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hese sapphire gigatrimmers have been selected from different types for their excellent features. Our aim is to propose 3 types with very good performances, which are better than other gigatrimmers and really offer top quality for RF and microwave applications.
Sapphire is the best material for: Insulation, heat dissipation and Q in microwave applications. It is completely chemically inert and has a very low moisture absorption value, which is even better than that of aluminium oxide.
Even though it is very 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|
Very high Q, about 2-3 times higher than other gigatrimmers, they are suitable for low noise VCO and oscillators up to X-band (12 GHz for model CVG-Z5 27263).
Considerable applicable power ex. 50 W / 2 GHz tanks for sapphire isolation and 500 V work (1000 V test and 1500 V break), very good for medium power matching, they are often used on the last TX stage in 1.9 GHz mobile base station with 50 W
NP0 very high thermal stability, they are suitable for trimming in oscillators, OCXO thermostats working at high temperatures (+70°C/+90°C).
They are easy to mount, this type of enclosure is perfect for PCB mounting, for easy tuning the rotor touching the screwdriver is soldered directly to the ground
Very small size and very fine tuning resolution with multiturn control.
It is suitable for military specifications MIL STD 202E and C-14409.
Sapphire variable capacitor, 0.3 - 1.2 pF, 500V|
|Conditions:||N- (The product is brand new but it comes from an old production)|
|Min. capacitance :||0.3 pF|
|Max. capacitance :||1.2 pF|
|Rated voltage:||500 V|
|Q @ Freq.:||> 5000 @ 250 MHz|