WHAT IS THE DOUBLE WAVEGUIDE DIRECTIONAL COUPLER

Double waveguide directional coupler is the most simple waveguide directional coupler. The main and auxiliary waveguides are realized by the coupling of two g0/4 (2n+1) d= (n=0) small holes on the common narrow wall, and the G0 is the wave guide wavelength which is the center frequency, and the n is a positive integer. Coupling holes are generally circular, can also be other shapes. When working in the center frequency, d= beta PI /2, when D approaches infinity; when the deviation from the center frequency, SEC beta D has a certain value, the D no longer is infinite. In fact, even in the double coupler center frequency, its orientation is not infinite, but only about 30dB.

In short, double waveguide directional coupler is a directional output depends on mutual interference wave and the realization of the main waveguide, coupling phase in the mouth in the mouth of superposition, isolated phase offset. In order to increase the coupling degree of the directional coupler and widen the working frequency band, the multi hole directional coupler can be used.