Multi-band Antenna with Segmented Radiating Elements
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Designing multi-band, wide-band antennas that effectively cover a wide range of frequency bands, especially those far apart, is a challenging task due to the need for antennas to operate efficiently across diverse frequency ranges without significant performance degradation.
Innovation Solution
The development of a multi-band, wide-band antenna with upper and lower radiating elements and a gap between them, allowing for impedance matching and operation across multiple frequency bands by configuring the antenna to function as a dipole antenna for different frequency ranges, with the upper elements acting as radiators and the lower elements as ground, and utilizing slots for broadbanding and impedance matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single antenna design is used to cover wide frequency ranges, then frequency coverage is improved, but impedance matching and performance consistency deteriorate
Solution Approach 1:
The antenna is divided into multiple radiating elements with different lengths, where each element is responsible for radiating in specific frequency bands. The longer elements handle lower frequencies while shorter elements handle higher frequencies, allowing each segment to be optimized for its specific band while collectively covering a wide frequency range with consistent impedance matching.
Solution Approach 2:
Different portions of the antenna structure are given different electrical lengths and geometries to optimize performance for specific frequency bands. The radiating elements have varying lengths and the ground structure has specific configurations that create localized impedance characteristics tailored to different frequency ranges, enabling broad coverage while maintaining reliable impedance matching at each frequency.
2Adaptability or versatility
If multiple radiating elements are added to cover more frequency bands, then frequency coverage is improved, but device complexity increases
Solution Approach 1:
Multiple radiating elements with different lengths are merged into a single integrated antenna structure that shares common feed points and ground structures. This combining approach allows the antenna to cover multiple frequency bands while avoiding the complexity of separate antenna systems, as all elements work together from a unified structure with coordinated feeding.
Solution Approach 2:
The antenna structure is designed so that the same physical structure serves multiple functions across different frequency bands. The radiating elements and ground structure simultaneously provide impedance matching, radiation, and grounding functions for multiple frequency ranges, reducing overall device complexity while achieving broad frequency coverage.
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 antenna achieves good voltage standing wave ratios (VSWR) and gain across various frequency bands, maintaining efficiency even as the radiation pattern transitions from omnidirectional to less omnidirectional at higher frequencies, effectively covering frequencies from 698 MHz to 6000 MHz with improved bandwidth and impedance matching.
Implementation Method 1
A gap 416 is provided between the upper and lower portions 402, 404... coupling of the gap and the upper and lower radiating elements enable multi-band, wide-band operation
Implementation Method 2
upper radiating elements operable as a radiating portion of the antenna... lower radiating elements operable as a ground portion
Data Source
AI summary
Disclosed herein are various exemplary embodiments of multi-band, wide-band antennas. In exemplary embodiments, the antenna generally includes an upper portion and a lower portion. The upper portion includes two or more upper radiating elements and one or more slots disposed between the two or more upper radiating elements. The lower portion includes three or more lower radiating elements and one or more slots disposed between the three or more lower radiating elements. A gap is between the upper and lower portions such that the upper radiating elements are separated and spaced apart from the lower radiating elements. The antenna may be configured such that coupling of the gap and the upper and lower radiating elements enable multi-band, wide-band operation of the antenna within at least a first frequency range and a second frequency range, with the upper radiating elements operable as a radiating portion of the antenna, the lower radiating elements operable as a ground portion, and the gap operable for impedance matching.