| 摘要 |
PURPOSE:To improve the degree of separation and to prevent the group delay frequency characteristics, by inserting a spacer interrupting a wave of a high frequency between a coupling slot branching a wave of a low frequency and a connection waveguide. CONSTITUTION:Waves orthogonal with each other are propagated in a main waveguide 1. In this case, a system branching the low frequency wave, i.e. the coupling slot 2a and a short-circuit plate 3a generate the TM mode. It is possible through this TM mode that the wave orthogonal to an electric field 5a is excited in the connection waveguide 4a. Relating to the spacer 6 connecting the coupling slot 2a and the connection waveguide 4a, the size toward the electric field 5a of the spacer 6 is taken as <=1/2 of the wavelength of the wave of a high frequency. Thus, the wave of the high frequency is interrupted in the direction orthogonal to the electric field 5a. Then, the wave of the high frequency is not propagated to the connection waveguide 4a. The length of the spacer 6 is selected to a length through which the wave of the high frequency is attenuated sufficiently and the matching with the connection waveguide 4a is done in excellent way. |
