Reconfigurable Parasitic Antenna for Wideband Directivity Control
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Solution Overview
Problem
Existing antenna systems are limited to operating at specific discrete frequencies, typically 2.4GHz and 5GHz, and are optimized for monochromatic signals, restricting their application to narrow frequency bands and reducing directivity outside these frequencies.
Innovation Solution
An antenna system with active radiating members and parasitic members configured to emit and receive electromagnetic signals across a wide frequency band from 100KHz to 100THz, utilizing selective coupling of conductive sections with switching devices and an electronic control unit to vary directivity and radiation patterns across multiple frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the antenna system is configured to operate at specific discrete frequencies (2.4GHz and 5GHz), then the directivity and performance are optimized at these reference frequencies, but the system cannot transmit or receive signals with frequencies falling within different bands and the field of application is limited
Solution Approach 1:
The antenna system employs dynamically reconfigurable parasitic members that can be selectively coupled to active radiating members through switching devices. This dynamic configuration allows the antenna to adapt its radiation pattern and directivity for different frequency bands (2.4GHz, 5GHz, and other bands), resolving the contradiction between optimized performance at reference frequencies and versatility across frequency bands.
Solution Approach 2:
The system changes physical parameters by selectively coupling different parasitic members to active radiating members based on the operating frequency band. The switching devices alter the electrical characteristics and radiation patterns of the antenna system, enabling it to maintain high directivity across multiple frequency bands rather than being limited to discrete reference frequencies.
2Manufacturing precision
If the antenna system is optimized for monochromatic signals at discrete frequencies, then the electrical operating characteristics correspond to design values within a narrow band, but the system cannot effectively emit and receive signals belonging to different frequency bands
Solution Approach 1:
The antenna system achieves multi-functionality by incorporating multiple active radiating members and multiple parasitic members that can be selectively coupled together. This universal design enables the same antenna system to operate effectively across multiple frequency bands (2.4GHz, 5GHz, and other bands) while maintaining design specification accuracy for each band through selective configuration.
Solution Approach 2:
The switching devices enable dynamic reconfiguration of the antenna system, allowing it to transition between different operational modes optimized for different frequency bands. This dynamic adaptability resolves the contradiction between maintaining precise design specifications for monochromatic operation and achieving versatile multi-band operation.
3Ease of operation
If the antenna uses parasitic members coupled to active radiating members with switching devices, then the directivity can be varied according to demand, but the system complexity increases
Solution Approach 1:
The system uses switching devices to dynamically control the coupling between parasitic members and active radiating members, enabling directivity variation according to operational demand. This dynamic control mechanism provides ease of operation for directivity adjustment while managing system complexity through automated switching based on frequency band and directivity requirements.
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
Enables the transmission and reception of electromagnetic signals with variable frequencies within a broad bandwidth, maintaining consistent design specifications and high directivity across different frequency bands, overcoming the limitations of monochromatic systems.
Implementation Method 1
a plurality of parasitic members configured to selectively resonate with the first or with the second antennas
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 2C~3A
AI summary
The invention is an antenna system (1) comprising: at least one active radiating member (2) designed to emit and receive an electromagnetic signal (E) with frequency (fE) included between 100KHz and 100THz; at least one substantially laminar parasitic member (5) designed to be positioned peripherally with respect to the active member (2) and provided with two or more conductive sections (6, 7, 8, 9) having predetermined shape and length and configured to be selectively coupled with the radiating member (2) in such a way as to vary the directivity and the radiation pattern of the electromagnetic field emitted by the system; a plurality of switching devices (13) associated with the conductive sections (6, 7, 8, 9) to selectively connect the conductive sections (6, 7, 8, 9) to a reference potential (P) and promote their selective coupling with the active member (2); an electronic control unit (8) designed to selectively power the active member (3) with a predetermined electric signal and to control the status of the switching devices (13). The active member (2) is configured to emit an electromagnetic signal with frequency included within an operating band (B) whose width exceeds 5% of the frequency (fE ') of the electric signal with which it is powered, the conductive section (6, 7, 8, 9) formed in the parasitic member (5) is configured to be coupled with the active member (2) when the frequency (fE) of the electromagnetic signal (E) emitted by the latter is included in a respective predetermined sub-band (B1, B2,...) of the operating band (B).