Parasitically Coupled HDTV Antenna Assembly Without Diplexer
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Solution Overview
Problem
Existing antenna assemblies for receiving high definition television (HDTV) signals require diplexers and VHF baluns, which increase complexity and size, and do not efficiently cover the entire VHF and UHF frequency bands without additional components.
Innovation Solution
The antenna assembly integrates a VHF antenna element parasitically coupled with a UHF antenna element without a direct ohmic connection, using a 75:300 ohm balun and adjustable coupling to cover VHF and UHF frequencies, eliminating the need for a diplexer and VHF balun, and allowing for compact design and efficient signal reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If diplexers and VHF baluns are used in antenna assemblies, then signal reception capability is improved, but device complexity and size increase
Solution Approach 1:
The patent combines VHF and UHF antenna elements into a single integrated assembly with shared support structures and common mounting hardware. The VHF antenna element and UHF antenna element are positioned to operate simultaneously without requiring separate diplexers or baluns, merging multiple functions into one unified structure that reduces overall complexity while maintaining reception capability across both frequency bands
Solution Approach 2:
The antenna assembly is designed to perform multiple functions simultaneously - receiving both VHF and UHF television signals through a single integrated structure. The shared support structure and common mounting system enable the assembly to serve dual frequency bands without requiring separate specialized components for each band, achieving multi-functionality that reduces device complexity
2Reliability
If diplexers and VHF baluns are used in antenna assemblies, then signal reception capability is improved, but the size of the antenna assembly increases
Solution Approach 1:
The patent merges VHF and UHF antenna elements into a compact integrated assembly where both elements share common support structures, mounting brackets, and housing. This consolidation eliminates the need for separate diplexers and baluns that would increase volume, achieving efficient space utilization while maintaining reception capability across both frequency bands
Solution Approach 2:
The antenna elements are arranged in a nested configuration where the VHF antenna element is positioned in front of the UHF antenna element, both sharing the same support structure and mounting point. This nested arrangement allows both frequency bands to be received within a compact footprint, minimizing the overall volume of the antenna assembly while maintaining dual-band reception capability
3Adaptability or versatility
If additional components are used to cover entire VHF and UHF frequency bands, then frequency coverage is improved, but device complexity increases
Solution Approach 1:
The integrated antenna assembly is designed to universally receive both VHF and UHF television signals through a single structure. The VHF antenna element covers VHF frequencies while the UHF antenna element covers UHF frequencies, and both elements are incorporated into one assembly that requires no additional diplexers or baluns, achieving broad frequency coverage without increasing device complexity
Solution Approach 2:
The patent merges multiple frequency band reception capabilities into a single antenna assembly. By positioning the VHF and UHF antenna elements to operate simultaneously with shared support structures, the design achieves comprehensive frequency coverage across both VHF and UHF bands without requiring additional separate components, thereby maintaining simplicity while expanding versatility
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 solution enables efficient reception of HDTV signals across the entire VHF and UHF frequency bands with improved bandwidth and gain, reducing the size and complexity of the antenna assembly while maintaining good voltage standing wave ratio (VSWR) and directivity.
Implementation Method 1
The VHF antenna element and the UHF antenna element may be parasitically coupled without a direct ohmic connection between the VHF antenna element and the UHF antenna element
Data Source
AI summary
Exemplary embodiments are disclosed of antenna assemblies configured for reception of television signals, such as high definition television (HDTV) signals. In an exemplary embodiment, an antenna assembly generally includes a VHF antenna element and a UHF antenna element. The VHF antenna element and the UHF antenna element may be parasitically coupled without a direct ohmic connection between the VHF antenna element and the UHF antenna element. The antenna assembly may be configured to be operable for receiving VHF and UHF high definition television signals without using a diplexer and a VHF balun.