Pre-Tuned Electrical Balance Duplexer for Wideband Radar Isolation
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Solution Overview
Problem
Conventional electrical balance duplexers in radar transceivers require complex impedance tuning and additional hardware to achieve high spillover rejection, which is limited to a narrow bandwidth and involves significant silicon area, making them cumbersome and inefficient for full-duplex operations.
Innovation Solution
A radar transceiver with a pre-tuned electrical balance duplexer using a hybrid transformer network and non-tunable balancing impedance, coupled with a high-pass filter and tunable delay circuit, allows for wideband operation and efficient spillover suppression across frequencies, enabling full-duplex, reception-only, and transmission-only modes through switch-controlled impedance bypass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex impedance tuning and additional hardware are used to achieve high spillover rejection, then spillover rejection is improved, but device complexity and silicon area increase
Solution Approach 1:
The patent extracts and eliminates the complex adaptive impedance tuning network from the EBD design. Instead of using programmable impedance elements and heavy algorithmic control, the invention uses a fixed, pre-determined impedance network that is inherently matched to the antenna impedance, thereby removing the need for complex tuning hardware and software while maintaining high spillover rejection.
Solution Approach 2:
The patent changes the impedance parameter from a dynamically adjustable value to a fixed value that is predetermined based on antenna characteristics. This parameter change eliminates the need for complex tuning mechanisms while achieving optimal spillover rejection through proper initial design matching.
2Reliability
If complex impedance tuning is used to achieve high spillover rejection, then spillover rejection is improved, but the bandwidth is reduced
Solution Approach 1:
The patent applies preliminary design action by pre-determining the impedance network values based on anticipated antenna impedance characteristics before the radar system operates. This preliminary matching enables the EBD to achieve high spillover rejection across a wide bandwidth without requiring real-time adaptive tuning, thus resolving the bandwidth limitation of conventional narrowband tuned EBDs.
3Reliability
If switched-component devices with multiple stacked transistor-based switch devices are used, then switch breakdown is avoided, but device complexity and silicon area increase
Solution Approach 1:
The patent extracts and removes the complex switched-component devices with multiple stacked transistors from the EBD design. Instead of using these complex switching mechanisms, the invention employs a fixed impedance network that eliminates the need for such complicated switch arrangements, thereby reducing device complexity and silicon area while maintaining reliability.
4Reliability
If EBD is tuned for high spillover rejection at a single frequency, then spillover rejection is improved, but bandwidth is reduced
Solution Approach 1:
The patent changes the impedance parameters of the balancing network based on predetermined antenna impedance characteristics across different frequencies. By designing the impedance network to account for frequency variations in advance, the EBD achieves high spillover rejection across a wide bandwidth rather than being limited to a single frequency point.
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 achieves high spillover rejection and reduced physical dimensions, facilitating ultra-wideband operation with minimal insertion loss and improved flexibility in system design, supporting MIMO radar systems.
Implementation Method 1
The electrical balance duplexer comprises a hybrid transformer network
Implementation Method 2
the non-tunable balancing impedance is configured to provide a fixed impedance value that is defined corresponding to an impedance at the antenna node
Data Source
AI summary
A radar transceiver is provided. The radar transceiver includes an electrical balance duplexer that is coupled to a transmission node of a transmission path, a reception node of a reception path, and an antenna node and that is configured to isolate the transmission path from the reception path. The electrical balance duplexer includes a hybrid transformer network and a non-tunable balancing impedance. The non-tunable balancing impedance is configured to provide a fixed impedance value that corresponds to an impedance value at the antenna node.