Abstract: A frequency-reconfigurable spirograph planar monopole antenna (SPMA) operating in the ultrahigh frequency (UHF) band using RF p-i-n diodes is presented, including experimental verification.

Months ago, I observed a student drawing spiraling circles over and over on a sheet of notebook paper while participating in our class discussion. For some reason, I was reminded of an old toy my ...

5 colourful images of nebula captured by NASA Hubble Space Telescope Hourglass Nebula: This Hubble image reveals the true shape of MyCn18 to be an hourglass with an intricate pattern of "etchings" in ...

5 stunning and colourful images of nebula captured by NASA Hubble Space Telescope Hourglass Nebula: This Hubble image reveals the true shape of MyCn18 to be an hourglass with an intricate pattern of ...

After studying the intricate designs of a pound note, Denys Fisher came up with the idea for the legendary pattern-drawing toy, Spirograph. It won the Toy of the Year in 1967 and had sold over 30 ...

Hubble’s Spirograph In this classic Hubble image from 2000, the planetary nebula IC 418 glows like a multifaceted jewel with enigmatic patterns. This image shows a composite view of the Crab nebula, ...

We acknowledge Aboriginal and Torres Strait Islander peoples as the First Australians and Traditional Custodians of the lands where we live, learn and work.

Hubble Space Telescope captured this image of Backlit wisps along the Horsehead Nebula upper ridge are being illuminated by Sigma Orionis. Hubble’s Spirograph In this classic Hubble image from 2000, ...

With inspiration from the famous Spirograph Girl, primary school pupils aged 7 to 11, kids can create autumn themed Spirograph designs to win a Spirograph bundle for themselves and their school, plus ...

Scientific American is part of Springer Nature, which owns or has commercial relations with thousands of scientific publications (many of them can be found at www ...

You have likely played with the timeless game Spirograph at some point in your lifetime. It was a staple in every home when I was growing in Levittown. For those unfamiliar, it was a drawing game that ...

Colored patterns like spirograph drawings. Isolated vector... Guilloche vector pattern set (watermarks). Useful for banknote, money design Useful for diploma, certificate, note, currency, voucher ...