This paper presents the design of a broadband circular polarization truncated horn antenna with single feed. It does not require any complex feeding structure and uses only a coaxial feed extended with a simple electric field coupling probe. The corners of the horn are truncated to generate circular polarization modes, and a broad axial ratio bandwidth which is insensitive to the probe feed dim...

An axially corrugated horn antenna with an elliptically shaped taper is proposed for satellite communication applications. This structure is a good candidate for the feed of reflectors and also for improving the electrical properties of reflector antennas. A tapering method is used to justify the horizontal location of the corrugation profile which improves the electrical performance of the pre...

This paper presents the design of a tri-mode matched feed horn to remove the beam squinting effects in a circularly polarized offset parabolic reflector antenna. In a conical horn, three modes i.e., TE11, TM11 and TE21 are combined in proper amplitude and phase proportion to obtain a tri-mode matched feed configuration. The proposed tri-mode horn is then used as a primary feed device to illumin...

Abstract In this paper we discuss the design, manufacturing and characterization of feed horn array Strip instrument Large Scale Polarization Explorer (LSPE) experiment. is a microwave telescope, operating in Q- W-band, for observation polarized emissions from sky large fraction (about 37%) Northern hemisphere with sub-degree angular resolution. The focal plane populated by forty-nine Q-band si...

In mammals, somatosensory input activates feedback and feed-forward inhibitory circuits within the spinal cord dorsal horn to modulate sensory processing and thereby affecting sensory perception by the brain. Conventionally, feedback and feed-forward inhibitory activity evoked by somatosensory input to the dorsal horn is believed to be driven by glutamate, the principle excitatory neurotransmit...

We develop a simple model for a feed horn with a uniformly excited circular aperture at the focus of an offset paraboloidal reflector antenna and compare it with reflector antenna analyses using combinations of circular waveguide TE1n modes. The model demonstrates the deep dip that can occur at the spot-beam center for certain feed diameters and it is used in a design procedure that relates the...

In this paper the phase centre of a pure mode, smooth wall, conical horn is studied. The method employed uses phase information obtained by aperture integration of the phase corrected mode field but differs from earlier presentations in first reducing the radiation integrals in terms of an identified family of functions prior to integration. The result is formulas for the principal plane radiat...

A prototype of the S-band (2-4 GHz) feed horn for the EVLA was measured at the Outdoor Antenna Test Range (OATR) in Socorro in June 2007. In May 2006, a halfscale (C-band) version of this feed was measured at the same test range and was found to meet the design specifications. The S-band feed has an inside aperture diameter of 41.945” and a length of 129.75”. The average illumination taper at t...

Multi-chroic polarization sensitive detectors offer an avenue to increase both the spectral coverage and sensitivity of instruments optimized for observations of the cosmic-microwave background (CMB) or sub-mm sky. We report on an effort to adapt the Truce Collaboration horn coupled bolometric polarimeters for operation over octave bandwidth. Development is focused on detectors operating in bot...

Conclusion: It is possible to produce a very simple dual feed horn by cutting off a part of one side of a corrugated horn and fitting two of them together. A common ridge between both horns and, at least, one complete slot in each horn part is necessary to decouple them suficiently. The horn can be used for orthogonal polarisations with good cross-polar performance over a frequency band of abou...