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Circulator Temperature Drift: Why Isolation Fails at -40°C to +85°C
Sep , 15 2026
A circulator's isolation fails to hold 20dB over a wide temperature range because the ferrite's saturation magnetization (4πMs) changes with temperature. This shifts the device's operating frequency and impedance match. A circulator rated at 20dB isolation at room temperature can drop to 15dB or lower at -40°C or +85°C. This is not a design flaw — it is the physical nature of ferrite materials. Th...
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Three 10dB Couplers Compared: Insertion Loss and PIM Test Results – Cavity vs Microstrip vs Stripline
Sep , 29 2026
In DAS indoor distribution systems and RF link designs, the 10dB directional coupler is one of the most frequently used passive components. The two specifications engineers care about most are insertion loss and passive intermodulation (PIM) — the former directly eats into the link budget, the latter determines whether the uplink noise floor can be kept down. There are three main manufacturing tec...
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