π-Type band pass filter

.pi.-Loop phase bit apparatus

.pi.-section digital phase shifter apparatus

1-100 GHz microstrip filter

180 degree phase shifter bit

180° phase shift circuit having an improved isolation...

180-degree phase shifter

180.degree. PHASE SHIFTING APPARATUS

3D MMIC balun and methods of making the same

4:1 Balun

6-elements ladder type piezoelectric filter

90 degree phase shifter

90.degree. phase shifter apparatus and method using a directly c

Absorption circuit

Absorptive resonant cavity filter

AC integrated coupler with phase equalizer

AC line filter

AC line filter

AC line filter with tapped balun winding

AC noise spike suppression circuit with parallel back-to-back fa