Questions tagged [antenna]

Questions about devices which collect and couple electromagnetic signals (communications, radar or other electromagnetic measurements) directly between free space, and conductors (e.g. waveguides or other transmission lines).

9 questions with no upvoted or accepted answers
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When did deep-space probes start getting wrapped in germanium-coated film?

The NASA video Juno Engineering: Precision Matters shows the Juno spacecraft on what look like it might be a spin balance table after about 02:50 and there one can ...
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99 views

How would the antenna on a spacecraft in GEO be provided an electrical ground?

I would like to understand better what specifications or guidelines address the electrical grounding/Earthing a parabolic reflector Antenna in GEO to minimize the potential difference with respect to ...
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63 views

What is the Telescope Invariant Point?

I am working on an implementation of an SLR tool. At some points of the documentation of the CRD format the term telescope invariant point shows up. Apparently it's a point on an ILRS antenna system. ...
2
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93 views

Why do these satellite antennas look so weird? (strangely shaped with little white dots…)

The NASA Spaceflight article Arianespace press onward with dual-passenger Ariane 5 launch shows a photo of Intelsat 39 during testing. The dish reflectors are strangely shaped: rather than being ...
2
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0answers
49 views

How video projection screen is used in test of Europa Clipper's high gain antenna?

Phys.org's Europa Clipper high-gain antenna undergoes testing says: The full-scale prototype antenna, which at 10 feet (3 meters) tall is the same height as a standard basketball hoop, is in the ...
2
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50 views

Was there a prototype for Solar Probe's hybrid Heat Shield/Antenna?

An early concept of the Solar Probe (reborn as Solar Probe Plus then Parker Solar Probe) used a parabolic antenna with a heat-resistant nadir facing side to double as a heat shield. While sourcing ...
2
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0answers
173 views

Did any of Voyagers' receivers' front ends take advantage of the “cold of space” to lower noise?

Most of the Voyagers' electronics are kept warm by electrical heaters powered by their RTG's, and presumably protected by some amount of insulation from the "cold of space" which means loss of heat ...
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29 views

Relation between beamwidths of E-plane and H-plane

Is there any relation between E-plane and H-plane beamwidths of an antenna when steering in azimuth and elevation directions?
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47 views

Are Hayabusa-2's high gain antenna disks electrically point-able?

Writing this answer I realized that Hayabusa-2 has two very similar looking circular flat disks that serve as it's high gain antennas. One is dedicated to X-band (7-8 GHz) and the other to Ka-band (32 ...