Adjustable Antenna with Diode-Based Control Circuit for Frequency Tuning
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Solution Overview
Problem
Portable communication devices face challenges in designing compact, multi-frequency antennas due to limited space and the need for multiple frequency bands, with traditional adjustable antennas requiring extra wirings for control signals, leading to increased complexity and signal noise.
Innovation Solution
An adjustable antenna with an adjusting element comprising two diodes with opposite conductive directions, controlled by direct-current biased signals through a feeding terminal and ground terminal, allowing for smooth and continuous frequency adjustment without additional wirings, and incorporating variable capacitive loading for precise frequency tuning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional adjustable antennas use extra wirings to transmit control signals for frequency adjustment, then frequency adjustability is improved, but device complexity increases and signal noise increases
Solution Approach 1:
The patent combines the control signal transmission path with the existing feeding terminal and ground terminal of the antenna. The bias control signal is transmitted through the feeding terminal to the adjusting element, eliminating the need for separate control wirings. This merging approach reduces structural complexity while maintaining frequency adjustability.
Solution Approach 2:
The feeding terminal and ground terminal serve dual functions: they provide both the RF signal transmission and the bias control signal transmission to the adjusting element. This multi-functionality reduces the number of required terminals and wirings, simplifying the overall antenna structure.
2Adaptability or versatility
If multiple antennas or antenna transceiver terminals are used to cover different frequency bands, then frequency coverage is improved, but device space consumption increases
Solution Approach 1:
The patent employs an adjustable antenna with an adjusting element that can dynamically change its electrical characteristics. By varying the bias control signal, the antenna's resonant frequency and impedance can be tuned to operate across multiple frequency bands, replacing the need for multiple fixed-frequency antennas.
Solution Approach 2:
The adjusting element modifies the antenna's electrical parameters (such as capacitance or inductance) by changing its conducting state in response to bias control signals. This parameter change enables the same antenna structure to resonate at different frequencies, achieving multi-band coverage without additional antenna elements.
3Ease of manufacture
If fixed characteristic antennas are used for specific bands, then manufacturing simplicity is improved, but adaptability to different frequency bands deteriorates
Solution Approach 1:
The adjusting element is pre-configured in the antenna structure during manufacturing, but its specific operating state is determined later by applying appropriate bias control signals. This preliminary setup maintains manufacturing simplicity while enabling post-manufacturing adaptability to different frequency bands through electronic control.
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 dynamic frequency adjustment across a wide range of bands without extra control signal wirings, maintaining optimal performance and reducing signal noise, thus addressing the complexity and space constraints of compact communication devices.
Implementation Method 1
The first diode and the second diode have opposite conducting directions. A first control signal and a second control signal are fed respectively through the feeding terminal and the ground terminal to the adjustable antenna for controlling conducting states of the first diode and the second diode
Implementation Method 2
the adjustable antenna may further include a variable capacitive loading, and a capacitance value of the variable capacitive loading can be controlled by a direct-current (DC) biased control signal fed through the feeding terminal, such that the frequency adjustment can be controlled in a smooth and continuous manner
Data Source
AI summary
A portable communication device and an adjustable antenna thereof are disclosed herein. The portable communication device includes a substrate, the adjustable antenna and a control circuit. The adjustable antenna includes an antenna body, an adjusting element, a feeding terminal and a ground terminal. The antenna body has multiple conductive portions and is disposed above the substrate. The adjusting element is coupled between the conductive portions. The feeding terminal and the ground terminal extend from the antenna body and are coupled to the substrate. The control circuit feeds a first control signal and a second control signal respectively through the feeding terminal and the ground terminal to the adjusting element, so as to adjust an electrical length of the adjustable antenna.