Proximal Duplexer and Diplexer Layout for Low-Band Carrier Aggregation
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Solution Overview
Problem
Existing radio telecommunications apparatus face challenges in simultaneously transmitting in one frequency range and receiving in multiple different frequency ranges, leading to self-interference issues, particularly in low-band low-band carrier aggregation scenarios, which are not effectively addressed by current technologies without increasing die size and cost.
Innovation Solution
The apparatus employs proximal and remote filter circuitry configurations, including duplexers and bandpass filters, to isolate transmission and reception bands, allowing simultaneous operation with improved isolation and reducing self-interference, while avoiding the need for additional power amplifiers in diversity modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If filter circuitry is placed proximal to the power amplifier circuitry, then isolation between transmission and reception bands is improved, but device complexity increases due to the need for multiple filter components
Solution Approach 1:
The patent combines multiple filter functions (duplexer for frequency separation and bandpass filter for band selection) into a single proximal filter circuitry module located near the power amplifier. This integration achieves effective isolation between transmission and reception bands while managing the complexity through functional consolidation rather than separate discrete components.
Solution Approach 2:
The proximal filter circuitry acts as an intermediary between the power amplifier circuitry and the remote filter circuitry, providing initial signal conditioning and isolation close to the noise-generating power amplifier. This intermediate filtering stage reduces self-interference before signals proceed to remote filtering stages.
2Adaptability or versatility
If multiple filter circuitries are used for multiple frequency bands, then adaptability for carrier aggregation is improved, but device complexity and PCB area increase
Solution Approach 1:
The filter circuitry is designed with universal functionality to support multiple frequency bands and carrier aggregation configurations. The proximal and remote filter circuitries work together to provide adaptable filtering for different band combinations, enabling the system to handle various carrier aggregation scenarios without requiring completely separate filter sets for each configuration.
Solution Approach 2:
The filtering function is segmented into proximal filter circuitry (near the power amplifier) and remote filter circuitry (near the antenna), with each segment handling specific filtering tasks. This segmentation allows the system to achieve multi-band support and carrier aggregation capability while distributing the complexity across separate functional modules rather than concentrating all filtering requirements in a single complex unit.
3Reliability
If proximal filter circuitry is used for transmission and reception in multiple bands, then receiver sensitivity is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges transmission and reception filtering functions for multiple bands into a single proximal filter circuitry unit. This consolidation improves receiver sensitivity by providing effective isolation close to the power amplifier while potentially reducing manufacturing costs compared to using separate filter components for each function and band.
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 enables efficient frequency division duplex operation and carrier aggregation with reduced self-interference, optimizing PCB real estate and cost, and improving receiver sensitivity in low-band low-band combinations.
Implementation Method 1
a proximal duplexer configured for the transmission bandwidth of the first band and the reception bandwidth of the first band
Implementation Method 2
a proximal bandpass filter for the reception bandwidth of the second band
Implementation Method 3
a proximal diplexer for isolating the transmission bandwidth of the first band and the reception bandwidth of the second band
Data Source
Figure 1~2
Figure 3A~3B
Figure 4
AI summary
An apparatus comprising: power amplifier circuitry; proximal filter circuitry proximal to the power amplifier circuitry; means for routing output of the power amplifier circuitry to the proximal filter circuitry to be filtered for transmission; means for routing output of the power amplifier circuitry to remote filter circuitry remote from the power amplifier circuitry to be filtered for transmission; wherein the proximal filter circuitry is configured to provide for transmission in a transmission bandwidth of a first band, reception in a reception bandwidth of the first band and reception in a reception bandwidth of the second band and comprises a proximal duplexer configured for the transmission bandwidth of the first band and the reception bandwidth of the first band, a proximal bandpass filter for the reception bandwidth of the second band and a proximal diplexer for isolating the transmission bandwidth of the first band and the reception bandwidth of the second band.