Combinador híbrido de 4 entradas y 4 salidas, de 500 a 6000 MHz: combinación de señales de banda ancha para 5G y DAS

MS TELERF 500-6000MHz 4-in-4-out combinador híbrido: 500MHz to 6GHz coverage, ≥60dB isolation between input ports, and -160dBc PIM (@2×43dBm).

How it works: Four cavity filters are integrated inside, each channel filters independently before combining at the output. Each channel delivers ≥60dB out-of-band rejection, so signals from adjacent ports do not leak through. PIM at -160dBc exceeds the typical industry standard of -153dBc by a solid margin, making intermodulation products negligible in high-power multi-carrier environments.

Who needs it: 5G macro base stations with multi-band combining, DAS for multi-operator signal combining, satellite ground stations, and any setup that merges multiple signals into a single antenna feed.

What “4-In-4-Out” Means

Most combiners are “multiple-in, one-out” — several signals go in, one comes out. This product’s “4-in-4-out” means: 4 input ports, each with a filter tuned to a specific band, and all four signals combine internally to a single output.

Input 4 different signals, get 1 combined signal out. Not splitting one signal into four (that is a power divider’s job), but merging four different frequencies onto one main line.

The advantage: each input port is optimized for its specific frequency band. One port handles 700MHz, another handles 3.5GHz. Each gets its own dedicated filter. That performs better than using one wideband filter that tries to cover everything.

Key Specifications

Four Key Metrics

1. Isolation: ≥60dB — Why It Matters

Isolation measures how much signal from one input port leaks into another. Port 1 carries a 2.6GHz signal at 50W. Port 2 carries a 3.5GHz signal at 50W. With low isolation, the 2.6GHz signal leaks into Port 2’s path, mixes with the 3.5GHz signal, passes through amplifiers, and generates spurious products. At ≥60dB isolation, leakage is one-millionth of the original signal — negligible in practice.

How good is 60dB? Most standard combiners offer 40-50dB. 60dB puts this in the high-isolation category, essential for high-power, high-spectrum-efficiency deployments. The approach here: each input port has its own cavity filter, and channel isolation comes from the filter’s out-of-band rejection.

2. PIM: -160dBc — 10dB Above Standard

Tested at 2×43dBm (20W per carrier), the industry standard condition. -160dBc means the intermodulation product is 100 million times lower than the carriers. Industry standard YD/T 3251.1-2025 requires ≤-150dBc for mobile distribution system passive components. -160dBc is 10dB better.

Does 10dB matter? In regular coverage, maybe not. But in high-spectrum-utilization, high-power, multi-carrier environments — a site running both 4G and 5G with multiple carriers tightly packed — that 10dB can be the difference between self-interference and clean operation.

MS TELERF achieves this through two controls: non-magnetic materials for cavities and conductors to eliminate ferromagnetic nonlinearity, plus high-purity silver or tri-metal (white bronze) plating with tight thickness control. The principle is straightforward. The difficulty is consistency and repeatability across production.

3. Insertion Loss: ≤1.2dB — Where the Link Budget Margin Comes From

Each channel’s insertion loss is ≤1.2dB. Compared to typical wideband combiners at 2-3dB loss, the improvement comes from narrowband filtering — each channel only processes its own frequency segment, making the cavity resonator more efficient.

In tight link budgets, the difference between 1.2dB and 2.5dB (1.3dB) means about 25% more effective radiated power at the antenna with the same input power. Direct impact on coverage distance and signal quality.

4. Frequency Range: 500-6000MHz — Why Start at 500MHz?

Many wideband combiners start at 600MHz or 698MHz because that is where 4G/5G low bands begin. 500MHz covers TETRA (380-430MHz), public safety (450-470MHz), and other professional communications bands.

The 6GHz upper limit covers WiFi 6E/7 (6GHz band), 5G n78 (3.5GHz), and existing WiFi bands (5.2-5.8GHz). One combiner covers all — one device per site instead of swapping combiners for different bands.

Escenarios de aplicación

Scenario 1: Macro Base Station Multi-Band Combining

A 5G site typically runs multiple bands — 700MHz for coverage, 2.6GHz for capacity, 3.5GHz for high-band. Three RRUs, three bands, one antenna feed. The 4 inputs handle these three bands, with one port spare.

Scenario 2: DAS Multi-Operator Combining

In-building DAS often needs to combine signals from multiple carriers. With China Tower’s co-construction push, one Sistema DAS may handle Mobile, Unicom, and Telecom across different bands. 4 inputs take different carrier sources, combine to one output feeding the antenna system. ≥60dB isolation keeps carriers from interfering with each other.

Scenario 3: Satellite Ground Stations

Ground stations frequently transmit and receive multiple frequencies simultaneously. Combiners merge different transmit frequencies onto one antenna feed. 500-6000MHz covers most satellite communication bands. 50W power handling is sufficient for ground station applications.

Preguntas frecuentes

1. What is the difference between a 4-in-4-out combiner and a power divider?

A power divider splits one signal into multiple outputs (or combines multiple signals of the same frequency). A combiner merges multiple signals of different frequencies into one output. Power dividers have equal power split relationships between ports; combiners have frequency-selective combining relationships.

2. What does 60dB isolation deliver in the field?

Higher isolation means less signal leakage between ports. In multi-carrier co-location, insufficient isolation lets one carrier’s strong signal leak into another carrier’s path, pass through that carrier’s amplifier, generate intermodulation products, and fall into the receive band — causing receiver desensitization. Users experience dropped calls. 60dB isolation limits leakage to one-millionth of the original signal, largely eliminating this problem.

3. How is -160dBc PIM measured?

Two signal generators produce two 43dBm (20W) CW carriers at both ends of the target band. After passing through the combiner, a spectrum analyzer measures third-order intermodulation power at 2×f1 – f2. -160dBc means IM3 power is 160dB below the carriers — 100 million times lower.

4. Is 1.2dB insertion loss good?

For a 4-way combiner, ≤1.2dB is solid. Typical 4-way wideband combiners run 2-3dB. Lower loss means more ERP at the antenna for the same RRU output — better coverage distance, or smaller RRUs for the same coverage (less power, less cost).

5. Only one output. How do I feed multiple antennas?

The combiner handles combining only. If you need to feed multiple antennas after combining, add a power divider after the combiner. For a site with three antennas covering different areas, put a 1-to-3 divider after the combiner.

6. Does MS TELERF manufacture this product?

Yes. MS TELERF’s ISO 9001-certified Singapore factory handles design, production, and testing. Four cavity filters are tuned individually, then assembled into the final unit. Every unit goes through 100% full-parameter testing (insertion loss, isolation, VSWR, PIM) before shipment.