RF Front End Antenna Sharing via Selective Filtering
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Solution Overview
Problem
The increasing number of frequency bands and combinations in mobile communication technologies poses challenges in designing RF front ends that can efficiently operate across multiple bands, leading to higher insertion loss and reduced device performance, particularly in Carrier Aggregation scenarios.
Innovation Solution
The RF front end arrangement employs a switching mechanism that allows different frequency bands to share antennas by using filtering with distinct frequency response characteristics, enabling simultaneous use of multiple bands while minimizing insertion loss through selective connection of band-specific filtering to antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If band specific frequency selective filtering is used for each frequency band, then filtering performance for each band is improved, but insertion loss increases and device performance deteriorates
Solution Approach 1:
A single antenna is designed to handle multiple frequency bands simultaneously through carrier aggregation. The antenna structure and filtering system are configured to support both FDD and TDD operations across different bands (e.g., Band 1 and Band 3), allowing one antenna to perform functions that would traditionally require multiple dedicated antennas, thereby reducing overall insertion loss while maintaining band-specific filtering performance.
2Adaptability or versatility
If the number of frequency bands and carrier aggregations is increased, then device compatibility and data rates are improved, but insertion loss increases and operational range is reduced
Solution Approach 1:
The antenna system is configured to support multiple frequency bands and carrier aggregation combinations (e.g., Band 1+3, Band 3+5, Band 1+5) using a single antenna interface. The filtering arrangement includes band-specific filters that can be selectively activated based on the operating mode, allowing the system to maintain low insertion loss while supporting diverse band combinations and improving device compatibility across different operators and geographical areas.
3Adaptability or versatility
If complicated switching arrangement is used to support multiple bands, then adaptability to different frequency bands is improved, but insertion loss increases and device performance is reduced
Solution Approach 1:
The switching arrangement is designed to dynamically reconfigure filter connections based on the active carrier aggregation mode. The system can adaptively switch between different filtering configurations (e.g., connecting FDD filters for Band 1, TDD filters for Band 3, or combinations thereof) without requiring complex permanent connections for all possible band combinations. This dynamic reconfiguration minimizes insertion loss by activating only the necessary filtering paths for the current operating mode.
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
This approach allows for efficient operation across multiple frequency bands with reduced insertion loss, enhancing device performance and compatibility with various operators and geographical areas, while avoiding the need for extensive cell re-planning.
Implementation Method 1
band specific frequency selective filtering is required for component carriers
Data Source
AI summary
An RF front end arrangement comprises first filtering, second filtering, third filtering, fourth filtering and a switching arrangement. The switching arrangement is configured to selectively connect the filtering to plural antennas such that at a particular time the first and third filtering is connected to a first antenna and the second and fourth filtering is connected to a second antenna. This allows filtering with different frequency response characteristics to be in use simultaneously for the same frequency band. This can reduce the insertion loss associated with a signal path.