Miniaturized Digital TV Antenna with Switchable Bandwidths
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Solution Overview
Problem
Conventional digital TV antennas are too large to be built into portable digital televisions, limiting their convenience for use outside the home, as they require external connection and are not compact enough for integration.
Innovation Solution
A miniaturized digital TV antenna with switchable multiple bandwidths, comprising a substrate with a grounding metallic surface and a microstrip line, an antenna unit made of high dielectric constant materials, and a switch unit that allows frequency tuning to achieve wide bandwidth reception, enabling a small antenna to operate across various frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the dimension of the digital TV antenna is made larger to increase the frequency bandwidth reception range, then the bandwidth reception capability is improved, but the portability and ease of carrying deteriorates
Solution Approach 1:
The antenna is divided into multiple independent antenna units, each designed to receive specific frequency bands. The switch unit selectively connects different antenna units based on the required frequency band, enabling a compact antenna structure to achieve wide bandwidth reception capability by segmenting the reception function across multiple small units rather than requiring one large antenna.
Solution Approach 2:
The antenna system incorporates a switch unit that dynamically connects different antenna units to different leads based on the frequency band being used. This dynamic switching capability allows the compact antenna structure to adapt its effective configuration for different frequency bands, achieving wide bandwidth reception without requiring a large fixed-size antenna.
2Ease of operation
If the antenna is made compact for portable digital television, then the portability is improved, but the bandwidth reception capability deteriorates
Solution Approach 1:
The antenna system achieves multi-functionality by incorporating multiple antenna units that can be selectively activated. Each antenna unit is designed for specific frequency bands, and the switch unit enables any unit to be connected based on reception needs. This universal design allows a single compact antenna structure to perform the function of multiple larger antennas across different frequency bands.
Solution Approach 2:
The system changes the electrical parameters (effective length, impedance, resonant frequency) by switching between different antenna units rather than physically changing the antenna structure. This allows the compact antenna to achieve different electrical characteristics suitable for different frequency bands through parameter switching rather than physical transformation.
3Adaptability or versatility
If multiple antenna units are integrated with a switch unit to achieve wide bandwidth reception, then the frequency adaptability is improved, but the device complexity increases
Solution Approach 1:
The patent merges multiple antenna units and the switch unit into a single integrated antenna assembly. The switch unit is positioned between the leads and antenna units, creating a unified structure where the control circuit can selectively connect different antenna units to different leads. This merging approach manages the complexity by integrating components into a cohesive unit rather than separate elements.
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
Enables a compact, built-in digital TV antenna in portable devices to receive a wide range of digital TV signals, enhancing user convenience by allowing portable digital television operation without the need for external antennas.
Implementation Method 1
The antenna unit is made into an elongated cubic carrier by materials having a high dielectric constant (K>4)
Implementation Method 2
Since the wavelength and the frequency of the electromagnetic wave are reversely proportional to each other, the same one antenna can be separated into a plurality of frequency bands
Data Source
AI summary
An extremely miniaturized digital TV signal reception antenna built in a mobile device includes a substrate, an antenna unit and a switch unit. The substrate is provided with a plate having a grounding metallic surface and a first clearance surface. A second clearance surface is provided on the same side of the grounding metallic surface with a metallic microstrip line for electrically connecting to an output end of the switch unit. Input ends of the switch unit are electrically connected with a plurality of leads of the first clearance surface. The other ends of the plurality of leads are electrically connected with the antenna unit. Finally, when a tuner of a portable digital television switches the channels, signals of the switched channel are simultaneously output to the switch unit. According to the frequency of that channel, the switch unit automatically switches to a suitable range of bandwidth for receiving the digital TV signals, thereby performing the reception of the digital TV signals.