Antenna Device Capacitive Coupling Multi-Frequency Resonance
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Solution Overview
Problem
Existing antenna devices can only achieve resonance at up to two frequencies using two antenna elements by varying the electrical length of these elements, limiting their miniaturization potential.
Innovation Solution
An antenna device with a first and second antenna element, a power supply section, and a switching element that capacitively couples the elements during disconnection, allowing the first antenna element to operate as a ¼ or ½ wavelength antenna depending on connection status, thereby achieving at least three resonance frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two antenna elements are electrically connected and disconnected to change electrical length, then resonance at two frequencies is achieved, but the number of resonance frequencies is limited to at most two
Solution Approach 1:
The patent merges the functions of two antenna elements by introducing capacitive coupling between them. When the switching element disconnects the first antenna element from the power supply section, the first and second antenna elements become capacitively coupled, allowing them to function together as a combined antenna structure. This merging enables the system to achieve resonance at additional frequencies beyond what two independently controlled elements could provide, resolving the limitation of obtaining only two resonance frequencies.
Solution Approach 2:
The patent introduces dynamic switching between two distinct operational states: (1) the first antenna element connected to the power supply section, and (2) the first antenna element disconnected and capacitively coupled with the second antenna element. This dynamic reconfiguration allows the antenna device to switch between different resonance frequency sets, achieving adaptability for at least three different resonance frequencies while maintaining a fixed physical structure.
2Adaptability or versatility
If additional antenna elements and transmitting/receiving circuits are provided for different frequencies, then resonance at multiple frequencies is achieved, but the antenna device becomes larger
Solution Approach 1:
The patent makes the two antenna elements universal by enabling them to serve multiple functions through different connection configurations. The same two antenna elements can operate independently or in combination via capacitive coupling, allowing the system to achieve resonance at at least three different frequencies without requiring additional antenna elements. This multi-functionality resolves the contradiction by providing frequency versatility while maintaining a compact size.
Solution Approach 2:
The patent introduces capacitive coupling as an intermediary mechanism between the two antenna elements. This capacitive coupling acts as a mediator that enables energy transfer and interaction between the elements when directly connected, allowing the system to achieve additional resonance frequencies without requiring direct electrical connection or additional circuitry. The capacitive coupling intermediary enables frequency multiplication while keeping the device compact.
3Volume of moving object
If two antenna elements are used with electrical connection switching, then circuit miniaturization is achieved, but only at most two resonance frequencies can be obtained
Solution Approach 1:
The patent changes the operational parameters of the antenna elements by introducing capacitive coupling as an additional degree of freedom. Instead of merely switching electrical connections, the system now可以利用 capacitive coupling to alter the effective electrical length and impedance characteristics of the antenna elements. This parameter change enables the same compact two-element structure to resonate at at least three different frequencies, resolving the contradiction between miniaturization and frequency versatility.
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 the antenna device to operate at multiple resonance frequencies using only two antenna elements, facilitating miniaturization and efficient frequency switching.
Implementation Method 1
a switching element for electrically connecting and disconnecting the first antenna element and the power supply section with/from each other
Implementation Method 2
the first antenna element and the second antenna element being provided so as to be capacitively coupled to each other during the electrical disconnection between the first antenna element and the power supply section
Implementation Method 3
each of the first antenna element and the second antenna element operates as a 1/4 wavelength antenna at a corresponding specified resonance frequency
Data Source
AI summary
At least three resonance frequencies are obtained by two antenna elements. The antenna device includes antenna elements (11) and (12), a wireless section (20) for supplying power to each of the antenna elements (11) and (12), a PIN diode (16) for electrically connecting and disconnecting the antenna element (11) and the wireless section (20) with/from each other, the antenna elements (11) and (12) being provided so as to be capacitively coupled to each other during the electrical disconnection between the antenna element (11) and the wireless section (20) which electrical disconnection is made by the PIN diode (16).