Finding the Right RF VHF Diode for GSM Signal Amplification

[ramonegumpert]

Dear Experts,

I am looking for some rf vhf diodes.
could you recommend a particular model for me?

I am quite new to this diode.
Are these synonymously called microwave diode / MOSFET / rectifiers / field effect transistor?

I am confused what should be the right diode to amplify gsm signals.

regards
Ramone

 

[Averagesupernova]

There are many diodes that work at VHF. But, there are also many vairious ways to configure them functionally which will require different types of diodes. So what do you want to do?

 

[Studiot]

It would be a good idea to specify the frequency you are aiming at.

VHF is nowhere near microwave frequency by an order of magnitude.

 

[davenn]

Dear Experts,
I am looking for some rf vhf diodes.
could you recommend a particular model for me?
I am quite new to this diode.
Are these synonymously called microwave diode / MOSFET / rectifiers / field effect transistor?
I am confused what should be the right diode to amplify gsm signals.
regards
Ramone

for a start diodes DONT amplify a RF signal (GSM or otherwise)

transistors of the Bipolar, MOSFET or GaAsFET variety do

As other have said, we need to know what freq's you are interested in as many transistors have relatively narrow bandwidth, so a specific type of device needs to be picked for best operation at your freq of interest

It may also be an idea if you tell us what you are trying to achieve so that we can get you onto the right path. But if you don't know what a diode is and probably not a transistor then you may have much reading and learning to do before you can start on your endevour :)


cheers
Dave

 

[ramonegumpert]

Dear Experts,

The frequency I am playing with is 900 Mhz. I am trying to detect GSM signals to boost the signal for my mobile phone.

Would be very happy if you could suggest some models for these MOSFET etc. To be honest, I have never used any of these before (eg. bipolar transistor, GaAsFET etc).

I have only used normal npn transistors, voltage comparators, resistors , capacitors and normal diode before.

Wish you a nice day ahead.

regards
Ramone

 

[davenn]

Hi Ramone,

I never claim to be an expert :)

on for receiver signal boosing you can use a basic preamplifier circuit like a ERA1, GALI-84 or similar MMIC like shown on this page
http://www.minikits.com.au/kits2.html#gali39

But 3 things to think about
1) it isn't going to fit into your probably small handheld phone
2) you cannot transmit through it, you would have to separate out the receiver and transmit lines in the phone and have them relay or pin diode switched to an antenna.
3) you mite amplify the receive signal so you can hear a signal, but if the transmit isn't amplified as well then you are not going to get back to the cellphone tower.

in general its going to be a really tricky job... not impossible but not for some one with little or no knowledge in extremely small surface mount device RF electronics
ideas always sound easy in theory, once you have a good understanding of electronics you suddenly realize its not just a matter of soldering a few wires and components together

its something we see on electronics forums all over the net. so many people wanting to do quite complex projects when they don't really have any electronics experience

I don't want to sound too negative towards you, but you do need to understand the complexity of what you are wanting to achieve :)

cheers
Dave

PS ... it may be possible that just using an external hi gain antenna may help you out
this would be ok if you are able to make use of it whilst not moving around
A lot of phones still have an input connector for an external antenna