DeltaH cavity

Ferrite Sphere Linewidth Measurement Setup

Parameters

Nominal frequency:	5 GHz (option: 10 GHz*)
Measurement principle:	Mode splitting in cavity–sphere coupling; measure when split modes 1 & 2 are symmetric.
Magnetic bias:	Hand-held tunable magnet
Sample type:	Low-magnetic-loss ferrite spheres
Sample diameter:	D < 1.5 mm (quartz tube holder)
Instrumentation:	VNA (e.g., Keysight PNA-X N5245A) or Q-Meter
Temperature:	Room temperature
Software:	Electrodynamic-model-based extraction of ΔH from split-mode frequency and Q-factor
Measurability examples:	ΔH = 0.2 Oe, D = 0.5 mm, Ms = 1800 Gs → Yes ΔH = 3 Oe, D = 1.4 mm, Ms = 1200 Gs → Yes ΔH = 16 Oe, D = 1.2 mm, Ms = 1700 Gs → Yes ΔH = 20 Oe, D = 1.0 mm, Ms = 1800 Gs → No (no mode splitting)
Full setup: PC with dedicated software + VNA or Q-Meter; strong coupling is required for mode splitting.

* Customizations are possible (e.g., a 10 GHz cavity). The measurement is performed when split modes are symmetric; broad-linewidth samples that do not split cannot be characterized.

Measurement Results

Interior of the aluminum custom‑milled case with isolated chambers, PCB filtering structures and QMeter response

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Test fixtures and setups

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Ferrite Sphere Linewidth Measurement Setup

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