Dielectric-Closed Bow Tie Antenna for Impedance Bandwidth
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Solution Overview
Problem
Existing antenna technologies for receiving high definition television (HDTV) signals lack efficient designs that balance gain, impedance bandwidth, and physical size, often resulting in narrow impedance bandwidth and poor voltage standing wave ratio (VSWR) due to improper phasing and spacing of antenna elements and reflectors.
Innovation Solution
The use of bow tie antennas with dielectric material to close open shapes, combined with strategically positioned reflectors and a balun to ensure phase alignment, enhances impedance bandwidth and gain while maintaining a compact size, and the antenna assembly includes a balun to maintain phasing across a wide frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional antenna designs are used, then the antenna structure is simple, but the impedance bandwidth is narrow and VSWR is poor
Solution Approach 1:
The antenna element is divided into multiple segments with different impedance characteristics. Each segment can be independently tuned to contribute to the overall impedance matching across a wider bandwidth, resolving the contradiction between narrow bandwidth and structural simplicity.
Solution Approach 2:
The patent employs composite structures combining conductive elements with dielectric materials. This composite approach enables broader impedance bandwidth by utilizing the complementary electromagnetic properties of different materials while maintaining a relatively simple overall antenna geometry.
2Object-affected harmful factors
If antenna elements are spaced apart to reduce eye injury risk, then safety is improved, but the gain and radiation efficiency deteriorate
Solution Approach 1:
A dielectric barrier or insulating material is introduced as an intermediary between the spaced-apart antenna elements. This intermediary maintains the safe spacing distance while providing electromagnetic coupling that preserves gain and radiation efficiency, thus resolving the contradiction between safety and performance.
Solution Approach 2:
The patent adjusts electromagnetic parameters such as the dielectric constant of intervening materials or the phase shift between elements to compensate for the spacing effect. By changing these parameters, the system maintains high radiation efficiency even when elements are spaced apart for safety reasons.
3Volume of moving object
If antenna elements are compacted to reduce physical size, then device compactness is improved, but phase alignment and impedance bandwidth worsen
Solution Approach 1:
The patent incorporates adjustable or tunable elements that allow dynamic adjustment of electrical length and phase relationships. This dynamic capability enables the compact antenna to maintain proper phase alignment across different operating conditions despite the reduced physical dimensions.
Solution Approach 2:
By changing electromagnetic parameters such as dielectric constant, conductor thickness, or element geometry, the patent achieves proper phase alignment in a compact configuration. These parameter adjustments compensate for the reduced physical spacing and maintain impedance bandwidth despite the smaller overall size.
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 bow tie antenna assembly achieves improved impedance bandwidth, directivity, and radiation efficiency, providing strong performance across the digital television spectrum with a balanced gain and reduced risk of eye injury from exposed antenna ends.
Implementation Method 1
The open shape is closed by dielectric material disposed between the spaced apart end portions and extending across a gap separating the spaced apart end portions
Implementation Method 2
the antenna assembly includes a balun to maintain phasing across a wide frequency range
Implementation Method 3
combined with strategically positioned reflectors and a balun to ensure phase alignment
Data Source
AI summary
According to various aspects, exemplary embodiments are provided of bow tie antennas and antenna assemblies that include the same. In an exemplary embodiment, a bow tie antenna includes a pair of antenna elements. Each antenna element includes spaced apart end portions defining an open portion such that the antenna element has an open shape. The open shape is closed by dielectric material disposed between the spaced apart end portions and extending across a gap separating the spaced apart end portions, whereby the dielectric material and pair of antenna elements cooperatively define a closed bow tie shape for the bow tie antenna.