RF Front-End Diplexer Circuit for Multi-Band Antenna Sharing
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Solution Overview
Problem
Current design methods for multi-antenna communication systems in electronic devices fail to optimize the limited space due to the increasing number of antennas required for wireless transmission, such as reception of wireless wide area network, wireless local area network, and global navigation system signals.
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 supporting multiple bands with a single antenna.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple antennas are equipped to meet various wireless transmission requirements, then wireless communication performance is improved, but 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 including WLAN (2.4GHz and 5GHz bands), WWAN (sub-6GHz and mmWave bands), and GNSS frequencies. The antenna achieves this through configurable feeding networks and impedance transformation structures that enable operation across different frequency bands, thereby reducing the total number of antennas while maintaining comprehensive wireless communication capability
Solution Approach 2:
The antenna system is divided into multiple independent functional modules, each optimized for specific frequency bands or communication standards. These segmented modules can be independently configured and activated based on operational requirements, allowing the system to achieve multi-band performance through coordinated operation of discrete structural elements rather than requiring separate antennas for each band
2Adaptability or versatility
If multiple antennas are equipped to support multiple wireless standards, then adaptability is improved, but device area increases
Solution Approach 1:
The patent merges multiple antenna functions into a single integrated antenna structure that simultaneously supports WLAN, WWAN, and GNSS operations. The feeding network combines multiple signal paths and impedance transformation circuits into one unified structure, enabling the antenna to adapt to different wireless standards through electronic configuration rather than requiring separate physical antennas for each standard, thereby maintaining high adaptability while minimizing device area
Solution Approach 2:
The antenna design utilizes three-dimensional structural configurations and spatial arrangement of feeding elements to achieve multi-band performance. By employing vertical stacking, inclined orientations, and multi-layer substrate arrangements, the antenna extracts additional functional dimensions from a compact planar footprint, allowing support for multiple wireless standards without proportionally increasing the device's planar area
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 reduces the number of antennas and radio frequency components, freeing up design space and improving performance by enabling a single antenna to support multiple bands, including wireless wide area network and global navigation system signals.
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
Implementation Method 4
the second diplexer is configured to combine the second signal and the third signal into a wireless wide area network signal
Data Source
Figure 1
Figure 2A~2B
Figure 3
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 andhigh 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.