Product Overview
The VHF Coaxial Circulator is a high-performance 3-port ferromagnetic device operating in the 150-174MHz range. It is engineered to provide superior signal routing with low insertion loss (≤0.8dB) and reliable 100W power handling. By enforcing a Clockwise (1→2→3) signal flow, it effectively isolates sensitive transmitters from reflected power, making it a critical component for military communications, aerospace systems, and high-reliability commercial VHF infrastructure.
Technical & Mechanical Specifications
| Frequency Range | 150 - 174 MHz |
| Bandwidth | 24 MHz |
| Insertion Loss | ≤ 0.8 dB |
| Isolation | ≥ 15 dB |
| VSWR | ≤ 1.30 |
| Power Rating | 100W AV |
| Operating Temperature | -30°C to +70°C |
| Connector Type | SMA-Female |
| Direction | Clockwise (1→2→3) |
NOTE: For optimal performance, ensure all unused ports are terminated with a high-quality 50-ohm load if using as an isolator. Custom frequency ranges and higher isolation variants are available upon request.
Frequently Asked Questions
- Q1: What is the main function of a circulator in a VHF system?
- A: A circulator acts as a one-way street for RF energy. In a typical setup, Port 1 is the Input (Transmitter), Port 2 goes to the Antenna, and Port 3 is connected to a dummy load. This ensures that any power reflected from the antenna (Port 2) is safely diverted to the load (Port 3) instead of returning to damage the transmitter.
- Q2: Can this circulator be converted into an isolator?
- A: Yes. By connecting a 50-ohm high-power termination load to Port 3, this device functions as an Isolator. This setup is highly recommended for protecting RF amplifiers from high VSWR conditions.
- Q3: How does the "Clockwise (1→2→3)" directionality work?
- A: Signal entering Port 1 will exit Port 2 with minimal loss. Signal entering Port 2 will exit Port 3. If any signal enters Port 3, it will exit Port 1. This non-reciprocal behavior is achieved through precise ferromagnetic material tuning.
- Q4: Why use SMA-Female connectors for a 100W VHF device?
- A: SMA-Female connectors offer a compact footprint while maintaining excellent electrical performance up to several GHz. While smaller than N-type, our high-power SMA interfaces are rated to handle the thermal demands of a 100W average power load safely within the specified temperature range.
- Q5: Is this device suitable for outdoor use?
- A: With an operating temperature range of -30°C to +70°C, it is designed for durability. However, it should be housed in an enclosure or weather-shielded cabinet if used in outdoor wireless sites to prevent moisture ingress at the SMA connection points.
Mechanical Drawing
Product Detail Images
