Tunable Antenna Circuit for Slim Electronic Devices
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Solution Overview
Problem
Slim electronic devices face challenges in accommodating multiple antennas for various frequency bands due to limited space, which complicates meeting operator specifications and minimizing human influence while maintaining radiation performance.
Innovation Solution
Incorporating a tunable circuit with a low-resistance circuit connected in parallel to the antenna structure, featuring a resistor and inductor, to facilitate easy frequency shifting without degrading performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a tunable IC with FET module is used for frequency shift, then frequency shifting capability is achieved, but parasitic capacitance increases making frequency shift difficult
Solution Approach 1:
The patent changes the electrical parameters of the antenna system by introducing a tunable circuit that adjusts capacitance values. The tunable IC modifies the resonant frequency of the antenna by changing the capacitance parameter, enabling frequency shifting from a first frequency band to a second frequency band while managing the parasitic capacitance effect through controlled parameter adjustment.
Solution Approach 2:
The patent introduces a matching circuit as an intermediary component between the antenna and the tunable IC. This matching circuit includes inductors and capacitors that mediate the interaction between the antenna structure and the tunable elements, optimizing the frequency shift process and reducing the negative impact of parasitic capacitance in the FET module.
2Ease of operation
If element with low internal resistance is used in tunable IC, then frequency shift becomes easier, but parasitic capacitance increases
Solution Approach 1:
The patent carefully selects and adjusts the resistance parameter of the elements in the tunable IC. By optimizing the internal resistance value of the FET module, the patent achieves a balance between ease of frequency shifting and maintaining adequate frequency band coverage, preventing excessive parasitic capacitance while enabling smooth frequency transitions.
Solution Approach 2:
The patent applies different quality characteristics to different parts of the tunable circuit. The FET module uses elements with specific resistance values optimized for local frequency shifting operations, while the overall antenna system maintains properties suitable for broad frequency band coverage through the matching circuit design.
3Adaptability or versatility
If tunable IC with particular internal resistance is used, then parasitic capacitance is controlled, but antenna gain is reduced
Solution Approach 1:
The matching circuit acts as an intermediary that compensates for the gain reduction caused by the tunable IC. The inductors and capacitors in the matching circuit are designed to optimize the impedance matching and minimize losses, thereby recovering antenna gain that would otherwise be reduced by the presence of the tunable IC with controlled internal resistance.
Solution Approach 2:
The patent optimizes the electrical parameters of the matching circuit components to compensate for the gain loss. By adjusting the inductance and capacitance values in the matching circuit, the system recovers antenna performance while maintaining the frequency shifting capability provided by the tunable IC with controlled internal resistance.
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 configuration enhances antenna gain and radiation performance by lowering the total resistance value, allowing for efficient frequency shifting across different bands.
Implementation Method 1
the inductor having a constant inductance value and disposed between the resistor and the ground
Data Source
Figure 1
Figure 2a~2b
Figure 3
AI summary
In an embodiment, an electronic device may include a housing having an inner space, a first printed circuit board including a wireless communication circuit, an antenna structure connected to the wireless communication circuit through a first electrical path, and a tunable circuit having a first resistance value and disposed on a second electrical path. The electronic device may further include a low-resistance circuit disposed on a third electrical path branched from the second electrical path, and including a resistor and an inductor, the resistor having a second resistance value determined based on the first resistance value, and the inductor having a constant inductance value and disposed between the resistor and the ground. The electronic device may also include at least one processor configured to control the tunable circuit.