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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).

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What are the parameters of the Voyager high-gain antenna?

The Voyager spacecraft have a 3.66 m diameter parabolic high-gain antenna. I've had a nose around NASA's archives but I can't find the exact geometry of the parabola; specifically the distance from ...
Dave Gremlin's user avatar
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4 votes
1 answer
282 views

Starlink Dishy parameters and satellite recognition

I have two questions: What are the antenna parameters of Starlink dish antennas (like antenna gain, directivity, etc)? Is there any way for me to know which satellite my Starlink dish is ...
babibooooooo's user avatar
3 votes
0 answers
102 views

Have spherical dish antennae been used with Molniya satellites to avoid switch-over signal loss?

Molniya-orbit communication satellites work well for ground stations near the poles. These high eccentricity, highly inclined orbits, with a period of 12 hours, “loiter” for about 6 hours over the ...
Woody's user avatar
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4 votes
1 answer
181 views

Geo satellite - antenna gain contours to heat map in STK

I am using STK to show antenna gain contours on the ground from a transmitter on a sensor on a geo bird that is tracking a receiver on the ground. With good resolution I can create great images that ...
rebee's user avatar
  • 41
2 votes
0 answers
44 views

Add small extra gps antenna on tracker installed inside aluminum tube [closed]

I would like to install a GPS tracker inside a scooter. Will the GPS signal will be lost if I install the tracker inside the vehicle? Can I add a small extra antenna to fix outside the scooter?
Marc D's user avatar
  • 21
3 votes
1 answer
69 views

TLE along track error to miss a contact opportunity in UHF

Update: (following @GregMiller's comment): Lets suppose a spacecraft has performed a boost and not all ground stations received the update, lets suppose the difference between the pre and post ...
patowski1981's user avatar
4 votes
0 answers
339 views

Polarization mismatch between a LEO satellite and ground terminal

Cross-polarization loss between a circularly polarized antenna and vertical or horizontal polarized antenna is known to be -3dB. This is one of the reasons why Circular Polarized antennas are ...
jkt's user avatar
  • 153
2 votes
1 answer
84 views

Antenna wrap material suitable for lunar & cis-lunar environment

I am looking for a wrap (station) antenna for a transceiver (in space/lunar) Not all materials are suitable for the space environment. Does anyone know what wrap antenna materials I can use? I have ...
Anna Koroleva's user avatar
0 votes
1 answer
277 views

Has there ever been a dish antenna on a lander? If so, which was the first? How about rovers?

At about 04:49 in Scott Manley's January 30, 2022 video Deep Space Radiation, Black Holes And Other Questions - Episode 14 a painting by the science fiction and ...
uhoh's user avatar
  • 149k
3 votes
0 answers
206 views

Why does this "satellite antenna at the Laguna Peak Tracking and Injection Facility" look so weird? (two dishes back-to-back)

The video 1967 Navy Satellite Navigation training film (IBM 7094 data center) after 11:57 (older version here) the narrator says: For every pound of satellite in ...
uhoh's user avatar
  • 149k
3 votes
0 answers
150 views

Are LHCP L-Band antennas for Cubesats available?

I am designing a cubesat to carry out GNSS reflectometry or GNSS-R. To collect the earth reflected signals, I need a nadir pointing array of patch antennas, with Left Hand Circular Polarisation (LHCP) ...
Luke O's user avatar
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2 votes
1 answer
172 views

What antennas does JAXA use to communicate with its deep space spacecraft? Does it have a deep space network of its own?

@BrendanLuke's answer to Are there currently any spacecraft in orbit around Venus that might (or might not) be at risk of meteoric dust from comet Leonard C/2021 A? alludes to the exciting story of ...
uhoh's user avatar
  • 149k
3 votes
1 answer
384 views

Which S-Band ISS antenna stopped transmitting to TDRS and was replaced during the recent 2021-12-02 EVA?

CNN's says: Marshburn and Barron began their spacewalk at 6:15 a.m. ET, and it's expected to last for about six and a half hours. The team will replace a malfunctioning communications antenna. Live ...
uhoh's user avatar
  • 149k
1 vote
0 answers
52 views

Are there any selfies of Curiosity or Perseverance with their high gain antenna deployed and "looking up"?

The Curiosity and Perseverance rovers have high gain antenna arrays on a mechanical arm that can rise up and point towards Earth and communicate directly. Has the Curiosity rover ever communicated ...
uhoh's user avatar
  • 149k
1 vote
1 answer
624 views

How does a 22 dBi X-band "patch" antenna get so much gain and how well behaved is its high-gain radiation pattern?

@NgPh's answer to How will the LICIACube cubesat transmit DART impact images back to Earth? What kind of antenna and radio will it use? quotes LICIACube on DART mission: an asteroid impact captured by ...
uhoh's user avatar
  • 149k
3 votes
2 answers
511 views

How will the LICIACube cubesat transmit DART impact images back to Earth? What kind of antenna and radio will it use?

MarCO The Mars Cube Ones or MarCOs were 6U cubesats that were deployed in deep space during the InSight mission to observe it during a critical, dynamic period of its mission, in this case the N ...
uhoh's user avatar
  • 149k
2 votes
0 answers
218 views

Field of view from Antenna

I am trying to calculate the revisit rate for my satellite constellation. My satellite hosts software-defined radios as its payload. Hence, I need to find the field of view from antenna. My S-band ...
geetha's user avatar
  • 251
2 votes
0 answers
52 views

Antenna for receivers

I am designing a CubeSat 6U in which I am using Software Defined Radio with SIGINT capability as my payload. The payload has 3 reception ports and 2 transmission ports and hence transceiver or ...
geetha's user avatar
  • 251
12 votes
1 answer
3k views

Why do Teledesic satellites look so weird? What are these structures and where's the satellite bus?

source enlarged and sharpened To my untrained eye I see a weird claw or flower-like antenna array with eight petals in the shape reminiscent of concave dish but not really, that look like they might ...
uhoh's user avatar
  • 149k
4 votes
1 answer
206 views

How did Sputnik 1's antennas couple to its body, electrically and mechanically?

Looking at https://www.britannica.com/technology/satellite-communication/Development-of-satellite-communication I found the image of a model of Sputnik 1 below. It shows details of its four rod ...
uhoh's user avatar
  • 149k
2 votes
1 answer
204 views

Following KRT-10 aboard Salyut-6, have there been any other radio astronomy observations from a space station or crewed capsule?

Space stations have certainly been equipped with infrared, visible, ultraviolet and X-ray telescopes for astronomical observation and optical and X-ray communications as well as particle telescopes ...
uhoh's user avatar
  • 149k
1 vote
1 answer
123 views

How were Soviet/Russian aircraft used to track and/or communicate with spacecraft?

Russian Space Web's Russian ground control and tracking network mentions A Soviet Iluyshin-18 aircraft configured to maintain communications with spacecraft. in the sidebar and includes the small ...
uhoh's user avatar
  • 149k
7 votes
1 answer
233 views

Why are modern satellite ground station and deep space communications dishes with secondary mirrors almost always Cassegrain?

The simplest dish antennas have a concave reflector and their feed horns at the primary focus which is "up in the air". That has several inconveniences, it's hard to go up there to do any ...
uhoh's user avatar
  • 149k
1 vote
1 answer
102 views

How does Quantum change it's antenna's shape? (Flagship UK telecommunications satellite just launched)

The BBC's Quantum: Flagship UK telecommunications satellite launches includes the following: A quarter of the world's big telecoms spacecraft are manufactured in Britain, and the new Quantum platform ...
uhoh's user avatar
  • 149k
9 votes
2 answers
1k views

What is the pop-up circular disk with spiral pattern in this NASA animation of the Dragonfly helicopter for Titan? Antenna? Kind, band, target?

At 00:36 in the June 2019 NASA video Dragonfly: NASA's New Mission to Explore Saturn's Moon Titan the animation shows it landing then deploying a circular disk with ...
uhoh's user avatar
  • 149k
0 votes
0 answers
50 views

Transmission and Receiving Rate of a X-Band Antenna

What would be a typical transmission and reception rate range for a X-Band Low Gain Antenna for say 300Km from an orbiter? I figured a High Gain Antenna would be difficult to use since it requires ...
Jose De La Pena's user avatar
3 votes
1 answer
993 views

How would I determine the power usage for a X-Band High Gain Antenna?

Currently I have that for a X-Band High Gain Antenna functioning at 8 Ghz, diameter of 3 meters, and a power transmission of 13.1dBW (20 watts) at a distance of about 8.5 AU has a Gain of 52.44 dBi, ...
Jose De La Pena's user avatar
3 votes
1 answer
144 views

When the Mars 2020 and Mars Science Laboratory missions were in deep space, what antennas did they have available to communicate with Earth?

This thorough answer to Did the Curiosity and Perseverance rover brains do the driving from Earth to Mars? explains that during deep space flight the rovers' computers were doing most of the thinking ...
uhoh's user avatar
  • 149k
3 votes
0 answers
96 views

Was Dart antenna tested using a DSN antenna located in Australia?

So recently a tweet by a bot which tracks communications by the Deep Space Network stated that: DSS 43 receiving data from Double Asteroid Redirection Test at 312.5kb/s. IN LOCK IN LOCK 1 TURBO 11:11 ...
Barry Jenakuns's user avatar
3 votes
1 answer
3k views

Why do AST SpaceMobile satellites have antennas much larger than Starlink, whereas they both aim at providing network coverage anywhere on earth?

I read on cnbc.com (mirror): AST drew the attention of NASA in October, when the U.S. space agency commented on the company’s FCC proposal and said AST’s “extremely large satellites” would create “an ...
Franck Dernoncourt's user avatar
3 votes
1 answer
303 views

What is a Beam Waveguide dish and why do deep space communications stations use them?

NASA Spaceflight.com's Deep Space Network upgrades and new antennas increase vital communication capabilities says: NASA’s Deep Space Network, commonly referred to as the DSN, has welcomed a new dish,...
uhoh's user avatar
  • 149k
3 votes
0 answers
87 views

What are the electrical requirements of the antennas used in Starlink?

My interest is in both the antenna for the ground segment (the "UFO on a stick") and the antennas for the space segment (phased arrays if I'm not mistaken). I couldn't find around much more ...
Paolo Squadrito's user avatar
6 votes
3 answers
544 views

What are the most common practical design specifications for antenna in space?

I'm writing my thesis on antennas for small satellite applications (cubesats). Apart from the electrical specifications related to the particular application there are also several other "...
Paolo Squadrito's user avatar
4 votes
3 answers
518 views

Has a probe ever been lost due to folding its antenna, making it unable to communicate?

I remember hearing the story of a probe on the surface of a planet (maybe Venus) that was lost due to an incredible design flaw, and I'm looking for more details. The probe had a dish antenna, and ...
Fabio says Reinstate Monica's user avatar
1 vote
1 answer
110 views

What radio signals have NASA transmitted to outside our solar system?

What radio signal have NASA transmitted to outside our solar system and what did they contain?
user avatar
0 votes
0 answers
61 views

Antenna required to reach titan

There are two 12U cubesats, one in Earth orbit and one in orbit around Titan. They have a transmit power of 700 W (for short periods) and have identical antennas. What diameter and what type of ...
Valentino Zaffrani's user avatar
3 votes
1 answer
245 views

Exchange diameter for power in parabolic antenna

If I want to reduce the diameter of a satellite dish, how much power should I add to the transmitter? how is this formula? As I have already been informed a little in this other question I asked: X-...
Valentino Zaffrani's user avatar
4 votes
1 answer
179 views

Alternatives to the X-Band

is there any other band that can do something similar to what the x-band does? Any that require a smaller antenna and more electrical power?
Valentino Zaffrani's user avatar
1 vote
2 answers
197 views

X-Band range and data

In summary I am working on a network consisting of 8 cubesat 1U that will be at an orbit altitude of 850Km. The question is that I am working on communications, the idea is that this network of ...
Valentino Zaffrani's user avatar
5 votes
2 answers
477 views

How do I calculate what antenna I need for my cubesat?

If I want to make a communication satellite, like MarCO, what formulas do I need to calculate the perfect antenna? Is there a difference between the X-Band and the classic UHF? If the cubesat is ...
Valentino Zaffrani's user avatar
1 vote
1 answer
142 views

General overview of how deep space communications performed

What frequency bands and general classes of antennas are used to communicate with deep space spacecraft? As an example, if we place a cubesat in orbit around Io, what would the antenna need to be ...
Valentino Zaffrani's user avatar
2 votes
3 answers
2k views

How do OneWeb satellites' antennas work?

The images below are of actual OneWeb satellites or models. There are two disk-like appendages and an array of linear gizmos which may be an array antenna. Is it possible to explain how these two ...
uhoh's user avatar
  • 149k
3 votes
1 answer
280 views

How does this large, flat antenna made from overlapping circles at Australia's Carnarvon Space Tracking Center work?

@Fred's comment links to the Australian Broadcasting Corporation's How the Apollo 11 Moon landing was achieved with the vital help of Carnarvon Tracking Station which links to their Carnarvon space ...
uhoh's user avatar
  • 149k
5 votes
1 answer
260 views

Help understanding how these components of a Honeysuckle Creek dish antenna work

@Fred's comment links to the Curious Droid video How Australia Helped Save Apollo 13 and a little after 02:15 and 03:00 it shows ...
uhoh's user avatar
  • 149k
3 votes
2 answers
382 views

How exactly were the signals from quad dishes of Apollo Deep Space High-Gain Antenna or Russian B-529 processed for local control of tracking?

The images below (and their sources) show the quad dishes of the Apollo Deep Space High-Gain Antenna and the Russian B529 ground station tracking antenna. From NASA Technical Note TN D-6723 Apollo ...
uhoh's user avatar
  • 149k
3 votes
3 answers
202 views

Which deep space spacecraft had main dish antennas that were perforated or made from mesh?

A long time ago I was considering asking why the dish antennas on some deep-space probes were perforated metal or mesh (presumably to save weight), while others were solid. I'm trying to finally ...
uhoh's user avatar
  • 149k
10 votes
2 answers
2k views

What antenna is this in an Apollo 15 LM photo?

The video Apollo 15 landing from PDI to Touchdown (found in Why did the Apollo 15 LM violently shake & raise dust after the contact probes touched the lunar surface?) seems to pan across a still ...
uhoh's user avatar
  • 149k
1 vote
1 answer
133 views

How did Luna 3's pivoting antennas and ribbon antennas work?

This comment below this answer to How was it possible for the Apollo 11 to film and take pictures with such radiation? links to the svengrahn.pp.se post Luna 3 - the first view of the moon's far side. ...
uhoh's user avatar
  • 149k
4 votes
1 answer
1k views

How were the 100+ antennas around Telstar 1 and 2 configured?

Telstar 1 and 2 demonstrated routing of telephone, television and other communications types between continents. The Smithsonian Air and Space Museum pages below contain images of the satellites. ...
uhoh's user avatar
  • 149k
18 votes
3 answers
3k views

How do these cubesats' whip antennas work?

This answer has identified the three 1U cubesats shown in the question, and links to Engineers Rule's Maya-1: The Philippines’ First CubeSat along with the video Animation of MAYA-1, The Philippines' ...
uhoh's user avatar
  • 149k