Dual-Polarization Antenna Feed Structure for Compact Isolation
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Solution Overview
Problem
Existing dual polarization antennas face challenges in miniaturization, inter-polarization isolation, cross-polarization discrimination, and manufacturing complexity, while requiring improved structural stability for mass production.
Innovation Solution
A dual polarization antenna design featuring a base substrate, power feeding unit, and radiating plate, with intersecting first and second feeding substrates that supply reference and reverse phase signals to specific points on the radiating plate, utilizing waterproof adhesion technology (WAT) and adhesive tape patterns, and a compact radiating plate configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a dual polarization antenna uses a single antenna element to transmit and receive two electromagnetic wave signals, then the antenna size is reduced, but the inter-polarization isolation and cross-polarization discrimination become difficult to maintain
Solution Approach 1:
The feeding unit is segmented into first and second feeding substrates that are disposed perpendicular to each other. Each feeding substrate independently feeds one polarization direction, allowing separate control of signal paths for different polarizations. This segmentation maintains inter-polarization isolation while using a single radiating element, resolving the contradiction between miniaturization and isolation performance.
Solution Approach 2:
The feeding substrates are arranged in a perpendicular spatial configuration, utilizing three-dimensional space rather than planar expansion. The first feeding substrate extends in one dimension while the second extends perpendicularly in another dimension, enabling dual polarization functionality without increasing the overall antenna footprint, thus maintaining both compact size and isolation performance.
2Productivity
If the number of antennas is increased to enhance channel capacity, then data transmission capacity is improved, but the space occupied by antenna modules increases
Solution Approach 1:
A single antenna element performs multiple functions by supporting dual polarization modes through the perpendicular feeding substrates. The radiating plate serves as both the radiating element for horizontal polarization and vertical polarization simultaneously, eliminating the need for separate antenna elements for each polarization, thus achieving high data transmission capacity with reduced spatial occupation.
Solution Approach 2:
The first and second feeding substrates are merged into a single integrated power feeding unit that supports both polarizations. The feeding unit combines multiple signal paths and impedance matching circuits into one compact structure, enabling multi-functionality while minimizing the overall antenna module space.
3Reliability
If complex signal wiring and process connections are used to achieve dual polarization, then polarization performance is improved, but manufacturing complexity increases
Solution Approach 1:
The first and second feeding substrates are designed with homogeneous structural characteristics, both being substrate-supported transmission line structures. This homogeneity simplifies the manufacturing process by using consistent fabrication techniques for both polarization paths, reducing overall device complexity while maintaining dual polarization performance through symmetric design.
Solution Approach 2:
The feeding substrates are disposed perpendicular to each other, creating an asymmetric three-dimensional configuration that simplifies signal routing. This asymmetric arrangement naturally separates the signal paths for different polarizations in space, reducing the need for complex wiring and making the manufacturing process more straightforward compared to planar configurations.
4Ease of manufacture
If traditional antenna structures are used, then manufacturing processes are established, but structural stability and ease of mass production are insufficient
Solution Approach 1:
The feeding substrates utilize thin film structures that can be easily manufactured using standard PCB or flexible circuit techniques. These thin film feeding substrates provide adequate mechanical support while allowing for high-volume production through conventional lamination and etching processes, improving both structural stability and ease of mass production.
Data Source
AI summary
A dual polarization antenna is disclosed in at least one embodiment of the present disclosure, including a base substrate, a power feeding unit supported on the base substrate, and a radiating plate supported on the power feeding unit, wherein the first feeding substrate includes a first insulating substrate supported on the base substrate, and a first feed line attached to the first insulating substrate and configured to supply a first reference phase signal to a first point on the radiating plate and to supply to a second point on the radiating plate, a first reverse phase signal having a reverse phase relative to the first reference phase signal, and wherein the second feeding substrate includes a second insulating substrate supported on the base substrate, and a second feed line attached to the first insulating substrate and configured to supply a second reference phase signal to a third point on the radiating plate and to supply to a fourth point on the radiating plate, a second reverse phase signal having a reverse phase relative to the second reference phase signal.