| MAGRAM | magnetic radar absorbing material | Used in radar cross-section reduction. |
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| MAX | maximum | Opposite of min. |
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| MBE | molecular-beam epitaxy | Method of growing semiconductor layers onto a substrate. |
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| MCM | multi-chip module | Refers to a method of fabricating a microwave circuit using directly-bonded integrated circuit chips. |
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| MCM | multi-carrier modulation | A method of transmitting data by splitting it into multiple signals. |
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| MDS | multi-point distribution system, minimum detectable signal | A received signal that is maybe 3 dB higher than the noise level. |
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| MEMS | microelectromechanical system | A microwave career killer. |
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| MEO | medium earth orbit | -- |
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| MESFET | metal/semiconductor field effect transistor | A three-terminal semiconductor device in which a Schottky-metal gate is used to control electron flow between source and drain contacts. |
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| MHEMT | metamorphic high electron mobility transistor | A relatively new GaAs semiconductor technology for millimeterwave applications. |
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| MHZ | megahertz | 1,000,000 cycles per second. |
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| MIC | microwave integrated circuit | An assembly of ceramic substrates and wirebonded components, also called a "hybrid". |
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| MIL-TFD | make it like the f***ing drawing!!! | Nuff said. |
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| MIM | metal-insulator-metal | A type of capacitor on an integrated circuit. |
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| MIMO | multiple input multiple output | A radio architecture for maximizing capacity |
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| MIN | minimum | Opposite of max. |
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| MISFET | metal-insulator-semiconductor field effect transistor | A type of FET that uses a thin layer of insulating GaAs above the channel to isolate the gate. Not used often, but noted for huge voltage/power handling capability. |
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| MISO | multiple input single output | -- |
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| MLB | multi-layer board | -- |
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| MLC | multi-layer capacitor | Usually used as a surface mount capacitor. |
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| MLP | micro leadframe package | One of many package styles. |
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| MMDS | multichannel multiport distribution system | -- |
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| MMIC | monolithic microwave integrated circuit | A single chip containing a microwave circuit. |
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| MMW | millimeter-wave | Frequencies between 30 and 300 GHz. |
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| MOCVD | metallorganic chemical vapor deposition | One of many ways to grow semiconductor films onto a substrate. |
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| MOM | method of moments | The theory behind the EM analysis in Momentum. |
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| MOS | metal-oxide semiconductor | A type of capacitor. |
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| MOSFET | metal/oxide/semiconductor field-effect transistor | A three-terminal semiconductor device which usually is limited to UHF band. |
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| MOVPE | metallorganic vapor-phase epitaxy | One of many ways to grow semiconductor films onto a substrate. |
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| MPA | Medium power amplifier | Little sister of a power amplifier |
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| MPAC | multi-probe anechoic chamber | -- |
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| MPM | microwave power module | What tube guys call the solid-state preamplifier. |
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| MRAD, MR | milliradian | Unit of angle for pretty small stuff. |
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| MS | millisecond | 1/1000 of a second. Time really does fly at this rate. |
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| MS | microstrip | -- |
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| MS | milli-Siemens | 1/1000 of a Seimen. |
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| MSA | microstrip antenna | -- |
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| MSB | most-significant bit | In a three-bit phase shifter, the 180 degree bit. |
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| MTBF | mean time between failure | A measure of reliability. |
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| MTI | moving target indicator | -- |
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| MTTF | mean time to failure | A measure of reliability. |
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| MV | millivolt | 1/1000 of a volt |
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| MVED | microwave vacuum electronics device | -- |
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| MW | milliwatt | Unit of power, 1/1000 of a watt |
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| MW | microwave | As opposed to "MMW" which is millimeter-wave. |
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