Microstrip power equalizer with great equal range

A great equal range microstrip power equalizer was studied and a kind of circuit topology was proposed. In the circuit, the parallel stub resonator was used to get bandstop effect, and the resistor was used to modify the attenuation character. Furthermore, a compact structure was employed. Using the above circuit topology, an attenuation curve of equal range up to 20 dB was fulfilled to satisfy a traveling wave tube(TWT) covering X and Ku frequency band. The simulation and its implementation have been carried out. The measured results of the equalizer agree with the simulation results very well. The equalizer has the characteristic of wide bandwidth, great equal range and compact size．