Dual-Band Waveguide Duplexer With Shared Junction Filter Layout
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Solution Overview
Problem
There is a need for small-scale duplexers that can operate with high power and maintain temperature stability in high-frequency bands, particularly in wireless relay devices, and there is a demand for dual-band structures using a single filter.
Innovation Solution
A dual-band waveguide filter and duplexer are designed with integrated filters for outputting two or more bands, utilizing a single waveguide filter that includes an input and output common junction and spaced apart filters connected by these junctions, with resonance blocks having predetermined depths and widths, and an opening portion between them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple filters are used to achieve dual-band operation, then frequency coverage is improved, but device size and complexity increase
Solution Approach 1:
The patent combines multiple filters into a single integrated waveguide filter structure. The first and second filters are positioned side-by-side within the same waveguide housing, sharing common input and output junctions, thereby achieving dual-band operation while reducing overall device complexity and size.
Solution Approach 2:
The waveguide filter is designed to perform multiple functions simultaneously - it handles both first-band and second-band signals through a single structure with shared input common junction and output common junction, making the device universal for dual-band communication systems.
2Volume of moving object
If filter elements are placed closer together to reduce size, then compactness is improved, but signal interference between bands increases
Solution Approach 1:
The patent introduces an isolation structure (partition wall) as an intermediary element between the first and second filters. This partition wall physically separates the two filter paths while allowing compact arrangement, thereby preventing signal interference between bands while maintaining reduced device size.
3Power
If high-power operation is required, then transmission capability is improved, but temperature stability becomes more difficult to maintain
Solution Approach 1:
The patent employs temperature compensation by adjusting the physical dimensions (length and width) of the waveguide sections and filter resonators. By carefully controlling these geometric parameters, the filter maintains stable frequency characteristics across temperature variations even during high-power operation.
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 the dual-band waveguide filter to transmit two filter bands efficiently, providing temperature stability and high power operation, while allowing for various implementations of filter stages.
Implementation Method 1
two filters positioned to be spaced apart from each other at a predetermined gap... each including a plurality of resonance blocks... each resonance block including a resonance groove provided in the form of a groove having a predetermined depth
Data Source
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AI summary
One embodiment of the present disclosure provides a dual-band waveguide filter including: a filter housing; an input common junction including an input port hole positioned at one side of the filter housing; an output common junction including an output port hole positioned at the other side of the filter housing and positioned to be opposite to the input port hole; and two filters positioned to be spaced apart from each other at a predetermined gap in an alignment direction of the input port hole and the output port hole in the filter housing and connected by the input common junction and the output common junction, in which a signal is inputted to the input port hole, and a signal is outputted from the output port hole.