Rotatable Diversity Dipole Antenna for Indoor TV Reception
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Solution Overview
Problem
Current digital terrestrial television signal reception systems for portable devices face challenges such as fading due to multiple paths and signal attenuation when used indoors, which existing antennas fail to adequately address.
Innovation Solution
A diversity antenna system comprising at least two dipole-type antennas with rotatable second arms, each forming a complementary profile to a common first arm, which can be folded for compactness and optimized for improved signal reception by adjusting their orientation relative to the first arm, enhancing impedance matching and isolation across the UHF band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single dipole antenna is used for portable digital television reception, then the device remains compact and simple, but signal reception quality deteriorates due to fading and multiple path interference
Solution Approach 1:
The patent combines two dipole antennas into a single integrated structure where the first arms are merged into a common conductive element forming part of the electronic card housing, while the second arms remain as separate rotatable elements. This merging approach improves signal reception quality through diversity gain while controlling device complexity by sharing common structural components.
Solution Approach 2:
The antenna system is segmented into two functional parts: common first arms that form the housing structure and separate second arms that can be independently positioned. This segmentation allows each antenna element to be optimized for specific reception scenarios while maintaining overall system compactness through the shared first arm structure.
2Reliability
If the antenna structure is made compact for portable devices, then portability is improved, but signal reception performance deteriorates due to reduced antenna size and positioning flexibility
Solution Approach 1:
The antenna system employs a nested configuration where the second arms can be folded back onto or alongside the first arms when not in use. This nesting approach allows the antenna to achieve a compact form factor for portability while maintaining full extension capability for optimal signal reception performance when needed.
Solution Approach 2:
The antenna system incorporates rotatable joints that allow the second arms to dynamically adjust their position relative to the first arms. This dynamic capability enables the antenna to transition between compact stored positions and extended reception positions, balancing portability requirements with signal reception performance.
3Reliability
If diversity antenna system is implemented to overcome fading phenomena, then reception robustness is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent merges the housing structure with the antenna support structure by making the first arms form the electronic card housing. This integration eliminates the need for separate mounting structures and simplifies manufacturing while maintaining the diversity antenna configuration for improved reception robustness.
Solution Approach 2:
The first arms serve multiple functions: they form the structural housing of the electronic card, provide support for the second arms, and act as active antenna elements. This multi-functionality reduces the number of separate components needed, simplifying manufacturing while maintaining reception robustness through the diversity configuration.
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 system achieves greater than 50% efficiency and 3 dBi directivity over the UHF band, providing robust signal reception and improved diversity gain by maintaining perpendicular arm positions, thus overcoming indoor signal attenuation and fading issues.
Implementation Method 1
System of diversity dipole antennas for the reception of television signals, notably the reception of digital signals
Data Source
AI summary
The present invention relates to a diversity antennas system comprising at least two antennas of the dipole type each formed by a first and a second conductive arm, supplied differentially wherein the two antennas comprise a common arm called first arm forming at least one cover for an electronic card and each one a second arm mounted in rotation at one extremity of the first arm.