Polarized Radar Antenna Layout Without RF Switch Loss
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Solution Overview
Problem
Existing radar technologies face challenges in efficiently detecting both long-range and short-range objects with high precision and gain, particularly when installed at elevated positions, due to limitations in antenna directivity switching and interference issues with RF switches, which degrade reception sensitivity and antenna gain.
Innovation Solution
The electronic device employs a configuration with multiple reception and transmission antennas having different polarization directions, allowing for adjustable directivity without the need for RF switches, enhancing gain and detection accuracy by synthesizing antenna characteristics in phase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If RF switches are used to switch between reception antennas for changing directivity, then directivity switching is achieved, but reception sensitivity and antenna gain are degraded due to interference issues
Solution Approach 1:
The patent extracts and removes the RF switch component from the antenna system. By eliminating the RF switch, the system avoids the interference issues that degrade reception sensitivity, while still achieving directivity switching through a different mechanism (simultaneous connection to multiple antennas).
Solution Approach 2:
The patent introduces a signal processing unit as an intermediary that processes signals from multiple antennas simultaneously. This mediator enables directivity switching functionality without requiring physical RF switches, thereby maintaining reception sensitivity while achieving adaptability.
2Measurement precision
If single-direction reception antennas are used, then antenna gain is maximized in one direction, but detection capability for objects in multiple directions is limited
Solution Approach 1:
The patent makes the reception system universal by enabling it to detect objects in multiple directions simultaneously. By connecting multiple reception antennas with different directivities to the same signal processing unit, the system gains multi-directional detection capability while maintaining high detection accuracy through synthesized signals.
Solution Approach 2:
The patent merges signals from multiple reception antennas with different directivities in the signal processing unit. This combining of signals allows the system to achieve both high gain (from individual antennas) and multi-directional detection capability (from the array of antennas).
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 configuration enables simultaneous high-gain detection of both long-range and short-range objects by adjusting directivity, improving convenience and accuracy in object detection tasks such as millimeter-wave radar applications.
Implementation Method 1
As a polarization direction of a radio wave received by the first reception antenna becomes closer to a first polarization direction, a gain of reception by the first reception antenna becomes greater
Implementation Method 2
As a polarization direction of a radio wave received by the second reception antenna becomes closer to a second polarization direction different from the first polarization direction, a gain of reception by the second reception antenna becomes greater
Implementation Method 3
a first transmission antenna configured to transmit, using first polarization, a radio wave having a directivity in a first direction
Implementation Method 4
a second transmission antenna configured to transmit, using second polarization, a radio wave having a directivity in a second direction different from the first direction
Data Source
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AI summary
An electronic device includes a first reception antenna having a directivity in a first direction, and a second reception antenna having a directivity in a second direction different from the first direction. As a polarization direction of a radio wave received by the first reception antenna becomes closer to a first polarization direction, a gain of reception by the first reception antenna becomes greater. As a polarization direction of a radio wave received by the second reception antenna becomes closer to a second polarization direction different from the first polarization direction, a gain of reception by the second reception antenna becomes greater.