This page will contain external links about Microwave, as they become available.MicrowaveMicrowaves are electromagnetic waves with wavelengths longer than those of infrared light, but relatively short for radio waves. Microwaves have wavelengths approximately in the range of 30 cm (frequency = 1 GHz) to 1 mm (300 GHz). However, the boundaries between far infrared light, microwaves, and ultra-high-frequency radio waves are fairly arbitrary and are used variously between different fields of study. A credible definition comes from Pozar's text "Microwave Engineering", which states that the term microwave "refers to alternating current signals with frequencies between 300MHz (3 x 10^8 Hz) and 300GHz (3 x 10^11 Hz)." The existence of electromagnetic waves, of which microwaves are part of the higher frequency spectrum, was predicted by James Clerk Maxwell in 1864 from his famous Maxwell's equations. In 1888, Heinrich Hertz was the first to demonstrate the existence of electromagnetic waves by building apparatus to produce radio waves. The microwave range includes ultra-high frequency (UHF) (0.3-3 GHz), super high frequency (SHF) (3-30 GHz), and extremely high frequency (EHF) (30-300 GHz) signals. Above 300 GHz, the absorption of electromagnetic radiation by Earth's atmosphere is so great that it is effectively opaque , until the atmosphere becomes transparent again in the so-called infrared and optical window frequency ranges. GenerationMicrowaves can be generated by a variety of means, generally divided into two categories: solid state devices and vacuum-tube based devices. Solid state microwave devices are based on semiconductors such as silicon or gallium arsenide, and include field-effect transistors (FET's), bipolar junction transistors (BJT's), Gunn diodes, and IMPATT diodes. Specialized versions of standard transistors have been developed for higher speed which are commonly used in microwave applications. Microwave variants of BJT's include the heterojunction bipolar transistor (HBT), and microwave variants of FET's include the MESFET, the HEMT (also known as HFET), and LDMOS transistor. Vacuum tube based devices operate on the ballistic motion of electrons in a vacuum under the influence of controlling electric or magnetic fields, and include the magnetron, klystron, traveling wave tube (TWT), and gyrotron. UsesPlot of the zenith atmospheric transmission on the summit of Mauna Kea throughout the entire gigahertz range of the electromagnetic spectrum at a precipitable water vapor level of 0.001 mm. (simulated)
Microwave frequency bandsThe microwave spectrum is usually defined as electromagnetic energy ranging from approximately 1 GHz to 1000 GHz in frequency, but older usage includes lower frequencies. Most common applications are within the 1 to 40 GHz range. Microwave Frequency Bands are defined in the table below: The above table reflects Radio Society of Great Britain (RSGB) usage. The term P band is sometimes used for UHF frequencies below L-band. For other definitions see Letter Designations of Microwave Bands History and researchPerhaps the first use of the term microwave occurred in 1931: Perhaps the first use of the word microwave in an astronomical context occurred in 1946 in an article "Microwave Radiation from the Sun and Moon" by Robert Dicke and Robert Beringer. For some of the history in the development of electromagnetic theory applicable to modern microwave applications see the following figures:
Specific significant areas of research and work developing microwaves and their applications: The Microwave integrated devices which are called MMIC (Monolithic Microwave Integrated Circuit) are manufactured by using mostly gallium arsenide (GaAs) wafers. References
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The Microwave integrated devices which are called MMIC (Monolithic Microwave Integrated Circuit) are manufactured by using mostly gallium arsenide (GaAs) wafers. Perhaps the first use of the term microwave occurred in 1931:. Current press runs say it feels better (handling-wise) over bumps and in turns than the IRS on the ’03. For other definitions see Letter Designations of Microwave Bands. Revised bushings, spring rates and shock rates. The term P band is sometimes used for UHF frequencies below L-band. Suspension: Stock Mustang GT K-member. The above table reflects Radio Society of Great Britain (RSGB) usage. Weight: 3850 lbs with F/R distribution of 57/43. Microwave Frequency Bands are defined in the table below:. Eaton is currenlty claiming a 15% improvement in adiabatic efficiency over the M112. Most common applications are within the 1 to 40 GHz range. It has redesigned rotor and port design over the M112 currently used in the 2003/04 Cobra. The microwave spectrum is usually defined as electromagnetic energy ranging from approximately 1 GHz to 1000 GHz in frequency, but older usage includes lower frequencies. Supercharger: Due to availablity issues of the twin screw Whipple shown in the early prototype, the Eaton M122H (H for hybrid…revised 5th-gen blower) Roots-style blower will be used. Vacuum tube based devices operate on the ballistic motion of electrons in a vacuum under the influence of controlling electric or magnetic fields, and include the magnetron, klystron, traveling wave tube (TWT), and gyrotron. Heads are directly from the GT, including cams, valves, springs and ports and even have the same part number! Redline is 6,000 rpm and fuel shut off is 6,250. Microwave variants of BJT's include the heterojunction bipolar transistor (HBT), and microwave variants of FET's include the MESFET, the HEMT (also known as HFET), and LDMOS transistor. Mahle connecting rods which the engineers claim are on par w/ the Manleys in the ‘03s, but less expensive. Specialized versions of standard transistors have been developed for higher speed which are commonly used in microwave applications. 8.5:1 on the ’03 Cobras.) Ford GT crank. Solid state microwave devices are based on semiconductors such as silicon or gallium arsenide, and include field-effect transistors (FET's), bipolar junction transistors (BJT's), Gunn diodes, and IMPATT diodes. Static compression ratio is 8.4:1 (same as Ford GT, but vs. Microwaves can be generated by a variety of means, generally divided into two categories: solid state devices and vacuum-tube based devices. Engine: Wet-sumped 5.4L iron block). . (Smaller diameter reduces polar moment of mass inertia so less inertial loss during acceleration.). Above 300 GHz, the absorption of electromagnetic radiation by Earth's atmosphere is so great that it is effectively opaque , until the atmosphere becomes transparent again in the so-called infrared and optical window frequency ranges. Clutch is a double-disk unit (215 mm = 8.44 in) sourced from Valeo. The microwave range includes ultra-high frequency (UHF) (0.3-3 GHz), super high frequency (SHF) (3-30 GHz), and extremely high frequency (EHF) (30-300 GHz) signals. So overall gear ratio in 1st is 9.831 (vs 9.443 on the ’03). In 1888, Heinrich Hertz was the first to demonstrate the existence of electromagnetic waves by building apparatus to produce radio waves. Rear-end ratio is 3.31 (vs 3.55 on the ’03). The existence of electromagnetic waves, of which microwaves are part of the higher frequency spectrum, was predicted by James Clerk Maxwell in 1864 from his famous Maxwell's equations. 2.66 on the ’03 and ‘04s). A credible definition comes from Pozar's text "Microwave Engineering", which states that the term microwave "refers to alternating current signals with frequencies between 300MHz (3 x 10^8 Hz) and 300GHz (3 x 10^11 Hz).". Transmission/Gearing/Clutch: First gear is 2.97:1 (vs. However, the boundaries between far infrared light, microwaves, and ultra-high-frequency radio waves are fairly arbitrary and are used variously between different fields of study. However some information on the GT500 has leaked to the automotive press the past few weeks:. Microwaves have wavelengths approximately in the range of 30 cm (frequency = 1 GHz) to 1 mm (300 GHz). The final design and specifications will be released at the Detroit NAIAS January 8-20th 2006. Microwaves are electromagnetic waves with wavelengths longer than those of infrared light, but relatively short for radio waves. The 475-plus horsepower and 475 lb/ft of torque, supercharged 5.4-liter, V-8 is the first production vehicle in a string of specialty Mustangs that SVT will help deliver. ISBN 0-201-50418-9. The SVT Team unveiled what is being called the most powerful factory Mustang ever at the New York International Auto Show on March 23rd, 2005. Microwave Engineering Addison-Wesley Publishing Company. The 2007 SVT Cobra is now called the Shelby GT 500. (1993). Owners are reporting as much as 650 rear wheel horsepower to a stock rotating assembly with the use on a 2.3L Whipple or 2.2L/2.4L Kenne Bell twin screw supercharger and increased boost pressure. Pozar, David M. The 2003-2004 SVT is heavily noted as one of the best bangs for the buck. Oliver Lodge. While in production, SVT had codenamed this model the "Terminator" since it was supposed to finally put an end to any competition between the Cobra and the Trans Am / Camaro. Lord Rayleigh. The only major addition to the 2004 model was the optional Mystichrome paint scheme. Oliver Heaviside. Other improvements to the driveline include the use of a Tremec T-56 six speed transmission and stronger 31 spline half shafts in the independent rear suspension. Sir William Thomson, later Lord Kelvin. The motors internals were also strengned through the use of forged pistons and Manley H-beam connecting rods. Samuel Morse. A cast iron cylinder block was used in place of the aluminum block which had been standard on 1996-2001 Cobra models. Guglielmo Marconi. Numerous improvements were made to the driveline to handle the additional power output. Nikola Tesla. It was later learned that SVT had underrated the Cobra, as many owners have reported an average of 430 hp and 430 ft·lbf of torque. Heinrich Hertz. Debuting in early 2002, the 2003 Cobra came with a supercharged 4.6 L DOHC engine with 390 hp (291 Kw) and 390 ft·lbf (528 Nm) of torque. James Clerk Maxwell. The Cobra came back in 2001 with the same power and the problem fixed. Michael Faraday. Due to problems with the 1999 Cobras producing the claimed power, the 4.6 L Cobra was not produced in 2000. A maser is a device similar to a laser, except that it works at microwave frequencies. In 2000, a special Cobra R came in limited production of 300 with a 5.4 L DOHC engine that produced 385 hp (287 Kw) and 385 ft·lbf (521 Nm) of torque. NASA worked in the 1970s and early 1980s to research the possibilities of using Solar power satellite (SPS) systems with large solar arrays that would beam power down to the Earth's surface via microwaves. The new Cobra had an upgraded 4.6 L DOHC engine with 320 hp (239 kW) and 317 ft·lbf (429 Nm) of torque. Microwaves can be used to transmit power over long distances, and post-World War II research was done to examine possibilities. All 1999-2004 Cobras featured independent rear suspensions, unique to the Cobras. Many semiconductor processing techniques use microwaves to generate plasma for such purposes as reactive ion etching and plasma-enhanced chemical vapor deposition (MPCVD). With the introduction of a new Mustang in 1999, came a new SVT Cobra. Some cellphone networks also use the lower microwave frequencies. The '96 model proved capable of performance levels matching those of the '95 Cobra R. Cable TV and Internet access on coax cable as well as broadcast television use some of the lower microwave frequencies. of torque at 4800 rpm, making the Cobra capable of running 0-60 miles per hour in 5.9 seconds. The commercial implementations are in the 2.5 GHz, 3.5 GHz and 5.8G Hz ranges. They did this by taking the existing 280HP DOHC 32V all aluminum modular engine and massaging it to produce 305 horsepower at 5800 rpm and 300 lbs.-ft. The IEEE 802.16 specification was designed to operate between 2 to 11 GHz. The new engine became standard equipment in the Mustang GT, but the SVT division wanted and needed more for the Cobra in order for it to compete with the more powerful Camaro models. Metropolitan Area Networks - MAN protocols, such as WiMAX (Worldwide Interoperability for Microwave Access) based in the IEEE 802.16 specification. For 1996, Ford finally did away with the aging 5.0 liter OHV V8, replacing it with a new 4.6 liter, SOHC, "modular" unit that was smoother, had slightly better fuel economy, and was able to meet pending emissions standards; peformance, however, was roughly the same. Licensed long-range (up to about 25 km) Wireless Internet Access services can be found in many countries (but not the USA) in the 3.5–4.0 GHz range. Only 250 vehicles were built, available only in white, each with a unique center-tiered fiberglass hood tall enough to clear the engine and induction system. Wireless LAN protocols, such as Bluetooth and the IEEE 802.11g and b specifications, also use microwaves in the 2.4 GHz ISM band, although 802.11a uses an ISM band in the 5 GHz range. Heavy-duty progressive-rate springs, thicker stabilizer bars and a front strut tower brace helped improve handling on the racetrack. Radar also uses microwave radiation to detect the range, speed, and other characteristics of remote objects. Again, weight-savings was targeted, so there was no back seat, radio or air-conditioning – not even fog lights, which were omitted to provide ducts for getting cool air onto the front brakes. Typically, microwaves are used in television news to transmit a signal from a remote location to a television station from a specially equipped van. To handle the torque of the more powerful engine, a Tremec five-speed manual transmission was installed. There is also much more bandwidth in the microwave spectrum than in the rest of the radio spectrum. In response to those requests, SVT replaced the Cobra’s 5.0L V8 with an SVT modified version of Ford’s 5.8 liter Windsor V8, re-engineered to produce 300 horsepower and installed a 20 gallon fuel tank. Microwaves are used in broadcasting transmissions because microwaves pass easily through the earth's atmosphere with less interference than longer wavelengths. Top priority became addressing customer requests for a larger, more powerful engine and more fuel capacity. Since organic matter is made up primarily of water, food is easily cooked by this method. In the wake of the '93 R’s unexpected success, SVT engineers developed a more powerful R-model based on the1995 Cobra. The vibration creates heat which warms the food. Ford re-introduced the Cobra for '94 featuring the new styling as well as larger brakes, a revised suspension setup and wider wheels than the outgoing version, but the engine was essentially a carryover. Microwaves cook food by causing molecules of water and other compounds to vibrate or rotate. Ford introduced a completely re-styled Mustang for the 1994 model year, but the vehicle was mechanically similar to the outgoing model, and rode on a version of Ford's aging Fox platform. A microwave oven uses a magnetron microwave generator to produce microwaves at a frequency of approximately 2.45 GHz for the purpose of cooking food. In keeping with its more track-oriented nature, non essential items such as air conditioning, sound deadening, stereo system and rear seats were not present on the Cobra R to minimize its weight. Ford debuted a Cobra R as a late '93 model, a more track-oriented version of the Cobra featuring larger brakes, altered spring rates and shocks and a new 21mm rear anti-roll bar. It shared its platform with the Fox-bodied Mustang GT, but featured an upgraded suspension system and a high-output version of the GT's 5.0 liter OHV V8 producing 235 hp (175 kW) and 280 ft·lbf (379 Nm) of torque. Ford introduced the Cobra variant of the Mustang in 1993 to help boost sales and the overall image of the Mustang, although in later years Ford's focus for the Cobra was as a competitor to Chevrolet's Camaro SS and Pontiac's Trans AM WS6. . On rare occasion, Ford produces a higher-performance Cobra R variant. It is generally the highest performance version of the Mustang built by Ford, sitting in the model range above the Mustang GT model. The Ford Mustang SVT Cobra is a sportscar built by Ford since 1993. |