If you’ve seen a big air-variable capacitor, you may have noticed that some of the plates may have slots cut into them. Why? [Mr Carlson] has the answer in the video below. The short answer: you can ...

Variable capacitors may be useful, but the air gap that provides their capacitance is their greatest weakness. Rather than deal with the poor dielectric properties of air, some high-end variable ...

Abstract: This paper presents a multifunctional reflectarray antenna (MRA) featuring selective in-band switchable polarization and out-of-band radar cross-section (RCS) reduction. To mitigate the ...

Abstract: A wideband, electronically reconfigurable folded reflectarray antenna (RFRA) is proposed, fabricated, and tested, offering wide-angle 2-D beam-scanning in both the azimuth and elevation ...