The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 02, 2013
Filed:
Nov. 06, 2009
Jinsung Yi, Daejoon, KR;
Jinsung Yi, Daejoon, KR;
Phychips Inc., , KR;
Abstract
The present invention is directed to reducing leakage of a transmitting signal to a receiving unit in a wireless communication system with a transmitting unit and the receiving unit sharing an antenna. A coupling apparatus for dividing a radio frequency (RF) transmitting signal and an RF receiving signal in a transceiver with a transmitting unit and a receiving unit sharing an antenna, includes: a four-port circuit having port, port, port, and port, a through path being formed between the portand the port, a first signal input to the portbeing coupled to the port, a second signal input to the portbeing coupled to the port, and an isolation path being formed between the portand the portand between the portand the port; and an attenuator attenuating and outputting a signal output from the portof the four-port circuit, and the RF transmitting signal is input to the portof the four-port circuit, the RF receiving signal is input to the portof the four-port circuit, and outputs of the attenuator and the portof the four-port circuit are provided the receiving unit. Leakage of a transmitting signal of a transmitting unit to a receiving unit in a communication system sharing an antenna can be isolated. Furthermore, an isolation effect of a leakage signal of a transmitting unit to a receiving unit can be maximized while adaptively changing an attenuation value of a variable attenuator.