In this paper, the design and development of a broad-band double ridge horn antenna (DRHA) have been presented. From the throat to the aperture, the ridge is tapered for smooth impedance matching ...

A granny square, also known as an ‘afghan square’ in the US, forms the basis for many crochet patterns. And once you've mastered it, you'll be able to crochet your own blanket, cushion or cardigan.