1. A mass production system for synthesized carbon nanotubes, comprising:
a reaction chamber having at least one opening opened to external air all the time, and at least one different-specific gravity gas occupying region filled with a different specific gravity gas having a different specific gravity from that of the external air to block the external air from being introduced into the reaction chamber through the opening;
a carbon nanotube synthesizing unit positioned in the different-specific gravity gas occupying region to synthesize carbon nanotubes by the medium of a catalyst introduced thereto through the opening;
a conveying unit to convey the catalyst to the carbon nanotube synthesizing unit through the opening; and
a gas supply unit to supply the different specific gravity gas and a carbon source gas used for synthesizing the carbon nanotubes to the different-specific gravity gas occupying region and the carbon nanotube synthesizing unit, respectively,
wherein the opening is opened downward to the external air all the time,
wherein the different specific gravity gas that fills the different-specific gravity gas occupying region has a specific gravity lower than that of the external air, and
wherein the reaction chamber having the opening opened downward and the different specific gravity gas with the specific gravity lower than that of the external air are configured for contacting all the time but keeping the external air from being introduced into the reaction chamber through the opening so as to trap the different specific gravity gas with the specific gravity lower than that of the external air in the different-specific gravity gas occupying region;
wherein the opening comprises an inlet through which the catalyst is introduced into the reaction chamber, and an outlet through which the carbon nanotubes synthesized by the carbon nanotube synthesizing unit are discharged to an outside of the reaction chamber, and
the conveying unit conveys the catalyst andor the carbon nanotubes via the opening, the different-specific gravity gas occupying region, the carbon nanotube synthesizing unit, and the outlet;
wherein the different-specific gravity gas occupying region comprises a first occupying region communicated in a direction traversing the direction of gravity, a second occupying region communicated between the inlet and the first occupying region, and a third occupying region communicated between the outlet and the first occupying region,
the reaction chamber being bent at the inlet and the outlet thereof so as to define the first occupying region, the second occupying region, and the third occupying region therein;
wherein the inlet and the outlet have a positional difference with respect to the first occupying region in the direction of gravity in order to prevent the different-specific gravity gas filled in the different-specific gravity gas occupying region from being discharged to the outside of the reaction chamber through the inlet and the outlet due to gravity;
wherein the carbon nanotube synthesizing unit comprises:
a reaction region defined in the reaction chamber while being blocked from the external air by the different-specific gravity gas filled in the different-specific gravity gas occupying region;
a carbon source gas injector to inject the carbon source gas supplied from the gas supply unit to the reaction region such that the catalyst conveyed into the reaction region by the conveying unit reacts with the carbon source gas, thereby synthesizing the carbon nanotubes; and
a heating member to heat the reaction region;
wherein the different-specific gravity gas comprises a gas having a lower specific gravity than that of the external air, and the inlet and the outlet are located lower than the first occupying region in the direction of gravity in order to prevent the different-specific gravity gas from being discharged to the outside of the reaction chamber through either the inlet or the outlet due to gravity.
2. The mass production system according to claim 1, wherein the different-specific gravity gas is hydrogen gas having the lower specific gravity than that of the external air.
3. A mass production system for synthesized carbon nanotubes, comprising:
a reaction chamber having at least one opening opened to external air all the time, and at least one different-specific gravity gas occupying region filled with a different specific gravity gas having a different specific gravity from that of the external air to block the external air from being introduced into the reaction chamber through the opening;
a carbon nanotube synthesizing unit positioned in the different-specific gravity gas occupying region to synthesize carbon nanotubes by the medium of a catalyst introduced thereto through the opening;
a conveying unit to convey the catalyst to the carbon nanotube synthesizing unit through the opening; and
a gas supply unit to supply the different specific gravity gas and a carbon source gas used for synthesizing the carbon nanotubes to the different-specific gravity gas occupying region and the carbon nanotube synthesizing unit, respectively,
wherein the opening is opened downward to the external air all the time,
wherein the different specific gravity gas that fills the different-specific gravity gas occupying region has a specific gravity lower than that of the external air, and
wherein the reaction chamber having the opening opened downward and the different specific gravity gas with the specific gravity lower than that of the external air are configured for contacting all the time but keeping the external air from being introduced into the reaction chamber through the opening so as to trap the different specific gravity gas with the specific gravity lower than that of the external air in the different-specific gravity gas occupying region;
wherein the opening comprises an inlet through which the catalyst is introduced into the reaction chamber, and an outlet through which the carbon nanotubes synthesized by the carbon nanotube synthesizing unit are discharged to an outside of the reaction chamber, and
the conveying unit conveys the catalyst andor the carbon nanotubes via the opening, the different-specific gravity gas occupying region, the carbon nanotube synthesizing unit, and the outlet;
wherein the different-specific gravity gas occupying region comprises a first occupying region communicated in a direction traversing the direction of gravity, a second occupying region communicated between the inlet and the first occupying region, and a third occupying region communicated between the outlet and the first occupying region,
the reaction chamber being bent at the inlet and the outlet thereof so as to define the first occupying region,
the second occupying region, and the third occupying region therein;
wherein the inlet and the outlet have a positional difference with respect to the first occupying region in the direction of gravity in order to prevent the different-specific gravity gas filled in the different-specific gravity gas occupying region from being discharged to the outside of the reaction chamber through the inlet and the outlet due to gravity;
wherein the carbon nanotube synthesizing unit comprises:
a reaction region defined in the reaction chamber while being blocked from the external air by the different-specific gravity gas filled in the different-specific gravity gas occupying region;
a carbon source gas injector to inject the carbon source gas supplied from the gas supply unit to the reaction region such that the catalyst conveyed into the reaction region by the conveying unit reacts with the carbon source gas, thereby synthesizing the carbon nanotubes; and
a heating member to heat the reaction region;
wherein the different-specific gravity gas comprises a gas having a higher specific gravity than that of the external air, and the inlet and the outlet are located higher than the first occupying region in the direction of gravity in order to prevent the different-specific gravity gas from being discharged to the outside of the reaction chamber through the inlet and the outlet due to gravity.
4. The mass production system according to claim 2, wherein the carbon source gas injector comprises a plurality of nozzles dispersedly arranged corresponding to a dimension of the reaction region to uniformly inject the carbon source gas into the reaction region.
5. The mass production system according to claim 2, further comprising:
a heating member to heat at least one region inside the reaction chamber to reduce the catalyst introduced into the reaction chamber through the opening.
6. The mass production system according to claim 2, wherein the carbon nanotube synthesizing unit comprises a carbon source restriction part opened upwardly to block the carbon source gas injected into the reaction region from escaping from the reaction region.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An antenna switching circuit capable of coupling a plurality of ports to an antenna, said antenna switching circuit comprising:
a first switch activated by a first control signal for establishing a connection between a first transmit port and said antenna;
a second switch activated by a second control signal for establishing a connection between a second transmit port and said antenna;
a third switch activated by a third control signal for establishing a connection between a first receive port and said antenna;
a fourth switch activated by said third control signal for establishing a connection between a second receive port and said antenna, wherein said first receive port and said second receive port are simultaneously connected to said antenna when said third switch and said fourth switch are activated by said third control signal;
a fifth switch activated by a fourth control signal for establishing a connection between a third receive port and said antenna;
a sixth switch activated by said fourth control signal for establishing a connection between a fourth receive port and said antenna, wherein said third receive port and said fourth receive port are simultaneously connected to said antenna when said fifth switch and said sixth switch are activated by said fourth control signal.
2. The antenna switching circuit of claim 1 further comprising a bias resistor connected across said first transmit port and said second transmit port.
3. The antenna switching circuit of claim 1 wherein said first receive port receives low band signals.
4. The antenna switching circuit of claim 1 wherein said second receive port receives high band signals.
5. The antenna switching circuit of claim 1 wherein said first transmit port transmits high band signals.
6. The antenna switching circuit of claim 1 wherein said second transmit port transmits low band signals.
7. A transmit module for a mobile phone device, said transmit module coupled to an antenna, said transmit module comprising an antenna switching circuit, said antenna switching circuit comprising:
a first switch activated by a first control signal for establishing a connection between a first transmit port and said antenna;
a second switch activated by a second control signal for establishing a connection between a second transmit port and said antenna;
a third switch activated by a third control signal for establishing a connection between a first receive port and said antenna;
a fourth switch activated by said third control signal for establishing a connection between a second receive port and said antenna, wherein said first receive port and said second receive port are simultaneously connected to said antenna when said third switch and said fourth switch are activated by said third control signal;
a fifth switch activated by a fourth control signal for establishing a connection between a third receive port and said antenna;
a sixth switch activated by said fourth control signal for establishing a connection between a fourth receive port and said antenna, wherein said third receive port and said fourth receive port are simultaneously connected to said antenna when said fifth switch and said sixth switch are activated by said fourth control signal.
8. The transmit module of claim 7 further comprising a bias resistor connected across said first transmit port and said second transmit port.
9. The transmit module of claim 7 wherein said first receive port receives low band signals and wherein said second receive port receives high band signals.
10. The transmit module of claim 9 wherein said low band signals are configured in accordance with one of an 850 megahertz GSM band and a 900 megahertz GSM band, and wherein said high band signals are configured in accordance with one of an 1800 megahertz GSM band and a 1900 megahertz GSM band.
11. The transmit module of claim 7 wherein said first transmit port transmits high band signals, and wherein said second transmit port transmits low band signals.
12. The antenna switching circuit of claim 11 wherein said low band signals are configured in accordance with one of an 850 megahertz GSM band and a 900 megahertz GSM band, and wherein said high band signals are configured in accordance with one of an 1800 megahertz GSM band and a 1900 megahertz GSM band.
13. An antenna switching circuit capable of coupling a plurality of ports to an antenna, said antenna switching circuit comprising:
a first switch activated by a first control signal for establishing a connection between a first transmit port and said antenna;
a second switch activated by a second control signal for establishing a connection between a second transmit port and said antenna;
a third switch activated by a third control signal for establishing a connection between a first receive port and said antenna;
a fourth switch activated by said third control signal for establishing a connection between a second receive port and said antenna, wherein said first receive port and said second receive port are simultaneously connected to said antenna when said third switch and said fourth switch are activated by said third control signal
a first control port coupled to a gate of said first switch, said first control port being configured to receive said first control signal;
a second control port coupled to a gate of said second switch, said second control port being configured to receive said second control signal;
a fifth switch activated by a fourth control signal for establishing a connection between a third receive port and said antenna;
a sixth switch activated by said fourth control signal for establishing a connection between a fourth receive port and said antenna, wherein said third receive port and said fourth receive port are simultaneously connected to said antenna when said fifth switch and said sixth switch are activated by said fourth control signal.
14. The antenna switching circuit of claim 13 further comprising a diode having an anode and a cathode, said anode of said diode being coupled to said first control port and said cathode of said diode being coupled to said antenna.
15. The antenna switching circuit of claim 13 further comprising a diode having an anode and a cathode, said anode of said diode being coupled to said second control port and said cathode of said diode being coupled to said antenna.
16. The antenna switching circuit of claim 13 wherein said first receive port receives low band signals and wherein said second receive port receives high band signals.
17. The antenna switching circuit of claim 13 wherein said first transmit port transmits high band signals, and wherein said second transmit port transmits low band signals.