Planar Antenna Layout for Compact TETRA and GPS Band Coverage
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Solution Overview
Problem
Designing a wideband antenna structure for mobile devices that operates effectively across multiple frequency bands while maintaining a small size is a challenge, as narrow operational bandwidths can negatively impact communication quality.
Innovation Solution
A planar antenna structure is created using a ground element, a first radiation element with a meandering portion, and a second radiation element, all disposed on a dielectric substrate, with a coupling gap between them, allowing for coverage of the TETRA and GPS frequency bands with optimized dimensions and shapes to minimize size and enhance bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional antenna structure is used, then the manufacturing is simple, but the operational bandwidth is narrow
Solution Approach 1:
The antenna structure is divided into multiple radiation elements (first radiation element, second radiation element, third radiation element) with distinct functions. Each element contributes to different frequency bands, allowing the antenna to cover wide bandwidth (TETRA and GPS bands) through segmented functional components rather than a single complex structure.
Solution Approach 2:
The second radiation element is positioned within the space defined by the first radiation element, and the third radiation element is coupled to the second. This nested arrangement allows multiple radiation elements to occupy minimal space while maintaining their individual radiation characteristics, achieving wide bandwidth coverage without increasing overall device footprint.
2Volume of moving object
If the antenna size is reduced, then the device compactness is improved, but the radiation efficiency decreases
Solution Approach 1:
The antenna structure transitions from planar to three-dimensional configuration with radiation elements arranged in different spatial layers and orientations. The first radiation element extends in one direction, the second is nested within its space, and the third is coupled to the second, creating a立体 structure that maintains effective radiation area while minimizing footprint.
Solution Approach 2:
Different radiation elements are designed with specific local characteristics optimized for their functions. The first radiation element has a feeding point and meandering portion for TETRA band optimization, the second radiation element has variable-width sections for impedance matching, and the third radiation element provides additional radiation. Each element's local structure is optimized to maintain radiation efficiency in the compact overall design.
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 proposed antenna structure achieves efficient coverage of the TETRA and GPS frequency bands with improved radiation efficiency and operational bandwidth, meeting the requirements for general mobile communication devices while maintaining a compact size and low manufacturing complexity.
Implementation Method 1
A planar antenna structure is formed by the first radiation element and the second radiation element. The planar antenna structure covers a TETRA (Terrestrial Trunked Radio) frequency band and a GPS (Global Positioning System) frequency band.
Implementation Method 2
The ground element, the first radiation element, and the second radiation element are all disposed on the dielectric substrate.
Data Source
AI summary
A mobile device includes a ground element, a first radiation element, a second radiation element, and a dielectric substrate. The first radiation element has a feeding point. The first radiation element includes a meandering portion. The second radiation element is coupled to the feeding point, and is at least partially surrounded by the first radiation element. A coupling gap is formed between the first radiation element and the second radiation element. The ground element, the first radiation element, and the second radiation element are all disposed on the dielectric substrate. A planar antenna structure is formed by the first radiation element and the second radiation element. The planar antenna structure covers a TETRA (Terrestrial Trunked Radio) frequency band and a GPS (Global Positioning System) frequency band.