Non-Resonant Antenna for Compact Wireless Devices
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Solution Overview
Problem
Existing wireless devices face challenges in incorporating internal antennas that can efficiently cover broad bandwidths required for digital TV services like DVB-H, while maintaining a compact size and adequate gain, as traditional antennas are either too large or suffer from reduced efficiency when miniaturized.
Innovation Solution
The use of non-resonant antenna elements with constant input impedance across a wide frequency band, combined with a matching network and parasitic antenna elements, allows for efficient signal reception and processing over a large bandwidth without the need for external antennas, even in compact devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If traditional resonant antennas are used for digital TV services, then adequate gain can be achieved, but the antenna size becomes too large for compact handheld devices
Solution Approach 1:
The patent changes the fundamental operating parameter of the antenna from resonant to non-resonant operation. This allows the antenna to achieve adequate gain across a broad frequency band (470-770 MHz) without requiring the physical length to be proportional to the wavelength, thus enabling compact handheld device integration while maintaining reception performance
Solution Approach 2:
The patent employs a tunable matching network that dynamically adjusts the antenna's input impedance to maintain optimal performance across the broad frequency band. This dynamic adjustment compensates for the non-resonant operation, allowing the antenna to adapt to different frequency conditions without requiring physical size changes
2Adaptability or versatility
If antenna size is reduced for compact devices, then device portability is improved, but bandwidth and gain performance deteriorate
Solution Approach 1:
The patent transitions from resonant antenna operation to non-resonant operation with active impedance matching, enabling the antenna to achieve broad bandwidth coverage (470-770 MHz) while maintaining a compact volume suitable for handheld devices. The matching network dynamically adjusts parameters to maintain performance across the entire frequency band
Solution Approach 2:
The antenna system is designed to universally cover the entire DVB-H frequency band (470-770 MHz) with a single compact antenna element, rather than requiring multiple resonant antennas for different frequency ranges. The tunable matching network provides multi-functional capability to maintain performance across the broad spectrum
3Power
If resonant frequency tuning is used for specific bands, then gain at centre frequency is improved, but bandwidth coverage is reduced
Solution Approach 1:
The patent employs a tunable matching network that dynamically adjusts the antenna's input impedance across the broad frequency band. This dynamic parameter adjustment maintains adequate signal gain (>-10 dB) across the entire DVB-H spectrum (470-770 MHz) without requiring the antenna to be resonant at any specific frequency, thus achieving both power efficiency and broad adaptability
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
This solution enables wireless devices to achieve the necessary gain and bandwidth for digital TV services within a compact form factor, improving signal reception and reducing the size and weight of handheld devices while maintaining performance.
Implementation Method 1
the signal transmitted by the transmitter is captured by one or more antennas at the receiver end, and converted into an electrical signal
Data Source
AI summary
The invention relates, inter alia, to a wireless portable device for radio communication, comprising at least one antenna element (1210), at least one ground-plane (1250), radio frequency communication circuitry (1310) and at least one matching network (1320). The device is arranged for communication involving, at least, receiving and processing a signal in accordance with a communication system having a bandwidth with a lower frequency limit (fmin) and an upper frequency limit (fmax). The antenna element is a non-resonant antenna element for frequencies from said lower frequency limit (fmin) up to said higher frequency limit (fmin). Another aspect of the invention involves two antenna elements (2001, 2002) tuned around two different central frequencies within a frequency band, and a switch (2003) for selectively operatively connecting one of said at least two antenna elements to a radio frequency communication circuitry (2000).