I am not quite understand how the microstripline which is divided by dielectrical material to connect between the signal and ground....how does it really works and why is it able to keep signal stable?

Secondly how do they lock certain frequency in a circuit for example 2.4 Ghz?
Thirdly why do they need buffer in case cases is it to allow the signal build up before releasing to create the shunt wave?

 

The geometry of a stripline provides a distributed series inductance and distributed shunt capacitance. It forms an impedance controlled transmission line from a source to a load. Would you rather use sections of coaxial cable to connect subsystems on a board. You could do it but it would be a pain (ITA).

 

Secondly how do they lock certain frequency in a circuit for example 2.4 Ghz?

What do you mean by "lock"?

Thirdly why do they need buffer

One reason is to drive the low characteristic impedance of a transmission line which is usually in the region of 50 to 120Ω depending upon the line geometry.

 

I am not quite understand how the microstripline which is divided by dielectrical material to connect between the signal and ground....how does it really works and why is it able to keep signal stable?

Microstrip does nothing to keep the signal stable. There are plenty of unstable μstrip circuits.

Secondly how do they lock certain frequency in a circuit for example 2.4 Ghz?

μstrip is designed using the main frequency wanted - although some μstrips are resonant, they do not lock onto that frequency.

Thirdly why do they need buffer in case cases is it to allow the signal build up before releasing to create the shunt wave?

Like crutschow says, buffers are used to isolate (buffer) on part of the circuit from another. As for the rest of your question, I have no idea what you are talking about. What is a "shunt wave"?

 

Like crutschow says, buffers are used to isolate (buffer) on part of the circuit from another. As for the rest of your question, I have no idea what you are talking about. What is a "shunt wave"?

-- to push the wave or to transmit

 

The geometry of a stripline provides a distributed series inductance and distributed shunt capacitance. It forms an impedance controlled transmission line from a source to a load. Would you rather use sections of coaxial cable to connect subsystems on a board. You could do it but it would be a pain (ITA).

Can we just use two inductors where one is to transmit and another to receive...between is air (no diaelectrical material) to connect the two its just received by the second inductor through wave transmitted to the air by the first inductor

 

Can we just use two inductors where one is to transmit and another to receive...between is air (no diaelectrical material) to connect the two its just received by the second inductor through wave transmitted to the air by the first inductor

Yes.
It's call an air core transformer.

 

Can we just use two inductors where one is to transmit and another to receive...between is air (no diaelectrical material) to connect the two its just received by the second inductor through wave transmitted to the air by the first inductor

Depends on the frequency. Traditional air core inductors don't work well in the GHz. frequency range.

 

Depends on the frequency. Traditional air core inductors don't work well in the GHz. frequency range.

There is one strange behavior that i notice from the air core experiment ...using the active crystal oscillator and it goes like this.

Using 20 Mhz crystal oscillator to generate the frequency and goes through the air core inductor and then using frequency counter to measure the frequency at the output end it read 20 Mhz which is logical....but..when i measure the frequency on the a certain distance away from the inductor for example 5 cm away (not touching the inductor) it reads around 1.5 Ghz...if goes further distance the frequency is going down and goes away...and when getting closer to the inductor it gradually goes back to 20 Mhz..

Now my question is why at certain distance in this case 5 cm away from the inductor it measures around 1.5 Ghz very very strange..is this why the coaxial or the microstripline does not connect directly between signal and ground and thus using dielectrical material in between?

 

Thanks all for the input and ideas - I think i get it how to make the microstripline using an alternative coaxial cable easily ...i am excited to build the most consistent RF booster for my 4G LTE internet now. Cheers!!! Life is an experiment wooohooo...

My result best i can achieve thus far...i am looking for full 5 bar signal improvement that will consistently run at 90% without going down.