Band 28 RF Duplexer Segmentation for Overlapping Band Suppression
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Solution Overview
Problem
Existing RF solutions struggle to suppress overlapping bands between Band 28 and Digital Television (DTV) frequencies, leading to difficulties in implementing additional spectrum stray tests due to the inability to effectively manage the 703MHz - 710MHz range, which results in data loss and challenges in meeting full band requirements.
Innovation Solution
The RF device employs a dual-duplexer configuration with a processor-controlled channel switch, where the first duplexer handles the overlapping band (703MHz - 710MHz) and the second duplexer handles the remaining Band 28 frequencies, ensuring the overlapping band is not part of the second duplexer's bandwidth, allowing for effective suppression and meeting full band requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single duplexer is used to cover the full Band 28, then the device complexity is reduced, but the overlapping band (703MHz-710MHz) cannot be suppressed, causing data loss in additional spectrum stray tests
Solution Approach 1:
The patent divides the full Band 28 into two separate bands: Band 1 (703MHz-722MHz) covering the overlapping region, and Band 2 (723MHz-748MHz) for the remaining frequencies. Two separate duplexers are configured, each optimized for their respective bands. This segmentation allows the first duplexer to specifically handle and suppress the overlapping band while the second duplexer handles the remaining frequencies without interference.
2Reliability
If the first duplexer covers the overlapping band (703MHz-710MHz), then the suppression ability is improved, but the additional spectrum stray test cannot be performed due to data loss
Solution Approach 1:
The frequency range is segmented into two non-overlapping bands. Band 1 (703MHz-722MHz) is assigned to the first duplexer which provides suppression capability for the overlapping region. Band 2 (723MHz-748MHz) is assigned to the second duplexer which does not suppress the overlapping band, allowing accurate measurement of additional spectrum stray without data loss.
3Adaptability or versatility
If the second duplexer includes the overlapping band in its bandwidth, then the full band coverage is achieved, but the suppression of the overlapping band is lost
Solution Approach 1:
The overall Band 28 coverage is achieved through segmentation into two bands handled by separate duplexers. The first duplexer covers 703MHz-722MHz with suppression capability for the overlapping band. The second duplexer covers 723MHz-748MHz without suppression, enabling full band coverage while maintaining suppression ability where required.
Solution Approach 2:
Different quality characteristics are applied to different frequency regions. The first duplexer is designed with suppression characteristics specifically for the overlapping band region (703MHz-710MHz). The second duplexer is designed without suppression characteristics, allowing it to accurately measure signals in the 723MHz-748MHz range including additional spectrum stray measurements.
Data Source
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AI summary
A radio frequency (RF) device based on a frequency band "Band 28" and a communication method thereof are provided by the disclosure. The device includes a first duplexer for transceiving a first band signal, a second duplexer for transceiving a second band signal, a processor for selecting a corresponding one of the duplexers to transceive a signal by the channel switch according to a frequency band of the signal. An overlapping band belongs to a first band, frequency test points belong to a second band, a sum of frequency of the first band and the second band fall in Band 28. The second duplexer suppresses the overlapping band, so as to meet the requirement of full band of Band 28.