Antenna Arrangement with Dynamic Resonant Frequency Tuning
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Solution Overview
Problem
Existing small antennas face a trade-off between power loss and bandwidth, unable to achieve a high quality factor Q beyond the Chu limit, which restricts their ability to efficiently transmit electromagnetic signals with low power loss and wide bandwidth.
Innovation Solution
A device using a combination of three antennas with synchronous frequency switching and dynamic adaptation of resonant frequency, performed by adding or removing capacitors in parallel with inductance and resistance, allows for amplitude modulation of signals with zero crossing voltage control, enabling high quality factor Q and reduced power loss during modulation state transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If small antennas are used for transmission, then the device size is reduced, but the bandwidth decreases and power loss increases due to the Chu limit
Solution Approach 1:
The patent applies dynamics by making the antenna system adjustable through variable capacitors that can change the resonant frequency dynamically. This allows the antenna to adapt its electrical characteristics to maintain optimal performance across different operating conditions, resolving the contradiction between small physical size and acceptable power loss by enabling frequency tuning that compensates for the inherent limitations of electrically small antennas
Solution Approach 2:
The patent changes the electrical parameters of the antenna system by introducing variable capacitance elements that can alter the resonant frequency and impedance characteristics. This parameter adjustment allows the small antenna to achieve better impedance matching and reduce power loss, effectively overcoming the Chu limit constraints through dynamic parameter optimization
2Volume of moving object
If small antennas are used for transmission, then the device size is reduced, but the bandwidth is limited by the quality factor Q
Solution Approach 1:
The patent employs dynamics by implementing a tunable resonant frequency mechanism through variable capacitors. This allows the antenna system to dynamically adjust its resonant frequency to match different signal frequencies, thereby extending the effective bandwidth beyond what a fixed small antenna could achieve, while maintaining a compact physical size
Solution Approach 2:
The patent achieves bandwidth expansion by changing the electrical parameters of the antenna system through variable capacitance. This parameter modification enables the antenna to operate effectively across a wider frequency range, overcoming the inherent bandwidth limitation imposed by the high quality factor Q of electrically small antennas
3Loss of information
If frequency switching is performed for amplitude modulation, then data transmission capability is improved, but transient responses occur during modulation state transitions
Solution Approach 1:
The patent applies preliminary action by pre-adjusting the resonant frequency of the antenna to match the incoming signal frequency before modulation occurs. This anticipatory frequency alignment ensures that the antenna is already in optimal resonance when modulation state transitions happen, preventing transient responses and maintaining reliable data transmission without information loss
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 approach enables efficient transmission of signals with a high quality factor Q and bandwidth beyond the Chu limit, reducing power losses and avoiding transient responses during modulation, thereby enhancing spectral efficiency.
Implementation Method 1
transmitting antennas must be able to radiate or radiate one or more electrical signals with a minimum of losses
Implementation Method 2
the adaptation of the resonant frequency of at least one antenna arrangement can be carried out by adding or removing a complementary capacitor in parallel with a capacitor linked in series with an inductance and a resistance of loss
Data Source
Figure 1
Figure 2
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AI summary
The data signal transmission device (1) comprises a first signal generator (3) connected to a first antenna arrangement (6), a second signal generator (4) connected to a second antenna arrangement (7), a third signal generator (5) connected to a third antenna arrangement (8), and a synchronization circuit (2). The synchronization circuit performs amplitude modulation of the data by combining the signals transmitted by the antenna arrangements. The signals transmitted by the first and third antenna arrangements are in phase in a first stable modulation state and 180° out of phase in a second stable modulation state. During a modulation state transition phase, the frequencies of the first and third signals provided by the first and third generators are at a different frequency than the carrier frequency of the signals provided by the second generator.The resonant frequency of the first and third antenna arrangements is also adapted in the transition phase.