HF Circuit Carrier Aggregation Duplexer Phase Shifter
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional HF circuits face challenges in maintaining signal quality due to increased unwanted interactions between circuit elements as they shrink in size and increase in functionality, particularly when supporting multiple frequency bands for carrier aggregation.
Innovation Solution
The HF circuit design includes a duplexer with tunable filters and phase shifters, allowing for simultaneous operation across different frequency bands with reduced circuit complexity, enabling carrier aggregation in smaller form factors without compromising signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the size of electrical circuits is reduced to make devices smaller, then the device dimensions decrease, but unwanted interactions between circuit elements increase degrading signal quality
Solution Approach 1:
The HF circuit is segmented into multiple independent signal paths (first signal path with first duplexer, second signal path with second duplexer, third signal path with third filter). Each path handles specific frequency bands separately, preventing unwanted interactions between different frequency signals while maintaining compact overall device size.
Solution Approach 2:
Duplexers and filters serve as intermediary components between different signal paths and the common port. These intermediaries selectively route different frequency bands through appropriate paths, isolating signals and preventing harmful interactions while enabling simultaneous operation in multiple bands.
2Adaptability or versatility
If the number of circuit elements is increased to support more functions and frequency bands, then the functionality and adaptability increase, but the device complexity and unwanted interactions increase
Solution Approach 1:
The HF circuit employs universal components that can handle multiple frequency bands. The first and second duplexers and the third filter are designed with tunable characteristics, allowing a single component to serve multiple frequency bands (LB, MB, HB) rather than requiring separate dedicated components for each band.
Solution Approach 2:
The circuit incorporates tunable filters and phase shifters that can dynamically adjust their characteristics based on the required frequency band. This dynamic adaptability allows the same hardware configuration to support different carrier aggregation combinations without requiring additional fixed components for each scenario.
3Adaptability or versatility
If conventional HF circuits with multiple HF switches are used for carrier aggregation, then frequency band switching is possible, but signal quality deteriorates in frequency bands with small distance
Solution Approach 1:
Instead of using HF switches that directly connect different components, the invention introduces duplexers and filters as intermediary elements. These intermediaries provide isolated, controlled signal paths that maintain signal integrity even when operating in frequency bands with small spacing, preventing the signal quality deterioration associated with direct switching.
Solution Approach 2:
The signal paths are segmented into distinct, isolated channels through the use of duplexers and filters. Each frequency band has its own dedicated path with appropriate filtering, preventing interference between closely spaced frequency bands while maintaining the ability to aggregate multiple bands simultaneously.
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The invention relates to an HF circuit which, with a simple design, allows carrier aggregation. The circuit comprises a duplexer, an additional filter and two phase shifters, and can be used in an HF module of a mobile transceiver.