| H | Henry | A unit of inductance, named after a dead American, Joseph Henry. |
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| H-POL | horizontal polarization | -- |
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| HAST | highly-accelerated life test | The "pressure cooker" of qual tests! |
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| HB | harmonic balance | A method of analyzing circuits with non-linear behavior. |
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| HBT | hetero-junction bi-polar transistor | A good competitor to pHEMT, and requires only one power supply polarity. |
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| HDPE | high density poly-ethelene | Also known as PEHD in countries such as France, HDPE is number 2 in the recycling categories. Chances are your milk jug is made of it. It is also a useful dielectric, with DK of 2.3 and DF of 0.003. |
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| HEMT | high electron mobility transistor | Developed in the 1990s, provides better microwave performance compared to MESFETs. |
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| HEPA | high efficiency particulate air (filter) | The type of filters used to filter out particles down to 0.3 micron in a clean room. |
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| HEXFET | hexagonal field-effect transistor | A trademark of International Rectifier for their MOSFET line. |
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| HFET | heterostructure field-effect transistor | -- |
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| HFSS | High-Frequency Structural Simulator | Ansoft's 3D EM simulation tool. |
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| HPA | high-power amplifier | -- |
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| HPBW | half-power beamwidth | Used to describe an antenna pattern. |
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| HPF | high pass filter | A two-port network that rejects signals below a certain frequency band. |
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| HPIB | Hewlett Packard instrument bus | Too late to rename it "Agilent instrument bus" |
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| HPIN | horizontal PIN diode | -- |
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| HPM | high-power microwave | Generally refers to a source module that is a combination of a solid-state driver circuit and a TWT. |
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| HSM | high-side mixing | Refers to the condition that the LO frequency is above the RF frequency. |
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| HTCC | high-temperature co-fired ceramic | A method of fabricating circuit traces embedded in ceramic. |
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| HTS | high-temperature superconductor | -- |
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| HZ | Hertz | Unit of cycles-per-second, named after a dead German. Not to be confused with the dead Austrian who started that rental car company. |
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