Feed horn

About: Feed horn is a research topic. Over the lifetime, 2395 publications have been published within this topic receiving 26548 citations. The topic is also known as: feedhorn.

Ka band 3D printed horn antennas

Abstract: This paper presents pyramidal horn antennas operating at 28 GHz, which are manufactured by 3D printing technology. A printed antenna based on a WR-28 waveguide standard gain horn designed for 20 dBi gain is then metalized using two different methods. Copper tape and conductive copper paint are applied to the 3D printed geometry surface. A full-wave electromagnetic simulator, HFSS, is used to design the horns and predict the gain. Through simulation, we observe that dielectric loss impacts the copper tape metallized structure. The measured input reflection coefficient for the 20 dBi horns is presented along with the simulated radiation pattern. The dielectric and metallic loss impact the overall radiation patterns of the antennas. Measured gain for an X band horn is compared with a reference.

Terahertz High-Gain Offset Reflector Antennas Using SiC and CFRP Material

Abstract: Two high-gain terahertz (THz) offset reflector antennas are proposed. The silicon carbide material and thermally stable carbon fiber-reinforced plastic are selected as reflectors for high specific stiffness and low thermal expansion coefficient which are helpful for space use. Dual polarization is achieved by introducing a wire-grid polarizer which can separate the two THz polarization waves provided by multimode horns fabricated in electroforming technology. Furthermore, three-coordinate test system and theodolites are employed to detect the surface error of dishes and alignment of antenna subsystem. The physical optics analysis based on the measured reflector surface data is introduced referring to the large aperture antenna patterns by virtue of its accuracy and high efficiency. The results of this novel method are compared to that of the near-field test. Measurements show that the sidelobe levels (SLLs) of the single polarization silicon-based reflector are below −32 dB while the gain is 55.3 dB at 330 GHz, and the dual polarization carbon fiber-reinforced plastic reflector antenna suppresses the SLLs to −28 and −29 dB in two principal planes while the gain is 57.2 dB at the same frequency, respectively. The good performances of the proposed antennas indicate the potential for the application of space THz radiometer.

A 20-dB quasi-integrated horn antenna

Abstract: A multimode quasi-integrated dipole-fed horn antenna is presented with a performance comparable to that of waveguide-fed corrugated horn antennas. The antenna has been designed using full wave analysis and has been fabricated and tested at 91 GHz. The horn has a gain of 20 dB with very symmetric patterns, a Gaussian coupling efficiency of 97%, and a cross-polarization level of -22.7 dB. The antenna provides a significant improvement in integrated antenna designs and is suitable for millimeter-wave communication and radar systems and as a Gaussian-beam launcher in quasi-optical receiver systems. >

Transient Fields of Parabolic Reflector Antennas

Abstract: Requirements to increase the information content of radar and communication systems result in a band width increase and are a reason to investigate and describe the transient fields from ultra wideband (UWB) large antennas1. Furthermore, a need in such an analysis occurs in near field time domain antenna measurements2. In these cases not only the transient far field is of interest. The spatial-temporal near-field distribution is useful too to the optimal antenna arrangement on the complex objects. Mention must be made that many issues of the theory of an impulse radiating antenna. (IRA) are discussed by Carl E. Baum. Everett G. Fart and D. V. Giri3–8. The transient field from the circular focused aperture with uniform held distributions was considered in3. Much attention is given to IRA which consists of a large angle conical TEM feed that attach to a reflector antenna. It was shown that radiated held includes three distinct pacts. The first of these is the direct radiation from the feed structure (prepulse), whirl is of rather low magnitude, but lasts for a fairly long time This is followed by an impulse, which lasts for a brief time and is high in amplitude. Finally, there is a tail expected after the impulse. Closed-form expressions for prepulse were presented in 4. Analysis was extended to include the diffracted fields from the launcher plates and the circular rim of the reflector5. It was shown that there is an exact time-domain match of the spherical and planar TEM waves (inhomogeneous) at the reflector4–7. Thu exact expressions for the acoustic fields on the z axis for a circular aperture were obtained in 8. While the above-mentioned works describe basic properties of transient fields of an IRA, many questions are yet to be investigated.

Device and method for determining the distance and/or orientation of a moveable object

Abstract: A device and method for determining a distance and/or orientation of a movable object includes a transmitter that is located on the object and a receiver One of the transmitter and the receiver has an antenna having a known polarization plane The other of the transmitter and the receiver has a counterclockwise circular polarized antenna and a clockwise circular polarized antenna