Hello,
I'm trying to implement an active GPS antenna for my sim808 in order to integrate it in a PCB im working on it.
for now i use ordinary antennas from amazon in my pcb.
could any one please help me with a tested schematic or guide me to achieve my goal.?
dead group
How much experience do you have in antenna and RF PCB design ?
(as in how many months or years)
Hello beetryx_wolf
Take some time and visit your local amateur radio club to get some ideas.
literally 0, I just know some basics.. I'm a power engineer my telecommunication skills are very limited. i design PCBs related to IoT.. wifi .. mqtt .. but never dealt with RF PCBs
If i had such club i wouldn't ask you
What does the documentation for that antenna tell you about the electronics necessary to use it? There are several active GPS antennas available. DId you choose the one easiest to interface to an Arduino?
Unfortunately, PCB antenna design requires advanced training, and expensive test equipment is required to tweak trial designs so that they actually work as intended.
TI has some application notes covering a few standard designs, for example https://www.ti.com/lit/an/swra117d/swra117d.pdf
GPS active antenna for sim808.
power 4.2v, impedance 50 ohm.. frequency 1572Mhz.. what else information you need?
I have no idea about the LNA or the filtering used.. I tried to reverse engineer the schematic of my antenna
.. it uses AT2659S with some inductors, caps, and resistors but the result didn't work for me. that's why I'm asking for a tested circuit.
If you have no experience of RF PCB design, then I doubt a few tips from this forum will help much.
As @jremington suggested RF PCB design of the type you want is not straight forward.
Most all people wanting an active antenna for a GPS would just buy one, given the issues of designing and developing your own.
If this is for a commercial product maybe ask in the 'Jobs and Paid Consultancy' forum.
Mr srnet, I'm not trying to invent a "new GPS".. im just asking if there exist a tested one or a datasheet that includes the circuit diagram of any ordinary gps that would work with SIM808!!!
I know that type of information is available. My late company built thousands of GPS receivers using active antennas that we bought from China. They were about $5 to $6 US dollars each in reels of 1,000.
They had a patch antenna on top and a load of electronics under the antenna. I know because one of the antennas came loose in the convection soldering oven and we could see what was inside the Chinese units.
I suspect the output of the active antenna was a RF signal of a much lower frequency that still needed to be converted to a conventional data signal. There was a lot of circuitry on the customer's circuit board.
Your other topic on the same subject deleted.
Please do not duplicate your questions as doing so wastes the time and effort of the volunteers trying to help you as they are then answering the same thing in different places.
Please create one topic only for your question and choose the forum category carefully. If you have multiple questions about the same project then please ask your questions in the one topic as the answers to one question provide useful context for the others, and also you won’t have to keep explaining your project repeatedly.
Repeated duplicate posting could result in a temporary or permanent ban from the forum.
Could you take a few moments to Learn How To Use The Forum
It will help you get the best out of the forum in the future.
Thank you.
any "real" answer?
Not your exact use case, but I found a lot of GPS antenna design insights can be found here: Easy Way to Design a PCB for the Ublox Neo-7m GNSS / GPS Module.
This design guide is has awesome info on GPS antenna/RF design:
GNSS antennas
See ya',
Sean
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