Hi,
I am an Electrical Engineer practicing for last 8 years in an R&D Organization. I have designed a number of products ranging from RF & Microwave circuits to digital circuits. i have experience in designing filters, couplers, LNAs, Amplifiers, antennas, sweep generators, function generators, VCOs, NCO and many more in the frequency range of DC to 2 GHz. i use ADS, HFSS, OrCAD, Eagle PCB and Altium for the design and development of the above mentioned products.
I have designed circuits for Filters, Couplers, LNA, Amplifiers, Antennas, Bluetooth, WiFi, GSM, GPS, Sweep Generators, Function Generators, VCOs, NCOs, DDS, 555 timers, AM Modulators, Microcontrollers, EEPROM, Flash, Accelerometers, USB, RTC, Strain Guages, Opto-couplers etc.
I have designed several similar boards that are used as GPS Tracker applications. One such device i designed is a pet tracker that is round in shape as you have shown in attached figure and the size is similar to a necklace and it has PCB Trace antenna alongwith CR2032 Battery pack as well.
I can share with you images or samples of all my previous work or any particular device you are interested in. Please leave me a message if you want to have a look at my work samples.
Looking forward to discuss in detail.
Regards