Waveguide Switch Rotating Cylinder EMI Gasket Isolation
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Solution Overview
Problem
Existing waveguide switches have limited signal isolation, leading to leakage of high power transmit signals into sensitive receive chains, which degrades performance, and current methods for achieving high isolation are either time-consuming, costly, or difficult to implement in harsh environments.
Innovation Solution
A high isolation waveguide switch design featuring a rotating cylinder with planar interface and multiple EMI gaskets and ribs for 90-degree indexing, allowing manual or mechanical operation without disassembly, providing up to 120 dB isolation by compressing gaskets for maximum shielding effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional rotating cylinder waveguide switches are used, then the switch can be reconfigured easily, but the signal isolation between switch positions is limited to 60-80 dB
Solution Approach 1:
The waveguide enclosure is divided into multiple isolated chambers separated by partition walls with EMI gaskets. Each chamber contains a portion of the rotating cylinder, and the partition walls create electromagnetic barriers that prevent signal leakage between adjacent chambers, achieving 110-120 dB isolation while maintaining rotational switching capability
Solution Approach 2:
EMI gaskets are introduced as intermediary shielding elements at the interfaces between rotating and stationary portions, and between adjacent chambers. These gaskets act as electromagnetic mediators that block signal leakage while allowing mechanical movement, achieving high isolation without compromising the switching mechanism
2Object-affected harmful factors
If waveguide sections are bolted together to achieve high isolation, then signal isolation becomes extremely robust, but the time necessary to reconfigure the system increases substantially
Solution Approach 1:
The invention transforms the static bolted waveguide connection into a dynamic rotating cylinder mechanism within an enclosed chamber. The rotating cylinder can be quickly rotated to different positions (0°, 90°, 180°, 270°) to change signal paths, providing both high isolation through enclosure and rapid reconfiguration without disassembly
Solution Approach 2:
The rotating cylinder is nested within the waveguide enclosure, with the cylinder containing internal waveguide paths and the enclosure providing external shielding. This nested structure allows the compact switching mechanism to achieve high isolation while maintaining quick rotational reconfiguration capability
3Object-affected harmful factors
If four waveguide switches are stringed together to provide high isolation, then isolation values of 110-120 dB can be achieved, but the device complexity and real estate requirements increase
Solution Approach 1:
Multiple switching functions are merged into a single enclosed waveguide switch assembly. The rotating cylinder with multiple ports and internal waveguide paths combines the functionality of multiple separate switches, while the common enclosure provides unified EMI shielding, achieving high isolation with reduced complexity and space requirements
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
The solution enables efficient reconfiguration of waveguide switches with high isolation without tools, ensuring reliable performance in harsh environments and reducing setup time, while being cost-effective and easy to operate.
Implementation Method 1
The interface between the outer housing and inner cylinder is the curvature of the cylinder. By definition, these prior art switches require a gap so the cylinder can rotate in the housing. This gap is the reason isolation is limited to levels such as 60 dB for Ku Band
Implementation Method 2
The enclosure has a waveguide port on each side, and the cylinder has paths milled into it to direct the RF energy from port to port
Data Source
AI summary
Embodiments of the invention are directed to a high isolation waveguide switch that can either be manually or mechanically operated. Operation proceeds by loosening a fastener, which draws a rotor portion of the switch away from a stator portion; rotating the rotor by 90 degrees; and tightening the fastener, pushing the rotor into contact with the stator and completing connections to the waveguide ports. Gaskets may provide EMI shielding and ensure port-to-port isolation.