Non-blocking Switch Matrix Segmentation for RF Performance
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Solution Overview
Problem
Conventional non-blocking switch matrices face performance degradation and increased cable complexity when scaling beyond 6-8 ports, leading to limitations in RF frequency, loss performance, and space requirements for higher port dimensions.
Innovation Solution
The implementation of a N×M non-blocking switch matrix using smaller dimensioned m/2-way and n/2-way multiport switches at the input and output stages, respectively, with a high-performance transfer stage to maintain connectivity and performance, reducing the number of coaxial cables needed between chassis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional non-blocking switch matrices use N*M coaxial cables to connect input and output ports, then non-blocking connectivity is achieved, but the number of cables increases prohibitively and space requirements become excessive for large N and M
Solution Approach 1:
The switch matrix is segmented into multiple smaller sub-matrices or modules. Instead of using a single large N×M switch matrix that requires N*M cables, the system divides it into smaller blocks (e.g., 4×4 sub-matrices in a 12×12 configuration), reducing the cable count within each module and allowing for more manageable cable routing.
Solution Approach 2:
The patent introduces a third dimension by stacking multiple switch matrix planes or layers. Multiple 4×4 sub-matrices are arranged in layers (e.g., three layers for a 12×12 matrix), allowing signals to route through different spatial planes. This dimensional approach reduces the number of cables needed within each plane while maintaining overall non-blocking connectivity across the full N×M matrix.
2Adaptability or versatility
If the dimensions N and M of a non-blocking switch matrix are increased beyond 6-8 ports, then more input/output connections are available, but severe performance degradation occurs in RF frequency, loss, VSWR, and isolation
Solution Approach 1:
The large N×M switch matrix is divided into smaller sub-matrices (e.g., 4×4 blocks within a 12×12 matrix). Each sub-matrix operates independently with fewer ports, maintaining superior RF performance characteristics. The segmentation allows each small sub-matrix to achieve optimal VSWR, isolation, and loss performance while the overall system provides large port dimensions through modular composition.
Solution Approach 2:
Multiple smaller switch matrix sub-units are nested or stacked together to form the larger N×M matrix. For example, twelve 4×4 sub-matrices can be nested in a 3×3 arrangement to create a 12×12 matrix. This nesting allows the system to achieve large port dimensions while each nested unit maintains excellent RF performance, avoiding the degradation that would occur in a single large matrix.
3Adaptability or versatility
If more coaxial cables are routed between chassis to accommodate larger switch matrices, then more ports can be connected, but cable routing becomes difficult and space requirements increase
Solution Approach 1:
The switch matrix is segmented into modular sub-units that can be distributed across multiple chassis. Each chassis contains one or more small sub-matrices with limited cable connections, simplifying cable routing within each chassis. The modular segmentation reduces the number of cables that must be routed between chassis compared to a monolithic large matrix.
Solution Approach 2:
The patent utilizes vertical stacking of multiple switch matrix planes to reduce horizontal cable routing complexity. By arranging sub-matrices in stacked layers (z-dimension), the system reduces the number of cables that must traverse between chassis horizontally. Signals can route through different vertical planes, reducing the burden on inter-chassis cable routing while maintaining full connectivity.
Data Source
AI summary
A N×M non-blocking switch matrix, where N and M are integers, includes an input stage having a plurality of m/2-way multiport switches, where quotient m/2 is a positive integer less than M, and an output stage having a plurality of n/2-way multiport switches, where quotient n/2 is a positive integer less than N. The switch matrix further includes a transfer stage having a plurality of transfer switches operatively connected between the input stage and output stage, and selectively applying outputs of the m/2-way multiport switches to inputs of the n/2-way multiport switches such that any given input to the m/2-way multiport switches is connectable to any given output of the n/2-way multiport switches.