Passive RF Redirector for Urban Coverage Gaps
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Solution Overview
Problem
Providing reliable radio-frequency coverage in urban areas is challenging due to large buildings and high-rises, which often result in areas with radio-frequency coverage below the specified minimum level, leading to increased costs for tower and rooftop antenna deployments and maintenance.
Innovation Solution
A passive radio-frequency redirector device comprising a polarized antenna and a directional antenna, which are passively coupled and configured to produce complementary and cross-polarized radiation patterns, allowing for efficient redirection of RF signals without the need for power sources or active electronic devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tower and rooftop antennas are deployed to provide radio-frequency coverage, then radio-frequency coverage is improved, but installation and maintenance costs increase due to power requirements and site availability limitations
Solution Approach 1:
The passive redirector device redirects radio-frequency signals without requiring external power sources. The device uses passive electromagnetic coupling between antennas, eliminating the need for power supply infrastructure, electrical connections, and associated safety systems that active repeaters require.
Solution Approach 2:
The patent replaces active electronic signal processing systems with passive electromagnetic field-based signal redirection. The passive redirector uses electromagnetic coupling between a first antenna and a second antenna to redirect signals without active electronic components, power amplifiers, or signal processing electronics.
2Reliability
If more antenna sites are deployed to improve radio-frequency coverage in urban areas, then coverage reliability is improved, but the number of sites is limited by cost and availability
Solution Approach 1:
The passive redirector device can be deployed on buildings without power infrastructure by utilizing the existing radio-frequency signals from tower or rooftop antennas. The device passively redirects signals to areas with insufficient coverage, effectively increasing coverage capacity without adding powered antenna sites.
3Power
If powered devices are installed at deployment sites to provide radio-frequency coverage, then signal transmission is improved, but installation and maintenance costs increase due to power requirements
Solution Approach 1:
The passive redirector device harvests energy from the incident radio-frequency signals themselves through passive electromagnetic coupling. The device does not require external power sources, power supply infrastructure, or electrical connections, thereby eliminating maintenance costs associated with powered equipment.
Solution Approach 2:
The device converts the limitation of passive operation into an advantage by eliminating all power-related infrastructure requirements. What would normally be seen as a disadvantage (lack of active signal amplification) is offset by the complete elimination of power supply, safety, and maintenance infrastructure.
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 device enhances radio-frequency coverage in urban areas by redirecting RF signals effectively, reducing the need for additional antenna deployments and maintenance costs while maintaining reliable communication.
Implementation Method 1
a polarized antenna configured to produce a radiation pattern in an azimuthal plane; and a directional antenna configured to produce a directional radiation pattern that is substantially complementary to the radiation pattern of the polarized antenna
Data Source
AI summary
A passive radio-frequency redirector device is provided that includes: a polarized antenna configured to produce a radiation pattern in an azimuthal plane; and a directional antenna configured to produce a directional radiation pattern that is substantially complementary to the radiation pattern of the polarized antenna, wherein the directional radiation pattern is substantially cross-polarized relative to the radiation pattern of the polarized antenna, and the polarized antenna and the directional antenna are passively coupled together.