Tunable Duplexer Circuit for Multi-Band Coverage in Compact Radios
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Solution Overview
Problem
Existing communication devices face challenges in achieving compactness and high performance due to the need for multiple duplexers to cover wide transmission and reception frequency bands, especially when the separation between these bands is small, leading to increased component count and device size.
Innovation Solution
A communication device with a tunable duplexer that adjusts its transmittable/receivable frequency band based on network frequency identification, using a processor to control a band pass filter and tunable tuner circuit, minimizing the number of components and reducing device size by dynamically changing impedance and frequency pass band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple duplexers are used to cover wide transmission and reception frequency bands, then frequency band coverage is improved, but device size and component count increase
Solution Approach 1:
The patent implements a universal duplexer design that can operate across multiple frequency bands (e.g., F1, F2, F3, F4) by incorporating tunable filters and impedance matching circuits. This single multi-functional duplexer replaces what would traditionally require multiple separate duplexers, thereby covering wide frequency bands while maintaining compact device size.
Solution Approach 2:
The patent employs dynamic frequency tuning mechanisms including variable capacitors, switched inductors, and tunable filters that can adjust their characteristics in real-time. This dynamic adaptability allows the duplexer to optimize performance for different frequency bands and modes (full-duplex, half-duplex, frequency division duplex) without requiring physical reconfiguration or multiple static components.
2Adaptability or versatility
If multiple duplexers are used to cover wide transmission and reception frequency bands, then frequency band coverage is improved, but component count increases
Solution Approach 1:
The patent merges multiple duplexer functions into a single integrated circuit or module. By combining transmission and reception paths, integrating multiple filters (band-pass, low-pass, high-pass) into unified structures, and consolidating impedance matching networks, the design achieves multi-band coverage with significantly reduced component count compared to using separate duplexers for each frequency band.
Solution Approach 2:
The integrated duplexer is designed to perform multiple functions simultaneously - supporting different frequency bands, operating modes (full-duplex, half-duplex, FDD, TDD), and frequency combinations. This universal design eliminates the need for multiple specialized components, reducing overall system complexity while maintaining comprehensive frequency band coverage.
3Loss of energy
If a fixed frequency band duplexer is used, then insertion loss is reduced, but adaptability to different frequency bands deteriorates
Solution Approach 1:
The patent implements dynamic impedance matching circuits with variable capacitors and switched inductors that can adjust their values to match the optimal impedance for different frequency bands. This dynamic adaptation maintains low insertion loss across multiple frequency bands, whereas a fixed-frequency design would exhibit degraded performance when operating outside its designed band.
Solution Approach 2:
The tunable filters within the duplexer can change their center frequency, bandwidth, and quality factor parameters to optimize performance for different operating conditions. By dynamically adjusting these parameters, the system maintains low insertion loss across various frequency bands and modes, resolving the contradiction between fixed-optimization and multi-band adaptability.
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 solution enables efficient frequency band management, improving separation performance and reducing insertion loss, allowing for a more compact and efficient communication device design.
Implementation Method 1
a tunable tuner circuit configured to change an impedance thereof according to the control signal
Implementation Method 2
a duplexer that can change a transmittable/receivable frequency band according to frequencies
Data Source
AI summary
A communication device includes: a communication module configured to discover a network capable of communication; a processor configured to identify a first frequency band of the network and to output a control signal for changing a pass band of a band pass filter; a multiplexer configured to change the pass band of the band pass filter to correspond to the first frequency band of the network; and a tunable tuner circuit configured to change an impedance thereof according to the control signal.