RF Dielectric Waveguide Duplexer Filter Module Design
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Solution Overview
Problem
Current RF dielectric combline duplexers are smaller in size but lack the performance of air cavity filters, while air cavity duplexer filters are too large, necessitating a compact solution that maintains performance.
Innovation Solution
An RF dielectric waveguide duplexer filter module is designed with stacked and side-by-side blocks of dielectric material, covered with conductive material, featuring direct and cross-coupling RF signal transmission paths to achieve compact size and performance comparable to air cavity filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If air cavity duplexer filters are used, then performance is improved, but size becomes too large
Solution Approach 1:
The patent changes the fundamental operating parameters by transitioning from air cavity resonance to dielectric waveguide modes. By using dielectric material with high permittivity, the electromagnetic wavelength is reduced, allowing the same filtering performance to be achieved in a much smaller physical volume. The waveguide structure supports specific modes (TE10, TE20, etc.) that provide the necessary frequency selectivity in a compact form factor.
Solution Approach 2:
The invention employs composite construction combining dielectric material blocks with metallic conductive layers. The dielectric blocks provide the waveguide structure and mode confinement, while the conductive layers (such as silver plating) provide the necessary electromagnetic boundary conditions and resonant properties. This composite approach enables compact sizing while maintaining the performance characteristics traditionally associated with larger air cavity filters.
2Volume of moving object
If dielectric combline duplexers are used, then size is reduced, but performance is compromised
Solution Approach 1:
The patent transitions from the planar combline structure to a three-dimensional waveguide configuration. By utilizing the vertical dimension and creating stacked waveguide blocks with multiple resonant cavities, the design achieves compact footprint while providing the necessary frequency separation and filtering performance. The waveguide modes propagate in multiple dimensions, enabling superior performance compared to two-dimensional combline structures.
Solution Approach 2:
The duplexer is divided into separate functional blocks including transmit waveguide sections, receive waveguide sections, and antenna coupling blocks. Each segment is optimized for specific functions (transmission, reception, filtering) and then integrated together. This segmentation allows independent optimization of each module for compact size while maintaining overall system performance through careful design of the interfaces between segments.
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 module provides efficient transmission and filtering of RF signals, achieving performance comparable to air cavity filters while maintaining a compact size similar to dielectric combline duplexers.
Implementation Method 1
respective RF signal transmission windows in the layer of conductive material defining direct coupling RF signal transmission paths between the antenna and the Tx and Rx blocks
Implementation Method 2
a layer of conductive material covering each of the respective antenna and lower and upper Tx and Rx blocks
Data Source
AI summary
An RF dielectric waveguide duplexer filter module with antenna and lower and upper Tx and Rx signal transmission blocks of dielectric material attached together in a side-by-side and stacked relationship. The blocks are covered with conductive material. Antenna and Tx and Rx input/outputs are defined at opposite ends of the filter module. RF signal transmission windows define direct coupling RF signal transmission paths between the antenna and the Tx and Rx blocks and between the lower and upper Tx and Rx blocks. One or more bridges of dielectric material on the lower Tx and Rx blocks define inductive cross-coupling Tx and Rx signal transmission paths. The Tx signal is transmitted only in the direction of the antenna block or between the upper and lower Tx blocks. The Rx signal is transmitted only in the direction of the Rx RF signal input/output or between the upper and lower Rx blocks.