Inverted RF Coupler for Wideband Phase Stability
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Solution Overview
Problem
Conventional RF signal combiners suffer from poor phase matching and amplitude matching, limiting their bandwidth and requiring custom tuning, which leads to accumulative amplitude and phase variations when used in beam forming networks, restricting their operational range to less than one octave.
Innovation Solution
The implementation of an inverted overlay coupler design in RF signal combiners, which reduces frequency-dependent variations by using multiple conductive layers and dielectric layers to achieve controlled coupling and phase matching across a wider bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional couplers are used in RF signal combiners, then the device can be manufactured with standard processes, but the phase matching and amplitude matching are poor, limiting the bandwidth to less than one octave
Solution Approach 1:
The patent transitions from planar 2D trace layouts to a 3D multi-layer stacked configuration. By vertically stacking conductive layers separated by dielectric substrates, the coupler achieves controlled coupling through vertical proximity while maintaining planar manufacturing compatibility. This dimensional transition enables broadband operation by providing consistent phase and amplitude matching across frequency variations.
Solution Approach 2:
The invention employs composite structures combining multiple conductive layers with dielectric materials. The stacked configuration integrates conductive traces on different layers with dielectric substrates and spacing elements, creating a composite architecture that provides controlled impedance and consistent coupling characteristics across a wide bandwidth while remaining compatible with standard PCB manufacturing processes.
2Device complexity
If conventional couplers are used, then the structure is simple, but custom tuning is required which increases device complexity and reduces productivity
Solution Approach 1:
The stacked coupler design is self-adjusting through its vertical layer configuration. The fixed vertical spacing between conductive layers on different substrates automatically provides consistent coupling characteristics without requiring post-manufacturing tuning. The structure inherently maintains phase and amplitude matching across the operating bandwidth, eliminating the need for custom adjustment procedures.
3Adaptability or versatility
If multiple conventional couplers are cascaded in series, then the desired RF function is achieved, but the amplitude and phase variations accumulate, producing very large variations not tolerable by the network
Solution Approach 1:
By stacking coupler stages vertically rather than cascading them horizontally in a single plane, the patent reduces the accumulative effect of phase and amplitude variations. The vertical separation between stages through dielectric layers provides isolation that prevents error propagation, while the consistent 3D geometry of each stage ensures uniform coupling characteristics across all cascaded stages.
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
This design enables the creation of RF structures and modules with wider instantaneous bandwidth, eliminating the need for costly active MMICs and allowing for the construction of broadband Butler matrices without significant tuning or reconfiguration.
Implementation Method 1
The conductive trace of the second section is located in proximity to the conductive trace of the fifth section to allow signal coupling between the conductive trace of the second section and the conductive trace of the fifth section
Data Source
AI summary
A radio frequency (RF) communication device may include an RF 90-degree hybrid combiner having stable phase and loss characteristics over greater than one octave of bandwidth, while providing a high degree of isolation between input and isolated port. The structure may include a first element and a second element. The first element includes a first port, a first section for phasing matching, a second section for conductive-layer inversion, a third section for phase-matching section, and a third port. The second element includes a fourth port, a fourth section for phasing matching, a fifth section for conductive-layer inversion, a sixth section for phase-matching, and a second port. In one example, the second and fifth sections are utilized for signal coupling. In another example, the first, third, fourth, and sixth sections are utilized for signal coupling. Different ports may have matched phase differences.