Double-Sided Board Waveguide Shape for Low-Loss Compact Routing
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Solution Overview
Problem
The increase in waveguide length to reduce signal loss constrains the size reduction of double-sided boards.
Innovation Solution
A waveguide configuration with larger lateral lengths at the longitudinal ends and a central part, allowing for reduced longitudinal length while maintaining low transmission loss, achieved through a specific manufacturing process involving drills of varying diameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the longitudinal length of the waveguide is increased to reduce signal loss, then the transmission loss decreases, but the size of the double-sided board increases
Solution Approach 1:
The waveguide cross-section is designed with non-uniform lateral length along the longitudinal direction, with end parts having larger lateral lengths than the central part. This local variation in dimensions optimizes the electromagnetic field distribution and reduces transmission loss without requiring increased overall longitudinal length, thereby resolving the contradiction between signal loss reduction and size minimization.
Solution Approach 2:
The lateral length parameter of the waveguide cross-section is varied along the longitudinal direction, creating a tapered or expanded end structure. This parameter change allows the waveguide to achieve lower transmission loss at the same longitudinal length by improving field confinement and reducing discontinuity effects at the ends, thus reducing the board size while maintaining low loss.
2Loss of energy
If the lateral length of the waveguide end parts is increased to lower the transmission loss frequency, then the transmission loss decreases, but the manufacturing complexity increases
Solution Approach 1:
The waveguide structure is segmented into distinct regions: a central part with one lateral length and end parts with larger lateral lengths. This segmentation allows each region to be optimized independently for its function while using standardized manufacturing techniques for each segment, reducing overall manufacturing complexity despite the varied geometry.
Solution Approach 2:
The solution addresses the transmission loss problem by modifying the waveguide dimensions in the lateral dimension rather than increasing the longitudinal length. This dimensional change achieves the desired electrical performance while maintaining a compact longitudinal footprint, simplifying the manufacturing process as it involves standard routing and drilling operations.
Data Source
AI summary
A double-sided board includes a first-type conductor layer, a second-type conductor layer, a waveguide-filled dielectric layer and a waveguide. The waveguide-filled dielectric layer is a dielectric layer provided between the first-type conductor layer and the second-type conductor layer. The waveguide is provided in such a manner as to penetrate the waveguide-filled dielectric layer in a direction from one of the first-type conductor layer and the second-type conductor layer to the other of the two conductor layers. A cross section of the waveguide in a plane parallel to the first-type conductor layer has a longitudinal direction and a lateral direction perpendicular to the longitudinal direction. The cross section of the waveguide has, along the longitudinal direction, a central part and two end parts located respectively on two sides of the central part. A lateral length of each of the end parts is larger than a lateral length of the central part.