matching Networks, and Coupling Structures, Vol. 2. New York: McGraw-Hill, 1964.
MARCH, S. A wideband stripline hybrid ring. IEEE Trans. Microwave Theory Tech., June 1968, v.16, n.6, p.361, DOI: http://dx.doi.org/10.1109/TMTT.1968.1126693.
PODCAMENI, A. Symmetrical and asymmetrical edge-coupled-line impedance transformers with a prescribed insertion loss design. IEEE Trans. Microwave Theory Tech., Jan. 1986, v.34, n.1, p.1-6, DOI: http://dx.doi.org/10.1109/TMTT.1986.1133273.
JENSEN, T.; ZHURBENKO, V.; KROZER, V.; MEINCKE, P. Coupled transmission lines as impedance transformer. IEEE Trans. Microwave Theory Tech., Dec. 2007, v.55, n.12, p.2957-2965, DOI: http://dx.doi.org/10.1109/TMTT.2007.909617.
AHN, HEE-RAN; ITOH, T. Impedance-transforming symmetric and asymmetric dc blocks. IEEE Trans. Microwave Theory Tech., Sept. 2010, v.58, n.9, p.2463-2474, DOI: http://dx.doi.org/10.1109/TMTT.2010.2058936.
ZYSMAN, G.I.; JOHNSON, A.K. Coupled transmission line networks in an inhomogeneous dielectric medium. IEEE Trans. Microwave Theory Tech., Oct. 1969, v.17, n.10, p.753-759, DOI: http://dx.doi.org/10.1109/TMTT.1969.1127055.
MATTHAEI, G.L.; YOUNG, LEO; JONES, E.M.T. Microwave Filters, Impedance-Matching Networks, and Coupling Structures, Vol. 1. New York: McGraw-Hill, 1964.
FELDSTEIN, A.L.; YAVICH, L.R. Synthesis of Microwave Two-Port and Four-Port Networks. Moscow: Svyaz’, 1971 [in Russian], 388 p.
OBORZHYTSKYY, V.I. Utilization of symmetry singularities of linear high-frequency devices in their synthesis techniques. Digest of Scientific Papers of IAME. Ser. Simulation and Information Technologies, 2005, n.29, p.129-134.
OBORZHYTSKYY, V.I. Approach of calculation of parameters of symmetrical high-frequency two-port network in the problems of impedance transformation. Digest of Scientific Papers of IAME. Ser. Simulation and Information Technologies, 2005, n.34, p.131-137.
PRUDYUS, I.N.; OBORZHYTSKYY, V.I. Design principles of analytical methods for calculation of dual-band strip directional couplers with full structure symmetry. Izv. Vyssh. Uchebn. Zaved., Radioelektron., 2014, v.57, n.4, p.19-32, http://radio.kpi.ua/article/view/S0021347014040025; Radioelectron. Commun. Syst., 2014, v.57, n.4, p.159-168, http://radioelektronika.org/article/view/S0735272714040025, DOI: http://dx.doi.org/10.3103/S0735272714040025.