Patent ID: 9588167
Date: 2017-03-07
CPC Classifications: G01R,H04B

Claim:
1. A receiver comprising: an internal antenna installed on a substrate and configured to receive a wireless signal; an external antenna connected to a connector, which is arranged on the substrate, and configured to receive the wireless signal; a demodulator arranged on the substrate and configured to demodulate the wireless signals received through the internal antenna and the external antenna; an applying circuit arranged on the substrate and configured to apply a voltage to the external antenna via the connector; and a disconnection detector arranged on the substrate and configured to detect whether the external antenna is disconnected based on a voltage or current applied by the applying circuit, wherein the internal antenna forms a part of the applying circuit, the applying circuit includes a first path in which a first circuit and a second circuit are connected in series via the connector, and a second path connected in parallel to the first path, the first circuit includes the internal antenna and a first resistor connected in series to the internal antenna, the second circuit includes the external antenna and a second resistor connected in series to the external antenna, the first path includes a connection line which connects the internal antenna and the connector and which is set to a high impedance state, and the disconnection detector is arranged in the second path.