| 摘要 |
<p>A band pass filter that handles milli-wave zone signals is formed as a plurality of types, for example two types, of band pass filter having mutually differing wavelength properties by means of sandwiching in a state parallel to the E plane of a waveguide (2) a thin metal plate (1) wherein a plurality of square holes (4a, 4b) having differing sizes and spacing corresponding to a wavelength band that is allowed to pass through by means of the waveguide (2), which is bisected by the center of an H plane, are bored in a plurality of rows, for example two rows. Furthermore, as a switching mechanism that switches which waveguide to cause to operate as a band pass filter, screw holes (A, A, B, B) that can thread to screws that form a reflective rod (3) for suppressing input/output of a signal to another waveguide are bored at both ends of each of the plurality of rows, for example two rows, of waveguides for connecting to the signal input/output terminals of an external circuit. As a result, it is possible to provide a variable-frequency band pass filter that can switch between a plurality of types of band pass filter.</p> |
