Waveguide filters, transmitters, and radar

Abstract

To provide a waveguide filter that can improve power durability.SOLUTION: A waveguide filter includes at least one waveguide resonator that resonates radio waves in a TE mode, a coupling window is formed in the waveguide resonator to which a waveguide line for input or output is connected, the coupling window extends in the longitudinal direction, and has a shape in which the center of at least one of the two long sides facing each other in the short direction is further away from the other long side than both sides.SELECTED DRAWING: Figure 2

Claims

1. It comprises at least one waveguide resonator that resonates radio waves in TE mode, The waveguide resonator has a coupling window to which an input or output waveguide line is connected. The aforementioned connecting window extends in the longitudinal direction, and of the two opposing long sides in the short direction, at least one of the long sides has a shape in which the central part of the long side is further away from the other long side than the sides thereof. The waveguide-type resonator is defined by a pair of opposing H-planes and an E-plane connected to the edges of the H-planes and surrounding the H-planes. The coupling window is formed between the center and edge of the H surface. Waveguide filter.

2. The two long sides extend along the edge between the center and the edge of the H surface, The coupling window has a shape in which the central part of the longer side of the two longer sides that is closer to the center of the H-plane protrudes toward the center of the H-plane. Waveguide filter according to claim 1.

3. The H surface is formed in a rectangular shape having four sides, The coupling window is formed on the H surface in a range from the end along one of the four sides to one-third of the length of the side. Waveguide filter according to claim 1.

4. The direction of the electric field in the waveguide-type resonator is different from the direction of the electric field in the waveguide-type transmission line. Waveguide filter according to claim 1.

5. The maximum width of the coupling window in the short-side direction is greater than the distance between the pair of H-planes of the waveguide resonator. Waveguide filter according to claim 1.

6. The coupling window is formed in a T-shape or a + shape. Waveguide filter according to claim 1.

7. The coupling window is formed in a straight line from the central part to both sides. Waveguide filter according to claim 1.

8. The aforementioned connecting window is formed in a triangular or rhomboid shape. Waveguide filter according to claim 1.

9. A transmitter comprising the waveguide filter described in claim 1.

10. A radar comprising the waveguide filter described in claim 1.

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