Flat Antenna Array for Polarization Determination
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Solution Overview
Problem
Current methods for determining the polarization of electromagnetic waves, especially at higher frequencies above 30 GHz, face challenges due to the need for complex and error-prone mechanical adjustments, phase noise issues, and the lack of suitable mixers for generating intermediate frequencies, making accurate and portable measurements difficult.
Innovation Solution
A device with a flat arrangement of at least six antennas and power detectors on a substrate, which detects horizontally, vertically, circularly, and linearly polarized components without mechanical moving parts, using an evaluation unit to determine polarization without intermediate frequency conversion, allowing for precise and portable measurements up to 5 THz.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If optical polarization filters and mechanically moving elements are used to determine polarization, then measurement capability is achieved, but device complexity increases and measurement precision deteriorates due to fine adjustment requirements and error-prone mechanical elements
Solution Approach 1:
The patent replaces mechanical polarization filters and moving elements with a fixed antenna array configuration. Six antennas with specific polarizations (horizontal, vertical, left-circular, right-circular, +45° linear, -45° linear) are arranged on a substrate to detect polarization components simultaneously without mechanical adjustment, eliminating mechanical errors while maintaining measurement capability
Solution Approach 2:
The incident electromagnetic wave's polarization is segmented into six distinct polarization components, each detected by a dedicated antenna. This segmentation allows simultaneous measurement of all polarization states without mechanical movement, improving both precision and device simplicity
2Adaptability or versatility
If cross-polarized antennas with mixers are used to determine polarization, then polarization determination is achieved, but device complexity increases and reliability deteriorates due to phase noise and lack of suitable mixers at high frequencies
Solution Approach 1:
The patent replaces the mixer-based intermediate frequency conversion system with direct power detection using six antennas with different polarizations. This substitution eliminates the need for phase-sensitive mixing operations, removing the source of phase noise and reliability issues at high frequencies while maintaining polarization determination capability
Solution Approach 2:
The patent changes the detection parameter from phase difference (which requires mixers and is sensitive to phase noise) to power ratio measurement. By measuring the power received by each antenna with known polarization, the system determines polarization states through power ratios, which are insensitive to phase fluctuations and suitable for high-frequency operation
3Adaptability or versatility
If beam splitters or optical polarization filters are used to spatially split electromagnetic waves, then polarization components can be measured, but measurement precision deteriorates due to introduced errors
Solution Approach 1:
Instead of spatially splitting the wave using beam splitters, the patent segments the polarization information by using six antennas with different polarization orientations. Each antenna selectively receives a specific polarization component, achieving segmentation in the polarization domain rather than spatial domain, thus avoiding beam splitter errors
Solution Approach 2:
The antenna array serves multiple functions simultaneously: it acts as six different polarization filters, six receiving antennas, and six power detectors in a single integrated structure. This multi-functionality eliminates the need for separate beam splitters and polarization filters, reducing error sources while maintaining the ability to measure all polarization components
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
Enables accurate and portable polarization determination of electromagnetic waves in the higher frequency range without spatial splitting or phase measurement errors, facilitating compact and efficient devices for spatially resolved measurements.
Implementation Method 1
each of the six antennas is assigned to exactly one of the six power detectors... designed to detect the power of a horizontally linearly polarized component... vertically linearly polarized component... circularly polarized component
Data Source
Figure 1~2
AI summary
The invention relates to a device and a method for determining polarization, in which at least six antennas 1, 2, 3, 4, 5, 6 and at least six power detectors 7 are arranged planarly on the surface of a substrate 8 or are embedded in the substrate 8, and each antenna 1, 2, 3, 4, 5, 6 is assigned exactly one of the power detectors 7. The antennas 1, 2, 3, 4, 5, 6 and power detectors 7 are configured, when irradiated with an electromagnetic wave, to detect the power of certain components of this incident electromagnetic wave, from which an evaluation unit 12 determines the polarization of the electromagnetic wave.A first antenna 1 and first power detector 7 are configured to detect the power of a horizontally linearly polarized component, a second antenna 2 and second power detector 7 the power of a vertically linearly polarized component, a third antenna 3 and third power detector 7 the power of a left-circularly polarized component, a fourth antenna 4 and fourth power detector 7 the power of a right-circularly polarized component, a fifth antenna 5 and fifth power detector 7 the power of a component polarized at an angle of +45° to the vertically polarized component, and a sixth antenna 6 and sixth power detector 7 the power of a component polarized at an angle of -45° to the vertically polarized component.