Helical Magnetic Base Antenna Datasheet
Overview
Description
Helical Magnetic Base Antenna is an omnidirectional antenna tuned for operation in the license-free spectrum band of 433 MHz, 470-510 MHz, and 860-930 MHz. It is lightweight and can be easily mounted on a metallic surface thanks to its strong magnetic base. This antenna is designed to be a perfect match for RAK7258, with stable performance and good VSWR. The coaxial cable attached to the magnetic base has a length of 1.5 meters.
Features
- Connector Type: RP-SMA-J
- Impedance: 50 Ω
- Frequency Range: 433 MHz, 470-510 MHz, and 860-930 MHz
- Radiation Pattern: Omnidirectional
Specifications
Overview
Figure 259: Helical Magnetic Base Antenna 433 MHz
Figure 260: Helical Magnetic Base Antenna 470-510 MHz
Figure 261: Helical Magnetic Base Antenna 860-930 MHzHardware
Electrical Characteristics
| Parameters | Frequency | ||
|---|---|---|---|
| 433 MHz | 470-510 MHz | 860-930 MHz | |
| Gain | -9.5 dBi | -9.5 dBi | 1.27 dBi |
| VSWR | ≤ 2.5 | ≤ 3.0 | ≤ 2.0 |
| Efficiency Max | 12% | 22% | 53% |
| Impedance | 50 Ω | 50 Ω | 50 Ω |
| Polarization | Linear Polarization - Vertical | Linear Polarization - Vertical | Linear Polarization - Vertical |
| Radiation Pattern | Omnidirectional | Omnidirectional | Omnidirectional |
| Connector | RP-SMA-J | RP-SMA-J | RP-SMA-J |
| Length | 142 ± 3 mm | 142 ± 3 mm | 278 ± 3 mm |
Environmental Characteristics
Operation Temperature:
| Frequency | Value |
|---|---|
| 433 MHz | -30° C ~ 65° C |
| 470-510 MHz | -30° C ~ 65° C |
| 860-930 MHz | -20° C ~ 65° C |
Storage Temperature:
| Frequency | Value |
|---|---|
| 433 MHz | -30° C ~ 75° C |
| 470-510 MHz | -30° C ~ 75° C |
| 860-930 MHz | -30° C ~ 75° C |
