Receiving and transmitting coaxial Cassegrain antenna for terahertz real aperture imaging

Abstract

The invention discloses a transceiving coaxial Cassegrain antenna for terahertz real aperture imaging. The transceiving coaxial Cassegrain antenna comprises a main reflecting surface, an auxiliary reflecting surface, a transmitting feed source and a receiving array element feed source array, a first opening is formed in the position where the symmetry axis of the main reflecting surface passes through, the main reflecting surface and the auxiliary reflecting surface are coaxial, the focus of the main reflecting surface coincides with one focus of the auxiliary reflecting surface, the receiving array element feed source array is located on the other side of the main reflecting surface, and a first distance is formed between the receiving array element feed source array and the first opening. The Cassegrain antenna has the receiving and transmitting integrated performance, that is, the same antenna can transmit and receive signals, the structure is compact, miniaturization manufacturing is easy, due to the fact that the antenna has the negative feed source forward extension, the problems of gain reduction and wave beam widening generated when the feed source is offset in focus can be solved, high gain and narrow main lobe width can be obtained, and the antenna can be widely applied to the field of antenna devices. And high-precision real-aperture imaging and other tasks can be realized. The invention is widely applied to the technical fields of antennas and active terahertz imaging.

Description

technical field [0001] The invention relates to the technical field of antennas, in particular to a Cassegrain antenna for terahertz real-aperture imaging with coaxial transmission and reception. Background technique [0002] The Cassegrain antenna, also known as the card antenna, is a double-reflector antenna, which can be equivalent to a parabolic antenna with a long focal length. The spatial attenuation of the transmitted signal of the Lun antenna is smaller than that of the parabolic antenna, so it can achieve higher efficiency than the parabolic antenna. Cassegrain antennas are compact and easy to manufacture. Cassegrain antennas can be used in microwave and terahertz waves (electromagnetic waves with frequencies in the range of 0.1-10THz and wavelengths between 0.03-3mm) communication, imaging, detection and other fields. [0003] Terahertz waves have the characteristics of short wavelength, narrow beam, and good penetration, and are easy to complete tasks such as hi...

AI Technical Summary

Problems solved by technology

When the existing Cassegrain antenna is applied with a single detector feed, it is easy to obtain satisfactory results, but when it is applied to processes such as real-aperture imaging, it is often necessary to use a receiving element feed array composed of multiple detectors. For some Cassegrain antennas, high gain, compact size, and narrow main lobe are almost contradictory. For example, when pursuing high gain, often only narrow main lobe can be obtained, and it is difficult to cover multi-detectors. Receiver element feed array

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