Low-Profile Antenna Using Conical and Disk Elements
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Solution Overview
Problem
Conventional low-profile antennas are limited in their ability to operate across multiple frequency bands efficiently while maintaining a compact size, often requiring larger dimensions to achieve desired radiation efficiency and bandwidth.
Innovation Solution
The design incorporates a ground region with meandering slots, a conical radiating element, and a flat disk-shaped radiating element, supported by conductive elements that form both galvanic and capacitive connections, along with a coaxial feed arrangement, to create a multiband antenna with a height of less than 25 mm, enabling operation across 700-960 MHz and 1710-2700 MHz frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional low-profile antenna designs are used, then the antenna can be compact in size, but the radiation efficiency and bandwidth are limited
Solution Approach 1:
The antenna is segmented into multiple functional regions: a ground region with meandering slots, a conical radiating element, and a flat disk-shaped radiating element. This segmentation allows each region to contribute specifically to radiation efficiency while maintaining overall compactness
Solution Approach 2:
The patent transitions from conventional planar antenna designs to a three-dimensional conical radiating element. This dimensional change enables improved radiation efficiency by creating additional current paths and radiation surfaces without proportionally increasing the antenna's footprint area
2Adaptability or versatility
If conventional low-profile antenna designs are used, then the antenna structure can be simple, but the multiband operation capability is insufficient
Solution Approach 1:
The conical radiating element serves multiple functions: it acts as the primary radiating structure, provides impedance transformation, and enables multiband operation when combined with the meandering slots in the ground region. This multi-functionality achieves broad frequency coverage without adding separate antenna elements
Solution Approach 2:
The meandering slots in the ground region are designed with specific geometric parameters that create resonant frequencies at different bands. By adjusting the slot dimensions, spacing, and meandering patterns, the antenna achieves multiband operation (including LTE bands) without requiring complex switching mechanisms or multiple independent elements
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 results in an extremely low-profile antenna that achieves improved radiation efficiency and omnidirectional performance across multiple frequency bands, with optimized voltage standing wave ratio (VSWR) and reduced height compared to conventional broadband multiband antennas.
Implementation Method 1
at least one of the multiplicity of conductive elements forms a galvanic connection between the generally conical radiating element and the ground region
Implementation Method 2
at least one of the multiplicity of conductive elements forms a capacitive connection between the generally conical radiating element and the ground region
Implementation Method 3
the generally conical radiating element in combination with the ground region and the generally flat disk-shaped radiating element radiating in a low-frequency band and the generally conical radiating element in combination with the generally flat disk-shaped radiating element radiating in a high-frequency band
Data Source
AI summary
An antenna, including a ground region having a plurality of meandering slots formed therein, a generally conical radiating element supported on the ground region and spaced apart therefrom and a generally flat disk-shaped radiating element disposed between the generally conical radiating element and the ground region, the generally flat disk-shaped radiating element feeding the generally conical radiating element.