| LAN | local area network | -- |
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| LCA | Lane change assist | An application of automotive radar |
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| LCC | leadless chip carrier | A type of package. |
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| LCP | liquid crystal polymer | A type of low-cost soft substrate. |
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| LDMOS | laterally diffused metal oxide semiconductor | Power amp technology, pioneered by Freescale. |
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| LEC | liquid-encapsulated Czochralski | The most popular method of growing single-crystal GaAs material. |
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| LHCP | left-hand circularly polarized | -- |
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| LMDS | local multipoint distribution system | -- |
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| LNA | low noise amplifier | A low noise amplifier has good noise figure, but limited power handling. Used in a receiver. |
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| LNB | low noise block | Downconverter module consisting of a low noise amplifier and a mixer. Often used to describe the first section of a receiver. |
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| LO | local oscillator | The signal used to drive a mixer to change the carrier frequency. Pronounced "ell-oh", if you say "low" people will immediately think you are a buyer and not an engineer. |
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| LORAN | long range navigation | Actually, this is more like a portmanteau than an acronym. Invented by Alfred Lee Loomis. |
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| LOS | line-of-sight | -- |
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| LPF | low-pass filter | A two-port network that rejects signals above a certain frequency band. |
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| LRL | line-reflect-line | A type of network measurement calibration. |
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| LRM | line-reflect-match | A type of network measurement calibration. |
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| LS | large signal | Range in which stuff acts non-linear. |
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| LSB | least significant bit | In a three-bit phase shifter, the 45 degree bit. |
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| LSG | large signal gain | The gain characteristic of a nonlinear device near its saturation point. |
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| LSM | low side mixing | Refers to the condition that the LO frequency is below the RF frequency. |
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| LTCC | low-temperature co-fired ceramic | A versatile but expensive multi-layer ceramic substrate technology. |
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| LTE | Long term evolution | A wireless communication standard. |
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| LVS | layout versus schematic | A software means of checking that your MMIC circuit will work on the first iteration. |
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