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Parallel-coupled filters using stepped-impedance coupled lines
2016 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT), 2016A stepped-impedance coupled line (SICLN) is proposed in this paper. The proposed SICLN can be equivalent to a conventional quarter-wave coupled line section at the center frequency. The proposed SICLN is applied to half- and quarter-wave parallel-coupled filters. The proposed filters show both size reduction and better spurious responses.
Ting-An Chen +3 more
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Inhomogeneous Coupled-Line Filters
S-MTT International Microwave Symposium Digest, 1974Experimental and Theoretical results are presented demonstrating some novel properties of inhomogeneous coupled-line structures having large even-odd mode velocity ratios, e.g., a single inhomogeneous coupled-line filter section with an equiripple, 3-peak stopband response.
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Coupling in some edge-coupled microshield transmission lines
IEEE Antennas and Propagation Society International Symposium. Digest. Held in conjunction with: USNC/CNC/URSI North American Radio Sci. Meeting (Cat. No.03CH37450), 2004Using the finite-difference time-domain (FD-TD) method in the Cartesian coordinate system, the coupling effects in some (a)symmetrical edge-coupled V-shape and trapezoidal microshield transmission lines (MTLs) are studied. The hybrid effects of different geometrical parameters of the MTLs and the permittivity of the filling materials on the coupling ...
B. Guo, X.T. Dong, W.Y. Yin, Y.B. Gan
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IEEE Transactions on Microwave Theory and Techniques, 1970
This paper consists of two parts. In Part I, coupled-mode theory is employed to determine the effects of reflection at the various ports and unequal inductive and capacitive coupling coefficients on the coupling and directivity of two coupled lines.
M.K. Krage, G.I. Haddad
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This paper consists of two parts. In Part I, coupled-mode theory is employed to determine the effects of reflection at the various ports and unequal inductive and capacitive coupling coefficients on the coupling and directivity of two coupled lines.
M.K. Krage, G.I. Haddad
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Novel slow-wave coupled lines with coupling enhancement
2011 IEEE MTT-S International Microwave Symposium, 2011A novel coupled line structure is studied based on two layers of crossing strips with dense interconnecting vias. The two arrays of vias resembling fence walls in substrate integrated waveguides help enhance the inductive coupling significantly. Dispersion characteristics of both odd and even modes are investigated with emphasis on phase equalization ...
Haijiang Ma, H.Y. David Yang
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Coupled-Mode Analysis of Nonuniform Coupled Transmission Lines
IEEE Transactions on Microwave Theory and Techniques, 1969The transmission-line equations describing propagation along coupled transmission lines are cast in coupled-mode form so that the roles of the different coupling coefficients and the impedance variation are more directly observable. Restrictions on the various parameters for obtaining directional coupling with nonuniform lines are then discussed and ...
J.E. Adair, G.I. Haddad
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Josephson Transmission Lines Coupling
1991The problem of the matching of a Josephson transmission line (JTL) to external loads presents noticeable difficulties because of the complexity of the nonlinear wave-propagation that takes place in this spatially distributed structure. In a continuum-limit approximation, the equation for a JTL is a sine-Gordon equation containing loss and forcing terms
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IEEE Transactions on Microwave Theory and Techniques, 1966
A new class of coupled-transmission-line directional couplers, called "nonsymmetrical directional couplers," is described. Unlike conventional directional couplers, nonsymmetrical directional couplers use coupled lines of unequal characteristic impedances.
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A new class of coupled-transmission-line directional couplers, called "nonsymmetrical directional couplers," is described. Unlike conventional directional couplers, nonsymmetrical directional couplers use coupled lines of unequal characteristic impedances.
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Coupled-cavity coupled-line TWT
1973 International Electron Devices Meeting, 1973H.E. Brown, L.M. Winslow
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Field coupling to nonuniform coupled microstrip transmission lines
International Journal of RF and Microwave Computer-Aided Engineering, 2003An efficient method for frequency-domain and transient analysis of the nonuniform lossless coupled microstrip transmission lines excited by external electromagnetic waves is presented. The nonuniform coupled microstrip transmission lines system is first decomposed into a large number of uniform sections called steplines.
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