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.

Q-band single pixel receiver development for the ngVLA and NRC

Abstract: A single feed cryogenic Q-band (35 – 50 GHz) dual-linear polarization receiver is under development at the NRC, primarily to establish the antenna performance parameters of the Dish Verification Antenna 2 at its high-frequency limit and as a possible receiver system for the National Radio Astronomy Observatory’s Next Generation Very Large Array (ngVLA). The cryostat houses a corrugated feed horn cooled to 16 K with a wide opening half-angle of 55°. The linear orthomode transducer (OMT) was redesigned to incorporate noise injection couplers and the power dividing function thus reducing the amount of components, connections, and thermal mass. The low noise (T LNA = 12 K) amplifier (LNA) was also redesigned to replace coaxial ports with WR-22 waveguide ports. The specifications, receiver design, measured farfield feed horn beam patterns from a near-field planar scanner, simulated OMT results, and sub-20 K receiver noise analysis is presented, along with future plans for production and installation.

Off‐axis performance of shaped antennas at millimeter wavelengths

Abstract: Antennas which have been shaped for optimal aperture efficiency will not give sharp off-axis images. This is true for even quite small fields of view. The shaping to match feed horn illumination is at fault here; it leads inevitably to severe coma and curvature of the field. The analysis presented here is based upon geometrical optical computations.

Cancellation of High Cross-polarization of an Offset Parabolic Reflector Antenna using a Rectangular Matched Feed

Abstract: This paper presents the design and the experimental results of a dual-mode rectangular-matched feed. This type of feed cancels the unwanted high cross-polarization generated by the offset parabolic reflector antenna. In order to design this feed, higher order TE11 mode has been added in correct amplitude and phase with the fundamental TE01 mode in a rectangular structure. The proposed feed was then used as a primary feed to illuminate a linearly polarized offset parabolic reflector antenna. Through experimental results, it is verified that such a feed suppresses the undesired high cross-polarization introduced by the offset geometry of an offset reflector antenna. This kind of feed is very much suitable for monopulse tracking radar.

A dual offset shaped reflector for elliptical beams

Abstract: Presents the design techniques for dual offset shaped reflectors, with special emphasis on sidelobe and cross polar performance. The method is systematic and not based on ad hoc assumptions. The principles of the method are described, with an outline of the numerical solution technique included. A specific design of which a breadboard model has been manufactured, integrated and tested as part of an INTELSAT R&D study, is evaluated where the importance of choosing the right analysis method and as accurate input data as possible is demonstrated by comparing analysis and measurements. This provides the basis for using the same method in the design of the two Ku-band spot beam antennas, S1 and S2, on the INTELSAT VIII series spacecraft, which is currently being built by GE Astro Space, with DASA and TICRA as sub-contractors for the spot beam antennas.

Communication device with integration in separate transmitter and receiver antennas

Abstract: Integrated RF components in the radio frequency (RF) front end of a communication device. The RF front end includes an antenna function for converting between radiated and electronic signals, includes a filter function for limiting signals within operating frequency bands, an amplifier function for boosting signal power and a mixer function for shifting frequencies between RF and lower frequencies. The receive antenna function is separate from the transmit antenna function where two different integrated filters/antennas (filtennas) are employed, a filtenna for the receive path and a filtenna for the transmit path.