RADIO FREQUENCY SWITCH AND APPARATUS CONTAINING THE RADIO FREQUENCY SWITCH

• US 20100073112A1
• Filed: 02/04/2008
• Published: 03/25/2010
• Est. Priority Date: 02/05/2007
• Status: Active Grant

• Current Assignee: Kespion Company Limited
• Original Assignee: Emw Co., Ltd.
• Inventors: Choi, Bong Suk, Sung, Won Mo, Ryou, Byung Hoon, Park, Chang Hyun, Shin, Dong Ryul
• Granted Patent: US 8,149,071 B2
• Time in Patent Office: Days
• US Class Current: 333/262
• CPC Class Codes: H01P 1/15 by semiconductor devices

Abstract

The present invention relates to A radio frequency (RF) switch and an apparatus including the RF switch. In an aspect of the present invention, an RF switch includes a transmission line having one end connected to an input terminal or an output terminal and the other end connected to a signal line and configured to transfer an RF signal, and a diode disposed between the input terminal and the transmission line or between the output terminal and the transmission line, the diode being configured to control whether or not to transmit the RF signal. In another aspect, an RF switch includes a transmission line having one end connected to an input terminal and the other end connected to an output terminal, and a diode disposed between the input terminal and the transmission line or between the output terminal and the transmission line, the diode being configured to control whether or not to transmit the RF signal. Here, a CRLH (Composite Right/Left-Handed) transmission line is employed as the transmission line.

Claims

1. A radio frequency (RF) switch that switches an input and output of an RE signal, the RF switch comprising:

a transmission line having one end connected to an input terminal or an output terminal and the other end connected to a signal line, transmission line being configured to transmit the RE signal; and

a diode disposed between the input terminal and the transmission line or between the output terminal and the transmission line, the diode being configured to control whether or not to transmit the RF signal,

wherein a CRLH (Composite Right/Left-handed) transmission line is employed as the transmission line.

3. The RF switch of claim 1, wherein the CRLH transmission line comprises at least one cell that can be equalized through a combination of a RH transmission line including two serial inductors and a parallel capacitor, and a LH transmission line including two serial capacitors and a parallel inductor.

4. The RF switch of claim 3, wherein:

the RH transmission line generates a positive phase delay at a high frequency band with respect to an input signal, and the LH transmission line generates a negative phase delay at a low frequency band with respect to the input signal.

5. The RF switch of claim 1, wherein the CRLH transmission line has an absolute value of phase delay of 90 degrees with respect to two or more frequencies.

6. The RF switch of claim 1, wherein the diode has one end connected to the transmission line and the other end connected to a ground.

7. The RF switch of claim 1, wherein the diode has one end connected to the input terminal or the output terminal and the other end connected to the transmission line.

2. An RF switch that permits transfer of an RF signal between an input terminal and an output terminal, the RF switch comprising:

a transmission line having one end connected to the input terminal and the other end connected to the output terminal; and

a diode disposed between the input terminal and the transmission line or between the output terminal and the transmission line, the diode being configured to control whether or not to transmit the RF signal,

wherein a CRLH transmission line is employed as the transmission line.

8. An apparatus comprising a radio frequency switch that switches an input and output of an RF signal, the RF switch comprising:

a transmission line having one end connected to an input terminal or an output terminal and the other end connected to a signal line, transmission line being configured to transmit the RF signal; and

a diode disposed between the input terminal and the transmission line or between the output terminal and the transmission line, the diode being configured to control whether or not to transmit the RF,

wherein a CRLH (Composite Right/Left-handed) transmission line is employed as the transmission line.