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The characteristics of certain bridged‐T filter structures have been investigated theoretically and an experimental confirmation of this theory at u.h.f. has been obtained. In theory it is possible to obtain infinite attenuation at a designated frequency, while retaining essentially the same band width as that for the uncompensated filter. A model has been constructed which has a band width of ½ Mc/sec. at 3000 Mc/sec. with an attenuation at center frequency of over 70 db. This is to be compared with the attenuation from a similar uncompensated filter of 20 db. Certain other known filter expressions have also been reduced to forms readily utilizable at these frequencies. Their utility for u.h.f. applications is discussed. The distortion produced in otherwise rectangular pulses of short duration has been investigated both theoretically and experimentally. Curves are presented which show the resultant wave form as a function of the tuning of the filter.