Shared-Filter Antenna Duplexer for Multi-Band Miniaturization
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Solution Overview
Problem
Conventional antenna duplexers are difficult to downsize due to the need for multiple transmit and receive filters for each selectable system, leading to increased complexity and size.
Innovation Solution
The antenna duplexer uses a shared third filter for both transmit and receive functions across multiple frequency bands, allowing for the elimination of redundant filters and the sharing of amplifiers, thereby reducing the overall size and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple transmit and receive filters are used for each selectable system, then the antenna duplexer can support multiple frequency bands, but the size and complexity of the device increases
Solution Approach 1:
The patent applies universality by designing the third filter to serve multiple functions across different frequency bands. The third filter is configured to pass both the first frequency band (first transmit and receive bands) and the second frequency band (second transmit and receive bands), allowing a single filter component to replace what would traditionally require multiple separate filters. This multi-functional design directly reduces the overall number of filter components needed in the antenna duplexer.
Solution Approach 2:
The patent merges the functionality of multiple filters into a shared third filter. Specifically, the third filter is combined to handle both the first band's transmit and receive filtering, as well as the second band's transmit and receive filtering. This consolidation of filtering functions into a single shared component reduces the total component count and decreases the physical size of the antenna duplexer while maintaining support for multiple frequency bands.
2Adaptability or versatility
If multiple transmit and receive filters are used for each selectable system, then the antenna duplexer can support multiple frequency bands, but the device complexity increases
Solution Approach 1:
The third filter is designed with universal functionality to operate across multiple frequency bands. It is configured with passbands that include both the first frequency band (first transmit band and first receive band) and the second frequency band (second transmit band and second receive band). This multi-band capability allows the single third filter to replace multiple separate filters, thereby reducing the overall system complexity while maintaining support for multiple selectable frequency bands.
Solution Approach 2:
The patent merges the filtering functions for multiple frequency bands into a single shared third filter. This consolidation reduces the number of discrete filter components from what would traditionally be required (separate filters for each band) to just one shared filter. The merging of these functions simplifies the antenna duplexer's internal architecture and reduces connection complexity between components.
Data Source
AI summary
A small antenna duplexer that includes antenna terminal, first filter electrically connected to this antenna terminal and passing a first frequency band, second filter electrically connected to antenna terminal and passing a second frequency band, and third filter electrically connected to antenna terminal and passing a third frequency band. First filter and third filter are used for one band, and second filter and third filter are used for another band.