Antenna Arrangement Bandwidth Segmentation
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Solution Overview
Problem
The bandwidth of antenna arrangements in compact radio communication devices is often reduced due to their smaller size, and existing solutions that use tuneable loads to shift frequencies increase device complexity and cost.
Innovation Solution
An antenna arrangement comprising a first and second planar inverted L antenna element, where the second antenna element has portions with different electrical lengths to electromagnetically couple with the first antenna, allowing for overlapping and distinct resonant frequency bands, enabling broader bandwidth without the need for tuneable loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the size of the device is reduced to make it more portable, then the device becomes easier to carry, but the bandwidth of the antenna arrangement decreases
Solution Approach 1:
The second antenna element is divided into two distinct portions with different electrical lengths. The first portion has a second electrical length similar to the first antenna element's length, while the second portion has a third electrical length different from both. This segmentation allows each portion to resonate at different frequency bands, effectively broadening the overall antenna bandwidth despite the compact device size.
2Adaptability or versatility
If tuneable loads are added to shift antenna frequencies to correct operational bands, then frequency adaptability is improved, but the number of components and device cost increase
Solution Approach 1:
The antenna arrangement achieves frequency adaptability through its own intrinsic structure rather than external tuning components. The second antenna element's two portions with different electrical lengths enable the antenna to naturally resonate at multiple frequency bands (first, second, and third resonant frequency bands), eliminating the need for tuneable loads or other active frequency adjustment mechanisms.
3Area of stationary object
If the ground plane dimensions are reduced to decrease device size, then device compactness is improved, but antenna bandwidth decreases
Solution Approach 1:
Different portions of the antenna structure are given different electrical lengths to serve different frequency bands. The first portion of the second antenna element is designed with a second electrical length similar to the first antenna element for coupling purposes, while the second portion has a third electrical length optimized for a different resonant frequency band. This local differentiation of electrical properties allows broad bandwidth operation within a compact ground plane area.
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 effectively broadens the bandwidth of the antenna arrangement, reducing device complexity and cost while maintaining performance across multiple frequency bands, and is less susceptible to external interference.
Implementation Method 1
a first portion which extends from the second feed point and has a second electrical length, similar to the first electrical length, which enables the first portion to electromagnetically couple with the first antenna element
Implementation Method 2
The first antenna element may have a resonant mode at 4. The second antenna may have a resonant mode at 4. The first antenna element may be operable to resonate within a first resonant frequency band. The first portion of the second antenna element may be operable to resonate within a second resonant frequency band.
Data Source
AI summary
An antenna arrangement including a first antenna element connected to a first feed point and having a first electrical length; a second antenna element connected to a second feed point, different to the first feed point, and including: a first portion which extends from the second feed point and has a second electrical length, similar to the first electrical length, which enables the first portion to electromagnetically couple with the first antenna element, and a second portion which extends from the second feed point and has a third electrical length, different to the first electrical length of the first antenna element and to the second electrical length of the first portion.