An electromagnetic wave radiator may consist of a base layer made of metal, with a variety of metal side walls that protrude from the edges of the first layer and a secondary layer suspended above the first layer. The second layer of metal includes a plurality ports radiating out from the edges of the second layer, and a plurality slots that penetrate the second layer in a circular manner.

1. Field

The present disclosure relates to an electromagnetic wave radiator, and more particularly, to an electromagnetic wave radiator radiating a circularly-polarized millimeter-wave/terahertz (THz)-wave.

2. Description of Related Art

Millimeter waves are electromagnetic wave that has a wavelength of 1-10 millimeters. Its frequency ranges between 30 and 300 GHz. The millimeter-wave is used in a variety of fields, including the military and automobile radars,satellite communications, and radio navigation. It is anticipated to be used for large-capacity voice, image, and data transmission in the next generation 5G ultra-wideband wireless communication network. A terahertz (THz)-wave is an electromagnetic wave with an average frequency of 0.3 to 3 THz. It is used for security and medical purposes. It is anticipated to be used extensively in the future.

There are a variety of devices being developed to effectively transmit and receive millimeter-waves as well as THz-waves. For example, a millimeter-wave/THz-wave microstrip patch antenna has a large area and a low quality factor (Q-factor).In order to improve this issue, devices such as a multi-port driven antenna, a slot-ring traveling-wave radiator, and a multi-port driven antenna having a radiator core are proposed for the millimeter-wave/THz-wave. However, these antennas don’t have enough Q-factors to provide high-quality.

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