RF Dielectric Waveguide Duplexer Filter Module Compact Size
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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 dupplers are too large, necessitating a compact solution that matches the performance of air cavity filters.
Innovation Solution
An RF dielectric waveguide duplexer filter module is designed with dielectric blocks of ceramic material, featuring direct and cross-coupling RF signal transmission paths, and a conductive layer covering the exterior surfaces, allowing for efficient transmission and reception of RF signals while maintaining a compact size.
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 wavelength is reduced, allowing the same filtering performance to be achieved in a much smaller physical volume. The waveguide structure supports specific modes (TE10, TM01) that provide the necessary frequency selectivity in a compact form factor.
Solution Approach 2:
The invention employs composite construction combining dielectric material blocks with conductive material layers. The dielectric blocks provide the waveguide structure and resonance characteristics, while the conductive layers form the resonant elements and coupling structures. This composite approach enables compact size 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 dielectric blocks with conductive resonant elements, the invention achieves compact size in all three dimensions while providing the performance characteristics of traditional air cavity filters through waveguide mode control.
Solution Approach 2:
The duplexer is divided into separate functional blocks: transmit filter section, receive filter section, and antenna interface. Each section is implemented as a discrete dielectric waveguide structure with its own resonant elements. This segmentation allows optimized performance in each function while maintaining overall compact size, overcoming the performance limitations of combline designs.
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 achieves performance comparable to air cavity filters while maintaining a size comparable to dielectric combline duplexers, effectively addressing the size and performance gap in existing technologies.
Implementation Method 1
a layer of conductive material covering each of the respective antenna and lower and upper Tx and Rx blocks
Implementation Method 2
respective RF signal transmission windows in the layer of conductive material defining direct coupling RF signal transmission paths
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.