1. Construction of Mica Capacitor And Its Application

2. Construction of Mica Capacitor And its Application
Introduction:
A capacitor is called as a condenser and earlier to that named as a Permittor. It is a two terminal passive electrical component, used to store electrical energy in an electric field. There are different kinds of capacitors are available in the market and such one is Mica Capacitors.

3. Construction of Mica Capacitor And its Application
What is a Mica Capacitor?
The term “Mica” is a collection of natural minerals.
Silver mica capacitor is a capacitor that uses the name mica as the dielectric.
These capacitors are classified into two types
Silver mica capacitor
Damped mica capacitor.

4. Construction of Mica Capacitor And its Application
What is a Mica Capacitor?
Silver mica capacitors are used in its place of clamped mica due to their lower characteristics.
Mica capacitors are low loss capacitors which are used where the high frequency is required and their value doesn’t change much over time.

5. Construction of Mica Capacitor And its Application
What is a Mica Capacitor?
These capacitors are constant chemically, mechanically and electrically due to its particular crystalline structure (typical layered structure).
This creates it achievable to produce thin sheets in the order of mm.
The most frequently used micas are Phlogopite mica and Muscovite mica.
The high difference in raw material work leads to high cost required for check & sorting.
Mica doesn’t respond with most acids, oil, water and solvents.

6. Construction of Mica Capacitor And its Application
The construction of Mica Capacitor is so simple.

7. Construction of Mica Capacitor And its Application
Silver Mica Capacitors are made by covering the silver directly on the outside of mica.
Covering this is to obtain the desired capacitance.
After the layers are collected, electrodes are added & the assembly is encapsulated. 
Silver mica capacitors have a comparatively tiny capacitance value (between a few pF, upto a few nF). 

8. Construction of Mica Capacitor And its Application
The largest capacitance capacitors can attain values of 1µF.
Silver mica capacitors are typically rated for voltages between 100 & 1000 volts.
There are particular high-voltage mica capacitors designed for RF TX employ which are rated at up to 10 kV.

9. Construction of Mica Capacitor And its Application
How to Choose the Right Mica Capacitor
When you are selecting the right mica capacitors you can filter the various attribute results so that you will be able to find the right silver mica capacitors.
The following factors should check before choosing this capacitor
Lead Spacing -3.6 mm, 5.9 mm, 8.7 mm, 11.1 mm
Capacitance -2 pF, 22 pF, 47 pF, 100 pF, 470 pF
Rated Voltage-from 50 V to 1 kV

10. Construction of Mica Capacitor And its Application
Characteristics of Mica Capacitor
The characteristics of the mica capacitor include the following
Accuracy and Tolerance
Stability
Low losses

11. Construction of Mica Capacitor And its Application
Characteristics of Mica Capacitor
Accuracy and Tolerance
The values of smallest tolerance of a silver mica capacitor can be as low as ±1%.
This is much superior than almost all other kinds of capacitors.
In contrast, positive ceramic capacitors can include tolerances of up to ±20%.

12. Construction of Mica Capacitor And its Application
Characteristics of Mica Capacitor
Stability
These capacitors are very constant and very precise.
Their capacitance changes small over time.
This is due to the truth that there are no air spaces in the design which might change over time.
Also, the assembly is guarded from other results by an epoxy resin.

13. Construction of Mica Capacitor And its Application
Characteristics of Mica Capacitor
Stability
This means that external effects like air humidity do not involve mica capacitors.
Not only is their capacitance constant over time.
It’s also steady over an ample temperature, voltage & frequency range.
The standard temperature coefficient is around 50 ppm/°C.

14. Construction of Mica Capacitor And its Application
Characteristics of Mica Capacitor
Low losses
These have low inductive and resistive losses.
The characteristics of these capacitors are generally frequency independent.
Which permits for their use of high frequency.
These better characteristics come at a price: silver mica capacitors are large and costly.

15. Construction of Mica Capacitor And its Application
Silver Mica Capacitor Properties
Silver mica capacitors are used frequently due to its features like high level performance, superior in numerous areas than any other kind of capacitor.
The particular properties of the mica capacitor are summarized below.
High accuracy
Temperature co-efficient
Value range
Low capacitance variation with voltage
High Q

16. Construction of Mica Capacitor And its Application
Advantages and Disadvantages of Mica Capacitor
The advantages and disadvantages of mica capacitors mainly include
Stable capacitance.
Operates at high temperatures.
Withstand at very high voltages.
Low losses.
Highly accurate and Dielectric provides good insulation.
High cost and Proper sealing is required.

17. Construction of Mica Capacitor And its Application
Applications for Mica Capacitors
The applications of mica capacitors can be found in a large range of applications including the following
Ripple filter and Decoupling for general electronic devices
Resonant circuits
Coupling circuits
Time constant circuits
High-power RF broadcast transmitters

18. Construction of Mica Capacitor And its Application
Applications for Mica Capacitors
The applications of mica capacitors can be found in a large range of applications including the following
Defense Electronic Devices
Power transfer circuits for low-capacitance snubber applications
Radio or TV transmitters
Cable TV amplifiers
High voltage inverter circuits

19. Construction of Mica Capacitor And its Application
Conclusion
From the above information finally we can conclude that, these capacitors employ mica as the dielectric. They have high frequency properties due to very stable over time, inductive losses and low resistance. Mica capacitors are classified based on the different properties like working voltage, required capacitance and current handling capacity.