Balanced Duplexer Isolation Circuit for Wideband Signal Leakage
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Solution Overview
Problem
Conventional duplexer technologies face limitations in isolating high bandwidth wireless signals, leading to insertion loss and insufficient bandwidth for high-frequency operations, which affects communication efficiency.
Innovation Solution
The implementation of isolation circuitry with multiple baluns and variable impedance devices that isolate transmitter and receiver signals, allowing for enhanced signal pass-through and leakage reduction, thereby increasing bandwidth and maintaining isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional EBD is used to isolate transmitter and receiver signals, then isolation between transmission and received signals is achieved, but insertion loss increases and bandwidth is insufficient for high bandwidth operations
Solution Approach 1:
The patent divides the isolation function into multiple separate balun circuits instead of using a single EBD component. Each balun handles specific frequency ranges, allowing the system to maintain isolation while reducing insertion loss across the entire bandwidth by optimizing each segment independently for its operating range.
Solution Approach 2:
The patent employs variable impedance devices that can dynamically adjust their impedance characteristics based on the operating frequency and signal conditions. This dynamic adjustment allows the baluns to optimize isolation and minimize insertion loss across varying bandwidth requirements, including high bandwidth operations exceeding 10 MHz.
2Reliability
If a conventional EBD is used to isolate transmitter and receiver signals, then isolation between transmission and received signals is achieved, but bandwidth is limited and insufficient for high bandwidth operations
Solution Approach 1:
The isolation function is segmented across multiple balun circuits, each optimized for different frequency ranges. This segmentation enables the system to support high bandwidth operations by distributing the isolation task across multiple specialized components rather than relying on a single broadband component with limited performance.
Solution Approach 2:
Variable impedance devices provide dynamic adaptability, allowing the baluns to adjust their electrical characteristics in real-time to accommodate varying bandwidth requirements. This dynamic behavior enables the system to maintain effective isolation across high bandwidth operations that would exceed the capabilities of conventional fixed-impedance EBDs.
3Adaptability or versatility
If isolation circuitry with multiple baluns is used, then bandwidth is enhanced and insertion loss is reduced, but device complexity increases
Solution Approach 1:
While segmentation into multiple baluns does increase component count, each balun is designed as a modular unit with standardized interfaces. This modular segmentation allows for easier integration and maintenance, partially offsetting the complexity increase by enabling independent optimization and replacement of individual balun modules.
Solution Approach 2:
The variable impedance devices serve multiple functions simultaneously: they provide impedance matching, enhance isolation, and enable dynamic bandwidth adjustment. By consolidating multiple functions into single components, the patent reduces the overall system complexity despite using multiple baluns, as each balun with variable impedance devices can handle several operational requirements.
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 effectively reduces insertion loss and enhances bandwidth, improving communication efficiency by preventing signal interference and supporting high-frequency operations beyond conventional limits.
Implementation Method 1
a first balun transformer and a first set of variable impedance devices coupled to the first balun transformer
Implementation Method 2
a first set of variable impedance devices coupled to the first balun transformer
Data Source
AI summary
Embodiments disclosed herein relate to isolating a receiver circuit of an electronic device from a transmission signal and leakage of the transmission signal. To do so, an isolation circuit is disposed between the receiver circuit and a transmission circuit. The isolation circuit may include multiple variable impedance devices and one or more antennas. The impedances of the variable impedance devices may be balanced such that a signal at a particular frequency or within a particular frequency band can pass through or is blocked by the isolation circuit. The isolation circuit may include one or more double balanced duplexers to achieve the improved isolation. The isolation circuit may also increase bandwidth available for wireless communications of the electronic device.