| G | gravity unit | Measurement of how hard a part will be accelerated. |
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| GA | available gain | Computed from S-parameters of a two-port network. |
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| GAAS | gallium arsenide | III-IV compound that is a staple of the microwave IC world. |
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| GAN | gallium nitride | An immature wide-bandgap III-V semiconductor technology that may offer a 10 dB increase in output power for the same size GaAs device. |
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| GBS | Giga-bits per second | A unit of data rate |
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| GCPW | grounded coplanar waveguide | What you get when you add a ground plane under the substrate below CPW. Basically a mixed-mode microstrip/CPW transmission line. Also called conductor-backed coplanar waveguide (CBCPW). |
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| GEO | geostationary earth orbit | A position in near-space at which a satellite remains in the same position relative to the earth below. |
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| GHZ | gigahertz | 1,000,000,000 cycles per second. Currently, the clock speed of a fairly inexpensive personal computer. |
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| GL | grating lobe | See phased arrays. |
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| GMAX | maximum gain | The theoretical gain of an amplifier when it is conjugately matched. |
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| GOPT | gamma optimum | One of three noise parameters for a device, refers to the generator impedance required for minimum noise figure. Used in noise figure calculations, along with RN and NFmin. |
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| GPIB | general purpose interface bus | -- |
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| GPO | Gilbert push-on | A trademarked family of RF connectors, now owned by Corning. |
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| GPS | global positioning system, ground-plane spacing | What terrorists will use to position their first nuclear bomb, or a key dimension in stripline. |
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| GR | ground | A potential of zero volts, usually with respect to the chassis. |
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| gs 2 | general studies 2 | qualifying in nature |
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| GSG | gorund signal ground | The normal configuration for co-planar RF probes. |
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| GSM | global system for mobile communications | Digital cell phone standard. |
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| GSO | geo-synchronous orbit | -- |
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