Invented by Farhad Barzegar, Irwin Gerszberg, Thomas M. Willis, III, Paul Shala Henry, Robert Bennett, Donald J. Barnickel, Giovanni Vannucci, AT&T Intellectual Property I LP
The AT&T Intellectual Property I LP invention works as followsAccording to one or more embodiments of an analog surface wave multiple-point repeater, a launcher is configured to transmit and received first guided electromagnetic waves which propagate along the outer surface of a segment of a medium of transmission without requiring a return path electrical. A transceiver comprises a splitter coupled between a third launcher, a second launcher, and a low-noise amplifier configured to receive second microwave signals from the second and third launchers via the splitter. The directional coupler couples the second microwave from the second Launcher and the first micro signal to the Splitter in order to facilitate the transmission of second guided electromagnetic wave by the Second Launcher on the 2nd segment of transmission medium, and to further facilitate the transmission of third guided electromagnetic wave by the Third launcher on 3rd segment.
Background for Analog Surface Wave Multipoint Repeater and Methods for Use Therewith
Smart phones and other mobile devices are becoming more ubiquitous and data usage is increasing, so macrocell base stations devices and the existing wireless infrastructure will need to have higher bandwidth capabilities in order to meet increased demand.” Small cell deployment is being explored to provide more mobile bandwidth. Picocells and microcells offer coverage in smaller areas than traditional macrocells.
In addition, most households and businesses have come to rely upon broadband data access for services like voice, video, and Internet browsing. Broadband access networks can be used for satellite, 4G, 5G wireless, powerline communication, fiber, cable and telephone networks.
One or more embodiments will now be described using reference to the drawings. Like reference numerals refer to like elements throughout all of the drawings. The following description will provide an explanation of each embodiment. However, it is clear that many embodiments can be used without these details and without applying to any particular standard or networked environment.
In one embodiment, a system for guided wave communication is shown. This allows data and other signals to be sent or received via electromagnetic waves. Guided electromagnetic waves can include surface waves, or other electromagnetic wave types that are guided or bound by a transmission media as described in this document. You will appreciate that many different transmission media are suitable for guided wave communications, without deviating from the example embodiments. Transmission media may include, alone or in combination, one or more of: wires (insulated or uninsulated), whether single-stranded, multi-stranded, or twisted pair cables. Other wire bundles or cables can also be used, as well as rods or rails.
The inducement of electromagnetic waves guided along a transmission media can occur independently of the electrical potential, current or charge that is injected into or transmitted through that medium as part an electrical circuit. In the case of a wire transmission medium, it should be noted that a small amount of current may form in the wire due to the propagation electromagnetic waves along the surface of the wire. This is not the result of electrical potential, current or charge injected into the cable as part of an electric circuit. It is not necessary to have an electrical circuit for the electromagnetic waves to travel along the wire. This wire is therefore a single-wire transmission line and is not a part of an electric circuit. Electromagnetic waves can, for example, propagate along a cable configured as an open electrical circuit. In some embodiments, the wire is not required and electromagnetic waves can be propagated along a single-line transmission medium which is not a conductorless single line medium. In this way, electromagnetic waves are propagated along a transmission medium that is not a wire without the need for an electrical return path.
More generally, ‘guided electromagnetic waves?” Or?guided electromagnetic waves? The subject disclosure describes how the transmission medium is affected by the presence a physical object. This could be a bare wire or any conductor, a dielectric with a dielectric core and/or without an inner shield, a dielectric wire, an insulated or insulator wire bundle or another solid, liquid, or non-gaseous medium, which is at least partially bound or guided by the object, and that propagates along the path of that object. This physical object may be used as at least one part of a transmission media that guides through one or more interfaces of transmission medium (e.g. an outer, inner, or an interior portion between the outer, inner, surfaces, or any other boundary between elements in the transmission medium). A transmission medium can support multiple transmission paths across different surfaces. A stranded wire bundle or cable may be capable of supporting electromagnetic waves. These electromagnetic waves can be guided by the outer surface or bundle of the wire or stranded cables, or by inner cable surfaces that connect two, three, or more wires in the wire bundle or stranded wire. Interstitial areas, such as stranded cables, insulated twisted-pair wires or wire bundles, can allow electromagnetic waves to be guided. The subject disclosure describes how guided electromagnetic waves are launched from a transmitting device and propagate along a transmission medium to be received by at least one receiver device. The transmission of guided electromagnetic waves can carry data, energy and/or other signals from one device to another.
Conductor” as used in this article. Based on the definition of the term “conductor” From IEEE 100, The Authoritative Dictionary of IEEE Standards Terms 7th Edition 2000, it means any substance or body that allows electricity to flow continuously along it. The terms ‘insulator’,?conductorless? are interchangeable. ,?conductorless? Based on the definition of the term “insulator” An insulator is a device or material that prevents electrons or ions from moving easily. This definition comes from IEEE 100, The Authoritative Dictionary of IEEE Standards Terms (7th Edition, 2000). An insulator or conductorless or nonconductive materials can be mixed intentionally (e.g. doped) or unintentionally to create a substance that has a small amount a conductor. The resulting substance might be resistant to continuous electric currents. A conductorless member, such as a dielectric core or dielectric rod, does not have an inner conductor or a shield. The term “eddy current” is used in this document. Based on the definition of the term “conductor” Based on a definition of the term “conductor” in IEEE 100, The Authoritative Dictionary of IEEE Standards Terms (7th Edition, 2000), a current that circulates within a metallic material due to electromotive forces induced from a variation of magnet flux. It is possible for an insulator or conductorless material in the above embodiments to permit eddy currents to circulate within the doped conductor or intermixed conductor. However, such a continuous flow, if any, of an electric current along an insulator or conductorless material is much smaller than the flow of an electricity along a conductor. In the present disclosure, an insulator and a conductorless/nonconductor material are not considered conductors. What is the definition of “dielectric?” An insulator that is able to be polarized using an applied electric field. A dielectric placed in an electrical field does not allow electric charges to flow continuously through it like they would in a conductor. Instead, the average equilibrium positions of electric charges shift slightly, causing dielectricpolarization. What are the terms “conductorless transmission medium” and “non-conductor transmit medium?”? A transmission medium that is made up of any material or combination of materials, but does not have a conductor between the sending device and the receiving device along the conductorless transmit medium or non-conductor transmit medium.
Guided electromagnetic waves are not restricted to free space propagation, such as unguided or unbounded wireless signals. Their intensity decreases in proportion to the distance traveled. However, guided electromagnetic wave propagation can occur along a transmission medium with a lower loss of magnitude per unit distance than unguided electromagnetic radiation.
The guided electromagnetic waves, unlike electrical signals can travel along different transmission media between a sending device and a receiving device. This is without the need for a separate return path. Guided electromagnetic waves can propagate along different types of transmission media from a device that sends them to the device that receives them. This includes a medium without conductive components, such as a dielectric rod or strip, or one with only a single conductor, like a bare wire, or an insulated wire, configured in an electrical open circuit. “Even if the transmission medium contains one or multiple conductive elements and the guided waves propagating through the medium generate currents flowing in the conductive elements in the direction of the waves, the guided waves can propagate from a device to another device along the medium without the need for opposing currents in an electrical return circuit between the device and receiver (i.e. in an open electrical circuit configuration).
As an example, let’s consider electrical systems which transmit and receive signals via conductive media between devices. These systems rely on a forward electrical path and a return electrical path. Consider, for example, a coaxial cord that has a center conductor separated from a ground shield by an insulator. In an electrical system, a sending device (or receiver) can connect a first terminal to the center conductor and a second to the ground or another second conductor. The sending device can inject an electrical signal into the center conducting via the first terminal. This electrical signal will propagate down the center conducting causing forward and return currents. “The same conditions apply to a two-terminal receiving device.
Consider, however, a guided wave communications system, such as the one described in this disclosure, that can use different types of transmission mediums (including a coaxial cable among others) to transmit and receive guided electromagnetic waves without an electrical return path. One embodiment of the subject disclosure allows for guided electromagnetic waves to propagate along the outer surface of a coaxial cables. The guided electromagnetic wave can create forward currents on ground shield but the guided waves don’t require return currents, such as on the center conductor, to allow the guided magnetic waves to propagate along coaxial cable’s outer surface. This is true for all other transmission media that are used in a guided wave communication network to transmit and receive guided electromagnetic waves. Guided electromagnetic waves can be induced by the guided-wave communication system on a wire, an insulated, or dielectric transmission medium. They can propagate along the wire, the insulated, or dielectric transmission medium, without the need for return currents.
Therefore, guided wave systems are different from electrical systems which require a return path for the electrical currents in order to propagate the electromagnetic waves. The transmission medium can also be configured to simultaneously propagate electromagnetic waves using an electrical return path, such as ground, for the purpose of conducting currents. The propagation of electromagnetic waves does not depend on the flow of electrical currents through the transmission medium. If, for example, the electrical currents that flow through the transmission medium cease to flow (e.g. a power failure), electromagnetic waves can continue propagating without interruption.
It is noted that in the subject disclosure, guided electromagnetic waves can have an electromagnetic structure that is primarily or substantially located on the outer surface a transmission media so that they are bound or guided by this outer surface and that they propagate non trivial distances along or on the outer edge of the medium. In other embodiments of guided electromagnetic waves, the electromagnetic field structure can be substantially above the outer surface of the transmission medium. However, the transmission medium is still bound or guided and the guided electromagnetic wave will propagate non-trivial lengths along or on the transmission medium. In other embodiments of guided electromagnetic waves, the electromagnetic field structure can have a de minimis field strength at the outer or below the surface and/or near the surface of the transmission medium. However, the field is still bound to or guided to the transmission media and propagates non-trivial lengths along it. In other embodiments of guided electromagnetic waves, the electromagnetic field structure can lie primarily or substantially beneath the outer surface of a medium of transmission so that it is bound to or guided a dielectric inner material and to propagate non trivial distances in the inner material. In other embodiments of guided electromagnetic waves, the electromagnetic field structure can be located in a region partially below and partly above the outer surface of the medium to allow the waves to be guided or bound by the region. You will appreciate that electromagnetic waves (guided electromagnetic waves) that propagate or are guided by a medium can have an electrical field structure as described in any of the embodiments above. The desired electromagnetic field structure in an embodiment may vary based upon a variety of factors, including the desired transmission distance, the characteristics of the transmission medium itself, environmental conditions/characteristics outside of the transmission medium (e.g., presence of rain, fog, atmospheric conditions, etc. The desired electromagnetic field structure in an embodiment may vary based on a variety of factors, including the desired transmission distance, the characteristics of the transmission medium itself, environmental conditions/characteristics outside of that medium (e.g. presence or fog, atmospheric conditions, etc.).
Various embodiments of the present invention relate to coupling device that can be referred as ‘waveguide couplings devices? or ‘waveguide couplers. Or, more simply, as “couplers” or “coupling devices?” or ?launchers? For launching or receiving/extracting directed electromagnetic waves from and to a transmission medium. The wavelength can be small in comparison to the dimensions of the coupling devices and/or transmission mediums such as the circumference or cross sectional size of a wire. These electromagnetic waves may operate at millimeter-wave frequencies (30 to 300 GHz) or at lower microwave frequencies, such as 300MHz to 30GHz. A coupling device can induce electromagnetic waves to propagate on a transmission medium, including: a stripe, arc, or another length of dielectric; a millimeter-wave integrated circuit (MMIC); a horn or dipole; a slot or patch; or an array of other antennas. The coupling device receives electromagnetic waves from a transmission medium or transmitter. The electromagnetic field structure can be carried beneath an outer surface, on the outer surface, in a hollow cavity, or from the coupling. When the coupling is close to a transmission media, at least part of the electromagnetic wave is coupled to or bound to it, and then continues to propagate along the medium as guided electromagnetic waves. A coupling device is able to receive or extract a portion (or all) of guided electromagnetic waves and transmit them from the transmission medium. The coupling device can launch and/or receive guided electromagnetic waves from a device that sends the waves to a device that receives them. This is done without the need for an electrical return path. The transmission medium in this case acts as a waveguide for the propagation from the sending device towards the receiving device.
According to one example embodiment, surface waves are a guided wave type that is guided by the surface of a medium of transmission, such as a exterior or outer surface, an interior or internal surface, including an interstitial or interconnected surface, such as the area between the wires of a multi-stranded wire, insulated twisted pairs wires or wire bundles, and/or a different surface of the medium of transmission that is adjacent or exposed to a medium of transmission having a different property (e. In an example embodiment, the surface of a transmission medium that guides a wave surface can be a transitional layer between two types of media. In the case of an uninsulated or bare wire, for example, the surface can be the exterior or outer conductive surface that is exposed in air or space. In the case of an insulated wire, a surface can be formed by the conductive portion that meets the inner surface of its insulator. Surfaces of transmission media can include the inner surface of an insulation surface or the conductive surface that is separated from the insulator by, for instance, air or space. The surface of a medium of transmission can be any region that is made of material. The surface of a transmission medium, for example, can be the inner portion of an insulation disposed on the conductive portion that meets the insulator part of the wire. The surface that guides a guided electromagnetic wave depends on the relative differences (e.g. dielectric properties) between the insulator and air and/or conductor, as well as the frequency and mode of propagation of the guided wave.
According to one embodiment, the term “about” is used. a wire or other transmission medium used in conjunction with a guided wave can include fundamental guided wave propagation modes such as a guided wave having a circular or substantially circular field pattern/distribution, a symmetrical electromagnetic field pattern/distribution (e.g., electric field or magnetic field) or other fundamental mode pattern at least partially around a wire or other transmission medium. The guided electromagnetic waves can be bound to a medium and have electromagnetic fields that surround or circumscribe a non-planar area of the medium.
These non-circular field distributions may be unilateral or multilateral, with one or two axial lobes that have a relatively high field strength and/or one/more null directions of zero field strength/substantially zero-field strengths, or null regions that are characterized as relatively low-field strength/zero-field strength. According to one example embodiment, the field distribution may also vary depending on azimuthal orientation around a transmission media. This means that one or more angular areas around the transmission medium can have an electric field strength or magnetic field strength (or combination thereof), that is greater than one or two other regions of azimuthal alignment. As the guided waves travel along the wire, it will be apparent that the relative positions or orientations of higher order modes can change, especially if they are asymmetrical.
In addition, a guided wave propagates?about? A guided wave can propagate along a wire or any other type of transmission medium. This includes the fundamental wave propagation modes (e.g. zero order modes), as well as non-fundamental modes like higher-order guided waves modes (e.g. 1st or 2nd order modes). Higher-order modes can include symmetrical modes with a circular or substantially circular electric field distribution and/or an symmetrical electric field distribution. Asymmetrical modes, and/or other guided waves (e.g. surface), may also have non-circular or asymmetrical field distributions around wires or other transmission media. The subject disclosure’s guided electromagnetic waves can travel along a transmission medium, from the sending device to a receiving device, or along a coupling apparatus via one or more of the following modes: a fundamental transverse magnet (TM) TM00 (or Goubau) mode or fundamental hybrid mode (EH/HE)?EH00? mode or?HE00 Mode, a transverse electromagnetic?TEMnm? Mode, a transverse electromagnetic?TEMnm?
Guided wave mode” is the term used herein. Refers to a guided propagation mode of a transmission media, coupling devices, or other system components of a guided-wave communication system that propagates for nontrivial distances along its length.
The term’millimeter-wave’ as used herein refers to electromagnetic waves/signals that fall within the?millimeter wave frequency band. Can refer to electromagnetic waves/signals falling within the?millimeter wave frequency band? between 30 GHz and 300 GHz. Microwave is a term that refers to electromagnetic waves/signals. Microwaves can be used to refer to electromagnetic signals/signals falling within a “microwave frequency band”. From 300 MHz up to 300 GHz. The term “radio frequency” is used. The term?radio frequency? oder?RF? can be used to refer to electromagnetic waves/signals that fall within the?radio frequency band. The term?RF? can be used to refer to electromagnetic signals/waves that fall within the ‘radio frequency band? between 10 kHz and 1 THz. Wireless signals, electrical signals and guided electromagnetic waves, as described in this disclosure, can operate at any frequency, including frequencies within the millimeter-wave or microwave frequency bands. When a transmission medium or coupling device includes a conductor element, the frequency at which guided electromagnetic waves are propagated along the transmission medium and/or carried by it can be lower than the mean collision frequency for the electrons within the conductive elements. The frequency of the guided electromagnetic wave that is carried by the coupling devices and/or propagate through the transmission medium may be non-optical, e.g. a radio frequency that falls below the range of optical frequencies which begins at 1 THz.
It is also appreciated that a transmission media described in the subject disclosure may be configured to be opaque, or at least substantially reduce, propagation of electromagnetic wave operating at optical frequencies (e.g. greater than 1 THz).Click here to view the patent on Google Patents.