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New ESA invention examined in a chamber of no echoes

April 10, 2025
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New ESA invention examined in a chamber of no echoes
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Engineers from the European Area Company’s Radio Frequency Equipment and Technology section efficiently examined a brand new radio beamforming idea – developed, patented and prototyped in-house in ESA’s Microwave Laboratory.

This beamforming prototype, examined in ESA’s Antenna Laboratory, demonstrates a brand new means of controlling radio alerts in an antenna array to focus a number of beams in desired instructions, utilizing far fewer parts than conventional techniques with related capabilities do right this moment.

The important thing to the success of this progressive concept lies in a comparatively easy idea – pure geometrical symmetry of antennas and radio beams.    

Listening to the radio, watching TV, making a cell phone name, utilizing satellite tv for pc navigation or forecasting the climate – with out antennas that allow transmission and reception of electromagnetic waves, these on a regular basis actions can be unimaginable.

With the unstoppable development of the quantity of knowledge, customers and a steady technological growth, the complexity of antennas is growing tremendously.

As a substitute of utilizing a single high-power, mechanically steerable antenna, fashionable techniques make use of a set of a number of, low-power antennas working collectively to steer the radio waves in desired instructions – with out pointing the antenna itself. Such ‘antenna arrays’ can comprise lots of and even hundreds of particular person antenna parts – every of them fed individually with alerts generated by a ‘beamformer’, with exactly calculated timing.

Hugo Debergé, ESA’s microwave engineer, explains: “By altering the sign’s part and amplitude for every particular person component in an array, we are able to steer the ensuing sign in a desired path. We don’t do that by bodily tilting the antenna, as we used to do, however as a substitute by adjusting {the electrical} alerts we feed into particular person antenna parts.

“The brand new beamforming expertise we’re testing builds on two separate discoveries, each patented by ESA. The first one is a concept known for over 10 years – it confirmed that in case your antenna array is symmetrical (which is probably going the case), you possibly can deal with symmetrical parts as {couples} and simplify the calculation of particular person alerts in a digital processor. By feeding every couple with alerts which might be complementary to one another, you should have the identical performance as should you have been controlling them as two unbiased parts.”

For those who consider an antenna as a clock face, then the weather positioned at 12 and 6 o’clock would type a pair, and the weather at 3 and 9 o’clock would type one other. If we draw the road of symmetry going throughout the clock in a barely completely different place, the 12 and 9 o’clock parts would type a pair, and the three and 6 o’clock parts would type one other one.

Hugo provides: “The second innovation, patented by ESA in 2023, focuses on the way in which {the electrical} alerts for antenna {couples} are created by {an electrical} circuitry. We got here up with a option to simplify {the electrical} circuit throughout the system in order that it permits us to take away half the parts and nonetheless preserve the identical performance – this can be a main enchancment, drastically lowering the general complexity, mass and energy consumption of your entire setup, whereas doing the very same job.”

Antennas are basic for each spacecraft, permitting the switch of communication or navigation alerts – transmitting and receiving radar radio waves to watch planets, receiving scientific knowledge from deep house or measuring altitude throughout entry descent and touchdown missions.

As with all spacecraft or devices destined for house, a prototype like this one must be examined in an setting that recreates sure circumstances present in house as carefully as attainable.

For antennas, that is finished in anechoic chambers – shielded rooms designed to isolate the gadget below take a look at from the surface world, simulating the infinite void of house.

An anechoic chamber’s thick steel partitions block all outdoors alerts corresponding to radio, TV broadcasts, Wi-Fi and cellular community. On the within, the partitions are lined with pyramid-shaped foam protrusions that soak up any alerts produced by the gadget being examined, creating an area with out echoes to make sure that solely the contributions of the antenna are measured.

The Hybrid European Radio Frequency and Antenna Check Zone (HERTZ), a part of ESA’s Antenna Testing Facility at ESTEC within the Netherlands, is one such chamber.

“The idea demonstrated right here in HERTZ could be very convincing, however that is only the start,” provides Vaclav Valenta, ESA’s microwave engineer a co-inventor of the idea.

“Now, this patented beamforming idea and related experimental outcomes can be found to industries in ESA member states for house use, freed from cost. They will combine this resolution right into a single microchip that may enable for extra compact and low-power options for each house and floor functions.

“Because the idea attracts a whole lot of consideration amongst our industrial companions, a devoted R&D program will probably be initiated quickly to additional improve the expertise readiness. This will probably be applied within the body of an Open Area Innovation Platform (OSIP) name – a instrument for the business maturation of ESA innovations,” concludes Vaclav.

Via the cooperation of the Antenna and Microwave laboratories, ESA covers end-to finish engineering capabilities from design and simulation to prototyping and testing. All that is finished inside one division crew, permitting ESA engineers to shortly show new ideas. This suite of amenities can be accessible for industries and analysis institutes for their very own R&D functions.



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