System for transmitting/receiving a signal having a carrier frequency band for a radio base station
First Claim
1. A system for transmitting/receiving an electrical signal, said system comprising:
- a plurality of transmission/reception signal amplifying devices each having a power amplifier, a variable phase shift circuit connected to an input portion of said power amplifier, a power detector connected to an output portion of said power amplifier, and a phase shifting amount table which is constructed on the basis of the characteristics of said power amplifier;
a plurality of antennas which are respectively connected to said transmission/reception signal amplifying devices; and
a tilt angle control circuit which is connected to said transmission/reception signal amplifying devices,wherein each of the outputs of said power detectors is compared with a control signal of said tilt angle control circuit to adjust the phase shifting amount of said variable phase shifting circuits on the basis of the contents of said phase shifting amount table.
1 Assignment
0 Petitions
Accused Products
Abstract
In a system for feeding electric power having a carrier band for a mobile communication base station including transmission power amplifiers and an array antenna, a transmission/reception system is capable of reducing a large loss which the transmission electric power suffers until the transmission electric power having a large output has been radiated into the air, and increase in the power consumption. The system includes a plurality of transmission/reception signal amplifying devices, which are respectively coupled to a plurality of antennas, in each of which a feed forward power amplifier which is realized with less electric power than the total electric power which is to be radiated from the associated antenna into the air, and a low noise amplifier are respectively coupled to the associated antennas through a transmission filter and a reception filter, wherein an output of a power detector connected to an output portion of the feed forward power amplifier is compared with a control signal of a tilt angle control circuit to adjust, every feed forward amplifier, the phase shift amount of a variable phase shift circuit inserted into an output portion of the feed forward power amplifier while referring to a phase shift amount table which is constructed on the basis of the characteristics of the feed forward circuit.
-
Citations
30 Claims
-
1. A system for transmitting/receiving an electrical signal, said system comprising:
- a plurality of transmission/reception signal amplifying devices each having a power amplifier, a variable phase shift circuit connected to an input portion of said power amplifier, a power detector connected to an output portion of said power amplifier, and a phase shifting amount table which is constructed on the basis of the characteristics of said power amplifier;
a plurality of antennas which are respectively connected to said transmission/reception signal amplifying devices; and
a tilt angle control circuit which is connected to said transmission/reception signal amplifying devices,wherein each of the outputs of said power detectors is compared with a control signal of said tilt angle control circuit to adjust the phase shifting amount of said variable phase shifting circuits on the basis of the contents of said phase shifting amount table. - View Dependent Claims (2, 3, 4)
- a plurality of transmission/reception signal amplifying devices each having a power amplifier, a variable phase shift circuit connected to an input portion of said power amplifier, a power detector connected to an output portion of said power amplifier, and a phase shifting amount table which is constructed on the basis of the characteristics of said power amplifier;
-
5. A system for transmitting/receiving an electrical signal, wherein a plurality of units each having an antenna and a transmission/reception signal amplifying device connected to said antenna are provided, and each of said plurality of units has a variable phase shift circuit connected to an input terminal for transmission of a transmission electric power amplifier, said circuit serving to take charge of the transmission electric power which is obtained by dividing the total electric power which is to be radiated from all of said antennas into the air.
-
6. A system for transmitting/receiving a signal having a carrier frequency band for a radio base station, said system comprising:
-
a plurality of automatic phase shift control feed forward transmission/reception units installed in parallel with one another, each unit comprising;
a first amplifier, a first variable phase shifter and variable attenuator, a first splitter, a first delay line, a first combiner;
a second amplifier, a second splitter, a second variable phase shifter and variable attenuator, a second splitter, a second delay line, a second combiner;
a third amplifier, a third splitter, a third variable phase shifter and variable attenuator, a third delay line, a third combiner;
a fourth splitter, a fourth variable phase shifter and variable attenuator, a fourth delay line, a fourth combiner;
a fifth splitter, an attenuator, a fifth delay line, a sixth splitter, a fifth combiner, a signal detector, a table reference circuit, a comparison circuit, a variable phase shifter, a signal control circuit, a transmission filter, a reception filter, a branch circuit, a fourth amplifier, and a first antenna, wherein an input signal terminal of said variable phase shifter is coupled to a transmission signal input terminal;
subsequently, said sixth splitter is coupled thereto;
an input terminal of said third splitter is coupled to a first output terminal of said sixth splitter;
an input terminal of said first splitter is coupled to a first output terminal of said third splitter through said third variable phase shifter and variable attenuator;
an input terminal of said first amplifier is coupled to a first output terminal of said first splitter through said first variable phase shifter and variable attenuator;
an input terminal of said second splitter is coupled to an output terminal of said first amplifier;
a first input terminal of said second combiner is coupled to a first output terminal of said second splitter through said second delay line;
an output terminal of said second combiner is coupled to a first input terminal of said fourth splitter;
an output terminal of said fourth splitter is coupled to a first input terminal of said fourth combiner through said fourth delay line;
an output terminal of said fourth combiner is coupled to an input terminal of said fifth splitter;
a first output terminal of said fifth splitter is coupled to one branch of said branch circuit through said transmission filter;
said first antenna is coupled to a common branch of said branch circuit;
an input terminal of said fourth amplifier is coupled to the other branch of said branch circuit through said reception filter;
a reception signal output terminal is coupled to an output terminal of said fourth amplifier;
said fifth delay line is coupled to a second output terminal of said fifth splitter through said attenuator;
subsequently, a first input terminal of said fifth combiner is coupled thereto;
a second output terminal of said sixth splitter is coupled to a second input terminal of said fifth combiner;
an output terminal of said fifth combiner is coupled to an input terminal of said table reference circuit through said signal detection circuit;
an output terminal of said table reference circuit is coupled to a first input terminal of said comparison circuit;
a second input terminal of said comparison circuit is a control signal input terminal of a tilt angle control circuit;
an output terminal of said third amplifier is coupled to a second input terminal of said fourth combiner;
an output terminal of said third combiner is coupled to an input terminal of said third amplifier through said fourth variable phase shifter and variable attenuator;
a second output terminal of said fourth splitter is coupled to a second input terminal of said third combiner;
a second output terminal of said third splitter is coupled to a first input terminal of said third combiner through said third delay line;
an output terminal of said second amplifier is coupled to a second input terminal of said second combiner;
an output terminal of said first combiner is coupled to an input terminal of said second amplifier through said second variable phase shifter and variable attenuator;
a second output terminal of said second splitter is coupled to a second input terminal of said first combiner; and
a second output terminal of said first splitter is coupled to a first input terminal of said first combiner through said first delay line, anda control circuit for referring to an output signal of said second combiner, an output signal of said fourth combiner, an output signal of said first combiner, and an output signal of said third combiner to control the phase/attenuation amount of said second variable phase shifter and variable attenuator, said fourth variable phase shifter and variable attenuator, said first variable phase shifter and variable attenuator and said third variable phase shifter and variable attenuator, and said one tilt angle control circuit for supplying a control signal to each of the control signal input terminals of said tilt angle control circuit of said plurality of automatic phase shift control feed forward transmission/reception units.
-
-
7. A system for transmitting/receiving a signal having a carrier frequency band for a radio base station, said system comprising:
-
a plurality of automatic phase shift control transmission/reception signal amplifying units installed in parallel with one another, each unit comprising a linear power amplifier, a fifth splitter, an attenuator, a fifth delay line, a sixth splitter, a fifth combiner, a signal detector, a table reference circuit, a comparison circuit, a variable phase shifter, a signal control circuit, a transmission filter, a reception filter, a branch circuit, a fourth amplifier and a first antenna, wherein an input signal terminal of said variable phase shifter is coupled to a transmission signal input terminal;
subsequently, said sixth splitter is coupled thereto;
an input terminal of said linear power amplifier is coupled to a first output terminal of said sixth splitter;
an output terminal of said linear power amplifier is coupled to an input terminal of said fifth splitter;
a first output terminal of said fifth splitter is coupled to one branch of said branch circuit through said transmission filter;
said first antenna is coupled to a common branch of said branch circuit;
an input terminal of said fourth amplifier is coupled to the other branch of said branch circuit;
a reception signal output terminal is coupled to an output terminal of said fourth amplifier;
said fifth delay line is coupled to a second output terminal of said fifth splitter through said attenuator;
subsequently, a first input terminal of said fifth combiner is coupled thereto;
a second input terminal of said fifth signal combiner is coupled to a second output terminal of said sixth splitter;
an output terminal of said fifth combiner is coupled to an input terminal of said table reference circuit through said signal detection circuit;
an output terminal of said table reference circuit is coupled to a first input terminal of said comparison circuit; and
a second input terminal of said comparison circuit is a control signal input terminal of one tile angle control circuit, andsaid one tilt angle control circuit for supplying a control signal to each of the control signal input terminals of said tilt angle control circuit of said plurality of automatic phase shift transmission/reception signal amplifying units. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
-
-
26. A system for transmitting an electrical signal, comprising:
-
a plurality of transmission signal amplifiers each having a power amplifier, a variable phase shift circuit connected to an input portion of said power amplifier, a power detector connected to an output portion of said power amplifier, and a phase amount table which is constructed on the basis of the characteristics of said power amplifier;
a plurality of antennas which are respectively connected to said plurality of transmission signal amplifiers;
tilt angle control circuit having a plurality of control lines which are respectively connected to said plurality of transmission signal amplifiers; and
a comparison control circuit for comparing an output of said power detector with a control signal of said tilt angle control circuit to generate a phase shift amount control signal on the basis of the contents of said phase shift amount table to supply the phase shift amount control signal to said variable phase shift circuit, thereby controlling an input transmission signal phase shift amount. - View Dependent Claims (27)
-
-
28. A system for transmitting/receiving a signal having a carrier frequency band for a radio base station, said system comprising a plurality of transmission/reception signal amplifying devices which are individually connected to a plurality of antennas constituting an array antenna and a tilt angle control circuit having a plurality of control lines, each of said transmission/reception signal amplifying devices comprising:
-
a power amplifier;
a variable phase shift circuit connected to an input portion of said power amplifier;
a power detector connected to an output portion of said power amplifier; and
a phase shift amount control circuit for comparing an output of said power detector with a tilt angle control signal of said tilt angle control circuit to control the phase shift amount of said variable phase shift circuit on the basis of the comparison result and the contents of a phase shift amount table which is produced in relation to the characteristics of said power amplifier.
-
-
29. A system for transmitting/receiving a signal having a carrier frequency band for a radio base station, said system comprising a plurality of transmission/reception signal amplifying devices which are individually connected to a plurality of antennas constituting an array antenna and a plurality of tilt angle control circuits, each of said transmission/reception signal amplifying devices comprising:
-
a transmission power amplifier; and
a variable phase shift circuit connected to an input portion of said transmission power amplifier for phase-shifting an input transmission signal in correspondence to the characteristics of said transmission power amplifier, wherein each of said transmission/reception signal amplifying devices is constructed in such a way as to take partial charge of the overall electric power which is to be radiated from said antennas into the air. - View Dependent Claims (30)
a power detector connected to an output portion of said transmission power amplifier; and
a phase shift amount control circuit for comparing an output of said power detector with a tilt angle control signal of said tilt angle control circuit to control the phase shift amount of said variable phase shift circuit on the basis of the comparison result and the contents of a phase shift amount table which is produced in relation to the characteristics of said power amplifier.
-
Specification