By G. Engen
This e-book presents an intensive figuring out of the microwave circuit version and its boundaries
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Additional info for Microwave Circuit Theory and Foundations of Microwave Metrology
39) For a more complete discussion see, D. M. KERNS: 'Basis of the application of network equations to waveguide problems', / . Res. Nat. Bur. Stand, vol. 42, pp. 515-540, May, 1949 Multi-port boundary conditions 31 Thus Smn = Snm provided that ZH = Z^, which assumes that the same choices of characteristic impedance have been made for all terminals or ports. 40) where the characteristic Z 0 1 and Z 0 2 obtain at terminals 1 and 2 respectively. Finally, with regard to the assumed properties of the media which is included in the multi-port structure, it should be noted that these are well satisfied for a large range of materials.
It is to this composite signal that bz is proportional. The feedback action may thus be visualised as one Amplitude stabilisation and multi-channel isolation 47 which so adjusts the amplitude of the wave transmitted by the modulator that, when added to the 're-reflected' wave from the termination, the magnitude of their sum is constant. In an actual application, the feedback loop is generally called on to compensate for fluctuations in generator amplitude and, because of nonideal characteristics of the other components, for changes in the reflection coefficient of the termination on port 2.
Thus P 3 will be constant and no action is required by the feedback loop. Next let a tuner, of substantial reflection, be inserted between the modulator and coupler. At this point, if a strongly reflecting termination is substituted for a matched one on port 2, there would be, except for the feedback action, a change in Ps. To be more specific, bz now includes a component which has been first reflected by the termination, then re-reflected by the tuner and finally added to the emerging wave from the modulator.