Multi-Band LNA Input Matching for Compact Phased Arrays
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Solution Overview
Problem
Conventional multi-band phased arrays use multiple single-band receivers, leading to a large area and interference challenges in implementing inter-band carrier aggregation, particularly in high-frequency wireless communication systems like 5G NR and vehicle-mounted radars.
Innovation Solution
A multi-band low noise amplifier (LNA) with dual input matching networks and amplifiers, phase shifters, and a shared antenna feed point, designed to minimize interference and reduce circuit area by using frequency-selective matching networks and phase shift branches for different bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple single-band receivers are used to support multiple bands, then multi-band functionality is achieved, but the device area becomes excessively large
Solution Approach 1:
The patent merges multiple single-band receiver functions into a single multi-band receiver by integrating multiple input matching networks and amplifiers that can operate across different frequency bands. The shared antenna feed point and common signal processing path further consolidate the structure, achieving multi-band support in a compact form factor that eliminates the need for separate single-band receivers for each band.
Solution Approach 2:
The multi-band receiver is designed with universal functionality to handle multiple frequency bands simultaneously. The input matching networks are configured to support different bands (e.g., n257, n258, n260, n261), and the amplifiers are designed to amplify signals across these bands. This universal design allows a single receiver to perform the functions that would otherwise require multiple dedicated single-band receivers.
2Adaptability or versatility
If multiple single-band receivers are used for inter-band carrier aggregation, then carrier aggregation capability is achieved, but interference between bands occurs
Solution Approach 1:
The receiver is segmented into multiple independent signal paths, each with its own input matching network and amplifier configured for specific frequency bands. This segmentation allows simultaneous reception of multiple bands without mutual interference, as each band has a dedicated processing path. The segmented architecture enables inter-band carrier aggregation while maintaining signal isolation between bands.
Solution Approach 2:
The input matching networks act as intermediaries that selectively couple different frequency bands to their respective amplifiers. These matching networks are designed to pass specific band frequencies while attenuating others, thereby mediating the signal flow to prevent inter-band interference. This intermediary function enables clean separation of band signals even though they share a common antenna feed point.
3Reliability
If frequency-selective matching networks are used to reduce interference, then anti-interference performance is improved, but circuit complexity increases
Solution Approach 1:
Each input matching network is designed with local quality optimized for its specific frequency band. The matching networks use band-specific component values and topologies tailored to their assigned bands (e.g., n257, n258, n260, n261). This localized optimization provides excellent anti-interference performance for each band while keeping the overall circuit manageable through modular design, where each matching network is a self-contained unit.
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 enables a miniaturized phased array with improved anti-interference performance, reduced design complexity, and efficient utilization of frequency resources across multiple bands, enhancing signal reception and transmission in high-frequency wireless communication systems.
Implementation Method 1
The first input matching network is coupled between the input end and the first amplifier, and is configured to implement impedance matching for the first carrier signal
Implementation Method 2
The second input matching network is coupled between the input end and the second amplifier, and is configured to implement impedance matching for the second carrier signal
Implementation Method 3
The first amplifier is configured to amplify a matched first carrier signal
Implementation Method 4
The second amplifier is configured to amplify a matched second carrier signal
Implementation Method 5
The phase shifter is configured to perform phase shifting on the first carrier signal output by an output end of the first amplifier
Implementation Method 6
The phase shifter is further configured to perform phase shifting on the second carrier signal output by an output end of the second amplifier
Data Source
AI summary
This application provides a multi-band low noise amplifier, including: an input end, a first input matching network, a second input matching network, a first amplifier, and a second amplifier. The input end is coupled to an antenna and is configured to receive an inter-band carrier aggregation signal, where the inter-band carrier aggregation signal includes a first carrier signal located in a first band and a second carrier signal located in a second band, and the first band is different from and does not overlap the second band. The first input matching network is coupled between the input end and the first amplifier and is configured to perform impedance matching for the first carrier signal. The second input matching network is coupled between the input end and the second amplifier and is configured to perform impedance matching for the second carrier signal.