Tapered Loop Antenna Assemblies for HDTV Signal Reception
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Solution Overview
Problem
Existing antenna assemblies for receiving high definition television (HDTV) signals face challenges in achieving optimal gain, impedance bandwidth, and physical size, with traditional designs often compromising on one or more of these factors, and there is a need for an efficient and compact solution that can operate across the UHF and VHF frequency ranges without performance degradation.
Innovation Solution
The antenna assembly incorporates a tapered loop antenna element with a reflector and a printed circuit board balun, optimized in size and spacing to achieve enhanced impedance bandwidth and gain, featuring a rotatable support for versatile mounting and a compact design that includes a mesh reflector for outdoor applications, and an integrated UHF balun diplexer for efficient signal combination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If traditional antenna designs are used, then the antenna can achieve adequate gain, but the physical size becomes large and impedance bandwidth is limited
Solution Approach 1:
The patent applies parameter changes by modifying the geometric dimensions and configuration of the antenna elements. Specifically, the loop antenna element dimensions are optimized to resonate at UHF frequencies while maintaining a compact form factor. The spacing between elements and the reflector geometry are adjusted to achieve broadband impedance matching across both UHF and VHF ranges, resolving the contradiction between small size and adequate performance.
Solution Approach 2:
The patent employs composite structural design by combining different antenna element types (loop elements, dipole elements, and reflector) into a single integrated assembly. This composite structure enables the antenna to operate across multiple frequency bands (UHF and VHF) simultaneously, achieving broadband performance in a compact configuration that would be impossible with single-element traditional designs.
2Volume of moving object
If antenna size is reduced for compact installation, then the footprint is minimized, but gain and signal reception quality deteriorate
Solution Approach 1:
The patent transitions from planar two-dimensional antenna configurations to three-dimensional spatial arrangements. The loop antenna elements are positioned in specific three-dimensional orientations with controlled spacing from the reflector and each other. This dimensional transition allows the compact antenna to achieve high gain by exploiting spatial diversity and three-dimensional radiation patterns, overcoming the gain loss typically associated with size reduction.
Solution Approach 2:
The patent implements a nested configuration where the loop antenna elements are positioned within the spatial envelope defined by the reflector structure. This nesting arrangement maximizes the effective aperture and radiation efficiency within the compact overall footprint, achieving high gain performance without requiring large external dimensions. The elements are strategically placed to utilize the available three-dimensional space efficiently.
3Adaptability or versatility
If single-frequency antenna elements are used, then the design is simple, but the antenna cannot operate across both UHF and VHF frequency ranges
Solution Approach 1:
The patent achieves multi-functionality by designing the antenna assembly to simultaneously perform UHF and VHF signal reception. The loop antenna elements are dimensioned and positioned to resonate at UHF frequencies, while the overall assembly geometry and element spacing enable VHF operation as well. This universal design allows a single antenna structure to replace what would traditionally require separate antennas for different frequency bands, managing complexity through integrated multi-band functionality.
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 provides a compact, efficient, and high-gain antenna assembly that maintains consistent performance across the UHF and VHF frequency ranges, offering improved impedance matching and reduced signal loss, with a peak gain of 10.4 dBi at 670 MHz and 3.1 dBi at 216 MHz, while maintaining a small footprint and efficient operation indoors, outdoors, or in attics.
Implementation Method 1
antenna assemblies configured for reception of television signals
Implementation Method 2
a reflector and a printed circuit board balun, optimized in size and spacing
Data Source
AI summary
According to various aspects, exemplary embodiments are provided of antenna assemblies. In an exemplary embodiment, an antenna assembly generally includes at least one antenna element configured to be operable for receiving high definition television signals.