Hi all! I'm new in this area so i apologize for some newbie questions that i'm going to ask. So to make a long story short, my first question is how does rotation of the device (GPRS and GPS) influence signal strength (physical model - imagine a cell phone attached to a 10 cm (4 in) long cord on one end and the other end of the cord is in your hand spinning the phone around 200 rounds per minute) ? Does circularly polarized antenna solves the problem ?
yes actually, the antenna of the GPS is circularly polarized to ensure reception of a signal regardless of antenna orientation
but the antenna in new mobiles is not a cord, it is recently a printed antenna (example microstrip antenna) or a dielectric antenna (example ceramic antenna)
in addition to above, the antenna bandwidth must include the frequency of operation of the service (GSM, GPS, etc...) with low mismatches and losses
So, basically, if i design my own GSM device with circularly polarized antenna it will work regardless of relativly fast rotation ? Does speed of rotation (or RPM) have influence on signal strenght?