BAW RF Duplexer Bridge-Ladder Output for Balanced Signal Conversion
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Solution Overview
Problem
Existing RF duplexers for mobile devices face challenges in converting single-input signals to balanced signals efficiently, leading to hardware complexity and increased costs due to the use of baluns or single-type output ends.
Innovation Solution
A Radio Frequency (RF) duplexer using Bulk Acoustic Wave Resonators (BAWRs) with a port converter that converts single-input signals into balanced signals via dual-output ports, utilizing a BAWR receiving filter unit with ladders and bridges, and a BAWR transmitting filter unit to minimize noise and simplify hardware implementation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-type output end is used in the RF duplexer, then the hardware implementation is simplified, but the noise characteristics of received signals deteriorate
Solution Approach 1:
The single output end is segmented into two separate output ends (first output end and second output end), each handling different signal paths. This segmentation allows the system to maintain simple hardware implementation while improving noise characteristics by providing dedicated output paths for different signal types.
Solution Approach 2:
The patent transitions from a single-dimensional output structure to a two-dimensional output structure by adding another output end. This dimensional change enables the system to handle multiple signal paths simultaneously, improving noise characteristics without significantly increasing hardware complexity.
2Object-affected harmful factors
If a balun is added to convert single signal to balance signals, then the noise characteristics are improved, but the cost increases
Solution Approach 1:
The patent combines the signal conversion function with the existing output structure by integrating a combining network that merges signals from multiple BAWR paths. This merging approach eliminates the need for separate balun components, improving noise characteristics while avoiding additional manufacturing costs.
Solution Approach 2:
The combining network performs multiple functions: it converts single signals to balance signals, combines outputs from multiple BAWRs, and maintains impedance matching. This multi-functionality replaces what would traditionally require separate balun and combining components, reducing cost while improving performance.
3Reliability
If additional devices like phase shifters or baluns are used, then the signal conversion performance is improved, but the device complexity increases
Solution Approach 1:
The BAWR-based filter unit performs signal conversion and balancing functions inherently through its dual-output structure and combining network. The system serves its own signal conversion needs without requiring external phase shifters or baluns, maintaining simple device architecture while achieving reliable signal conversion performance.
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 effectively converts single-input signals to balanced signals, reducing noise and simplifying hardware implementation, thereby improving the performance of RF duplexers without the need for additional devices like phase shifters or baluns.
Implementation Method 1
Radio frequency filter and radio frequency duplexer including bulk acoustic wave resonators in a ladder and a bridge
Implementation Method 2
a BAWR receiving filter unit comprising an input end to receive the balance signal from the dual-output port, and an output end used for dual output, and a BAWR transmitting filter unit
Data Source
AI summary
A Radio Frequency (RF) duplexer including Bulk Acoustic Wave Resonators (BAWRs) and an RF filter including BAWRs are provided. The RF duplexer may convert the received signal into a balance signal and output the balance signal via a dual-output port. The RF duplexer may also include a BAWR receiving filter unit including an input end to receive the balance signal from the dual-output port, and an output end used for dual output. The RF duplexer may also include a BAWR transmitting filter unit to transmit a transmitted signal to the antenna via a single-output port.