Coupling Feed Antenna for Multi-Band Miniaturization
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Solution Overview
Problem
Existing antenna designs face challenges in achieving miniaturization and multiple frequency bands while maintaining a compact size, with direct feed designs resulting in narrow communication frequency bands and coupling feed modes leading to complex structures and large volumes.
Innovation Solution
The antenna device employs a coupling feed mode with a coupling portion that adjusts impedance without acting as a radiation portion, using a ceramic or plastic carrier with patterned conductive layers to achieve wider bandwidths and reduced size, where the first and second radiation portions determine resonance points and the coupling portion is designed to be short to facilitate energy transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a direct feed mode is used with multiple metal radiation portions, then multiple frequency bands can be realized, but the antenna size is limited and bandwidth is narrow
Solution Approach 1:
The antenna is divided into separate functional portions: a coupling portion for impedance matching and energy transfer, and distinct first and second radiation portions for different frequency bands. This segmentation allows each portion to be optimized independently, enabling multi-frequency operation without proportionally increasing overall antenna volume.
Solution Approach 2:
A coupling portion is introduced as an intermediary element between the feed and radiation portions. This coupling portion serves as a mediator that transfers energy to the radiation portions while providing impedance matching, thereby widening bandwidth and enabling multi-frequency operation without directly increasing the radiating element size.
2Reliability
If the coupling portion length is increased to improve impedance matching, then bandwidth widens, but the coupling portion starts to act as a radiation portion affecting other impedances
Solution Approach 1:
The length of the coupling portion is precisely controlled to be less than one fourth of the wavelength at the operating frequency. This parameter constraint ensures the coupling portion functions solely for impedance matching and energy transfer without becoming a radiating element, thereby maintaining simple structure while achieving reliable impedance matching.
3Adaptability or versatility
If more radiation portions are added to widen communication frequency band, then bandwidth increases, but antenna structure complexity increases
Solution Approach 1:
The coupling portion is designed to serve multiple functions simultaneously: impedance matching, energy transfer to multiple radiation portions, and bandwidth widening. By making this single element multi-functional, the need for additional separate components is reduced, thereby widening the communication frequency band without proportionally increasing structural complexity.
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 design achieves a wider bandwidth without increasing the antenna's size, simplifying the design and reducing complexity by allowing impedance adjustment and resonance point control, thereby meeting the requirements of super-thin, multi-frequency band applications.
Implementation Method 1
The coupling portion capacitively couples an electrical signal to the first radiation portion and the second radiation portion
Data Source
AI summary
An antenna device comprises a carrier, a first radiation portion, a second radiation portion and a coupling portion. The first radiation portion, the second radiation portion and the coupling portion are provided on the carrier. The second radiation portion electrically connects with the first radiation portion. The first radiation portion and the second radiation portion share a shared part, the shared part is directly connected to a reference grounding. The coupling portion capacitively couples an electrical signal to the first radiation portion and the second radiation portion. The first radiation portion and the second radiation portion convert the electrical signal into a radiation signal emitted by the antenna device.