More information: Rosette Maria Bichara et al, A multi-stable deployable quadrifilar helix antenna with radiation reconfigurability for disaster-prone areas, Nature Communications (2023).

[Mark] had his eyes on the nice quadrifilar helical antenna used by the Vaisla R92 radiosonde’s GPS receiver, with the aim of repurposing them. He had a lot of components to remove while still ...

His AirSpy Mini SDR was connected to a home-brew quadrifilar helical (QFH) “eggbeater” antenna on his roof. What’s nice about this antenna is that it’s fixed rather than tracking ...

Figure 12-1: Three radiation modes of a helical antenna The basic concepts of a helix antenna ... However, a helix can be designed with bifilar,4 quadrifilar,5 , 6 or multifilar7 windings. Radiation ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. The best TV antennas are a critical element of any living room. I couldn't live without my ...

Electromagnetic Metamaterials for Advanced Antenna Applications (2005), Grant - Air Force Office of Scientific Research Akyurtlu, A. (Principal) Electromagnetic Metamaterials for Advanced Antenna ...

Electromagnetic Metamaterials for Advanced Antenna Applications (2005), Grant - Air Force Office of Scientific Research Akyurtlu, A. (Principal) Electromagnetic Metamaterials for Advanced Antenna ...

The double helix is a description of the molecular shape of a double-stranded DNA molecule. In 1953, Francis Crick and James Watson first described the molecular structure of DNA, which they ...

Invented by Ampex in 1956, helical scan was the only method that was fast enough to record video in real time. Using two-inch tape and running at 15 ips, the going rate for tape recorders of the ...

This month’s Helix mattress sales sees the launch of the Black Friday deal, and you can enjoy a massive 27% off all mattresses at Helix with exclusive code TOMS27. This is one of the biggest ...

If you're looking for a mattress that can provide proper support for larger bodies, consider the Helix Plus Luxe. Here's what you should know before buying it. Dillon Payne Director of Video ...

A certified sleep science coach and mattress expert, JD has been reviewing online mattresses professionally for the past five years. During that time, he's tested well over 150 beds and dedicated ...