Theses›Telecoms & wireless›Diamond RF power

Diamond RF power

Diamond RF power transistors begin displacing GaN at the high-power, high-frequency, thermally-constrained edge of defence radar and satcom by 2030, where diamond's thermal conductivity and breakdown field break the GaN ceiling

  • Bear
  • Early
  • $1.2B by 2035

The callDiamond beats GaN at the hot end of radar and satcom, but that end is worth well under $100M; too small for a venture outcome unless satellite or 6G demand arrives.

D1D2R1R2R3C1foragainst D1D2R1R2R3C1foragainst
Fig. 1The balance. Drivers and catalysts against restraints, each block sized by its weight; catalysts hang dashed because they have not happened yet, sized by their odds. It tips toward the restraints.
  1. D1Phased-array radars, satellite links and 30-50GHz amplifiers all want more power from a smaller chip than GaN-on-SiC can cool.
  2. D2Diamond conducts heat about 15x better than GaN's substrate and takes roughly 3x the electric field, so a diamond transistor sheds the heat GaN cannot.
  3. R1The defence and space radio market diamond would serve is about $1B by 2031, and diamond's near-term slice is well under $100M.
  4. R2Low contact resistance is a lab result; nobody has shipped a packaged all-diamond RF part.
  5. R3Demand is primes' proof-of-concept budgets rather than orders, and GaN-on-SiC stays dominant through 2030 with diamond under 5%.
  6. C1DARPA's THREADS contract with Raytheon reaches transition, moving diamond-on-GaN at 16x output power toward a defence radar part; a heat-spreading story more than an all-diamond one.Nov 2027
Rests onthe beliefs underneath
Supported by · confidence
What would prove itdated tests, open and resolved
20272028202920302031today12345predictionswatch 20272028202920302031today12345predictionswatch
Fig. 2Each ring is a dated test: dashed while open, struck through when overdue, ticked or crossed once resolved.
  1. 1By 31 Dec 2027, at least one all-diamond RF power transistor vendor reports a packaged all-diamond RF device delivered to a defence or satcom customer for evaluation.Dec 2027 · open
  2. 2An all-diamond vendor (Diamond Foundry, Ookuma or CETC) shipping a packaged transistor to a defence or satcom customer for evaluation.Dec 2027 · open
  3. 3An all-diamond startup closing a seed of £2.5M or more with a defence prime or strategic on the cap table.Dec 2028 · open
  4. 4GaN-on-SiC remains the dominant defence/space RF power material through 2030.Dec 2030 · open
  5. 5Diamond passing 5% of defence and space GaN radio; commercial satellite or 6G demand lifting the market would change the view.Dec 2030 · open
Expressionslisted, private, technologies
Private · 5 private companies, 3 of them in the US; none in continental Europe.

Diamond Foundry · Akash Systems · Ookuma Diamond Device · Power Diamond Systems · Advent Diamond

3 more private companies tracked, not shown

Technologies
Who has already bet on itprivate rounds, from public sources

$45M raised by 4 companies, $56M of it in the last three years. Wave building: Money is arriving: recent rounds and tier-1 funds are in, but no runaway leader yet.

Backed by a top-tier venture firm: Akash Systems.

What changedthe record, newest first
  • 23 Jun 2026Diamond RF has a real physics edge over GaN, but the market it would win (~$1B by 2031) is too small to be a venture outcome, so it is a watch/public read, not a thesis.