Tapered Loop Antenna Assemblies for Broadband HDTV Reception
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Solution Overview
Problem
Existing antenna designs for receiving high definition television (HDTV) signals are not optimized for broadband applications, often compromising between gain, impedance bandwidth, and physical size, and lack efficient methods to combine VHF and UHF signals without significant signal loss due to impedance mismatches and phase cancellation.
Innovation Solution
The development of antenna assemblies featuring tapered loop antenna elements with offset diameters and integrated reflectors, along with a printed circuit board balun, which are configured to enhance impedance bandwidth and directivity while allowing for efficient reception of HDTV signals across a broad frequency range, and the inclusion of a UHF balun diplexer to combine VHF and UHF signals without performance degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional antenna designs are used for HDTV signals, then the antenna can receive television signals, but the antenna compromises between gain, impedance bandwidth, and physical size without optimization
Solution Approach 1:
The patent applies parameter changes by modifying the geometric parameters of the antenna elements, specifically using tapered loop elements with varying width along their perimeter. This tapering parameter change enables the antenna to achieve broader impedance bandwidth while maintaining a compact physical footprint, resolving the contradiction between bandwidth adaptability and size constraints
Solution Approach 2:
The patent employs dimensionality change by transitioning from traditional planar antenna elements to three-dimensional tapered loop structures with offset diameters. This spatial dimensionality enhancement allows the antenna to achieve superior impedance bandwidth performance within a reduced physical volume by utilizing spatial configuration rather than simply scaling up element size
2Adaptability or versatility
If VHF and UHF signals are combined in traditional antennas, then both signal types can be received, but signal loss occurs due to impedance mismatches and phase cancellation
Solution Approach 1:
The patent applies segmentation by dividing the antenna system into distinct VHF and UHF signal paths with separate feeding mechanisms. This segmentation prevents impedance mismatches and phase cancellation between bands by treating each frequency range independently, allowing both VHF and UHF signals to be received without energy loss while maintaining adaptability across multiple bands
Solution Approach 2:
The patent introduces an intermediary feeding structure that acts as a mediator between the transmission line and the dual-band antenna elements. This intermediary design provides impedance transformation and phase compensation, enabling efficient coupling of both VHF and UHF signals to the receiver without the signal loss that would result from direct coupling in traditional designs
3Volume of moving object
If antenna size is reduced for compact applications, then portability and indoor use are improved, but gain and signal reception performance deteriorate
Solution Approach 1:
The patent applies parameter changes by optimizing the dimensional parameters of the tapered loop elements, specifically controlling the taper ratio and offset diameter within precise ranges. These parameter optimizations enable the antenna to achieve high signal gain within a compact volume by maximizing the electromagnetic efficiency of each unit of physical space
Solution Approach 2:
The patent employs composite structural design by combining conductive antenna elements with dielectric supporting structures in an integrated assembly. This composite approach allows the antenna to achieve high gain performance in a compact form factor by utilizing the complementary properties of different materials to enhance electromagnetic radiation efficiency within constrained physical dimensions
Data Source
AI summary
According to various aspects, exemplary embodiments are provided of antenna assemblies. In an exemplary embodiment, an antenna assembly generally includes one or more tapered loop antenna elements.