Meshed Patch Antennas Integrated on Solar Cells Timothy W. Turpin and Reyhan Baktur Abstract—This letter presents the study of integrating meshed patch antennas directly onto the solar cells of a small satellite to save valuable surface real estate. The cover glass of the solar cell is used as the substrate for the antennas. Advanced metro cell antennas increase capacity in three ways. Enterprise Data Centers. Future of Free Cooling Webinar. How the new solar-powered Monitor platform brings free cooling into the future with ZERO emissions and energy costs.

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With the lessons learned from the Egyptian, Libyan, and Syrian revolutions, a few hardware and software hackers over at Lulzlabs have taken it upon themselves to create a free-as-in-beer and free-as-in-speech digital communications protocol that doesn’t deal with expensive, highly-surveilled commercial and government controlled infrastructure. They call it Airchat, and it’s an impressive piece of work if you don’t care about silly things like ‘laws’.

Before going any further, we have to say yes, this does use amateur radio bands, and yes, they’re using (optional) encryption, and no, the team behind Airchat isn’t complying with all FCC and other amateur radio rules and regulations. Officially, we have to say the FCC (and similar agencies in other countries) have been granted the power – by the people – to regulate the radio spectrum, and you really shouldn’t disobey them. Notice the phrasing in that last sentence, and draw your own philosophical conclusions.

Airchat uses an off the shelf amateur transmitter, a Yaesu 897D in the example video below although a $30 Chinese handheld radio will do, to create a mesh network between other Airchat users running the same software. The protocol is based on the Lulzpacket, a few bits of information that give the message error correction and a random code to identify the packet. Each node in this mesh network is defined by it’s ability to decrypt messages. There’s no hardware ID, and no plain text transmitter identification. It’s the mesh network you want if you’re under the thumb of an oppressive government.

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Airchat has already been used to play chess with people 180 miles away, controlled a 3D printer over 80 miles, and has been used to share pictures and voice chats. It’s still a proof of concept, and the example use cases – NGOs working in Africa, disaster response, and expedition base camps – are noble enough to not dismiss this entirely.

Abstract

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Meshed microstrip antennas are optically see‐through when printed on transparent substrates and can potentially be directly integrated on solar cells to save surface real estate of small satellites.Integrating active components such as amplifiers with see‐through antennas further extends multifunctionality of solar panels. Two active integrated meshed patch antennas were studied at 2.48 GHz. The antennas serve as loads for class‐B power amplifiers and as radiators. As a reference, the first design was a regular meshed antenna integrated with an amplifier. In the second design, the antenna was modified to suppress its second harmonics to improve the power added efficiency (PAE) of the integrated amplifier. It was shown that the PAE of the second design is increased by the harmonics suppression. The maximum PAE was measured to be 47.2% for the harmonics suppressing meshed antenna, and the output power is 15.8 dBm at the peak PAE. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1593–1595, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26906

Journal

Microwave and Optical Technology Letters – Wiley

Published: Jul 1, 2012