Spiral Antennas
Source: Cobham
Nurad offers cavity backed spirals with a variety of package and performance options. These Archimedean spirals employ very broadband balun feed networks and are available in right- and left-hand polarizations...
Nurad offers cavity backed spirals with a variety of package and performance options. These Archimedean spirals employ very broadband balun feed networks and are available in right- and left-hand polarizations. Current spiral designs provide frequency coverage in discrete bands from 200 MHz to 40 GHz and diameters from greater than 30 inches to less than 1 inch. Typical antennas operate continuously over bands such as 2 to 18 GHz and 18 to 40 GHz, while maintaining excellent radiation pattern characteristics and low axial ratio. Nurad also offers extended band spirals to meet special customer requirements. Phase and amplitude tracking characteristics can be incorporated and matched sets can be provided for specific applications.The cavity backed spiral antenna's rugged construction and lightweight, moisture sealed design make it well suited for the extreme conditions of airborne platforms, and typical applications include RWR and direction finding systems for both airborne and shipboard systems.
Click here to download Nurad's Antenna & Radome Design Aids document in pdf format.
Product Data Table
| Model Number | Frequency Band | Polarization | Axial Ratio | VSWR | Gain | Size |
|---|---|---|---|---|---|---|
| (GHz) | (Max) | (Max) | (Nominal) | (Inches) | ||
| A1520 | 0.2 to 1 | RHCP or LHCP | 1 dB | 2.0:1 | -5 to 5 dBiC | 21 Dia. x 4.3 |
| 888-8100-01 | 0.5 to 2 | RHCP | 5 dB | 3.0:1 | -20 to -3 dBiL* | 3.67 x 3.67 x 4.07 |
| 9D31800 | 0.5 to 18 | LHCP | 3 dB | 2.5:1 | -17 to 1 dBiL* | 2.75 Dia. x 4.72 |
| A2200 | 0.6 to 18 | RHCP or LHCP | 2 dB | 2.3:1 | -9.5 to 2 dBiL* | 6.85 Dia. x 4.8 |
| 9C40100 | 2 to 8 | RHCP | 2 dB | 2.5:1 | 0 dBiL* | 2.36 x 2.18 x 1.09 |
| 9C36800 | 2 to 18 | LHCP | 1.5 dB | 2.0:1 | -9 to 0 dBiL* | 2 Dia. x 2.03 |
| 9C37200-4 | 2 to 18 | LHCP | 2 dB | 2.5:1 | -5 to 3 dBiC* | 2 Dia. x 3.1 |
| 9C40800 | 2 to 18 | LHCP | 3 dB | 2.5:1 | -9 to 0 dBiL* | 2 Dia. x 1.62 |
| 9C37300 | 2 to 18.5 | LHCP | 2 dB | 3.0:1 | -7.5 to 1 dBiL* | 2.43 Dia. x 2 |
| 9C33600 | 4 to 18 | LHCP | 2 dB | 2.5:1 | -2 to 1 dBiL* | 1.75 Dia. x 2 |
| 9C40000 | 8 to 18 | RHCP | 2.5 dB | 2.5:1 | -1 dBiL* | 1.5 Dia. x 0.8 |
| A4430 | 8 to 40 | RHCP | 3 dB | 3.0:1 | -3 to 3 dBiC | 0.75 Dia. x 1 |
| A4400 | 18 to 40 | RHCP | 2 dB | 3.0:1 | -5 to 0 dBiL* | 0.88 x 0.88 x 0.74 |
* Measured at the minimum of ellipticity ratio.
For more information on other Cobham Defense Antennas, click here.
Other Antennas by Cobham Defense Electronics:
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