Tunable RF Diplexer Phase Inversion for Broadband Isolation
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Solution Overview
Problem
Existing RF diplexers face challenges in providing high isolation across broad RF frequency spectra, particularly at high communication bands, and struggle to maintain this isolation across large portions of the frequency spectrum.
Innovation Solution
A tunable RF diplexer design incorporating a first and second hybrid coupler, an RF filter circuit, and a phase inversion component, which provides a differential phase shift to enhance isolation between different frequency bands, utilizing components like weakly coupled resonators or transformers to achieve broadband isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional RF diplexer topologies are used, then basic diplexing function is achieved, but broadband isolation between different RF communication bands is insufficient
Solution Approach 1:
The diplexer is segmented into multiple functional modules: first and second hybrid couplers for signal separation, RF filter circuits for frequency-selective filtering, and phase inversion components for isolation enhancement. Each module performs a specific function, and their cascaded arrangement enables broadband isolation across multiple frequency bands through cumulative effect.
Solution Approach 2:
Phase inversion components are introduced as intermediary elements between the hybrid couplers and RF filter circuits. These intermediaries provide differential phase shifts that actively cancel leakage signals and enhance isolation between diplexed bands, acting as mediators that improve overall system performance without disrupting the basic diplexing function.
2Reliability
If isolation between RF bands is increased using conventional methods, then band separation is improved, but isolation performance degrades across large portions of the RF frequency spectrum
Solution Approach 1:
The diplexer employs tunable RF filter circuits with variable reactive impedance levels that can be dynamically adjusted based on operating conditions. This dynamic adaptability allows the filter characteristics to be optimized for different frequency bands, maintaining high isolation performance across the entire RF spectrum rather than being fixed for a single band.
Solution Approach 2:
The phase inversion component and hybrid coupler configuration provide multi-functional benefits: they simultaneously enable broadband isolation, maintain diplexing performance across multiple bands, and support both receive and transmit operations. This universal design achieves multiple objectives with a single architectural approach.
3Reliability
If high isolation is achieved at specific high RF communication bands, then performance at those bands is improved, but isolation performance deteriorates across the broader frequency spectrum
Solution Approach 1:
The diplexer architecture nests multiple isolation mechanisms within each other: hybrid couplers provide initial signal separation, RF filter circuits provide frequency-selective filtering, and phase inversion components provide additional isolation. These nested layers of isolation work cumulatively to achieve broadband performance across the entire frequency spectrum.
Solution Approach 2:
The diplexer uses composite architectural structures combining different types of RF components with complementary characteristics. The hybrid couplers, RF filters, and phase inversion elements form a composite system where each component contributes specific isolation properties, achieving superior broadband isolation that no single component could provide alone.
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 effectively increases broadband isolation and maintains high isolation across greater portions of the RF frequency spectrum, improving the performance of RF diplexers in modern RF front-ends by effectively routing and filtering RF signals across various communication bands.
Implementation Method 1
The phase inversion component is configured to provide approximately a differential phase shift
Implementation Method 2
The RF diplexer includes a first hybrid coupler, a second hybrid coupler
Implementation Method 3
an RF filter circuit, and a phase inversion component. Both the RF filter circuit and the phase inversion component are connected between the first hybrid coupler and the second hybrid coupler
Data Source
AI summary
Embodiments of a tunable radio frequency (RF) diplexer and methods of duplexing transmission and receive signals are disclosed. In one embodiment, the RF diplexer includes a first hybrid coupler, a second hybrid coupler, and an RF filter circuit, and a phase inversion component. Both the RF filter circuit and the phase inversion component are connected between the first hybrid coupler and the second hybrid coupler. In some embodiments, the phase inversion component is provided by the RF filter circuit, while in other embodiments, the phase inversion component is provided separately. The phase inversion component is configured to provide a differential phase shift. The benefit of introducing the differential phase shift is that it provides increased isolation and broadband isolation between the different frequency bands being diplexed by the RF diplexer.