Compact V-Dipole Antenna with Flat Reflector for Wideband Omnidirectional Coverage
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Solution Overview
Problem
Existing broadband antenna structures with multiple dipoles have narrow operating frequency bands and large sizes, leading to degraded radiation and gain performance when grouped, making them unsuitable for wide frequency coverage and omnidirectional radiation patterns.
Innovation Solution
A compact antenna structure featuring two symmetrical dipoles with V-shaped metal horns and a flat reflector, where the reflector's size is limited to half the wavelength of the low-frequency band, and the horns and feet are designed to be shorter than a quarter wavelength, allowing for better omnidirectionality and reduced bulk, enabling grouping of structures for wide frequency coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the reflector dimensions are made much larger than half wavelength to achieve good radiation performance at low frequency, then the radiation performance is improved, but the antenna structure size becomes too large for omnidirectional operation at doubled frequency
Solution Approach 1:
The patent changes the operating frequency parameter to enable the same reflector size to serve dual purposes: at low frequency it provides adequate reflection area, while at doubled frequency the reduced wavelength makes the same physical dimensions appropriate for omnidirectional radiation patterns
2Adaptability or versatility
If several antenna structures are grouped together to improve coverage, then the coverage is improved, but the radiation and gain performances are greatly degraded
Solution Approach 1:
The patent divides the antenna system into multiple identical modular units, each with optimized dimensions for omnidirectional operation. This segmentation allows the structures to be grouped for enhanced coverage while each unit maintains its radiation and gain performance characteristics independently
3Ease of manufacture
If the antenna structure dimensions are reduced to allow grouping, then the ease of grouping is improved, but the radiation performance at low frequency may be degraded
Solution Approach 1:
The patent utilizes frequency-dependent parameter relationships where the same physical dimensions provide appropriate electrical sizes at both low frequency for radiation and at doubled frequency for omnidirectional patterns, enabling compact grouping without sacrificing low-frequency performance
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 design achieves controlled radiation patterns and improved gain over octave bandwidths, allowing for efficient grouping of antenna structures to provide omnidirectional coverage across a wide frequency range while maintaining a compact size.
Implementation Method 1
The antenna structure can be used in reception for the interception of radio signals, or in transmission for the broadcasting of radio signals, in particular in the VHF and UHF bands
Implementation Method 2
an antenna structure according to the invention comprising a flat reflector, two dipoles symmetrical with respect to a plane of symmetry perpendicular to the reflector
Data Source
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AI summary
The invention relates to a compact antenna structure having a wide frequency band of at least one octave, comprising a flat square reflector (3) having sides equal to at most half the wavelength ? corresponding to the low frequency of the band, two symmetrical V dipoles (11 -12; 21 -22) associated with linear polarization and each having two metal horns, and hollow metal feet (13, 14; 23, 24) transverse to the horns. The dipoles are contained in the reflector by perpendicular projection onto the reflector. The horns and the feet have lengths less than ?/4. A coaxial feed network (4; 5) extends within the foot (13; 23) of one (11; 21) of the horns of each dipole and within the dipoles to feed the dipoles in phase. The antenna structure can be used in a group of antenna structures having dual polarization and an omnidirectional radiation diagram.