RF Front-End Circuit With Diplexer Filtering for Antenna Reduction
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Solution Overview
Problem
Current multi-antenna communication systems in electronic devices face challenges in optimizing limited space due to the increasing number of antennas required for wireless transmission, such as wireless wide area network, wireless local area network, and global navigation systems, which are typically designed to be compact.
Innovation Solution
A radio frequency front-end circuit incorporating a first diplexer, an extractor with band pass filters and a band rejection filter, and a second diplexer to separate and combine signals across multiple bands, reducing the need for multiple antennas by integrating functions within a single antenna.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple antennas are equipped to meet various wireless transmission requirements, then the wireless communication performance is improved, but the device size and complexity increase
Solution Approach 1:
The patent implements a multi-functional antenna system where a single antenna structure supports multiple wireless communication standards (WWAN, WLAN, GPS, GLONASS, Galileo, BDS) across different frequency bands. The antenna is designed to handle both transmission and reception functions, as well as support multiple operating modes simultaneously, thereby reducing the total number of antennas while maintaining comprehensive wireless communication capability
Solution Approach 2:
The patent combines multiple diplexers and filters into an integrated radio frequency front-end circuit architecture. The first diplexer separates WWAN signals into low-mid-high bands and ultra-high bands, while the second diplexer further processes these signals. Multiple band-pass filters and a band-rejection filter are merged into a unified signal processing path, allowing a single antenna to access multiple frequency bands and communication systems through coordinated operation of these combined components
2Adaptability or versatility
If multiple antennas are used to support multiple communication systems, then the adaptability is improved, but the available design space is reduced
Solution Approach 1:
The antenna system is designed as a universal platform that can simultaneously support Wireless Wide Area Network (WWAN), Wireless Local Area Network (WLAN), Global Positioning System (GPS), Global Navigation Satellite System (GLONASS), European Geostationary Navigation Overlay Service (Galileo), and BeiDou Navigation Satellite System (BDS). This multi-functional design allows a single antenna structure to provide adaptability across all these communication systems without requiring separate dedicated antennas for each system
Solution Approach 2:
The patent merges multiple signal processing functions into a consolidated radio frequency front-end circuit. The first diplexer combines low-mid-high band filtering and ultra-high band filtering in one component, while the second diplexer integrates further signal separation and routing functions. Multiple band-pass filters targeting different GPS/GLONASS/Galileo/BDS frequency bands are combined with a band-rejection filter in a unified extractor module, creating a space-efficient architecture that maintains broad communication system compatibility
3Reliability
If the number of radio frequency components is increased to handle multiple bands, then the signal processing capability is improved, but the device complexity and space consumption increase
Solution Approach 1:
The patent merges multiple diplexers and filters into an integrated radio frequency front-end circuit architecture. The first diplexer combines low-mid-high band filtering and ultra-high band filtering in one component, while the second diplexer integrates further signal separation and routing functions. Multiple band-pass filters targeting different GPS/GLONASS/Galileo/BDS frequency bands are combined with a band-rejection filter in a unified extractor module, creating a space-efficient architecture that maintains broad communication system compatibility
Solution Approach 2:
The radio frequency signal processing is segmented into distinct functional stages handled by different components. The first diplexer segments the incoming signal into low-mid-high bands and ultra-high bands. The extractor further segments these bands using band-pass filters for specific navigation satellite systems and a band-rejection filter for WWAN signals. The second diplexer performs additional segmentation and routing. This segmented approach allows complex multi-band processing through coordinated simple components rather than one monolithic complex component
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 approach reduces the number of antennas and radio frequency components, freeing up design space while maintaining performance by effectively handling multiple wireless communication bands.
Implementation Method 1
the first diplexer is configured to separate the radio frequency signal into a first signal within low, mid and high bands of a wireless wide area network and a second signal within an ultra-high band of the wireless wide area network
Implementation Method 2
The two band pass filters are configured to extract two global navigation system signals within two global navigation system bands from the first signal
Implementation Method 3
The band rejection filter is configured to allow a third signal within the mid and high bands of the wireless wide area network in the first signal to pass
Data Source
AI summary
A radio frequency front-end circuit includes a first diplexer, an extractor, and a second diplexer. First diplexer is coupled to an antenna for receiving a radio frequency signal and configured to separate radio frequency signal into a first signal within low, mid and high bands of a wireless wide area network and a second signal within an ultra-high band of WWAN. Extractor is coupled to first diplexer. Extractor includes two band pass filters and a band rejection filter. Two band pass filters are configured to extract two global navigation system signals within two global navigation system bands from first signal. Band rejection filter is configured to allow a third signal within the mid and high bands of WWAN in first signal to pass. Second diplexer is coupled to first diplexer and extractor and configured to combine second and third signals into a WWAN signal.