Dual-Feed Polarized Antenna for Cross-Polarization Isolation
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Solution Overview
Problem
Existing antennas struggle with cross polarization interference and signal isolation, particularly in radar and communication systems, which affects beamforming and Multiple Input, Multiple Output (MIMO) techniques.
Innovation Solution
A dual polarized antenna with a dual feed system, utilizing orthogonal linear slots and trapezoidal waveguide adapters to generate orthogonal standing waves, providing high isolation and independent radiation modes for horizontal and vertical polarizations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single antenna is used for both polarizations, then device complexity is reduced, but cross polarization interference increases
Solution Approach 1:
The waveguide is segmented into two independent feed systems (first feed and second feed) that are orthogonally positioned, allowing separate control of horizontal and vertical polarizations while maintaining a single integrated antenna structure
Solution Approach 2:
The solution introduces spatial dimensionality by positioning feeds orthogonally (one horizontal, one vertical) and using correspondingly oriented linear slots, thereby separating polarization modes in three-dimensional space to eliminate interference
2Object-affected harmful factors
If orthogonal feeds are used for dual polarization, then cross polarization isolation is improved, but device complexity increases
Solution Approach 1:
Two separate feed systems for orthogonal polarizations are merged into a single waveguide structure with shared walls and integrated radiating face, reducing overall system complexity while maintaining isolation
Solution Approach 2:
The waveguide structure serves multiple functions simultaneously: it provides the radiation cavity, contains both orthogonal feeds, supports both polarization modes, and provides the radiating face with linear slots for both horizontal and vertical emissions
3Manufacturing precision
If linear slots are used for polarized emitters, then manufacturing precision is improved, but signal isolation deteriorates
Solution Approach 1:
Linear slots are selectively positioned and oriented with specific local characteristics (horizontal orientation for first feed, vertical orientation for second feed) to optimize each polarization's radiation pattern while maintaining overall signal isolation
Solution Approach 2:
The linear slots exhibit asymmetric orientation relative to the waveguide geometry, with horizontal slots aligned to the first feed and vertical slots aligned to the second feed, creating directional radiation patterns that enhance polarization isolation
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 achieves high cross polarization isolation, reduced interference, and enhanced signal separation, enabling effective beamforming and MIMO operations with improved object detection and resolution.
Implementation Method 1
a waveguide having a first rectangular face at an end, a second rectangular face at a second opposite end, and a radiating face between the first rectangular face and the second rectangular face
Implementation Method 2
A first plurality of polarized emitters on the radiating face are arranged in a first line along the radiating face to emit the first radio signal
Implementation Method 3
utilizing orthogonal linear slots and trapezoidal waveguide adapters to generate orthogonal standing waves, providing high isolation and independent radiation modes for horizontal and vertical polarizations
Implementation Method 4
a first waveguide adapter is coupled between the first feed and the waveguide, wherein the first waveguide adapter is configured as a reflector of the second radio signal from the second feed into the waveguide
Data Source
AI summary
A dual polarized antenna is described with a dual feed that is suitable for cross polarization isolation. In an example, an antenna has a waveguide having a first rectangular face at an end, a second rectangular face at a second opposite end, and a radiating face between the first rectangular face and the second rectangular face. A first feed is configured to feed a first radio signal having a first polarization into the waveguide. A second feed is configured to feed a second radio signal having a second polarization orthogonal to the first polarization into the waveguide. A first plurality of polarized emitters on the radiating face are arranged in a first line along the radiating face to emit the first radio signal, and a second plurality of polarized emitters on the radiating face are arranged in a second line along the radiating face to emit the second radio signal.