Antenna and Satellite Trainers Lab Equipment Manufacturer, Supplier and Exporter in India

Antenna and Satellite Trainers

Pattern, gain, match

Pattern: the measurement that needs a rotating mount and a distance

A radiation pattern is the relative received signal as a function of angle, so the apparatus has to rotate the antenna under test in a controlled, readable way. That is what the motorised antenna unit (AST-0002) is for, and it is why a trainer with a motorised, angle-indicated mount is worth considerably more than one where the antenna is turned by hand against a protractor: the pattern is plotted from forty or more points, and hand rotation turns a two-hour experiment into a four-hour one with worse data.

The distance is a physical requirement, not a convenience. Close to an antenna the field is still forming and the angular distribution is not yet the pattern the antenna will produce at a distance; the pattern only becomes the pattern beyond a separation that grows with the antenna's size and shrinks with wavelength. The standard far-field criterion is a formula, and for a small teaching antenna at microwave frequencies it usually comes out at a readily achievable bench or room distance - but for a larger aperture or a lower frequency it may be further than the room allows, and no amount of care with the rotation will fix a measurement taken too close.

So two questions on an enquiry: what separation does the trainer require for the antennas supplied, and does the room you intend to use allow it? Tell us the room dimensions and we will tell you whether the configuration fits. We would rather have that conversation before the order than after a department has been given results that look wrong and are correctly measured in the wrong place.

The room is part of the measurement

An antenna pattern measured indoors is measured in the presence of every reflecting surface in the room: walls, benches, filing cabinets, the metal frame of the window, and the people watching. Those reflections arrive at the receiving antenna along with the direct signal and distort the pattern - typically filling in the nulls, which are the most informative part of it, and adding ripple to the main lobe.

What a teaching laboratory can do about it, in increasing order of cost:

• Clear the path and the area around it. Move metal objects away, keep the class behind the plane of the antennas, and do not stand between them.
• Keep the antennas away from the floor and walls, at a consistent height, on non-metallic supports.
• Repeat a measurement with something moved - a cabinet, a person. If the pattern changes, the room is in the measurement, and the students have just learned something more valuable than the pattern itself.
• Absorber panels behind and beside the path, which is the practical half-way house to an anechoic chamber. Ask us about panel options if pattern work is a significant part of the course.

Gain: measured by comparison, so you need a reference

Absolute gain measurement is a specialist procedure. In a teaching laboratory, gain is almost always measured by comparison against a reference antenna of known gain: substitute one for the other without changing anything else, and the difference in received signal is the difference in gain. The consequence for a purchase is simple and often overlooked - a trainer with no reference antenna cannot do gain, only pattern. Ask explicitly whether a reference antenna of stated gain is included, and if so, how its figure was established.

Match: the standing wave ratio meter earns its place

An antenna that radiates badly usually reflects power back down the feed, and the standing wave ratio meter (AST-0007) is how that is measured. It is also the measurement that makes a microstrip antenna (AST-0004) worth having in the laboratory: a patch antenna is narrowband, and sweeping across its band while watching the match is the clearest demonstration there is of resonance in an antenna, and of why bandwidth and size trade against each other. For a student who will go on to work on any modern wireless product, the microstrip patch is the most relevant antenna in the listing.

The propagation and satellite trainers: what each can honestly teach

The wave and propagation trainer (AST-0005) covers the behaviour between antennas rather than the antennas themselves - reflection, refraction, polarisation, and the loss that accumulates with distance. The polarisation demonstration is the one students remember: rotating a receiving antenna through ninety degrees and watching the signal collapse teaches more about polarisation in one minute than a chapter does.

The satellite communication trainer (AST-0009) models an uplink, a transponder that translates frequency, and a downlink. Be clear about what such a trainer demonstrates and what it does not. It demonstrates genuinely: frequency translation, the need for a link budget, the effect of attenuating the path, and why uplink and downlink use different frequencies. It does not reproduce a commercial satellite system, and no bench instrument could. Ask what frequencies the model uses and whether the course material includes a worked link budget - the budget is the transferable skill, and it is the part most often missing.

The radar training system (AST-0010) is listed here but belongs with our radar trainers range, where it sits with the rest of the radar equipment. If radar is your subject, start there.

What to tell us when you enquire

• Your room dimensions and the clear path available, so we can confirm the separation the supplied antennas require.
• Whether the mount must be motorised with an angle readout, or whether manual rotation is acceptable.
• Whether you need to measure gain - and therefore whether a reference antenna of stated gain is required.
• Which antennas the syllabus names: dipole, Yagi, horn, parabolic, microstrip patch, loop.
• Whether a standing wave ratio meter and source are included or already owned, and in which band.
• Whether absorber panels are wanted, and whether the course requires a worked link budget for the satellite trainer.
• Supply voltage and frequency, destination country, and whether your institution has confirmed any spectrum authorisation requirement for the band.

Related ranges: microwave test benches and microwave lab trainers for the sources and waveguide components these measurements use, radar trainers, fibre optics trainers, communication and RF trainers and advanced communication trainers. The full training kits and electronics lab trainer kits categories list the rest.

Frequently asked questions

Why do my measured patterns have no nulls?

Almost certainly room reflections filling them in. Nulls are where the direct signal is weakest, so they are where a reflected signal does the most damage to the measurement. Clear metal objects from around the path, keep people out of it and behind the antennas, raise the antennas away from the floor and bench, and if it matters to the course, add absorber panels. Then repeat a measurement with a cabinet moved - if the pattern changes, you have proved the cause to the class.

How far apart do the antennas need to be?

Beyond the far-field distance for the antennas in use, which depends on the aperture size and the wavelength. For small teaching antennas at microwave frequencies this is usually a practical bench or room distance; for larger apertures or lower frequencies it can exceed what a classroom allows. Tell us the room dimensions with your enquiry and we will confirm whether the configuration fits, because a pattern measured too close is simply not that antenna's pattern, however carefully it was taken.

Can I measure antenna gain with this equipment?

Only if a reference antenna of known gain is included, because teaching-laboratory gain measurement is a substitution comparison against that reference. Ask explicitly whether one is supplied and how its stated gain was established. Without it you can measure patterns and match, which is most of an antenna syllabus, but not gain.

Is a microstrip antenna worth including?

Yes, and we would put it high on the list. It is the antenna form students will actually meet in modern wireless products, and because a patch is narrowband it gives the clearest possible demonstration of resonance and of the trade-off between bandwidth and size. Swept against a standing wave ratio meter it produces a result a student can interpret immediately.

What does a satellite communication trainer actually teach?

Frequency translation through a transponder, why uplink and downlink differ, the effect of path attenuation, and how a link budget is assembled - which is the transferable skill. It does not reproduce a commercial satellite system, and we would rather say so than imply otherwise. Ask whether the course material includes a worked link budget, because that is the part that most often has to be written by the lecturer afterwards.

Do we need spectrum authorisation to run these trainers?

That depends on your country and the band, and it should be settled before purchase. These trainers radiate, and some administrations regulate operation in these bands even indoors. We will state the operating band in writing so your institution can put the question to the national spectrum authority. We will not tell you authorisation is unnecessary, because that is not ours to say.

Key takeaways

• An antenna laboratory measures pattern, gain and match. Check which of the three a quoted trainer can actually do.
• Far-field separation is a physical requirement. A pattern measured too close is not that antenna's pattern - give us your room dimensions before ordering.
• The room is in the measurement. Reflections fill in the nulls; clear the path, keep people out of it, and consider absorber panels.
• No reference antenna, no gain measurement. Ask whether one is included and how its gain was established.
• A motorised, angle-indicated mount is worth the difference when a pattern takes forty points to plot.
• For a satellite trainer, the link budget is the transferable skill. Ask whether the material includes a worked one.

About this page

Ray Export is a manufacturer and exporter of laboratory, scientific and educational equipment based at Plot No. 449, HSIIDC Industrial Area, Saha, Ambala, Haryana 133104, India. Enquiries: [email protected], +91-9817319615.

Written by Palak Mall, Senior Content Writer. Technically reviewed by Arvind Kumar, Lab Equipment Specialist, 12+ years in laboratory and testing instrumentation. Last updated: 17 October 2026.

Notes on this listing, published rather than hidden: every product name in this category currently ends with the phrase "For Vocational Training And Didactic...", which is keyword padding rather than product information, and it has overflowed the name field and truncated several names mid-word. We are stripping it and restoring the names. A "Microwave Test Benches" record and a "Radar Training System" record sit in this listing although both belong with the ranges linked above; both have been flagged to be moved. Far-field distance, room effects and gain comparison as described here are general measurement practice; all product specifications, supplied antennas, reference gains and certification claims will be confirmed in writing on the quotation; for certificates, contact us for the latest copies of the relevant certificates. Verify them before tender submission, and confirm spectrum requirements with your national authority.