obliczanie pojemnosci kondensatora wlasnej roboty

. Fig. 2-9 - A multiplc-plate capacitor. Altcrnate plates are connected together.

stackcd to form the equivalent of a single large piąte of the same total area. Also, all plates, except the two on the ends, are expo$ed to plates of the other ęroup on both sides, and so are twice as effectivc in incrcasing the capacitancc.

Tlte formula for calculating capacitance is:

C* 0.224 KA (_n- i)

, wherc C = Capacitance in pF.

/ K * Diclectric constant of materiał between - plates

A « Area of one side of one platc in sąuare łnches

d ° Separation of platc surfaccs in inches n “Numbcr of plates

If the plates in one group do not have the same area as the plates in the other, usc the area of the smaller plates.

TABLE 2*111

Didcctric Constants and Brcakdown Yoltagcs

	Dieiectric	Punc turę
Materiał	Constant*	Vo!tage**
Air	1.0
ALsimag 196	5.7	240
BakcUtc	4.4-5.4	300
Bakclite, mica*filled	4.7	325-375
Cfellulosc acctatc	3.3-3.9	250-600
Fiber	5-7.5	150-180
Formie a	4.6-4.9	450
Glass, win do w	7.6-8	200-250
Glass, Pyrex	4.8	335 '
Mica, ruby	5.4	3800-5600
MycaJex	7.4	250
Paper, Royalgrey	/ 3.0	200
Plexiglass	2.8	990
Polycthylene	2.3	1200
Polystyrene	2.6	500-700
Porcelain	5.1-5.9	40-100
Quaitz, fiixed	3.8	1000
Stcalite, low-loss	5.8	150-315
Teflon	2.1	1000-2000

* At 1 MHz •* In volts per mil (0.001 inch)