High-Frequency Circuit Signal Isolation and Power Loss Reduction
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Solution Overview
Problem
Conventional high-frequency circuits struggle to handle multiple communications systems efficiently, particularly in MIMO systems, due to difficulties in signal isolation and increased transmission power loss, especially when handling multiband wireless communications.
Innovation Solution
The high-frequency circuit design incorporates an integral laminate with dielectric layers and electrode patterns, featuring antenna and switch circuits with multiplexer and filter configurations that reduce the need for additional multiplexer circuits in transmitting paths, and utilizes low-noise amplifier circuits and bandpass filters to minimize transmission power loss and enhance receiving sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiplexer circuits are added to separate transmitting and receiving signals in multiband communications, then signal isolation between communications systems is improved, but transmission power loss increases and device complexity increases
Solution Approach 1:
The patent extracts the multiplexer circuit from the transmitting signal path, connecting the transmitting terminal directly to the antenna terminal without passing through the multiplexer. This removes the source of power loss while maintaining signal isolation through the switch circuit, which selectively connects transmitting terminals to antenna terminals based on frequency band.
Solution Approach 2:
The patent segments the signal processing path into receiving path (through multiplexer for isolation) and transmitting path (direct connection to avoid loss). The switch circuit acts as a selector that divides the transmitting path into separate frequency band channels, allowing direct connection without power loss while maintaining isolation.
2Reliability
If additional multiplexer circuits are added to handle multiple communications systems, then signal isolation between systems is improved, but device complexity increases
Solution Approach 1:
The switch circuit serves multiple functions: it acts as a frequency band selector for transmitting signals and as an isolator between different communications systems. By making the switch circuit multi-functional, the patent avoids adding separate isolation circuits for each system, thereby reducing overall device complexity while maintaining signal isolation.
3Reliability
If more receiving terminals are added for MIMO system, then receiving sensitivity is improved, but isolation between communications systems becomes difficult and device complexity increases
Solution Approach 1:
The patent resolves the isolation problem in MIMO systems by adding a frequency band dimension. The switch circuit selectively connects different antenna terminals to transmitting terminals based on frequency band, creating a new dimension for signal separation. This allows multiple receiving terminals to operate simultaneously in different frequency bands without interference, maintaining isolation while improving receiving sensitivity through MIMO capability.
Data Source
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AI summary
A high-frequency circuit comprising first and second antenna terminals, a transmitting terminal and first and second receiving terminals for first and second communications systems, and first and second switch circuits each having a common terminal and at least first and second switching terminals; the first antenna terminal being connected to a common terminal of the first switch circuit, the transmitting terminal for the first communications system being connected to the first switching terminal of the first switch circuit, the second antenna terminal being connected to a common terminal of the second switch circuit, the transmitting terminal for the second communications system being connected to the first switching terminal of the second switch circuit, each first receiving terminal for the first and second communications systems being connected to the second switching terminal of the first switch circuit via a first receiving-side multiplexer circuit, each second receiving terminal for the first and second communications systems being connected to the second switching terminal of the second switch circuit via a second receiving-side multiplexer circuit.