Phased Array Antenna IM3 Beam Steering for Interference Control
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Solution Overview
Problem
Phased array antennas generate third-order intermodulation products that interfere with communications due to the generation of interfering signals, which are difficult to filter and require expensive, space-consuming, and energy-intensive linearization techniques.
Innovation Solution
A phased array antenna with an amplifier circuit that includes a power amplifier and a third-order intermodulation product control circuit, utilizing a second-order harmonic injection circuit and phase controller to control the orientation of third-order intermodulation products, allowing spatial filtering and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If pre-distortion and linearization techniques are implemented to reduce third-order intermodulation products, then the harmful interference is reduced, but the device complexity, cost, and energy consumption increase
Solution Approach 1:
The patent extracts and controls only the third-order intermodulation products generated by the power amplifier, separating this harmful component from the useful signals. By specifically targeting and managing the intermodulation products through a dedicated control circuit, the solution avoids the need for complex system-wide linearization techniques while effectively reducing the harmful interference.
Solution Approach 2:
The patent introduces a third-order intermodulation product control circuit as an intermediary between the power amplifier and the antenna. This control circuit acts as a mediator that specifically manages the intermodulation products without affecting the useful signals, providing a targeted solution that is simpler and more energy-efficient than comprehensive linearization approaches.
2Object-generated harmful factors
If pre-distortion and linearization techniques are implemented to reduce third-order intermodulation products, then the harmful interference is reduced, but the energy consumption increases
Solution Approach 1:
The patent extracts and controls only the third-order intermodulation products generated by the power amplifier, separating this harmful component from the useful signals. By specifically targeting and managing the intermodulation products through a dedicated control circuit, the solution avoids the need for complex system-wide linearization techniques while effectively reducing the harmful interference.
Solution Approach 2:
The patent introduces a third-order intermodulation product control circuit as an intermediary between the power amplifier and the antenna. This control circuit acts as a mediator that specifically manages the intermodulation products without affecting the useful signals, providing a targeted solution that is simpler and more energy-efficient than comprehensive linearization approaches.
3Object-generated harmful factors
If pre-distortion and linearization techniques are implemented to reduce third-order intermodulation products, then the harmful interference is reduced, but the space occupied in electronic circuits increases
Solution Approach 1:
The patent extracts and controls only the third-order intermodulation products generated by the power amplifier, separating this harmful component from the useful signals. By specifically targeting and managing the intermodulation products through a dedicated control circuit, the solution avoids the need for complex system-wide linearization techniques while effectively reducing the harmful interference.
Solution Approach 2:
The patent introduces a third-order intermodulation product control circuit as an intermediary between the power amplifier and the antenna. This control circuit acts as a mediator that specifically manages the intermodulation products without affecting the useful signals, providing a targeted solution that is simpler and more energy-efficient than comprehensive linearization approaches.
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 effectively reduces the impact of third-order intermodulation products, minimizing interference with other devices while being cost-effective, energy-efficient, and occupying minimal space.
Implementation Method 1
a power amplifier configured to amplify at least two useful signals of different frequencies to be transmitted by the elementary antenna
Implementation Method 2
When a power amplifier generates a plurality of useful signals, it also generates interfering signals. For example, if the power amplifier generates two useful signals of different frequencies f1 and f2, it also generates third-order intermodulation products.
Implementation Method 3
a third-order intermodulation product control circuit configured to control a phase of the third-order intermodulation products generated by the amplifier circuit so as to control an orientation of a radiation of the third-order intermodulation products
Implementation Method 4
A phased array antenna includes a matrix of elementary antennas whereon signals the phase of which is adjusted according to the various elementary antennas are applied so as to obtain a desired radiation pattern for the entire phased array antenna.
Implementation Method 5
A phased array antenna includes a matrix of elementary antennas whereon signals the phase of which is adjusted according to the various elementary antennas are applied so as to obtain a desired radiation pattern
Data Source
AI summary
According to one aspect, a phased array antenna includes a plurality of elementary antennas, and an amplifier circuit for each elementary antenna. The amplifier circuit includes a power amplifier configured to amplify at least two useful signals of different frequencies to be transmitted by the elementary antenna, a third-order intermodulation product control circuit configured to control a phase of third-order intermodulation products generated by the amplifier circuit so as to control an orientation of a radiation of the third-order intermodulation products transmitted by the phased array antenna.