Multiband Antenna Design Using Segmented Radiation Elements
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Solution Overview
Problem
Multiband antennas with complex configurations due to blocking circuits for signal isolation between low and high frequency bands are difficult to implement in small mobile terminals, which complicates their design and functionality.
Innovation Solution
A multiband antenna apparatus with a simple configuration, featuring radiation elements on a substrate, connection lines, conductors with slots, and power supply lines that allow resonance in multiple frequency bands without the need for blocking circuits, by optimizing the placement and length of these components to achieve efficient signal isolation and directivity control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If blocking circuits are added to isolate signals between low and high frequency bands, then signal isolation is improved, but device complexity increases
Solution Approach 1:
The antenna is divided into separate low-frequency and high-frequency radiation elements that are spatially segmented and independently excited. The low-frequency element and high-frequency element are positioned at different locations on the substrate, allowing each to operate independently in its respective frequency band without requiring blocking circuits for signal isolation.
Solution Approach 2:
Different regions of the antenna structure are designed with locally optimized properties: the low-frequency radiation element has a larger effective area and different geometric characteristics suited for low-frequency operation, while the high-frequency radiation element has dimensions optimized for high-frequency resonance. This local differentiation allows each element to operate independently without interfering with the other.
2Adaptability or versatility
If multiband antenna is designed to support multiple frequency bands, then adaptability is improved, but device complexity increases
Solution Approach 1:
The antenna substrate serves multiple functions: it provides the mounting surface for both low-frequency and high-frequency radiation elements, acts as the ground plane for both elements, and provides mechanical support for the entire multiband antenna structure. This universal substrate design enables multiband operation without requiring separate support structures for each frequency band.
Solution Approach 2:
The low-frequency radiation element and high-frequency radiation element are merged into a single antenna assembly on one substrate, sharing common structural resources such as the substrate itself and the mounting configuration. This merging approach achieves multiband adaptability while minimizing overall device complexity compared to having separate antennas for each frequency band.
3Volume of moving object
If antenna size is reduced for small mobile terminals, then device compactness is improved, but space for antenna elements is reduced
Solution Approach 1:
The antenna elements are configured to utilize three-dimensional space effectively by positioning the low-frequency and high-frequency radiation elements at different locations and orientations on the substrate. The elements are arranged to minimize planar footprint while maintaining adequate separation for independent operation, allowing compact integration into small mobile terminals.
Solution Approach 2:
The high-frequency radiation element is positioned in a region that does not interfere with the low-frequency element's operation, effectively nesting the two elements within the same antenna structure. The elements are arranged concentrically or in a compact configuration that allows both to coexist in a small overall footprint, enabling multiband operation in space-constrained mobile terminals.
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 solution enables a compact, efficient, and adaptable multiband antenna that simplifies the design and improves isolation characteristics between frequency bands, eliminating the need for blocking circuits and allowing operation across multiple frequency bands, including high-speed and large-capacity radio communication.
Implementation Method 1
at least one first radiation element provided on one surface of a substrate and having a resonance frequency in a first frequency band; at least one second radiation element provided on the one surface of the substrate; a line length formed by the first radiation element, the connection line, and the second radiation element is set to a length so as to have a resonance frequency in a second frequency band
Data Source
AI summary
Provided is an antenna device with a simple configuration, said antenna device supporting a plurality of frequency bands. An antenna device according to the present invention is provided with: at least one first radiation element that has a resonant frequency in a first frequency band; at least one second radiation element; and a connection line for connecting the first radiation element and the second radiation element. The line length formed of the first radiation element, the connection line, and the second radiation element is set to a length so as to have a resonant frequency in a second frequency band lower than the first frequency band.