Diplexer Segmentation for Carrier Aggregation Loss Reduction
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Solution Overview
Problem
Existing duplexer filter systems in wireless devices face significant loss and high costs due to small frequency spacing and sharp filtering requirements, making them inefficient for carrier aggregation communication.
Innovation Solution
The use of diplexers with wider frequency spacing, allowing simultaneous transmission and reception across different cellular frequency bands, reduces filter insertion loss and costs by employing passive bandpass filters and power amplifiers, thereby improving module space and out-of-band attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If duplexers with small frequency spacing are used to support multiple cellular frequency bands, then simultaneous transmission and reception on a common antenna is enabled, but filter insertion loss becomes significant and cost increases
Solution Approach 1:
The system divides the frequency band handling into separate segments by using multiple diplexers, each optimized for specific frequency bands with wider spacing, rather than using a single duplexer for all bands. This segmentation allows each filter to be optimized for its specific frequency range, reducing overall insertion loss.
Solution Approach 2:
The patent transitions from a single-frequency-band duplexer approach to a multi-band diplexer system operating in different frequency dimensions. By using diplexers with wider frequency spacing across multiple bands, the system achieves multi-band support without the insertion loss penalties of tightly-spaced duplexers.
2Adaptability or versatility
If duplexers with small frequency spacing are used to enable carrier aggregation, then simultaneous transmission and reception across frequency bands is achieved, but component cost and power usage increase
Solution Approach 1:
The carrier aggregation functionality is segmented across multiple diplexers, each handling specific frequency bands. This allows the use of cost-effective diplexer components with wider frequency spacing rather than expensive tightly-spaced duplexers, reducing overall component cost while maintaining carrier aggregation capability.
Solution Approach 2:
The system changes the frequency spacing parameter from small (in duplexers) to large (in diplexers), which fundamentally alters the cost characteristics. Diplexers with wider frequency spacing are inherently less expensive to manufacture while still enabling carrier aggregation when multiple bands are combined.
3Measurement precision
If sharp filtering requirements are implemented in duplexer systems, then frequency band separation is improved, but filter insertion loss and device complexity increase
Solution Approach 1:
The filtering function is segmented across multiple diplexers, each responsible for specific frequency bands. This segmentation allows each filter to be simpler in design while achieving adequate separation for its specific band, reducing overall system complexity compared to a single complex duplexer system.
Solution Approach 2:
By changing the frequency spacing parameter to larger values in diplexers, the filtering requirements become less stringent compared to tightly-spaced duplexers. This parameter change simplifies the filter design while maintaining adequate frequency band separation for carrier aggregation operation.
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 solution reduces transmission filter insertion loss, decreases heat dissipation, and extends battery life by using smaller, lower-cost power amplifiers and improving the design of diplexers for better performance in carrier aggregation systems.
Implementation Method 1
The first diplexer is configured to filter a first transmit signal received at the first transmit terminal to a first cellular frequency band and output the filtered first transmit signal at the first common terminal. The first diplexer is further configured to filter a first receive signal received at the first common terminal to a second cellular frequency band
Data Source
AI summary
A multiplexing system can include a first diplexer and a second diplexer. The first diplexer can have a first transmit terminal, a first receive terminal, and a first common terminal. The first diplexer can be configured to filter a first transmit signal to a first cellular frequency band and output the filtered first transmit signal. The first diplexer can be further configured to filter a first receive signal to a second cellular frequency band and output the filtered first receive signal. The second diplexer can have a second transmit terminal, a second receive terminal, and a second common terminal. The second diplexer can be configured to filter a second transmit signal to the second cellular frequency band and output the filtered second transmit signal. The second diplexer can be further configured to filter a second receive signal to the first cellular frequency band and output the filtered second receive signal.