High-Frequency Filter Switching for Simultaneous Rx/Tx Isolation
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Solution Overview
Problem
Conventional high-frequency circuits experience degradation in reception signal quality during Simultaneous Rx/Tx operations.
Innovation Solution
A high-frequency circuit design incorporating specific filters and switch circuits to enhance signal isolation between transmission and reception paths, utilizing band pass filters and switchable connections to improve reception signal quality in Simultaneous Rx/Tx scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional high-frequency circuit design is used, then device complexity is reduced, but reception signal quality degrades in Simultaneous Rx/Tx operations
Solution Approach 1:
The high-frequency circuit is segmented into multiple independent filter units (first filter, second filter, third filter, fourth filter) and switchable connection paths. Each filter handles specific frequency bands (first band, second band) for TDD operations, allowing simultaneous Rx/Tx by directing signals through appropriate segments based on operational mode requirements.
Solution Approach 2:
Switch circuits act as intermediary components that mediate between the antenna, power amplifiers, low-noise amplifiers, and filters. These switches dynamically connect or disconnect specific signal paths, enabling the circuit to transition between different operational modes (simultaneous Rx/Tx, TDD, FDD) and protect reception signals from transmission interference.
2Productivity
If Simultaneous Rx/Tx operation is enabled, then communication efficiency is improved, but interference between transmission and reception signals increases
Solution Approach 1:
Different filter units are designed with specific frequency band characteristics optimized for their designated functions. The first and second filters handle transmission bands while the third and fourth filters handle reception bands, creating localized frequency domain separation that reduces interference while enabling simultaneous operations.
Solution Approach 2:
The switch circuits dynamically reconfigure the signal paths based on real-time operational requirements. During simultaneous Rx/Tx, the switches connect transmission signals through power amplifiers to the antenna while separately connecting reception signals through low-noise amplifiers and filters to the antenna, creating dynamic isolation that prevents interference.
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 proposed circuit design effectively suppresses interference between transmission and reception signals, enhancing the quality of reception signals in Simultaneous Rx/Tx operations.
Implementation Method 1
a first filter having a pass band including a first band for time division duplex, a second filter having a pass band including a second band for time division duplex
Data Source
AI summary
A high-frequency circuit includes: a first filter having a first pass band including a band A); a second filter having a second pass band including a band B for of simultaneous transmission and reception with the band A; a third filter having a pass band including the band A; a fourth filter having a pass band including the band B; and fifth and sixth filters having a pass band including the band A and the band B, respectively, and connected to a first input/output terminal. A first switch circuit includes a terminal connected to a power amplifier and first and second terminals connected to the first and second filters), respectively. A second switch circuit included first to sixth terminals connected to the first to sixth filters, respectively. A terminal is connected to a second input/output terminal not via the fifth and sixth filters.