Compact Dual-Band Antenna with Nested Parallel Elements
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Solution Overview
Problem
Dual-band antennas with a second antenna element branching off from the first element face challenges in compact design and impedance matching, making them difficult to mount in limited spaces.
Innovation Solution
A dual-band antenna design featuring a ground plane with a first antenna element extending parallel to its edge, a second antenna element between the edge and the first, and a third antenna element that turns back to connect with the first, allowing for compact integration and easy impedance adjustment by adjusting the positions and lengths of these elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a second antenna element branches off from the first antenna element, then dual-band operation is achieved, but the antenna becomes difficult to mount in limited space
Solution Approach 1:
The antenna elements are arranged in a planar configuration rather than extending in three-dimensional space. The first, second, and third antenna elements are positioned to extend substantially parallel to each other in a two-dimensional plane, reducing the volume required for mounting while maintaining dual-band operation capability
Solution Approach 2:
The second antenna element is disposed between the ground plane edge and the first antenna element, effectively nesting the elements within each other's spatial envelope. This nested arrangement allows multiple antenna elements to occupy overlapping or adjacent regions in the planar domain, minimizing the overall mounting footprint
2Reliability
If antenna element shapes and dimensions are adjusted for impedance matching, then impedance matching with transmitting and receiving circuits is achieved, but the design complexity increases
Solution Approach 1:
Impedance matching is achieved by adjusting the lengths and positions of the antenna elements as geometric parameters. The first antenna element has a specific length for first-band matching, while the second and third elements are dimensioned for second-band operation. These parameter adjustments provide straightforward impedance control without complex structural modifications
Solution Approach 2:
The antenna is divided into separate functional elements (first, second, and third antenna elements) that can be independently dimensioned and positioned. This segmentation allows each element to be optimized for specific frequency band impedance requirements, simplifying the overall impedance matching design process
Data Source
AI summary
An antenna having a ground plane having an edge and a first antenna element extending substantially parallel to the edge is disclosed. A ground element electrically connects the first antenna element with the ground plane. A second antenna element extends substantially parallel to the first antenna element and is disposed between the edge and the first antenna element and is connected at one end of the second antenna element to the first antenna element with the remaining end of the second antenna element located closer to the ground element. A third antenna element is disposed so that the first antenna element is between the second antenna element and the third antenna element and the third antenna element at extends substantially parallel to the first antenna element, with a rear end electrically connected with the first antenna element and a remaining end of the third antenna element is electrically open.