The AT Microwave SGA-03B series comprises three WR-3.4 standard gain horn antennas for the 220–330 GHz range (J-band). Three gain variants are offered: AT-SGA-15-03B (15 dBi), AT-SGA-20-03B (20 dBi) and AT-SGA-25-03B (25 dBi) – all with linear polarization, a UG-387/U-M flange and a gold-plated brass body.
What is a standard gain horn antenna?
A standard gain horn antenna (SGA) is a pyramidal horn with a precisely known gain that stays stable across its frequency band. That is exactly why it serves as a reference: in a gain-transfer measurement the unknown device under test is compared against the calibrated standard gain horn, allowing its absolute gain to be determined without a complex absolute measurement. In the J-band (220–330 GHz) – a range on the threshold of the sub-THz region – precisely machined reference horns with a clean radiation pattern are especially important, since even the smallest mechanical tolerances distort the result.
The three gain variants at a glance
| Parameter | AT-SGA-15-03B | AT-SGA-20-03B | AT-SGA-25-03B |
|---|---|---|---|
| Frequency range | 220–330 GHz | 220–330 GHz | 220–330 GHz |
| Gain (typ.) | 15 dBi | 20 dBi | 25 dBi |
| Polarization | linear | linear | linear |
| 3 dB beamwidth, E-plane | 9° | 10° (@ 275 GHz) | 9° |
| 3 dB beamwidth, H-plane | 10° | 13° (@ 275 GHz) | 10° |
| Side lobes, E-plane | 20 dB | 12 dB | 20 dB |
| Side lobes, H-plane | 20 dB | 24 dB | 20 dB |
| Match | VSWR 1.2:1 | Return loss > 27 dB | VSWR 1.2:1 |
| Operating temperature | 25 °C | 25 °C | 25 °C |
| Waveguide port | WR-3.4 | WR-3.4 | WR-3.4 |
| Flange | UG-387/U-M (anti-cocking) | UG-387/U-M (anti-cocking) | UG-387/U-M (anti-cocking) |
| Material / finish | brass, gold-plated | brass, gold-plated | brass, gold-plated |
| Weight | 16 g | 16 g | 16 g |
All values per manufacturer datasheet (typ.). The beamwidth of the 20 dBi variant is specified at 275 GHz.
Applications
- mmWave communication
- FOD detection (foreign object debris)
- System setups and measurement benches
- Antenna gain measurement (gain reference)
Series scalable up to 1100 GHz
The SGA-03B models shown here cover the J-band. Beyond that, AT Microwave manufactures standard gain horn antennas up to 1100 GHz (up to WR-1.0) – matching waveguide sizes for higher bands are available on request.
Availability
bq-microwave is the European distributor for AT Microwave. For quotes, lead times or help selecting the right gain variant, feel free to contact us.