High Frequency Module Single Cavity Spatial Isolation
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Solution Overview
Problem
Conventional high frequency package structures are costly and complex, with reliability issues due to the need for multiple members and complicated manufacturing steps, and fail to provide effective spatial isolation in high frequency bands like the millimeter band, requiring expensive absorbers.
Innovation Solution
A high frequency module with a single cavity using a waveguide aperture and end-short-circuited dielectric waveguide operates as a reflection circuit to ensure spatial isolation between high frequency circuits, eliminating the need for expensive seal rings and cover members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional package structures with multiple members (seal rings, cover members) are used to provide spatial isolation, then shielding effectiveness is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines multiple isolation functions into a single cavity structure. The cavity integrates the shielding function that would otherwise require separate seal rings and cover members, eliminating the need for multiple discrete components while maintaining spatial isolation between high frequency circuits.
Solution Approach 2:
The cavity serves multiple functions simultaneously: it provides electromagnetic shielding, defines the physical boundary for circuit mounting, and creates the isolated environment needed for high frequency operation. This multi-functional design replaces what would traditionally require multiple specialized components.
2Object-affected harmful factors
If conventional package structures with multiple members are used, then shielding effectiveness is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines multiple isolation functions into a single cavity structure. The cavity integrates the shielding function that would otherwise require separate seal rings and cover members, eliminating the need for multiple discrete components while maintaining spatial isolation between high frequency circuits.
Solution Approach 2:
The invention uses a simple cavity structure that can be manufactured more economically than complex multi-component packages. The design accepts that the cavity is a basic structure that needs to be precisely formed, but eliminates the need for expensive additional shielding components and complex assembly processes.
3Object-affected harmful factors
If physical shielding structures are used in high frequency bands, then isolation is improved, but the structure becomes complex and expensive
Solution Approach 1:
The patent combines multiple isolation functions into a single cavity structure. The cavity integrates the shielding function that would otherwise require separate seal rings and cover members, eliminating the need for multiple discrete components while maintaining spatial isolation between high frequency circuits.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration provides effective spatial isolation between high frequency circuits at an affordable cost, preventing signal feedback and coupling, and ensuring stable operation in the microwave and millimeter bands.
Implementation Method 1
the waveguide aperture and the end-short-circuited dielectric waveguide are caused to operate as a reflection circuit for signals that propagate through the cavity
Implementation Method 2
an end-short-circuited dielectric waveguide 40 extending in a direction of lamination of the multilayer dielectric substrate 2
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
A cavity 5 that is configured by electrically connecting an earth conductor 4 that is formed on a multilayer dielectric substrate 2 and on which a plurality of high frequency circuits 10, 11, and 12 are mounted, and a shield cover member 3; a waveguide aperture 30 that is formed on the earth conductor 4 on which the high frequency circuits 10, 11, and 12 are mounted and that is electrically coupled to the cavity 5; and an end-short-circuited dielectric waveguide 40 that is formed in a direction of layer lamination of the multilayer dielectric substrate 2, is connected to the waveguide aperture 30, and has a length approximately 1/4 of an effective wavelength in the substrate of a signal wave are included, and spatial isolation between the high frequency circuits is ensured by an inexpensive and simple configuration using the single cavity.