Patent ID: 7332982
Filing Date: 2008-02-19
Classification: H01P

Abstract:
1. A waveguide diplexer, comprising: a waveguide having a predetermined shaped cross section; a transmitting filter, one end of which coupled to an output port of the waveguide and the other end coupled to an electric plane T-junction, for preventing to generate a harmonic band and a higher mode in a receiving band by changing impedance to have a low pass characteristic inside the waveguide; a receiving filter, one end of which coupled to an input port of the waveguide and the other end coupled to the electric plane T-junction, for minimizing an insertion loss by changing impedance to have a bandpass characteristic inside the waveguide; the electric plane T-junction, one end of which coupled to an input/output port of the waveguide, for isolating/combining the transmitting signal and the receiving signal without electric interference by connecting the transmitting filter and the receiving filter, and minimizing interference of a frequency transmitted/received through the transmitting filter and the receiving filter; and an impedance converter for differentiating the output port and the input port with minimum electric interference to the transmitting filter and the receiving filter by changing the impedance, wherein the transmitting filter includes a plurality of corrugations having different impedances for having a low pass characteristic by alternatively controlling the impedance to be higher or to be lower in order to prevent generating a higher mode and a harmonic band, wherein the minimum gap among a plurality of the corrugations handles maximum electric power.