433MHz Spring Antenna 2dbi 0.6x5x28mm

Spring Antenna 433MHz 2dBi – Key Specifications

Dimensions: 0.6mm (wire dia) × 5mm (coil dia) × 28mm (length)

1. RF Characteristics

• Frequency: 433MHz (ISM band)

• Gain: 2dBi (typical)

• Bandwidth: ±10MHz (VSWR <2.0)

• Impedance: 50Ω (nominal)

• VSWR: <1.5:1 at 433MHz

• Polarization: Linear

2. Physical Construction

• Material: Copper spring with nickel plating

• Mounting: Through-hole (THT) or solder pad

• Connector: None (direct solder to PCB)

• Weight: ~0.2g

3. Environmental Ratings

• Operating Temperature: -40°C to +85°C

• Storage Temperature: -55°C to +105°C

• Humidity Resistance: 95% RH (non-condensing)

4. Radiation Pattern

• Omnidirectional in horizontal plane

• Vertical polarization

5. Applications

• 433MHz RF modules (e.g., HC-12, LoRa)

• Remote controls

• Wireless sensors

• IoT devices

PCB Layout Recommendations

1. Ground Plane:

   • Keep clearance ≥5mm around antenna (no copper pour).

2. Matching Network:

   • Use π-network (L/C) to fine-tune impedance.

3. Orientation:

   • Mount vertically for best performance.

Tuning Tips

1. Trim Length:

   • Cut to λ/4 (16.3cm) for 433MHz if needed (this spring is helical-loaded).

2. VNA Testing:

   • Use a vector network analyzer to check S11 parameter.