Waveguide-Microstrip Converter Layout for Radiation Suppression
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Solution Overview
Problem
Conventional waveguide-microstrip line converters experience significant radiation issues due to the straight configuration of connection conductors, leading to increased wave radiation at the connection points between the microstrip line and waveguide.
Innovation Solution
The waveguide-microstrip line converter features a dielectric substrate with a strip conductor, a conductor plate, and ground conductor, where connection conductors are arranged with a narrower distance between them near the connection point, reducing the post wall waveguide cross-section and minimizing radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the post wall waveguide cross section is made large, then the waveguide-microstrip line converter can handle higher power, but radiation from the connection portion increases
Solution Approach 1:
The connection conductors are configured with different spacing at different locations: narrower spacing near the connection portion and wider spacing elsewhere. This local variation in geometry allows the structure to maintain high power handling capability overall while specifically suppressing radiation at the critical connection region where the microstrip line meets the waveguide.
Solution Approach 2:
The connection conductors are arranged in a curved or non-linear pattern rather than a straight line, with the distance between adjacent conductors varying along their length. This curved configuration with variable spacing creates a more compact effective cross-section at the connection portion, reducing the radiation aperture while maintaining the overall waveguide dimensions for power handling.
2Ease of manufacture
If the connection conductors are arranged in a straight line, then the structure is simple to manufacture, but radiation from the connection portion cannot be suppressed
Solution Approach 1:
The connection conductors follow a curved path rather than a straight line, with the curvature and spacing specifically designed to reduce the effective cross-sectional area at the connection portion. This curved arrangement suppresses radiation while remaining manufacturable using standard PCB or metalization techniques.
Solution Approach 2:
The connection conductors have non-uniform spacing along their length, with narrower spacing specifically at the connection portion and wider spacing in other regions. This localized geometric variation targets the radiation problem at the critical connection region while maintaining manufacturing feasibility through standard fabrication processes.
3Reliability
If the distance between connection conductors is uniform, then the impedance matching is easier to achieve, but radiation increases at the connection portion
Solution Approach 1:
The connection conductors are designed with non-uniform spacing where the distance between adjacent conductors varies along their length. The spacing is specifically narrowed at the connection portion to suppress radiation, while other regions maintain larger spacing that is compatible with impedance matching requirements. This localized geometric optimization resolves the contradiction between radiation suppression and impedance matching.
Data Source
AI summary
Provided is a waveguide-microstrip line converter, including: a waveguide; a dielectric substrate that is connected to cover one end of the waveguide; a strip conductor that is disposed on a front surface of the dielectric substrate; a conductor plate that is disposed the front surface of the dielectric substrate, and connected to the strip conductor; a ground conductor that is disposed on a rear surface of the dielectric substrate; and a plurality of connection conductors that connect a periphery of the conductor plate and the ground conductor, in which: the ground conductor has an opening formed therein in a connection region; the strip conductor and the ground conductor forma microstrip line; and the plurality of connection conductors are arranged so that a distance between two lines of the plurality of connection conductors that are aligned in a longitudinal direction of the microstrip line, and disposed on both opposing sides of the conductor plate in a vicinity of a connection portion is narrower than a distance therebetween in a vicinity of the opening.