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These sapphire gigatrimmers have been selected among various types for their outstanding qualities. Our purpose is to suggest 3 types with very good performances better than other gigatrimmers and really top quality for RF and microwave applications.
Sapphire is the best material for: insulation, heat dissipation and Q in microwave performances. It is chemically completely inert with a very low moist absorption value, it is even better than alumina.
Even if is really small it is often used for high power applications.
|Comparison chart among the best microwave materials|
|Sapphire||Alumina AL2O2||Quartz SiO2||Pure Teflon|
|Dielectric constant εr||about 11||about 10||about 3.8||about 2,05|
|dissipation factor tanδ @ 10GHz||< 0,0001||0,0002||0.0015||0.0003|
|Thermal dissipation||very good||good||average||poor|
Most important applications:
Sapphire variable capacitor, 0.3 - 1.2 pF, 500V|
|Conditions:||N (The product is brand new)|
|Min. capacitance:||0.3 pF|
|Max. capacitance:||1.2 pF|
|Rated voltage:||500 V|
|Q @ Freq.:||> 5000 @ 250 MHz|