| 摘要 |
A microstripline microwave mixer circuit includes a waveguide microstrip filter formed by coupling a section of ridged waveguide to a microstripline circuit. The ridged waveguide based microstrip filter both serves as a high-pass filter for RF input signals and also provides a suitable termination for the RF input side of the mixer circuit resulting in a compact multifrequency mixer circuit with good performance. The section of ridged waveguide is coupled to the microstripline circuit such that the dielectric substrate of the microstripline circuit is within the waveguide section thereby increasing the effective dielectric constant of the waveguide interior and decreasing the dimensions of the waveguide. This configuration of the high-pass filter presents a smaller component than would be present in air-filled waveguide mixer circuits.
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