Balanced Duplexer Isolation Circuit for Wideband Signal Separation
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Solution Overview
Problem
Conventional balanced duplexers face challenges in providing sufficient bandwidth and ideal isolation for high bandwidth wireless communications, leading to insertion loss and interference between transmitter and receiver signals.
Innovation Solution
The implementation of isolation circuitry with multiple baluns and variable impedance devices that can be tuned to balance or unbalance states, effectively isolating transmitter and receiver signals while preventing leakage, thereby enhancing bandwidth and reducing insertion loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional balanced duplexer components are used to isolate transmitter and receiver signals, then isolation between transmit and receive paths is provided, but insertion loss increases and bandwidth is insufficient for high bandwidth operations
Solution Approach 1:
The duplexer is divided into multiple independent balun circuits (first balun, second balun, third balun, fourth balun) that operate in parallel. Each balun handles specific frequency ranges and isolation functions, allowing the system to achieve high isolation without the signal passing through all components, thereby reducing insertion loss while maintaining reliability.
Solution Approach 2:
The patent extends the isolation mechanism from a single frequency range to multiple frequency ranges by implementing baluns tuned to different frequencies. This multi-dimensional approach allows simultaneous isolation across broad bandwidths while maintaining low insertion loss for each specific frequency band.
2Reliability
If conventional balanced duplexer components are used, then isolation between transmit and receive paths is achieved, but bandwidth is limited and insufficient for high bandwidth wireless communications
Solution Approach 1:
The isolation function is segmented across multiple balun circuits, each optimized for specific frequency ranges. This allows the system to provide robust isolation for each band while collectively supporting a much broader total bandwidth than a single conventional balun could achieve.
Solution Approach 2:
The parallel balun configuration creates a universal duplexer that can handle multiple frequency ranges and communication standards simultaneously. Each balun contributes to the overall isolation function while the combination enables high bandwidth operations across diverse wireless communication protocols.
3Adaptability or versatility
If isolation circuitry with multiple baluns is implemented, then bandwidth is increased beyond 10 MHz and insertion loss is reduced, but device complexity increases
Solution Approach 1:
Multiple balun circuits are merged into a single integrated duplexer structure that shares common components such as the antenna interface and control circuitry. This consolidation achieves high bandwidth and low insertion loss while minimizing the increase in overall device complexity compared to implementing separate isolation circuits.
Solution Approach 2:
The multi-balun duplexer serves multiple functions simultaneously: it provides isolation for multiple frequency ranges, supports various wireless communication standards, and maintains low insertion loss across broad bandwidths. This multi-functionality justifies the increased complexity by delivering superior performance across multiple dimensions.
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 increases the bandwidth of wireless communication systems beyond 10 MHz, improves signal isolation, and reduces interference between transmitter and receiver signals, supporting higher data transfer speeds and maintaining effective communication capabilities.
Implementation Method 1
a first balun transformer and 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.