Duplexer Resonator Layout for Intermodulation Noise Suppression
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Solution Overview
Problem
Recent duplexer designs face challenges in reducing the influence of distorted waves, which lead to lower signal-to-noise ratios in wireless communication devices due to inter-modulation distortion caused by the mixing of transmission and out-of-band disturbance waves.
Innovation Solution
A duplexer configuration with an antenna terminal, a transmission filter, a reception filter, and a disturbance wave resonator is implemented, where the disturbance wave resonator is positioned closer to the antenna terminal than the transmission and reception filters, and its resonance frequency is set within the disturbance wave band, effectively suppressing the input of disturbance waves into the filters and reducing inter-modulation distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional duplexer configuration is used, then the structure is simple, but distorted waves are generated due to inter-modulation distortion between transmission and disturbance waves
Solution Approach 1:
The duplexer is segmented into distinct functional components: transmission filter, reception filter, and disturbance wave resonator. Each component handles specific frequency ranges or signal types, allowing independent optimization and reducing inter-modulation distortion between different signal paths.
Solution Approach 2:
The disturbance wave resonator acts as an intermediary element that specifically targets and suppresses disturbance waves before they can mix with transmission signals. This resonator serves as a mediator that prevents the harmful interaction between transmission and disturbance waves, improving signal quality without requiring complete system redesign.
2Reliability
If the disturbance wave resonator is positioned closer to the antenna terminal, then the suppression of disturbance waves is improved, but the connection path length increases
Solution Approach 1:
The disturbance wave resonator is positioned to act preliminarily on disturbance waves before they reach the transmission and reception filters. By placing the resonator closer to the antenna terminal, disturbance waves are suppressed at an early stage in the signal path, preventing them from causing inter-modulation distortion downstream.
3Reliability
If the resonance frequency of the disturbance wave resonator is set within the disturbance wave band, then the suppression effect is enhanced, but the risk of affecting transmission band signals increases
Solution Approach 1:
The disturbance wave resonator is designed with specific local characteristics: its resonance frequency is precisely tuned to match the disturbance wave band, and its coupling to the antenna terminal is optimized to create a deep impedance notch at the disturbance frequency. This localized tuning ensures strong suppression of disturbance waves while minimizing impact on transmission band signals through careful frequency separation and coupling control.
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 configuration significantly reduces the generation of distorted waves, thereby enhancing the signal-to-noise ratio and improving the quality of wireless communication by minimizing the mixing of transmission and disturbance waves.
Implementation Method 1
a resonance frequency of the disturbance wave resonator is within a disturbance wave band which is a frequency range smaller than the passband of the transmission filter and which includes the frequency range of the disturbance waves
Data Source
AI summary
A branching 1 filter has an antenna terminal 3 which receives signal waves and disturbance waves, a transmission filter 11 which is connected to the antenna terminal 3, a reception filter 13 which is connected to the antenna terminal 3 and receives a portion of the signal waves and has, as a passband, a frequency range higher than a passband of the transmission filter 11, and a disturbance wave resonator which is connected to the antenna terminal 3 and to the ground and positioned closer to the antenna terminal 3 side than the transmission filter 11 and the reception filter 13. The disturbance wave resonator 15 is connected to antenna terminal 3 at a position closer to the antenna terminal 3 side than the transmission filter 11 and the reception filter 13. A resonance frequency of the disturbance wave resonator 15 is within a frequency range smaller than the passband of the transmission filter and includes a frequency range of the disturbance waves.