TV Antenna Reflector Geometry for UHF Coverage and Impedance
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Solution Overview
Problem
Existing digital terrestrial TV antennas struggle to efficiently cover UHF channels E-21 to E-60 within the 470 MHz to 790 MHz band while maintaining compactness and impedance matching.
Innovation Solution
A digital terrestrial TV reception antenna design featuring reflector elements arranged on converging geometric planes and a dipole in the bisector, with additional reflector elements on a curved oval surface closer to the dipole, enhancing impedance matching and gain, and allowing for reduced angle and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If reflector elements are arranged on converging geometric planes, then the antenna can cover UHF channels, but the antenna size becomes large and impedance matching is difficult
Solution Approach 1:
The patent applies local quality by creating two distinct zones with different reflector element arrangements: a central area with a curved geometric surface for impedance matching and gain optimization, and peripheral areas with converging geometric planes for channel coverage. This localized differentiation allows each region to perform its specific function optimally without compromising the other.
Solution Approach 2:
The patent segments the reflector elements into two functional groups: central reflector elements arranged on a curved surface closer to the dipole, and peripheral reflector elements arranged on converging geometric planes. This segmentation enables independent optimization of each group's position and arrangement to achieve both compactness and broad channel coverage.
2Adaptability or versatility
If reflector elements are arranged on converging geometric planes, then the antenna can cover UHF channels, but the impedance matching becomes difficult
Solution Approach 1:
The patent applies local quality by creating two distinct zones with different reflector element arrangements: a central area with a curved geometric surface for impedance matching and gain optimization, and peripheral areas with converging geometric planes for channel coverage. This localized differentiation allows each region to perform its specific function optimally without compromising the other.
3Volume of moving object
If the angle of converging planes is reduced for compactness, then the antenna becomes more compact, but the gain and impedance matching deteriorate
Solution Approach 1:
The patent segments the reflector elements into two functional groups: central reflector elements arranged on a curved surface closer to the dipole, and peripheral reflector elements arranged on converging geometric planes. This segmentation enables independent optimization of each group's position and arrangement to achieve both compactness and broad channel coverage.
Solution Approach 2:
The patent changes the geometric parameters of the reflector element arrangements by introducing a curved geometric surface with specific curvature radius in the central area, different from the converging plane angles in the peripheral areas. This parameter differentiation allows optimization of gain and impedance matching while maintaining compact overall dimensions.
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 effectively covers UHF channels E-21 to E-60, improving gain and compactness, and aligns with new DTT antenna characteristics by optimizing reflector element distribution.
Implementation Method 1
a plurality of reflector elements arranged on two converging geometric planes and a dipole arranged in the bisector of said geometric planes
Data Source
Figure 1~2
Figure 3
AI summary
Digital terrestrial TV reception antenna comprising a plurality of reflector elements (2) arranged on two converging geometric planes (α,β) and a dipole (4) arranged in the bisecting line (θ) of said geometric planes (α,β). The antenna also comprises a plurality of reflector elements (3) in a central area which, instead of being arranged on said converging geometric planes (α,β), are arranged at points closer to the dipole (4).