Parallel-Plate Diplexer With Tuning Networks For Dispersion Control
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Solution Overview
Problem
Conventional methods for separating widely separated frequency bands in dual-band antenna systems require substantial packaging volume, result in reduced efficiency, bandwidth, and increased design complexity, and often necessitate additional diplexing hardware.
Innovation Solution
A parallel-plate diplexer design that uses two intersecting parallel-plates with tuning networks to split RF signals into distinct frequency bands, eliminating the need for separate diplexing hardware and transitioning directly to waveguide or coaxial media, thereby reducing dispersion and manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional separately attached diplexing devices are used to separate frequency bands, then frequency separation is achieved, but packaging volume and device complexity increase substantially
Solution Approach 1:
The patent merges the diplexing function directly into the parallel-plate transmission line structure by integrating tuning networks (resonators and stubs) within the transmission line itself. This eliminates the need for separate diplexing devices and reduces overall device complexity while maintaining frequency separation capability.
Solution Approach 2:
The parallel-plate transmission line structure serves multiple functions simultaneously: it acts as both the transmission medium and the diplexing device. The tuning networks integrated into the transmission line perform both signal transmission and frequency separation, reducing the need for additional components.
2Reliability
If conventional separately attached diplexing devices are used to separate frequency bands, then frequency separation is achieved, but packaging volume increases substantially
Solution Approach 1:
The diplexing function is merged into the transmission line structure, eliminating the need for separate diplexing devices and substantially reducing packaging volume. The tuning networks are embedded within the parallel-plate transmission line, creating a compact integrated structure.
Solution Approach 2:
The tuning networks (resonators and stubs) are nested within the parallel-plate transmission line structure. This nesting approach allows the diplexing components to occupy the same spatial envelope as the transmission line, minimizing additional packaging volume.
3Adaptability or versatility
If ridged waveguide or tapered horn transitions are used to feed parallel-plate structures, then bandwidth is extended, but feeding such large structures becomes impractical in confined spaces
Solution Approach 1:
The parallel-plate structure is divided into multiple sections, each fed by simpler waveguide transitions. This segmentation allows each transition to feed a manageable portion of the overall structure, making implementation practical in confined spaces while maintaining extended bandwidth through the combined effect of multiple sections.
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 achieves improved bandwidth, efficiency, and reduced packaging size by enabling compact, high-Q dispersion-compensated separation of frequency bands, supporting wider bandwidth separations and simplifying fabrication and design.
Implementation Method 1
Tuning networks are formed in the second parallel-plate on each sides of the junction to enable/inhibit signals having a predetermined frequency range
Data Source
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AI summary
A parallel-plate diplexer includes a first parallel-plate transmission line and a second parallel-plate transmission line, a first end of the second parallel-plate transmission line including a first port and a second end of the second parallel-plate transmission line including a second port, and a first end of the first parallel-plate transmission line including a third port and a second end of the first parallel-plate transmission line being coupled to the second parallel-plate transmission line at a T-junction between the first port and the second port. The second parallel-plate transmission line includes a first parallel-plate transmission line tuning network located between the T-junction and the first port, and a second parallel-plate transmission line tuning network located between the T-junction and the second port.