Quasi-Optical Coupler for Surface Wave Transmission
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Solution Overview
Problem
The increasing demand for mobile bandwidth due to ubiquitous smartphones and portable devices overwhelms existing macrocell base stations, necessitating the deployment of small cells like microcells and picocells, which is costly and inefficient.
Innovation Solution
A surface wave communication system using quasi-optical coupling devices that transmit and receive millimeter-wave band signals as guided waves along wires, enabling efficient network connectivity between base stations and distributed antennas without direct contact with high-voltage power cables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If small cells (microcells and picocells) are deployed to provide additional mobile bandwidth, then network coverage and capacity are improved, but installation cost and complexity increase
Solution Approach 1:
The patent introduces a quasi-optical coupling device as an intermediary component that couples millimeter-wave signals to existing utility wires. This mediator enables signal transmission over existing infrastructure without requiring direct contact with high-voltage power cables, thus reducing deployment complexity while maintaining network capacity expansion goals
Solution Approach 2:
The patent replaces direct mechanical contact with high-voltage power cables (dangerous and complex installation) with a quasi-optical coupling mechanism that uses electromagnetic field interaction. This substitution eliminates the need for direct electrical contact, simplifying installation and improving safety while achieving the same signal transmission objective
2Use of energy by moving object
If direct contact with high-voltage power cables is used for signal transmission, then signal coupling efficiency is improved, but safety hazards and installation difficulty increase
Solution Approach 1:
The quasi-optical coupling device serves as a safe intermediary that couples millimeter-wave signals to utility wires through electromagnetic interaction without direct electrical contact. This mediator maintains signal coupling efficiency while eliminating exposure to high-voltage dangers
Solution Approach 2:
The patent creates an electromagnetic field interaction copy of the direct-contact coupling mechanism. Instead of physically contacting the high-voltage cable, the system uses a reflected transmission that replicates the coupling effect through electromagnetic fields, achieving the same result without the harmful physical contact
3Reliability
If rigid signal transmission infrastructure is used, then signal stability is improved, but adaptability to wire bends and flexes deteriorates
Solution Approach 1:
The patent utilizes the ability of surface waves to change their propagation parameters according to the wire's geometry. By operating in the surface wave regime, the system automatically adapts to wire bends and flexes while maintaining signal stability, as the surface wave follows the contour of the conductor
Solution Approach 2:
The patent employs a dynamic signal transmission approach where the millimeter-wave signal is converted to a surface wave that dynamically adapts to the wire's configuration. This dynamic adaptation allows the signal to maintain stability regardless of wire bends or flexes, combining the benefits of both rigid and flexible systems
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 solution provides cost-effective and efficient network connectivity by using quasi-optical coupling devices to transmit and receive signals as guided waves along wires, reducing installation costs and maintaining network reliability even with wire bends and flexes.
Implementation Method 1
a reflector, positioned with respect to a wire such that the reflector reflects the transmission in a direction substantially parallel to the wire thereby resulting in a reflected transmission
Implementation Method 2
the reflected transmission is a guided wave that is guided based on a surface of the wire
Data Source
AI summary
A quasi-optical coupling system launches and extracts surface wave communication transmissions from a wire. At millimeter-wave frequencies, where the wavelength is small compared to the macroscopic size of the equipment, the millimeter-wave transmissions can be transported from one place to another and diverted via lenses and reflectors, much like visible light. Transmitters and receivers can be positioned near telephone and power lines and reflectors placed on or near the cables can reflect transmissions onto or off of the cables. The lenses on the transmitters are focused, and the reflectors positioned such that the reflected transmissions are guided waves on the surface of the cables. The reflectors can be polarization sensitive, where one or more of a set of guided wave modes can be reflected off the wire based on the polarization of the guided wave modes and polarization and orientation of the reflector.