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.

Feed horns for reflector dishes

Abstract: A feed horn for a parabolic reflector includes a feed waveguide capable of supporting a first electromagnetic mode and a cylindrical member surrounding an open-ended radiating portion of said feed guide and located about said open end at a distance to cause a second mode to be supported. Said first and second modes as propagating combine to provide a radiation pattern for illuminating said reflector to provide a high performance antenna system.

Chip on Board 3–10-GHz Impulse Radio Ultra Wideband Transmitter With Optimized Die to Antenna Wire Bond Transition

Abstract: In this paper, a low power and low cost ultra wideband impulse radio transmitter is presented. The transmitter includes a pulse generator integrated in a 0.13- $\mu{\rm m}$ standard CMOS technology and an antenna printed on the chip carrier. The board is manufactured with Roger 4003 laminate substrate and has a total area of 50 mm $\times\,$ 18 mm. The transmitter provides 1.4 V peak to peak Federal Communications Commission compliant pulses at antenna input for data rates up to 36 Mb/s in an on–off keying modulation scheme. The transmitter's power consumption is 12 mW at 1.2-GHz pulse repetition frequency and the energy consumption is 10 pJ per pulse. A 365-mV peak voltage emitted pulse is measured in an anechoic room at 0.8 m range with a receiver, including a horn antenna (8.3 dBi), a LNA (32 dB), and a 12-GHz real time oscilloscope.

Cross-polar compensating feed horn and method of manufacture

Abstract: A feed horn with a horn body and a waveguide body, each with a front end and a back end, respectively. The horn body and the waveguide body coupled together, the waveguide body front end to the horn body back end. The waveguide body provided with a waveguide bore between the front end and the back end. At least one slot formed in the waveguide bore parallel to a longitudinal axis of the body bore, the at least one slot extending to the front end. The horn body provided with a horn bore between the front end and the back end. The horn body and the waveguide body formable via injection molding methods such as die casting.

Dual gridded reflector antenna

Abstract: An improved dual gridded reflector antenna configuration which allows cross-polarization radiation to be scanned in any given direction. The dual-gridded reflector assembly includes a front parabolic reflector illuminated by a first source, and a second parabolic reflector illuminated by a second source. The second reflector is positioned adjacent to and behind the front reflector such that the center points of the reflectors align to define a center axis. Additionally, the first and second sources are positioned at different offsets with respect to the reflectors and have a respective rotated offset angle with respect to the center axis such that the sources define an antenna feed separation. By modifying the offsets and the rotated offset angles, the feed separation can be designed to have an inclination with respect to the north-south or east-west feed separation direction.

Feed-reflector design for large adaptive reflector antenna (LAR)

Abstract: A novel feed-reflector system for large Cassegrain antennas of radio astronomy and deep-space communication applications is investigated. This feed-reflector is used to illuminate a hyperboloid subreflector with a 5-10 m diameter located 500 m above the ground. Because the subreflector is located in the near field of the feed-reflector antenna, a theory based on the near field focusing properties of paraboloid reflectors is established. The focusing at near distance is formed by moving the feed horn away from the focal point of the feed-reflector. In this theory, the properties of axial defocused paraboloid reflectors at near distance are investigated in more detail. By using equivalence path law, the subreflector shape is obtained. It is found that the hyperbola can approximate the subreflector well. A detailed ray tracing is performed on the entire system which reveals that the feed system uses some part of the subreflector three times. The gain, side lobe level, cross polarization, and aperture distribution are calculated for different feed horn locations and taper at the edge of the feed-reflector and also for different sizes and eccentricities of the subreflector. Peak efficiency in excess of 74.8% and side lobe level around -20 dB are obtained for an unshaped system. The performance of the system over the operating band (1-22 GHz) is also studied and shown that the lower-frequency limit is dependent on subreflector and feed-reflector sizes.