SAW Filter Bank Receiver for Multi-Channel Radio Selectivity
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Solution Overview
Problem
Current multi-channel radio communication devices face challenges with linear growth in size and complexity, limited frequency hopping capabilities, and high isolation requirements between antennas, particularly in noisy tactical environments, while existing solutions like direct sampling suffer from low selectivity and dynamic range.
Innovation Solution
A multi-channel communication device utilizing a filter bank with narrowband Surface Acoustic Wave (SAW) filters that enables effective separation of reception channels, reduces co-location interferences, and improves selectivity, allowing for a compact and efficient design with reduced ADC dynamic range issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple super heterodyne receivers are used for multi-channel radio, then selectivity capabilities and large dynamic range are improved, but device size and complexity grow linearly with each additional channel
Solution Approach 1:
The patent merges multiple heterodyne receiver channels into a single integrated device. Instead of using separate independent heterodyne receivers for each channel, the invention combines them into one unified receiver architecture that processes multiple frequency bands simultaneously, thereby reducing overall device complexity while maintaining selectivity capabilities.
Solution Approach 2:
The patent creates a universal receiver device capable of handling multiple communication channels and frequency bands within a single unit. This multi-functional receiver can process different waveforms and frequency ranges (including HF, VHF, and UHF bands) without requiring separate dedicated receivers for each channel, thus reducing the linear growth of device complexity.
2Reliability
If multiple super heterodyne receivers are used for multi-channel radio, then dynamic range is improved, but the current required to support additional channels grows linearly
Solution Approach 1:
The patent combines multiple receiver channels into a single integrated architecture that shares common components such as low-noise amplifiers, mixers, and signal processing circuits. This merging reduces the total current consumption compared to having independent receivers for each channel, while still maintaining the large dynamic range required for tactical communications.
3Device complexity
If direct sampling is used for multi-channel radio, then device simplicity and reduction of electronics are improved, but selectivity and dynamic range deteriorate
Solution Approach 1:
The patent segments the signal processing function by introducing a dedicated filter bank stage before the ADC. This segmentation allows the direct sampling architecture to maintain simplicity while adding selective filtering capability that separates different frequency channels before digital conversion, thereby improving selectivity without significantly increasing overall device complexity.
4Device complexity
If direct sampling is used for multi-channel radio, then device simplicity is improved, but dynamic range deteriorates
Solution Approach 1:
The patent segments the received signal into multiple frequency channels using the filter bank before ADC conversion. This segmentation prevents strong signals from overwhelming the ADC and causing dynamic range issues, as each filter channel processes a narrower bandwidth signal independently, thereby extending the effective dynamic range while maintaining the simplicity of the direct sampling architecture.
5Adaptability or versatility
If FDD solution is implemented in multiple heterodyne receivers architecture, then frequency division duplexing is achieved, but high isolation between antennas is required
Solution Approach 1:
The patent merges transmit and receive functions into a single integrated device that handles multiple frequency bands. This unified architecture reduces the isolation requirements between antennas compared to separate heterodyne receivers, as the integrated design can better manage interference and share common components between transmit and receive paths.
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
The solution achieves effective separation of reception channels, reduces interference, and enhances selectivity and dynamic range, enabling a compact and efficient multi-channel radio communication device with improved performance in tactical environments and extended battery life.
Implementation Method 1
A multi-channel communication device utilizing a filter bank with narrowband Surface Acoustic Wave (SAW) filters that enables effective separation of reception channels
Data Source
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AI summary
A multi-channel communication device comprising: a plurality of receivers, each usable for receiving radio-signals within a corresponding distinct selected frequency band within a spectrum; a Radio Frequency (RF) power splitter usable for splitting an input radio- signal into a plurality of split radio-signals; and a filter bank that comprises a plurality of Surface Acoustic Wave (SAW) filters each having a respective distinct passband within the spectrum, and a routing mechanism configured to route each of the split radio-signals into respective selected SAW filters of the SAW filters, selected in accordance with the selected frequency band of each of the receivers, wherein each of the selected SAW filters outputs a corresponding output radio-signal, in the passband of the respective SAW filter, to a respective receiver of the receivers.