Multiband Slot Antenna Layout for Resonant Frequency Downsizing
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Solution Overview
Problem
Existing multiband antennas are not effectively downsized while maintaining multiple resonant frequencies, as the addition of radiation elements can lower the resonant frequency of the slot antenna, leading to increased size and complexity.
Innovation Solution
A multiband antenna design incorporating a conductive main portion with a slot and open portion, a radiation element, and an additional element that extends without contact to adjust impedance, allowing for downsizing by adjusting the resonant frequency of the slot antenna.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a radiation element is added to lower the resonant frequency of the slot antenna, then the resonant frequency can be adjusted, but the antenna size increases
Solution Approach 1:
An additional conductive element is introduced as an intermediary between the slot antenna and the radiation element. This additional element adjusts the impedance of the slot antenna through capacitive coupling, thereby lowering the resonant frequency without requiring the radiation element to be physically connected, thus avoiding the size increase that would result from direct integration
Solution Approach 2:
The resonant frequency is adjusted by changing the impedance parameter of the slot antenna through the additional element. By modifying the electrical parameters (impedance) rather than the physical dimensions, the resonant frequency is lowered without proportionally increasing the antenna size
2Adaptability or versatility
If the antenna structure is made more complex to achieve multiband operation, then multiple resonant frequencies can be achieved, but the device complexity increases
Solution Approach 1:
The additional element serves multiple functions simultaneously: it adjusts the impedance of the slot antenna, lowers the resonant frequency, and enables multiband operation. This multi-functional approach achieves versatility without proportionally increasing structural complexity
Solution Approach 2:
The additional conductive element acts as a mediator that simplifies the overall structure by providing a single component that achieves multiple objectives (impedance adjustment, frequency lowering, and multiband capability) rather than requiring multiple separate elements or complex configurations
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
The additional element adjusts impedance, enabling the multiband antenna to be downsized without compromising its resonant frequency performance, thereby optimizing size and functionality.
Implementation Method 1
the additional element adjusts an impedance of the multiband antenna, and thereby a resonant frequency of the slot antenna can be lowered
Implementation Method 2
The multiband antenna has two resonant frequencies or operating frequencies, namely, a resonant frequency of the slot antenna 92 and a resonant frequency of the radiation element 94
Data Source
AI summary
First and second slot edge portions of a conductive main portion are long in a first direction and sandwich a slot in a second direction. An open portion is formed a part different from the first slot edge portion and opens the slot outside the conductive main portion. A first part of a radiation element extends from an end portion of the first slot edge portion in the second direction. A second part of the radiation element extends from an end portion of the first part in the first direction. An additional element extends from the second part toward a second specific area through a first specific area. In a third direction, the first specific area and the second specific area overlap with the first slot edge portion and the second slot edge portion, respectively.