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 HALT             highly accelerated life test

HARM            high speed anti-radiation missile

HAST              highly accelerated stress test

HBT                heterojunction bipolar transistor

HDI                 high density interconnect

HDSL             high-bit-rate digital subscriber line

HDTV             high definition television

HEMT             high electron mobility transistor

HEO                high elliptical orbit (satellite)

HFC                hybrid fiber/coax

HFET              heterostructure field-effect transistor

HFSS              high frequency structure simulator

HGA               high gain antenna

HIPERLAN    high performance local area network

HJFET             heterojunction field-effect transistor

HLR                home location register

HMIC             hybrid microwave integrated circuit

HPA                high power amplifier

HPBW             half power beam width

HPSK              hybrid phase shift keying

HSCSD            high speed circuit switched data

HSDPA            high speed downlink packet access

HSPA               high-speed packet access

HSUPA            high-speed uplink packet access

 HTS,HTSC     high temperature superconductor