## Microwave Transmission Line CouplersA reference for the engineer interested in the design procedure. Covers practical considerations with complete design examples. The appendices contain two simple computer programs for the analysis of symmetrical three and four-port networks, and coupled-line configuration applications for replicatio |

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analysis band center bandwidth branch branch-line coupler calculated Capacitor cascade matrix characteristic impedance Chebyschev Computer screen display cos0 cosh coupled lines coupled-line couplers coupled-line section coupling coefﬁcient cross section dB BW dB R dB deﬁned Design Example Dielectric constant dimensions directional couplers element values equiripple equivalent circuit even-mode network ﬁnd ﬁrst fringing capacitances function given GOSUB GOTO hybrid ring hybrid-ring IEEE IEEE Trans impedance levels Inductor Lange coupler Linewidth Malherbe microstrip lines Microwave Theory Tech mode impedance MODE NETWORK mutual capacitance obtained odd mode odd-mode impedances odd-mode network pair of coupled polynomial power split PRINT PRINT PRINT properties prototypes ratio realization reﬂection coefﬁcient REM REM Resistor response S-parameter scattering parameters shown in Figure shunt single-section speciﬁc stripline substrate SYMFOUR symmetrical network SYMTHREE synthesis procedure Table tan0 thickness tight coupling transmission coefﬁcients transmission line unit elements voltage VSWR wideband width Wilkinson power divider zero