Design, Prototyping and Measurement of EVLA S-Band Feed Horn
نویسنده
چکیده
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 the edge of the subreflector (9.3o) is -13 dB and the cross-polarized sidelobes are below -28 dB.
منابع مشابه
Design and Analysis of Low Frequency Strut-Straddling Feed Arrays for EVLA Reflector Antennas
A new feed system is designed for the Expanded Very Large Array (EVLA) for operation below 100 MHz. The only existing system on the EVLA operating below 100 MHz is the “4 m” (74 MHz) system which uses crossed half-wave dipoles located in front of the Cassegrain subreflector as the feed. However, the dipole feeds of this system introduce blockage, and a reduction in system sensitivity (estimated...
متن کاملEVLA Memo 109 Wideband Performance of the EVLA L-Band System
The performance of the EVLA L-band feed/receiver across its full 1.0 – 2.0 GHz range is presented. The median efficiency across the band is near 45%, rising by about 4% near 1300 MHz and 2000 MHz, and dropping by a similar value near 1600 MHz. The efficiency drops quickly below 1100 MHz. The variation of focus position with frequency follows predicted values, and an optimum position for wide-ba...
متن کاملDesign of Broadband Circular Polarization Truncated Horn Antenna with Single Feed
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...
متن کاملDevelopment of an Enhanced Gain Substrate Integrated Waveguide H-plane Horn Antenna Using Thin Substarte
In this paper a dual band and high gain H-plane horn antenna implemented by substrate integrated waveguide (SIW) using a single layer thin substrate is introduced. The proposed antenna consists of five parts of rectangular waveguide with different width arranged in a staircase manner to allow mode combination of fundamental and higher propagating modes of the structure. By adjusting the length ...
متن کاملCircularly Polarized Circular Slot Antenna Array Using Sequentially Rotated Feed Network
This paper presents the design, simulation, and measurement of two low-cost broadband circularly polarized (CP) printed antennas: a single element and an array at C band. The proposed single element antenna is excited by an L-shaped strip with a tapered end, located along the circular-slot diagonal line in the back plane. From the array experimental results, the 3 dB axial ratio bandwidth can r...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2007