Patent ID: 8803681

Claim:
A receiver of an object finder, the receiver comprising: an antenna to receive a signal from a transmitter associated with the receiver; a PIN diode having a first terminal coupled with the antenna, and having a resistance that increases as a current flows therethrough decreases, and vice versa; a variable resistor coupled with the first terminal of the PIN diode to control the amount of a current flowing into the PIN diode; a radio frequency integrated circuit (RF IC) having a first pin electrically coupled with the second terminal of the PIN diode to receive the signal from the antenna via the PIN diode; and a micro controller unit (MCU) electrically coupled with a second pin of the RF IC and a second terminal of the PIN diode, and configured to receive data from the RF IC and to extract information on a next transmission time of the transmitter from the data, wherein the MCU is configured to provide a first voltage signal to disable the RF IC, the first voltage signal pulling high a voltage level at the second terminal of the PIN diode, and to provide a second voltage signal to enable the RF IC, the second voltage signal pulling a low voltage level at the second terminal of the PIN diode, and the MCU being configured to enter a sleep mode after the data are received and configured to set a time to wake up from the sleep mode based on the information extracted from the data.