Coupling device, surface wave coupling method and open wire surface wave wireless coverage system

A coupling device, comprising:

• a mode matching module configured to convert a sixth electromagnetic wave propagating in a target guided wave mode into a seventh electromagnetic wave propagating in a preset low-order guided wave mode;
• a mode converting and filtering module configured to convert the seventh electromagnetic wave into an eighth electromagnetic wave propagating in a superposition of a plurality of guided wave modes comprising a preset high-order guided wave mode, and filter the high-order guided wave mode reflected to the mode matching module;
• and
• a high-order mode direct coupling module configured to couple a component in the eighth electromagnetic wave propagating in the preset high-order guided wave mode to a waveguide connected to a receiver.

An open wire surface wave wireless coverage system, comprising at least one micro base station and a plurality of coupling devices, the micro base station being connected to at least one of the coupling devices through a waveguide,

• wherein, each of the plurality of coupling devices comprises:
• a high-order mode direct coupling module configured to couple a first electromagnetic wave from a transmitter to form a second electromagnetic wave propagating in a preset high-order guided wave mode;
• a mode converting and filtering module configured to convert the second electromagnetic wave into a third electromagnetic wave propagating in a superposition of a plurality of guided wave modes comprising a preset low-order guided wave mode and at least one high-order guided wave mode, and filter the high-order guided wave mode in the third electromagnetic wave to obtain a fourth electromagnetic wave propagating in the preset low-order guided wave mode;
• and
• a mode matching module configured to convert the fourth electromagnetic wave into a fifth electromagnetic wave propagating along a surface of an open wire in a target guided wave mode,
• wherein,
• the micro base station is configured to send an electromagnetic wave carrying information to the coupling device connected to the micro base station through a waveguide, and obtain an electromagnetic wave carrying information from the coupling device connected to the micro base station;
• and
• the coupling device is configured to couple the electromagnetic wave carrying information sent by the micro base station connected to the coupling device, to the open wire to propagate along a surface of the open wire in a target guided wave mode, and couple the electromagnetic wave carrying information propagating along the surface of the open wire to the micro base station connected to the coupling device.