Device and method for unambiguous determination of angle of arrival for RF signals

A device for determining an angle of arrival of a received RF signal, the device comprising:

• a first antenna and a second antenna arranged with a predetermined distance between them on an antenna axis, the first antenna having a larger gain than the second antenna for directions corresponding to one side of the antenna axis, the second antenna having a larger gain than the first antenna for directions corresponding to the other side of the antenna axis;
• receiver circuitry coupled to the first antenna and to the second antenna, the receiver circuitry being configured to determine a first phase and a first signal strength of a signal received by the first antenna and to determine a second phase and a second signal strength of a signal received by the second antenna;
• angle determining circuitry configured to determine the angle of arrival based on the first phase, the second phase, the first signal strength, and the second signal strength;
• wherein the first antenna is a directional antenna having a first gain for directions corresponding to the one side of the antenna axis and a second gain for directions corresponding to the other side of the antenna axis, the first gain being larger than the second gain;
• and
• wherein the second antenna is an omnidirectional antenna having a gain that is less than the first gain of the first antenna and greater than the second gain of the first antenna.