RF front-end apparatus in a TDD wireless communication system
First Claim
1. A transmitting apparatus in a time division duplex (TDD) wireless communication system, comprising:
- a circulator for transmitting a signal received from a power amplifier to an antenna feed line and transmitting a signal received from the antenna feed line to a quarter-wave transmission line;
the quarter-wave transmission line installed in a reception path, for reception isolation in a transmission mode; and
a radio frequency (RF) switch for shorting a load of the quarter-wave transmission line to ground or connecting the load of the quarter-wave transmission line to a low-noise amplifier (LNA) according to a control signal;
the LNA for low-noise-amplifying a signal received from the RF switch.
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Accused Products
Abstract
A transmitting apparatus in a TDD wireless communication system is provided. In the transmitting apparatus, a circulator transmits a signal received from a power amplifier to an antenna feed line and transmits a signal received from the antenna feed line to a quarter-wave transmission line. The quarter-wave transmission line is installed in a reception path, for reception isolation in a transmission mode. An RF switch shorts the load of the quarter-wave transmission line to the ground or connects the load of the quarter-wave transmission line to an LNA according to a control signal. The LNA low-noise-amplifies a signal received from the RF switch.
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Citations
23 Claims
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1. A transmitting apparatus in a time division duplex (TDD) wireless communication system, comprising:
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a circulator for transmitting a signal received from a power amplifier to an antenna feed line and transmitting a signal received from the antenna feed line to a quarter-wave transmission line;
the quarter-wave transmission line installed in a reception path, for reception isolation in a transmission mode; and
a radio frequency (RF) switch for shorting a load of the quarter-wave transmission line to ground or connecting the load of the quarter-wave transmission line to a low-noise amplifier (LNA) according to a control signal;
the LNA for low-noise-amplifying a signal received from the RF switch. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A transmitting apparatus in a time division duplex (TDD) wireless communication system, comprising:
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a circulator for transmitting a signal received from a power amplifier to an antenna feed line and transmitting a signal received from the antenna feed line to a predetermined transmission line;
the transmission line connected between the circulator and a radio frequency (RF) switch; and
the RF switch for connecting a load of the transmission line to an open stub of a predetermined length or to a low-noise amplifier (LNA) according to a control signal;
the LNA for low-noise-amplifying a signal received from the RF switch. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A transmitting apparatus in a time division duplex (TDD) wireless communication system, comprising:
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a circulator for transmitting a signal received from a power amplifier to an antenna feed line and transmitting a signal received from the antenna feed line to a predetermined transmission line; and
the transmission line being a predetermined length installed in a reception path, a load impedance of the transmission line being an open-circuit impedance in a transmission mode. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23)
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Specification