3D Compound Loop Antenna Orthogonal Field Generation
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Solution Overview
Problem
Conventional antennas face challenges in achieving high radiation efficiency and compact size due to size constraints in modern wireless communication devices, with conventional loop antennas being inefficient in both transmit and receive modes and lacking in radiation energy due to limited area.
Innovation Solution
The development of three-dimensional compound loop antennas with a ground plane, horizontal and vertical conductive portions, and a feed line, which generates both electric and magnetic fields orthogonally to enhance radiation efficiency and enable both transmit and receive modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional loop antennas are used, then the antenna structure is simple and easy to manufacture, but the radiation efficiency is low and the antenna cannot effectively transmit electromagnetic energy
Solution Approach 1:
The patent transitions from conventional two-dimensional planar loop antennas to a three-dimensional structure by adding vertical conductive portions that extend perpendicular to the ground plane. This dimensional change enables the antenna to generate both electric and magnetic fields simultaneously, transforming it from a magnetic-field-only radiator to a compound antenna that radiates in multiple dimensions, thereby significantly improving radiation efficiency while maintaining manufacturing feasibility
Solution Approach 2:
The patent employs a composite structure combining horizontal conductive portions parallel to the ground plane with vertical conductive portions perpendicular to the ground plane. This composite configuration creates a compound loop antenna where the horizontal portions generate magnetic fields and the vertical portions generate electric fields, resulting in a hybrid antenna system that overcomes the limitations of conventional single-mode loop antennas
2Volume of moving object
If the area of the loop antenna is reduced to achieve compact size, then the antenna fits within device space constraints, but the amount of radiation energy received is reduced by approximately 3 dB for each halving of the area
Solution Approach 1:
The patent adds the vertical dimension to the traditional planar loop structure by incorporating vertical conductive portions that extend upward from the ground plane. This three-dimensional configuration increases the effective radiating volume and surface area without proportionally increasing the device footprint, allowing compact integration while maintaining or enhancing radiation energy capture compared to reduced-area planar loops
Solution Approach 2:
The compound loop antenna structure serves multiple functions simultaneously: the horizontal portions function as traditional magnetic-field radiators while the vertical portions add electric-field radiation capability. This multi-functionality allows the antenna to operate effectively in both transmit and receive modes, compensating for the reduced area through enhanced field generation capabilities rather than relying solely on large surface area
3Loss of energy
If conventional voltage fed antennas such as dipoles are used, then both electric and magnetic fields are radiated enabling transmit and receive modes, but the antenna requires larger physical volume to achieve resonance at particular frequencies
Solution Approach 1:
The patent embeds the compound loop antenna structure within a compact footprint by nesting the vertical conductive portions within the space above the ground plane and positioning horizontal portions close to the ground surface. This nested configuration allows the antenna to achieve resonant dimensions for both electric and magnetic field generation without requiring the large physical volume of conventional dipoles, as the structure efficiently utilizes the three-dimensional space above the ground plane
Solution Approach 2:
By introducing the vertical dimension with conductive portions extending perpendicular to the ground plane, the patent enables resonance at operating frequencies within a compact volume. The vertical portions provide the necessary electrical length for electric field generation without requiring the extended physical length of conventional dipoles, as the ground plane and vertical structure together create the resonant condition in a space-efficient manner
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 3D CPL antennas achieve high radiation efficiency and directional radiation patterns, overcoming the limitations of conventional antennas by optimizing the Poynting vector and maintaining resonance and stability with a low profile design suitable for various applications.
Implementation Method 1
a feed line substantially vertical relative to the ground plane and coupled with the pair of horizontal conductive portions
Implementation Method 2
a pair of horizontal conductive portions substantially horizontal relative to the ground plane... a vertical conductive portion coupling the pair of horizontal conductive portions to the ground plane
Data Source
AI summary
A three-dimensional compound loop antenna is provided, including a ground plane, a pair of horizontal conductive portions substantially horizontal relative to the ground plane, a feed line substantially vertical relative to the ground plane, and a vertical conductive portion coupling the pair of horizontal conductive portions to the ground plane.