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5 – 9 GHz (standard; extended 2 – 18 GHz*) |
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Up to ~60 GHz** (fundamental mode limit) |
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Hand‑held tunable magnet (external bias recommended > 18 GHz) |
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Low‑/moderate‑loss ferrite spheres |
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D < 0.6 mm |
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VNA (e.g., PNA‑X N5245A) or Q‑Meter |
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Room temperature |
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* Extended 2 – 18 GHz operation via spacer sleeves and cavity support changes. ** Cavity acts as a mechanical holder up to ~60 GHz; operation beyond 18 GHz requires stronger magnetic bias (e.g., external magnet).
In a typical test, the magnetic‑plasmon‑resonance (MPR) of the ferrite sphere is tracked while sweeping the tunable magnet. The system records the resonance frequency and Q‑factor, and dedicated electrodynamic‑model‑based software compares the responses to extract the intrinsic ferromagnetic linewidth ΔH with high repeatability.
Overview
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