Power standing wave ratio Standing wave ratio

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however correspond 1 type of measurement of swr using formerly standard measuring instrument @ microwave frequencies. slotted line involves waveguide (or air-filled coaxial line) in small sensing antenna measures electric field along transmission line directly. electric field strength commonly measured using crystal detector or schottky barrier diode. these detectors have square law output low levels of input. readings therefore corresponded square of electric field along slot, e(x), maximum , minimum readings of emax , emin found probe moved along slot. ratio of these yields square of swr, so-called pswr.


moreover, 1 can compare dielectric losses @ different positions along transmission line. badly matched load results in standing wave, i.e. pattern of high , low electric field in line. sections of line exposed higher dielectric heating other sections. pswr ratio of dielectric losses @ maxima , minima along line. pswr equal 1 means transmission line loaded homogeneously, while high pswr


may lead hot spot formation , evenetual thermal destruction of line.








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