0.8 GHz to 4 GHz Cavity Backed Spiral Antenna OBS-840
$1765
The OBS-840 is a compact, cavity-backed spiral antenna designed for high-performance transmission and reception across the 0.8 GHz to 4.0 GHz frequency range. With moderate gain and VSWR, this circularly polarized antenna provides an excellent impedance match and radiation pattern.
Key features of this antenna include the ability to receive both linearly and circularly polarized signals, with linear gain approximately 3 dB lower than circular gain. Its low-profile design, planar aperture, minimal phase center offset, flexibility for carrying, and lightweight and symmetrical radiation beam width ensure consistent performance across the entire frequency band. The antenna’s outermost dimensions are a diameter of 68mm and a height of 50mm.
With all the above benefits, it is ideal for a variety of demanding applications. Firstly, one of its key strengths lies in enabling long-range communication with minimal signal attenuation. It is suitable for systems like satellite communication and cellular networks, where broad coverage is essential. In addition, it is vitally important for general-purpose radar applications, including early warning radar and air traffic control, where the range is more critical than resolution. This antenna also plays a crucial role in Signal Intelligence (SIGINT), where its broad frequency range allows for wide-area surveillance and data collection. In contrast, lower frequencies are advantageous in detecting signals over large areas. Despite being mentioned, in Electronic Warfare its capabilities enable it to disrupt or jam communication and radar signals. https://www.rfecho.com/product-category/rf-antenna/cavity-backed-spiral-antenna/
- Description
- Additional information
Description
Product Overview
The OBS-840 is a compact, moderate gain, moderate VSWR, circularly-polarized cavity-backed spiral antenna designed to transmit and receive in the frequency band of 0.8 GHz to 4.0 GHz. The antenna exhibits an excellent impedance match and radiation pattern.
It is capable of receiving both linearly polarized signals and a circularly polarized signal. The linear gain (dBil) is about 3 dB lower than the circular gain (dBic).
The antenna has the advantages of a low profile, a planar aperture, no phase center offset, near-constant beam width across the frequency band, normally symmetrical radiation bandwidth, extreme flexibility for carrying, and lightweight.
These advantages render the antenna a very good candidate for electronic-warfare, direction-finding, telemetry, and surveillance systems, as well as flush-mounted airborne applications. The antenna can be used as a broadband feed for reflector antennas.
The antenna’s outermost dimensions are a diameter of 68mm and a height of 50mm.
Applications
- Satellite communications
- Personal mobile communications
- Electronic Warfare, Direction Finding, Telemetry and Surveillance Systems
- Embedded Airborne Applications
Features
- Very convenient to carry
- Wide frequency band
- Light Weight
- Small volume
- Easy package
- Main lobe width
- With circular polarization, wide beamwidth
| Cavity Backed Spiral Antenna Specifications | |
| Part No. | OBS-840 |
| Frequency | 0.8GHz-4.0GHz |
| Nominal Gain3 dB | 0.6 Typ~2.2 Typ |
| VSWR | Maximum 2.5:1 Typical 2.0:1 |
| Pattern | Directional Beam |
| 3 dB Bandwidth | Minimum 65° Typical 50° |
| 10 dB Bandwidth | 120° Typical |
| Input Impedance | 50 Ohms Nominal |
| Input Connector | SMA-female |
Additional information
| Min. Frequency (GHz) | 0.8 |
|---|---|
| Max. Frequency (GHz) | 4 |
| Gain (dBi) | 0.6 Typ~2.2Typ |
| VSWR | 2.5:1 |
| Impedance (Ω) | 50 |
| Connection Type | SMA-Female |
| Polarization | LHCP/RHCP |