flat plate antenna

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• Slot antenna — A slot antenna consists of a metal surface, usually a flat plate, with a hole or slot cut out. When the plate is driven as an antenna by a driving frequency, the slot radiates electromagnetic waves in similar way to a dipole antenna. The shape… …   Wikipedia

• Metamaterial antenna — This Z antenna tested at the National Institute of Standards and Technology is smaller than a standard antenna with comparable properties. Its high efficiency is derived from the Z element inside the square that acts as a metamaterial, greatly… …   Wikipedia

• Insect morphology — Legend of body parts Tagmata : A Head, B Thorax, C Abdomen. 1. antenna 2. ocelli (lower) 3. ocelli (upper) 4. compound eye 5. brain (cerebral ganglia) 6. prothorax …   Wikipedia

• radar — /ray dahr/, n. 1. Electronics. a device for determining the presence and location of an object by measuring the time for the echo of a radio wave to return from it and the direction from which it returns. 2. a means or sense of awareness or… …   Universalium

• T-54/T-55 operators and variants — Infobox Weapon name= T 54/55 caption= US Army recognition poster origin= Soviet Union type= Main battle tank is vehicle= yes is UK= yes service= 1947–present used by= wars= designer= Morozov (T 54), OKB 520 (T 54A and later) design date= 1945… …   Wikipedia

• T-72 operators and variants — The T 72 is a Soviet designed main battle tank that entered production in 1971. It replaced the T 54/55 series as the workhorse of Soviet tank forces (while the T 64 and T 80 served as the Soviet high technology tanks). In front line Russian… …   Wikipedia

• Solar thermal collector — A solar thermal collector is a solar collector specifically intended to collect heat: that is, to absorb sunlight to provide heat. Although the term may be applied to simple solar hot water panels, it is usually used to denote more complex… …   Wikipedia

• building construction — Techniques and industry involved in the assembly and erection of structures. Early humans built primarily for shelter, using simple methods. Building materials came from the land, and fabrication was dictated by the limits of the materials and… …   Universalium

• T-34 variants — Infobox Weapon name= T 34 variants caption= T 34 family portrait, 1941 (BT 8, A 20, T 34 Models 1940 and 1941) origin= Soviet Union type= Medium tank is vehicle= yes is UK= yes service= 1940–96 production date= 1940–56 number= about 84,070The T… …   Wikipedia

• Space-based solar power — Left: Part of the solar energy is lost on its way through the atmosphere by the effects of reflection and absorption. Right: Space based solar power systems convert sunlight to microwaves outside the atmosphere, avoiding these losses, and the… …   Wikipedia

• T-62 — Infobox Weapon |is vehicle=yes name=T 62 caption=T 62 at the Museum of the Great Patriotic War in Kiev type=Main battle tank origin=Soviet Union service=July 1961 present used by= wars= designer=OKB 520 design bureau manufacturer= Uralvagonzavod… …   Wikipedia