Dielectric RF Bidirectional Coupler for Ultra-Wideband Signal Routing
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Solution Overview
Problem
Current directional couplers are limited to the microwave frequency range and fail to operate effectively across the ultra-wideband frequency range, including millimeter and terahertz ranges, necessitating a solution that can handle frequencies from 3 GHz to 3000 GHz.
Innovation Solution
A bidirectional coupler with power divider/combiner functionality based on dielectric waveguide structures, featuring tapered ends and tapered slot antennas, which provide a high-pass and low-pass filter characteristic, respectively, allowing for efficient energy coupling and separation across a broad frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If transmission line designs are used for directional couplers, then the device can operate in the microwave frequency range, but it fails to operate effectively across the ultra-wideband frequency range including millimeter and terahertz ranges
Solution Approach 1:
The patent changes the fundamental operating parameters by transitioning from transmission line designs to dielectric waveguide structures. This parameter change enables the device to operate across an ultra-wide frequency range from 3 GHz to 3000 GHz, resolving the contradiction between frequency range coverage and operational effectiveness by adapting the waveguide geometry and dielectric properties to different frequency bands
Solution Approach 2:
The dielectric waveguide structure is designed to perform multiple functions across different frequency ranges (microwave, millimeter-wave, and terahertz). The same basic structure with adjusted geometric parameters can handle various frequency bands, providing universal operation while maintaining reliability through the fundamental waveguide mechanism
2Adaptability or versatility
If dielectric waveguide structures with tapered ends are used, then the device achieves efficient energy coupling across a broad frequency range, but the manufacturing complexity increases
Solution Approach 1:
The dielectric waveguide is divided into multiple sections with different geometric parameters, including tapered sections and uniform sections. Each segment is optimized for specific frequency ranges, allowing the overall structure to cover a broad spectrum while maintaining manufacturability by breaking down the complex geometry into manageable segments that can be fabricated using standard techniques
3Adaptability or versatility
If the coupler uses multiple access ports for power divider/combiner functionality, then the device provides versatile signal routing, but the device complexity increases
Solution Approach 1:
The directional coupler is designed with four access ports that can function in multiple modes: as a power divider, power combiner, or bidirectional coupler. The same physical structure supports different operational configurations by changing which ports are used as inputs and outputs, providing versatile signal routing without requiring multiple separate devices, thus managing complexity through multi-functionality
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 efficient energy splitting and combining across an extremely wide frequency range, reducing insertion losses and maintaining low crosstalk, with simulated results showing flat transmission and high isolation across 20 GHz to 300 GHz, suitable for applications in radio-frequency engineering.
Implementation Method 1
The incoming signal power at the input port (P1) is commonly split between the output ports using transmission lines close to each other, allowing the energy passing through one waveguide to couple into the other by evanescent wave leakage.
Implementation Method 2
The first and second group of access ports further comprise tapered slot antennas, TSA, providing a band-pass filter transfer function, operating over a low frequency range up to a high cut-off frequency fCH in the millimeter/sub-millimeter wave range.
Implementation Method 3
The bidirectional coupler comprises a free propagation region substrate. The access ports comprise dielectric waveguide structures, all comprising tapered ends
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
An ultra-wideband radio-frequency bidirectional coupler with power divider/combiner functionality (200A, 200B, 300, 400A, 400B, 400C) for signals with frequency reaching up to 300 GHz, a free propagation region substrate (210) with a pair of opposed edges (240A, 240B), a first group of access ports (P-L1 - P-LM) established along the at least one edge of said free propagation region substrate (210); and a second group of access ports (P-R1 - P-RM) established along the opposite edge of said free propagation region substrate (210), wherein the first and second groups of access ports (P-L1 - P-LM), (P-R1 - P-RN) comprise dielectric waveguide structures (DW-L1 - DW-LM), (DW-R1 - DW-RN) providing a high-pass characteristic interconnect operating over a high frequency range starting from a low cut-off frequency fCL in the microwave range or in the millimeter-wave range.