Omni-directional Planar Antenna for Digital TV Signal Reception
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Solution Overview
Problem
Conventional indoor TV antennas are unsuitable for receiving digitally formatted broadcast signals due to their long physical dimensions, directional requirements, and sensitivity to environmental changes, leading to inadequate signal reception and interference issues.
Innovation Solution
A low-profile, omni-directional, multi-polarity planar antenna with microstrip elements on both sides of a dielectric substrate, featuring modified H-shaped patterns and supplemental regions for improved signal reception and impedance matching, allowing for both horizontal and vertical polarization and reduced sensitivity to environmental changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional VHF dipole antenna elements are used, then VHF signal reception is achieved, but the physical length becomes excessively long (4-6 feet) for indoor use
Solution Approach 1:
The patent transforms the conventional wire dipole elements into printed circuit board traces, changing the physical form and electrical characteristics. The microstrip transmission line structure on the PCB provides the necessary electrical length for VHF reception while maintaining a compact physical footprint, resolving the contradiction between reception capability and physical length.
Solution Approach 2:
The patent replaces the mechanical wire-based dipole structure with an etched conductive pattern on a dielectric substrate. This substitution allows the antenna to achieve the required electrical properties through controlled impedance traces rather than physical wire length, enabling compact indoor installation.
2Reliability
If conventional directional antennas are used, then signal reception is optimized in specific directions, but the antenna requires frequent adjustment and cannot provide omni-directional coverage
Solution Approach 1:
The patent creates an antenna that simultaneously provides omni-directional coverage for both VHF and UHF bands, as well as reception for both analog and digital formats. The symmetrical H-shaped microstrip pattern on the PCB enables the antenna to receive signals from all horizontal directions without requiring directional adjustment, making it universally applicable for indoor TV reception.
3Ease of manufacture
If simple planar antenna elements are used, then manufacturing is simple, but the antenna lacks sufficient signal level and reception performance
Solution Approach 1:
The patent divides the antenna into distinct functional regions on the PCB: H-shaped microstrip elements for VHF reception, loop structures for UHF reception, and supplemental regions for impedance matching and signal enhancement. This segmentation allows each region to be optimized for its specific function while maintaining overall manufacturing simplicity through standard PCB fabrication processes.
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 provides stable, omni-directional reception of both analog and digital signals, optimizing ATSC signal reception and minimizing channel drop-off and interference, ensuring consistent signal quality without the need for directional adjustments.
Implementation Method 1
A plurality of microstrip elements are formed on one side of a substrate... microstrip antenna elements are formed on the opposite side of the substrate
Implementation Method 2
The arrangement of the antenna elements on one side of the substrate is substantially the same as the arrangement of the elements situated on the other side of the substrate; however, the arrangement of the elements on the second side is oriented or offset ninety degrees from the arrangement of the elements on the first side of the substrate
Data Source
AI summary
An omni-directional, multi-polarity, low profile planar antenna for receiving high definition television signals includes a dielectric substrate having a first side and a second side on which are respectively formed first and second conductive patterns. Each conductive pattern includes segments functioning as antenna elements which are arranged to form a first modified H-shaped pattern on the first side of the dielectric substrate, and a second modified H-shaped pattern on the second side of the dielectric substrate which is disposed substantially ninety degrees with respect to the first modified H-shaped pattern. Each of the H-shaped patterns includes an extended S-shaped segment.