Slot-Frame Antenna Layout for Compact Omnidirectional Coverage
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Solution Overview
Problem
Designing an omnidirectional antenna that is both small in size and effective for wireless communication, as high directivity in existing antennas degrades communication quality.
Innovation Solution
An antenna structure comprising a dielectric substrate, a conductive frame with a slot region, and two radiation elements positioned inside the slot, which are coupled to a feeding point and each other, along with a system ground plane to enhance omnidirectional characteristics and reduce size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the directivity of an antenna is increased to improve signal transmission, then the radiation pattern becomes more directional, but the communication quality degrades due to loss of omnidirectional coverage
Solution Approach 1:
The antenna structure is divided into multiple radiation elements (first radiation element and second radiation element) arranged within the slot region of the conductive frame. Each radiation element contributes to different aspects of the radiation pattern, allowing the antenna to achieve omnidirectional coverage while maintaining a compact form factor. The segmentation of the radiation function across multiple elements enables both wide coverage and small size.
Solution Approach 2:
The first and second radiation elements are positioned inside the slot region of the conductive frame, creating a nested structure where the radiation elements are contained within the boundary defined by the conductive frame. This nesting arrangement allows the antenna to achieve omnidirectional radiation characteristics while maintaining a compact overall size, as the radiation elements are efficiently utilized within the confined slot region.
2Volume of moving object
If the antenna size is reduced to make the device compact, then the device size decreases, but the radiation pattern becomes less omnidirectional
Solution Approach 1:
The conductive frame is designed with a specific slot region that provides localized electromagnetic field distribution optimized for omnidirectional radiation. The slot region's geometry and position are carefully designed to create favorable local electromagnetic conditions that enable omnidirectional radiation patterns even within a compact antenna volume. This local quality optimization allows the antenna to maintain omnidirectionality despite size constraints.
Solution Approach 2:
The antenna structure utilizes three-dimensional spatial arrangement of the radiation elements within the slot region to achieve omnidirectional radiation. By positioning the first and second radiation elements at different locations and orientations within the confined slot region, the antenna achieves omnidirectional coverage through spatial diversity rather than requiring a large planar area, thus maintaining compact volume while preserving omnidirectionality.
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 structure achieves an almost omnidirectional radiation pattern, supports wideband operations, and maintains high gain while being compact, suitable for various communication systems including V2X and WLAN 5 GHz.
Implementation Method 1
The first radiation element is disposed on the second surface of the dielectric substrate, and is coupled to a feeding point. The second radiation element is disposed on the first surface of the dielectric substrate, and is coupled to the conductive frame.
Data Source
AI summary
An antenna structure includes a dielectric substrate, a conductive frame, a first radiation element, and a second radiation element. The dielectric substrate has a first surface and a second surface which are opposite to each other. The conductive frame is disposed on the first surface of the dielectric substrate. The conductive frame has a slot region. The first radiation element is disposed on the second surface of the dielectric substrate, and is coupled to a feeding point. The second radiation element is disposed on the first surface of the dielectric substrate, and is coupled to the conductive frame. The second radiation element is adjacent to the first radiation element. The first radiation element is partially adjacent to the second radiation element on one side. The first radiation element and the second radiation element are substantially positioned inside the slot region of the conductive frame.