Patent ID: 7978022

Claim:
A cable to waveguide transition apparatus having a signal accumulation form of a backshort, comprising: a waveguide for propagating a signal; a RF probe of a cable for transferring a radio frequency (RF) signal to the waveguide; and a backshort of the waveguide having the signal accumulation form for reflecting the RF signal excited from the RF probe to a location of the RF probe, wherein the backshort reflects a first fundamental frequency signal excited from the RF probe to have a phase identical to a phase of a second fundamental frequency signal excited from the RF probe to an aperture of the waveguide, and reflects a first 2-order harmonic frequency signal excited from the RF probe to have a phase reverse to a phase of a second 2-order harmonic frequency signal excited from the RF probe to an aperture of the waveguide in order to eliminate the 2-order harmonic frequency signal.