Orthogonal Dipole Antenna for Broadband MIMO and Radar
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Solution Overview
Problem
Existing antenna systems fail to provide high broadband capability, mechanical stability, and efficient multi-functionality, especially in mobile and maritime applications, due to limitations in frequency range, polarization, and radar reflectivity, with previous designs being inefficient and unsuitable for MIMO technologies and harsh environmental conditions.
Innovation Solution
A multi-function antenna system with a radar reflector featuring bipolar radiating elements arranged symmetrically and orthogonally, connected via slot/plug technology, and equipped with filters for signal reflection, allowing for omnidirectional emission and high polarization purity across a wide frequency range, while maintaining mechanical stability and decoupling between polarizations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional monopole antennas with ground planes are used, then omnidirectional radiation is achieved, but the bandwidth is limited and VSWR is poor (1:2.5)
Solution Approach 1:
The antenna is divided into multiple dipole elements arranged in specific geometries (e.g., orthogonal dipoles, tetrahedral configurations). Each dipole contributes to different frequency ranges and polarization components, collectively achieving ultra-wideband operation with maintained VSWR performance across the entire bandwidth.
Solution Approach 2:
The patent transitions from traditional 2D planar monopole structures to 3D spatial arrangements of dipole elements. This dimensional expansion enables omnidirectional radiation in three-dimensional space while achieving broadband performance through constructive interference patterns from multiple elements oriented in different directions.
2Adaptability or versatility
If antennas are designed for single polarization and frequency range, then simple structure is achieved, but multi-functionality for MIMO and various communication standards is lost
Solution Approach 1:
The antenna system is designed as a universal multi-functional platform that supports multiple communication standards (4G LTE, 5G, Wi-Fi, Bluetooth) and MIMO operations simultaneously. Multiple dipole elements with different orientations and feeding mechanisms enable the same physical structure to serve diverse functions across frequency bands from 70 MHz to 11 GHz.
Solution Approach 2:
The patent combines multiple dipole elements with different polarizations (horizontal, vertical, circular) and frequency responses into a single integrated antenna system. This merging of elements allows the antenna to handle multiple signal types and polarizations concurrently, eliminating the need for separate antennas for different functions.
3Reliability
If radar reflectors are added to increase radar cross section, then visibility is improved, but device complexity and space requirements increase
Solution Approach 1:
The dipole antenna elements serve dual functions: they act as active radiating elements for communication and simultaneously function as passive radar reflectors. The conductive dipole structures naturally reflect radar signals back to the source, providing enhanced radar visibility without requiring separate radar reflector components.
Solution Approach 2:
The patent merges the communication antenna function with the radar reflector function into a single integrated system. The same dipole elements that transmit and receive communication signals also serve as reflective surfaces for radar, eliminating the need for additional radar-specific components and reducing overall system complexity.
4Volume of moving object
If antenna elements are placed close together to save space, then compact design is achieved, but mutual coupling and isolation between elements deteriorate
Solution Approach 1:
The patent utilizes three-dimensional spatial separation and orthogonal orientations of dipole elements to achieve isolation without increasing overall footprint. Elements are arranged in 3D configurations (e.g., orthogonal dipoles, tetrahedral arrangements) that provide natural decoupling through spatial separation and geometric isolation, maintaining compact form factor while minimizing mutual coupling.
Solution Approach 2:
The patent employs asymmetric feeding networks and unequal amplitude/phasing relationships between dipole elements to suppress mutual coupling. By introducing deliberate asymmetries in the feeding structure and signal distribution, the system achieves isolation between closely spaced elements without requiring large physical separations.
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 antenna system achieves efficient transmission and reception of signals across an extremely wide frequency range with low VSWR, enhanced radar cross-section, and protection against radar signals, making it suitable for MIMO applications and maritime environments with improved mechanical stability and adaptability.
Implementation Method 1
at least two bipolar radiating elements... allowing for omnidirectional emission and high polarization purity across a wide frequency range
Implementation Method 2
filters... for reflecting signals from radar transmissions are arranged on the inside of the antenna in the feeding line
Data Source
AI summary
The invention relates to a multi-functional compact antenna system having high broadband capability, comprising a radar reflector that comprises at least two bipolar radiating elements, the radiating elements being symmetrically arranged in a cross-wise manner at an angle of 90°+/−10° and being electrically connected to one another at least at their intersection. The invention provides for an omnidirectional antenna characteristic in the azimuth plane and allows to maximise the radiation in the elevation plane around the elevation angle close to zero degrees.