Conformal Magnetic Loop Antenna for RF Interference Mitigation
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Solution Overview
Problem
Existing low-powered local RF transmission systems in performance spaces face interference from external RF generators, leading to signal degradation and reliability issues due to crowded RF spectrum, with conventional antennas exacerbating the problem by picking up unwanted signals and having limited dynamic range.
Innovation Solution
A flat, flexible magnetic loop antenna system is placed close to the floor, with embedded loops and a robust matching section, optimized for high-angle, close-proximity signal pickup and low-angle rejection, using frequency-controlled transmitters and a constellation of antennas tuned to zero-beat frequencies to reduce heterodyne interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional long distance antenna systems are used for in-building use, then coverage area is improved, but interference from external RF generators increases
Solution Approach 1:
The patent employs multiple localized antennas positioned throughout the building rather than a single distant antenna. Each antenna serves a specific local zone, providing coverage area improvement while limiting the reception range to reduce external interference. The localized deployment ensures that each antenna primarily picks up signals from nearby transmitters rather than distant external RF generators.
Solution Approach 2:
The system divides the coverage area into multiple zones, each served by a separate antenna. This segmentation allows the building to achieve comprehensive coverage through coordinated multiple antennas while each individual antenna maintains a limited effective range, thereby reducing susceptibility to external interference compared to a single long-distance antenna system.
2Reliability
If conventional antennas are used, then signal reception is achieved, but selectivity against unwanted signals deteriorates
Solution Approach 1:
The system uses multiple antennas positioned at different locations and orientations around the building. This spatial segmentation provides diversity reception, where the combined effect of multiple antenna signals improves both reception reliability and selectivity. The geometric arrangement allows the system to distinguish between desired local signals and unwanted external signals through spatial filtering.
Solution Approach 2:
The patent employs a composite antenna system combining multiple antenna elements with different radiation patterns and polarizations. This composite structure enhances both signal reception and selectivity by providing multiple reception paths that can be processed to improve signal-to-noise ratio and reject unwanted signals through constructive and destructive interference patterns.
3Productivity
If multiple transmitters operate on the same frequency, then spectrum utilization is improved, but heterodyne interference increases
Solution Approach 1:
The system divides the service area into multiple zones with geographically separated transmitters operating on the same frequency. The localized antennas ensure that each transmitter is primarily received by nearby antennas, enabling frequency reuse across different zones. The spatial separation and localized reception minimize heterodyne interference by ensuring that transmitters operating on the same frequency are not simultaneously received with sufficient strength to cause beat notes.
Solution Approach 2:
The network of localized antennas acts as an intermediary between transmitters operating on the same frequency. By providing spatially distributed reception points, the antenna system enables the same frequency to be used in different locations without direct interference, as each antenna-transmitter pair operates semi-independently within its local zone.
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 solution effectively reduces interference from distant sources, enhances signal pickup for desired signals, and allows multiple antennas to operate on the same channel without mutual interference, improving reliability and spectrum reuse in performance spaces.
Implementation Method 1
a first floor antenna and a second floor antenna, each having a magnetic loop type construction and each optimized for high angle, close proximity sources
Implementation Method 2
Frequency modulation (FM) is known for the so-called capture effect, which reduces interference
Implementation Method 3
source oscillators are not precise, and synthesizers used to generate multiple frequencies may be noisy and produce inter-system interference and beat notes
Data Source
AI summary
A conformal antenna system comprising one or more proximate antenna elements for very reliable localized reception and transmission of radiowave energy and power particularly in frequency controlled VHF, UHF and microwave spectrum is described. The system incorporates effective angle or proximity dependent interference mitigation for conventional transmitters/receivers or master controlled constellations of wireless devices, and is suitable for temporary or permanent installation and use in a variety of outdoor and in-building locations. The antenna elements are configured and optimized for close proximity but unobtrusive positioning near the point of use on stages, in concert halls, movie studios, houses-of-worship, and convention centers, and are configured to be relatively unaffected by people or furniture in very close proximity. Methods for manufacturing and using close proximity antennas are disclosed, as are systems and methods for the generation and control of signals thereto.