Microwave Multiplexer Interconnect Spacing Optimization
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Solution Overview
Problem
Conventional microwave multiplexing network designs face challenges in increasing filter rejection and bandwidth without adding extra hardware, particularly in weight-sensitive satellite applications, where higher order filters increase size and weight.
Innovation Solution
The method involves optimizing interconnect spacing and filter-to-interconnect values to introduce an additional real reflection zero into the passband, effectively increasing the filter order without adding extra hardware, by determining specific distances between coupling elements and the interconnect surfaces to enhance channel performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the order of the filter is increased to improve rejection and bandwidth, then filter performance is enhanced, but the size and weight of the multiplexer increase
Solution Approach 1:
The patent changes the physical parameters of the existing filter structure by optimizing cavity dimensions, coupling element positions, and interconnect spacing to achieve higher effective filter order and improved rejection performance without adding more resonators, thereby avoiding increased weight
2Reliability
If the order of the filter is increased to expand bandwidth, then filter bandwidth is improved, but the size of the multiplexer increases
Solution Approach 1:
The patent optimizes parameters such as cavity lengths, coupling iris dimensions, and spacing between components to achieve higher filter order and expanded bandwidth within the same physical footprint, avoiding area increase
3Reliability
If conventional design techniques are used to achieve increased filter rejection, then rejection is improved, but the filter order must be increased which adds hardware
Solution Approach 1:
The patent achieves increased filter rejection by optimizing the parameters of existing components including cavity resonator dimensions, coupling element positions and sizes, and interconnect spacing, rather than adding more resonators or increasing filter order through additional hardware
Solution Approach 2:
The patent uses the interconnect structure as an intermediary element that, when optimally positioned and dimensioned, provides additional rejection mechanism without requiring extra filter resonators, effectively using the interconnect as a passive filtering element
Data Source
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AI summary
A method for configuring a microwave multiplexing network having a first channel filter (14) and a second channel filter (16) and an interconnect (18,20) in order to improve channel performance. The top ends of the first and second channel filters are coupled to the closer of the top and bottom surfaces of the interconnect according to interconnect spacing values and filter to interconnect values. Interconnect values and filter to interconnect values are determined by selecting interconnect spacing values and filter to interconnect values to ensure that a pole is formed causing an additional real reflection zero to be brought into the passband of the microwave multiplexing network thereby increasing the filter order by one. Then interconnect spacing values and filter to interconnect values as well as the internal filter dimensions are selected to ensure that the return loss of the microwave multiplexing network is less than a predetermined return loss level.