Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-01-10
Astrophys.J.Suppl. 143 (2002) 567
Astronomy and Astrophysics
Astrophysics
9 pages with 7 figures, of which 2 are in low-resolution versions; paper is available with higher quality figures at http://
Scientific paper
10.1086/342833
We present the design, manufacturing methods, and characterization of 20 microwave feed horns currently in use on the Microwave Anisotropy Probe (MAP) satellite. The nature of the cosmic microwave background (CMB) anisotropy requires a detailed understanding of the properties of every optical component of a microwave telescope. In particular, the properties of the feeds must be known so that the forward gain and sidelobe response of the telescope can be modeled and so that potential systematic effects may be computed. MAP requires low emissivity, azimuthally symmetric, low-sidelobe feeds in five microwave bands (K, Ka, Q, V, and W) that fit within a constrained geometry. The beam pattern of each feed is modeled and compared with measurements; the agreement is generally excellent to the -60 dB level (80 degrees from the beam peak). This agreement verifies the beam-predicting software and the manufacturing process. The feeds also affect the properties and modeling of the microwave receivers. To this end, we show that the reflection from the feeds is less than -25 dB over most of each band and that their emissivity is acceptable. The feeds meet their multiple requirements.
Barnes Chris
Bennett Casey
Bradley Sean
Halpern Mark
Hinshaw Gary
No associations
LandOfFree
The MAP Satellite Feed Horns does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The MAP Satellite Feed Horns, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The MAP Satellite Feed Horns will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-230736