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Pyramidal microwave horn antenna, with a bandwidth of 0.8 to 18 GHz. A coaxial cable feedline attaches to the connector visible at top. This type is called a ridged horn; the curving fins visible inside the mouth of the horn increase the antenna's bandwidth. The first modern horn antenna in 1938 with inventor Wilmer L. Barrow.
Feed horn with concentric rings (left) and LNB (right) on a Hughes DirecWay home satellite dish. An LNBF (LNB with integrated feed horn) that has been cut into two.Visible is the scalar horn antenna (the funnel with concentric rings), which couples the microwave beam into a short waveguide (the tube connecting the feed horn to the LNB electronics part of the LNBF).
A telecommunications tower with a variety of dish antennas for microwave relay links on Frazier Peak, Ventura County, California. The apertures of the dishes are covered by plastic sheets to keep out moisture. Microwave is a form of electromagnetic radiation with wavelengths shorter than other radio waves but longer than infrared waves.
Cover and cook over low heat 20 min. or until fish is done. Sprinkle fish with crumb topping. Simmer, uncovered, 5 min. or until rice is done. Stir rice before serving. To prepare in microwave: Use same ingredients as oven version, but mix seasoning, hot water, butter and rice in 3-qt. microwavable casserole. Top with fish in a single layer.
Combine the onion, garlic, and water in a microwave safe bowl. Season with salt and pepper to taste. Cover the bowl tightly with plastic wrap, and microwave on high for 10 minutes.
Microwave ovens operate by emitting electromagnetic waves, particularly microwaves, which interact with water molecules in the food. These microwaves cause the water molecules to oscillate rapidly ...
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