Patent ID: 9153851
Filing Date: 2015-10-06
Classification: H01P

Abstract:
1. A waveguide converter comprising: a waveguide which includes a hollow section through which a signal is transmitted and a first opening formed on a cross section of the hollow section in a direction orthogonal to a transmission direction of the signal; and a circuit board which includes on a same surface a signal line, a conductor patch connected to the signal line, and a second opening surrounding the conductor patch, the waveguide being adhered and fixed onto the circuit board in such a manner that the first opening surrounds the second opening, wherein the conductor patch includes a rectangular section, a first protruding portion and a second protruding portion, the rectangular section has short sides in a direction parallel to short sides of the first opening, and has a first long side and a second long side in a direction parallel to long sides of the first opening, the second long side being connected to the signal line, and the first and second protruding portions are provided so as to touch the short sides of the rectangular section near both ends of the second long side, respectively, a resonance frequency that degrades a pass characteristic of the signal between the waveguide and the signal line is determined using at least the length of a first straight line, the first straight line is drawn a center frequency of an active frequency band in the waveguide converter is determined using the length of a second straight line, the second straight line is drawn from a point at which the center line intersects with the second long side to a point at which the first long side intersects with a short side of the rectangular section, and the first straight line is longer than the second straight line.