Quardpulexer B3+B8
A Quadruplexer or Quardpulexer B3+B8 is a specialized RF filter used to combine or separate Transmit (Tx) and Receive (Rx) signals for two different frequency bands —Band 3 (B3 1800 MHz) and Band 8 (B8 900 MHz) —allowing them to share a single antenna feeder or port.
Description
Description
Quardpulexer B3+B8
A Quardpulexer B3+B8 or Quadruplexer B3+B8 is a specialized RF filter used to combine or separate Transmit (Tx) and Receive (Rx) signals for two different frequency bands — Band 3 (B3 1800 MHz) and Band 8 (B8 900 MHz) — allowing them to share a single antenna feeder or port.
| Item4 | RX1 | TX1 | RX1 | TX2 |
| Frequency (MHz) | 880-915 | 925-960 | 1710-1785 | 1805-1880 |
| Insertion loss | ≤2.0 | |||
| Intersection suppression (MHz) | ≥40 | |||
| Isolation (dB） | ≥80dB@ | |||
| VSWR | ≤1.3 | |||
| Impedance (Ω) | 50 | |||
| Power (W) | 40W (avg.) 200W（peak） | |||
| Operation temperature | -20°C ～ +55°C | |||
| Dimension, mm | 198*80*72 | |||
| Connectors | SMA-F | |||
| HT part code | 9008141520 | |||
The Table of Specification of Quardpulexer B3+B8
Technical Function and Description for Quardpulexer B3+B8
In modern 4G and 5G networks, a Quardpulexer B3+B8 enables Carrier Aggregation and minimizes site equipment by consolidating low-band (900 MHz) and mid-band (1800 MHz) signals into one path.
- Filter Type: It typically uses steep-rejection filtering technologies, such as Bulk Acoustic Wave (BAW) or Surface Acoustic Wave (SAW), to ensure that high-power transmit signals do not interfere with sensitive receive paths across different bands.
- DC/AISG Support: Most units include a DC/AISG bypass to allow the base station to control Remote Electrical Tilt (RET) motors or power Tower Mounted Amplifiers (TMA) through the same RF cable.
- Isolation: Designed with high port-to-port isolation (typically >50 dB) to prevent Passive Intermodulation (PIM) and desensitization of the receivers.
Technical Specifications for Quardpulexer B3+B8
General specifications for an industrial-grade Quardpulexer B3+B8 (such as those used in the Ericsson Radio System) are outlined below:
| Feature | Band 8 (900 MHz) | Band 3 (1800 MHz) |
|---|---|---|
| Uplink (Rx) Frequency | 880 – 915 MHz | 1710 – 1785 MHz |
| Downlink (Tx) Frequency | 925 – 960 MHz | 1805 – 1880 MHz |
| Insertion Loss | Typical: 0.3 dB – 0.5 dB | Typical: 0.3 dB – 0.6 dB |
| Isolation | > 50 dB (between bands) | > 50 dB (between bands) |
| Power Handling | Up to 160W – 200W per port | Up to 160W – 200W per port |
| PIM (3rd Order) | ≤ -155 dBc to -160 dBc | ≤ -155 dBc to -160 dBc |
| Return Loss | > 18 dB | > 18 dB |
The Table of Features of Quardpulexer B3+B8
Mechanical and Environmental Characteristics
- Ingress Protection: Usually rated IP67 for outdoor tower-mounted environments.
- Temperature Range: Designed to operate between -40°C and +65°C.
- Connectors: Often utilizes 4.3-10 or 7/16 DIN female connectors for low PIM performance.
- Mounting: Flexible options for pole, wall, or mast installation using stainless steel brackets.
Application in Ericsson Systems
While standalone quadplexers exist, Ericsson often integrates these capabilities into multi-band radios to reduce site complexity. For example, the Radio 6626 and Radio 4499 are designed to support multi-band combinations (like B1+B3 or B8+B20) natively without external filtering. Standalone quadplexers are typically used when combining legacy single-band radios onto a new multi-band antenna
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