Antenna apparatus
First Claim
1. An antenna apparatus, comprising:
- a first branch unit including a first antenna element, a first transmitter, and a first directional coupler for outputting a received signal from said first antenna element to an output terminal during the reception, outputting a transmitting signal from said first transmitter to said first antenna element during a transmission, and providing feedback of the transmitting signal from said first transmitter to said output terminal with a predetermined attenuation rate;
a second branch unit including a second antenna element, a second transmitter, and a second directional Coupler for outputting a received signal from said second antenna element to an output terminal during a reception, outputting a transmitting signal from said second transmitter to said second antenna element during the transmission, and providing feedback of a transmitting signal from said second transmitter to said output terminal with a predetermined attenuation rate;
a third directional coupler for outputting an inputted signal of a first input terminal to a first output terminal during the reception, Coupling said inputted signal to a second output terminal with a predetermined attenuation rate, outputting an inputted signal of a second input terminal to a second output terminal, and coupling said inputted signal to a first output terminal with a predetermined attenuation rate, wherein said first and said second input terminals are connected to directional couplers at said first branch unit and said second branch unit, respectively, and said first and said Second output terminals are connected to said first and said second receivers, respectively; and
operating means for obtaining a calibration factor for calibrating said second branch unit in accordance with a first received signal for calibrating, which is coupled to said second receiver by said first and third directional couplers when said first transmitter transmits the signal and a second received signal for calibrating, which is coupled to said first receiver by said second and third directional couplers when said second transmitter transmits the signal.
1 Assignment
0 Petitions
Accused Products
Abstract
To realize an antenna apparatus capable of measuring a calibration factor accurately and further, capable of estimating an arrival direction of a received signal by composing a calibration circuit by using a directional coupler. The antenna system includes L-number of branch units, a calibration circuit and an operating unit. Each directional coupler composing the calibration circuit is structured symmetrically. Measuring the received signals Yti, i−1 and Yti, i+1 of i−1th and i+1th receivers, respectively, when an ith transmitter transmits a signal, on the basis of the first branch unit, the operating unit calculates a calibration factor at the ith branch unit as Hi=T1Ri/(TiR1)=Yt12Yt23−Yti−1,i/Yt21Yt32−Yti,i−1.
22 Citations
6 Claims
-
1. An antenna apparatus, comprising:
-
a first branch unit including a first antenna element, a first transmitter, and a first directional coupler for outputting a received signal from said first antenna element to an output terminal during the reception, outputting a transmitting signal from said first transmitter to said first antenna element during a transmission, and providing feedback of the transmitting signal from said first transmitter to said output terminal with a predetermined attenuation rate;
a second branch unit including a second antenna element, a second transmitter, and a second directional Coupler for outputting a received signal from said second antenna element to an output terminal during a reception, outputting a transmitting signal from said second transmitter to said second antenna element during the transmission, and providing feedback of a transmitting signal from said second transmitter to said output terminal with a predetermined attenuation rate;
a third directional coupler for outputting an inputted signal of a first input terminal to a first output terminal during the reception, Coupling said inputted signal to a second output terminal with a predetermined attenuation rate, outputting an inputted signal of a second input terminal to a second output terminal, and coupling said inputted signal to a first output terminal with a predetermined attenuation rate, wherein said first and said second input terminals are connected to directional couplers at said first branch unit and said second branch unit, respectively, and said first and said Second output terminals are connected to said first and said second receivers, respectively; and
operating means for obtaining a calibration factor for calibrating said second branch unit in accordance with a first received signal for calibrating, which is coupled to said second receiver by said first and third directional couplers when said first transmitter transmits the signal and a second received signal for calibrating, which is coupled to said first receiver by said second and third directional couplers when said second transmitter transmits the signal. - View Dependent Claims (2, 3)
-
-
4. An antenna apparatus, comprising:
-
L-number branch units (wherein L=2 and L is an integer) having antenna elements, directional couplers and transmitters, wherein said directional couplers output the received signal from said antenna element to an output terminal during the reception, output the transmitting signal from said transmitter to said antenna element during a transmission, and provide feedback of the transmitting signal from said transmitter to said output terminal with a predetermined attenuation rate;
a plurality of directional couplers at a second layer, each of which is provided for each pair of said L-number branch units, wherein a first input terminal is connected to said directional coupler at an ith branch unit (wherein l=i =L and i is an odd number), a second input terminal is connected to said directional coupler at an (i+l)th branch unit, an inputted signal from said first input terminal is sent to a first output terminal, an inputted signal from said second input terminal is coupled to a first output terminal with a predetermined attenuation rate, and said inputted signal from said second input terminal is sent to said second output terminal, and said inputted signal from said first input terminal is coupled to said second output terminal with a predetermined attenuation rate;
a plurality of directional couplers at a third layer, each of which is provided for a respective directional coupler at the second layer, wherein first and second input terminals are connected to a first output terminal or a second output terminal of the adjoining directional coupler at said second layer, and said first and second output terminals are connected to a receiver; and
operating means for obtaining a calibration factor for said each branch unit in accordance with received signals of (i−
l)th and (i+l)th receivers when a transmitter at said ith branch unit transmits a signal.- View Dependent Claims (5, 6)
-
Specification