Switchable RF Filter Circuit for V2X Isolation and Low-Loss Transmission
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Solution Overview
Problem
Multi-band and multi-mode radio-frequency circuits face challenges in transmitting radio-frequency signals with low loss and high isolation due to the difficulty in optimizing impedance design for different transmission applications like EN-DC and V2X communication, which require different bandpass characteristics.
Innovation Solution
A radio-frequency circuit design with multiple filters and switches that selectively connect to a power amplifier based on the transmission application, allowing filters to be optimized for specific bandpass characteristics, and power amplifiers to operate in different modes to reduce power consumption and signal distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single filter is used for multiple transmission applications, then device complexity is reduced, but transmission quality deteriorates due to inability to optimize impedance design for different applications
Solution Approach 1:
The patent divides the filter system into multiple separate filters (first filter for EN-DC, second filter for V2X communication) instead of using a single filter for all applications. This segmentation allows each filter to be independently optimized for its specific transmission application, resolving the contradiction between device complexity and transmission quality.
Solution Approach 2:
The patent introduces a switch that dynamically selects which filter to connect to the power amplifier based on the current transmission application. This dynamic configuration allows the system to adapt between different transmission modes (EN-DC and V2X) by switching between appropriately optimized filters, maintaining high transmission quality while managing complexity through intelligent control.
2Reliability
If filters are optimized for specific bandpass characteristics, then transmission quality improves, but device complexity increases due to multiple filters and switches
Solution Approach 1:
The patent designs the filter system where each filter is specialized for specific applications (first filter for EN-DC, second filter for V2X), but the overall system achieves multi-functionality through the switch that can connect different filters to the power amplifier. This allows the system to handle multiple transmission applications with optimized characteristics while managing complexity through a modular, switch-based architecture.
3Productivity
If power amplifier operates in all modes simultaneously, then power consumption increases, but transmission capability is maintained
Solution Approach 1:
The patent implements periodic or intermittent operation of the power amplifier by switching it on or off based on the detected transmission application. Instead of operating continuously in all modes, the power amplifier is activated only when needed for specific transmission modes, reducing overall power consumption while maintaining transmission capability when required.
Data Source
AI summary
A radio-frequency circuit includes a first filter having a first passband including a first band; a second filter having a second passband including the first band; a power amplifier that amplifies a radio-frequency signal in the first band; and a switch that switches between connection between the first filter and the power amplifier and a connection between the second filter and the power amplifier. Under a condition that a transmission of the radio-frequency signal in the first band is not V2X communication, the first filter is connected to the power amplifier via the switch. Under a condition that the transmission of the radio-frequency signal in the first band is the V2X communication, the second filter is connected to the power amplifier via the switch.