Feeding four antennas from one source sounds simple until a fault on one branch drags the others down with it. A Wilkinson splitter is the engineered answer: it divides power 4 ways with real isolation between the outputs, so each branch stays independent. The SP6938-53A4-4.3 is RFI's second-generation wideband design, covering 698–3800 MHz — every Australian cellular band from 700 MHz through mid-band 5G — on low-PIM 4.3-10 female interfaces.

Product Features:

• 4-way Wilkinson topology — isolated outputs, not a passive tee that couples every fault to every branch.
• Full 698–3800 MHz span: 700, 850/900, 1800, 2100, 2300, 2600 and 3500 MHz in one component.
• Low-PIM construction — the requirement for any path a carrier will connect to.
• 4.3-10 female interfaces, the current DAS and carrier standard.
• Second-generation design; also available in other port counts across the series.

Application Areas:

• Distributing signal to multiple DAS antennas from one head end.
• Combining or splitting between sectors on shared cellular infrastructure.
• Multi-antenna in-building and tunnel coverage systems.

Selection & Installation Notes:

• Every port must see 50 Ω. Terminate any unused output with a matched load — an open port destroys the isolation you paid for.
• Pair with our low-PIM 4.3-10 jumpers to keep the whole path carrier-grade; a good splitter behind a cheap patch lead is wasted money.
• Splitting divides power: a 4-way split costs about 6 dB per branch before losses. Plan the link budget before choosing port count.
• Detailed electrical figures (power, insertion loss, isolation, PIM in dBc) are available from RFI on request — ask us if your specification requires them documented.

Documents:

RFI SP6938-53A4-4.3 Wideband 4-Way Low PIM Wilkinson Splitter/Combiner