I'm trying to make something that you wear on your arm that is connected to a voltage generator that I can remotely turn on. So far I've been using an RF relay, but they casing is too bulky and it just gets in the way. the casing is 2 centimeters tall but I want it to be 1 centimeter tall. is it possible to get a relay that small? and if so where would I buy it. If it is not possible, what would I do instead? is it possible to remotely turn something on and of without using a relay? and would it be around 1 centimeter?

 

I'm trying to make something that you wear on your arm that is connected to a voltage generator that I can remotely turn on. So far I've been using an RF relay, but they casing is too bulky and it just gets in the way. the casing is 2 centimeters tall but I want it to be 1 centimeter tall. is it possible to get a relay that small? and if so where would I buy it. If it is not possible, what would I do instead? is it possible to remotely turn something on and of without using a relay? and would it be around 1 centimeter?

Are you talking about an RF remote control receiver?

 

You don't specify the frequency, bandwidth, impedance, required switch isolation, switch type, switching speed, RF power handling, Intercept-point, etc., so it is very difficult to answer such a broad question. However, since you did specify a "relay", I presume you need a bi-directional RF switch of some sort.

A CMOS transistor can be used as an RF bi-directional switch provided you choose your part very carefully. Also look into Analog Switch and/or Analog Multiplexer IC's, there are lots of options. Recently there was an article posted on AAC here titled "Bridging the Gap Between Solid-State and Mechanical: The MEMS Switch" here:

https://www.allaboutcircuits.com/te...n-solid-state-and-mechanical-the-mems-switch/
https://www.allaboutcircuits.com/te...n-solid-state-and-mechanical-the-mems-switch/
I don't think MEMS RF switch technology is ready for a Human-wearable device right now, but the future looks bright in my opinion. Do read my Comment included in the above-linked MEMS RF switch article for some pros-and-cons about the technology today.

A venerable low-cost analog switch/mux/demux part that comes to mind is the Fairchild FST3253. There are analog switch parts that go to much higher frequencies compared with the FST3253 from the likes of Analog Devices Inc., Hittite, Peregrine Semiconductor (etc.) Take a look here as a start:

http://www.analog.com/en/products/switches-multiplexers/rf-switches.html

Enjoy, David

 

Teledyne used to make RF relays in TO-5 cases.

 

Hello,

@SLK001 , like these of HI-G, I have here?


Bertus

 

Hello, SLK001, like these of HI-G, I have here?

Bertus

Basically just like the ones you have. I have a bunch of Teledynes like these, but I have forgotten the freq specs.