Polyphase Waveguide Probe Guided Surface Waves
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Solution Overview
Problem
For over a century, there has been no practical structure for efficiently launching open surface guided waves over planar or spherical surfaces of lossy, homogeneous media, despite theoretical possibilities.
Innovation Solution
The development of polyphase waveguide probes that excite radial surface currents to synthesize surface-waveguide modes on lossy conducting media, such as the Earth, by generating electromagnetic fields mode-matched to Zenneck surface waves, allowing for the launch of guided surface waves with minimal reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional antenna structures are used to transmit radio waves, then radiation fields can be launched, but energy loss is high and transmission distance is limited
Solution Approach 1:
The patent introduces surface-waveguide modes as an intermediary transmission mechanism between the transmitter and receiver. These modes are excited by waveguide probes that couple electromagnetic energy into guided surface waves propagating along the Earth's surface, reducing energy loss compared to conventional radiation fields. The guided modes act as a mediator that efficiently transports energy over long distances with minimal attenuation.
Solution Approach 2:
The patent changes the fundamental transmission parameter from radiating electromagnetic fields to guided surface waves. By using polyphase waveguide probes to excite specific modal patterns, the system transforms the propagation characteristics from high-loss radiation to low-loss guided transmission along the Earth's surface, fundamentally altering the energy transmission mechanism.
2Productivity
If guided surface wave modes are used, then energy loss is reduced and transmission distance is extended, but no practical structure existed for efficient launching
Solution Approach 1:
The patent segments the waveguide probe into multiple elements (typically three probes spaced one-third wavelength apart) that are individually controlled with specific phase relationships. This segmentation allows the construction of complex modal patterns through the superposition of simpler individual probe fields, making the otherwise complex guided wave excitation achievable with manageable structural components.
Solution Approach 2:
The patent employs periodic phase relationships among the waveguide probe elements, with each probe excited at a specific phase offset (0, 120, and 240 degrees for three-element arrays). This periodic phase structure creates the desired guided surface wave modes through constructive and destructive interference patterns, enabling efficient mode excitation through regular, repeatable phase control.
3Length of stationary object
If surface waves are launched over lossy media, then long-distance transmission is achieved, but signal attenuation occurs due to Earth's conductivity losses
Solution Approach 1:
The patent converts the Earth's conductive properties, which normally cause energy loss for radiating fields, into a beneficial guiding mechanism. By exciting surface-waveguide modes that propagate along the Earth's surface, the system uses the Earth's conductivity to confine and guide the electromagnetic energy, transforming what would be radiative loss into guided transmission with reduced attenuation over long distances.
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 enables efficient propagation of guided surface waves with reduced energy loss, as the waves are bound to the surface and can travel long distances with minimal attenuation, outperforming conventional radiation methods.
Implementation Method 1
The polyphase waveguide probe generates electromagnetic fields that are mode-matched to a Zenneck surface wave mode on the surface of the lossy conducting medium
Implementation Method 2
A Zenneck surface wave is launched when the electromagnetic fields generated by the polyphase waveguide probe are substantially mode-matched to a Zenneck surface wave mode on the surface of the lossy conducting medium
Data Source
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AI summary
Disclosed are various embodiments for transmitting and/or receiving energy conveyed in the form of a guided surface-waveguide mode along the surface of a lossy conducting medium by exciting a polyphase waveguide probe.