A first quarterwavelength portion extending in one direction from the signal source or feed point and a second quarterwavelength extending in the opposite direction from the signal source.
Two arms of the interferometer are different in length by one -quarter of a guide wavelength, allowing the device to operate at its optimal linearity point without external electrical bias.
干涉仪的两个臂长相差波导波长的四分之一，使器件在最佳线性点工作，无需外加电偏压。
3
Realize the way of broaden the band-width through making holes in the back of quarter-wavelength horn, and optimize the size of holes;