8-канальный разветвитель мощности 1280–1300 МГц: прецизионное распределение сигнала в L-диапазоне

For L-band applications requiring one signal split precisely into eight outputs, MS TELERF’s 1280-1300MHz 8-way power splitter (MPS-1280-08-NF) delivers approximately 9.4dB total loss (including 9.0dB theoretical split loss), ≥20dB isolation, and ±0.2dB amplitude balance. Built in an ISO-certified Singapore factory, this splitter is designed for radar, aviation navigation, and phased-array antenna systems.

1. Executive Summary

• Что это такое: MS TELERF MPS-1280-08-NF is an 8-way, 50W, N-female narrowband Wilkinson power splitter. It divides one input signal into eight outputs with consistent amplitude and phase across the 1280-1300MHz (L-band) диапазон.
• Как это работает: Based on the Wilkinson microstrip topology using quarter-wave transmission lines and isolation resistors. Its narrowband design delivers lower VSWR (typ. 1.25 input / 1.20 output) and better balance than broadband alternatives. Theoretical split loss is 9.0dB; excess insertion loss is ≤0.4dB.
• Почему это важно: In L-band radar, phased arrays, aviation navigation (DME/SSR), and satellite telemetry, amplitude and phase consistency across antenna elements determines system performance. Imbalance causes beam steering errors, elevated sidelobes, and reduced navigation accuracy. The ±0.2dB amplitude and ±3° phase balance ensure proper array coherence.

2. Detailed Overview

2.1 Key Specifications

2.2 How It Works

Это разветвитель uses a Микрополосковая конструкция Уилкинсона. The input signal passes through a microstrip network and splits equally into eight paths. Isolation resistors between output ports ensure that reflections from one port do not disturb the others.

The “narrowband” advantage: Unlike broadband splitters covering multiple GHz, MPS-1280-08-NF focuses all design effort on a 20MHz window (1280-1300MHz). This “single-purpose” approach achieves superior VSWR, insertion loss, and phase balance at these specific frequencies. Broadband splitters are generalists; this one is a specialist – and within its band, it outperforms any generalist.

2.3 Key Advantages

1. Precision amplitude and phase matching: ±0.2dB amplitude balance and ±3° phase balance are the core value proposition. For phased-array antenna systems, this ensures all eight elements see consistent signals, enabling accurate beamforming and steering.
2. Environmental ruggedness: IP65-rated CNC-machined aluminum housing provides dust and water protection. Stable operation from от -40 °C до +70 °C makes it suitable for aviation, defense, and outdoor base station applications.
3. Customization available: While this is a standard product, MS TELERF supports custom modifications like DC-pass for powering remote LNAs or antennas.
4. ISO Singapore factory: Manufactured in MS TELERF’s ISO 9001-certified Singapore facility with strict quality control, ensuring consistency and long-term reliability.

3. Narrowband vs Broadband: Which One Fits Your Application?

4. Deployment Checklist

Step 1: Verify link budget

• Total loss per port = 9.0dB (theoretical) + 0.4dB (excess) = 9.4dB
• With 50W (47dBm) input, each output delivers about 50W / 8 × 10^(-0.4/10) ≈ 5.7W (37.6dBm)
• Ensure input power does not exceed 50W average rating

Step 2: Terminate unused ports

• All unused output ports must be terminated with 50Ω N-type loads. Leaving ports open destroys impedance matching, degrades isolation, and increases VSWR.

Step 3: Use quality N-type cables and connectors

• Use high-quality N-type male cables. Tighten to standard torque (0.7-1.1 N·m). Inspect connectors for cleanliness.

Step 4: Integrate and calibrate phase

• Connect input to signal source (e.g., radar transmitter)
• Connect 8 outputs to antenna elements or receiver channels
• For phased arrays, insert required phase delay lines or phase shifters after the splitter for beam steering

Step 5: Verify performance (recommended)

• Use a VNA to check in-band VSWR and isolation meet expectations after installation

5. Common Mistakes

Mistake #1: Leaving unused ports open
This is the most frequent error. Open ports become reflection sources, degrading isolation and input VSWR. Rule: Every unused N-type output requires a 50Ω termination.

Mistake #2: Using a broadband splitter “just to be safe”
Choosing a broadband splitter for L-band-only applications to keep “flexibility” adds cost and sacrifices the precision balance (±0.2dB/±3°) and low VSWR that MPS-1280-08-NF delivers at 1280-1300MHz. If your band is fixed, use the specialist.

6. FAQ

1. What is the total signal loss per port for this 8-way splitter?
Theoretical split loss is 9.0dB. With ≤0.4dB excess insertion loss, total per-port loss is approximately 9.4dB.

2. Can this splitter be used in reverse (8-to-1 combining)?
Yes, splitters are reciprocal and can function as combiners. However, in combiner mode the power rating drops to 3W.

3. Does it support DC pass-through?
The standard model is AC-coupled due to internal isolation resistors. MS TELERF offers DC-pass custom versions on request.

4. Why does phase matching matter for an 8-way splitter?
In radar and antenna arrays, inconsistent phase across the 8 outputs distorts the beam pattern and creates sidelobes. The ±3° phase balance ensures accurate radiation pattern control.

5. Where is this product manufactured?
It is designed, manufactured, and tested in MS TELERF’s ISO 9001-certified facility in Singapore, meeting international quality standards.