JPH0574037U - Passive directional control array antenna - Google Patents

Abstract

(57) [Abstract] [Purpose] To simplify the circuit of a directivity control array antenna in a radio base station. [Configuration] The terminal 8 transmits position information indicating the location of the terminal itself to the base station, and the control unit 6 of the base station shifts the phase by a predetermined amount of phase shift corresponding to the received position information. The devices 3 and 4 are operated to control the directivity of the antennas 1 and 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a passive type directional control array antenna that has a directivity in a radio wave transmission direction within a certain range.

[0002]

[Prior Art]

 As shown in the block diagram of FIG. 3, the conventional directional control array antenna receives the radio waves emitted from the terminal 8 by the array antennas 1 and 2 of the base station, and the phase shifters connected to each of them. It passes through 3 and 4 and is input to the arithmetic unit 5. The signal combined by the arithmetic unit 5 becomes an antenna output, and this antenna output is also input to the control unit 6 at the same time. The control unit 6 controls each of the phase shifters 3 and 4 so that the combined signal becomes maximum. Change the amount of phase shift. When the phase shift amount that maximizes the combined signal is given, the antennas 1 and 2 have directivity in the direction of arrival of radio waves.

[0003]

[Problems to be solved by the device]

 However, the conventional directional control array antenna receives incoming radio waves from unknown directions, so the amount of phase shift of the phase shifter must be constantly changed so that the combined signal of the received waves is maximized. It was In other words, the direction of the antenna's directivity must always be scanned to detect and track the direction of arrival of the radio wave, and the control logic for that is complicated. In addition, if a strong interfering wave with the same frequency as the operating carrier arrives from another direction, there is a risk that the directivity of the antenna may go in the direction of the interfering wave.

[0004]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, in the present invention, the terminal transmits position information indicating the location of the terminal itself to the base station, and the base station preliminarily determines corresponding to the received position information. The phase shifter is configured to operate by the amount of phase shift.

[0005]

According to the present invention, the terminal transmits position information to the base station, and the base station changes the antenna directivity of the base station by a predetermined amount of phase shift based on the position information. Therefore, it is possible to receive data without the need for complicated control logic for detecting and tracking the direction of arrival of a radio wave and without being affected by an interfering wave.

[0006]

【Example】

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an embodiment showing a passive directional control array antenna of the present invention. In this figure, the invariant dimming 9a emitted from the light source 9 provided in the terminal 8 is one of a plurality of directional optical sensors 10 arranged in the base station 7, for example, the sensor a. The light is received and converted into an electric signal to become a position information signal indicating the direction of "A". This position information signal is input to the control unit 6, and the phase shift amounts of the phase shifters 3 and 4 corresponding to the direction “A”, for example, φ _A1 and φ _A2 are selected in the control unit 6, and this phase shift signal is selected. It is converted into a control signal S _A for operating the quantity and is input to the phase shifters 3 and 4. As a result, the antennas 1 and 2 immediately have the directivity of the optical signal arrival direction "A".

After that, the radio waves received by the antennas 1 and 2 are combined by the calculator 5 to be the antenna output. This is the same when there are three or more antennas. The same applies when an electromagnetic wave having a sharp directivity is used as a position information signal instead of light. FIG. 2 is a block diagram showing a passive directional control array antenna according to another embodiment of the present invention. The terminal 8 in the direction "A" when viewed from the base station 7 modulates the light of the light source 9 provided in the terminal 8 as a position information signal a 1 representing the direction "A", and this modulation is performed. Light is emitted toward the base station. The modulated light is received by the optical sensor 10 arranged in the base station 7, converted into an electric signal, and demodulated by the demodulator 11 into a position information signal a. Assuming that the phase shift amounts of the phase shifters 3 and 4 corresponding to the position information signal a are φ _A1 and φ _A2 , respectively, the position information signal a in the control unit 6 activates this phase shift amount. Is converted into the control signal S _A and input to the phase shifters 3 and 4.

As a result, the antennas 1 and 2 immediately have a directivity in the direction of “A”, and the radio waves received by the antennas 1 and 2 are combined by the calculator 5 and become the antenna output.

[0009]

[Effect of the device]

 As described above, the present invention has an effect that the control logic for detecting the direction of arrival of radio waves at the base station can be omitted by transmitting the position information signal from the terminal to the base station, and the circuit can be simplified. Further, even if a strong interfering wave with the same frequency as the operating carrier wave comes from another direction, the antenna directivity does not change by detecting the interfering wave.

[Brief description of drawings]

FIG. 1 is a block diagram of a passive directional control array antenna of the present invention.

FIG. 2 is a block diagram of a passive directional control array antenna according to another embodiment of the present invention.

FIG. 3 is a block diagram of a conventional directional control array antenna.

[Explanation of symbols]

 1, 2 Antennas 3, 4 Phase shifter 5 Computing unit 6 Control unit 7 Base station 8 Terminal device 9 Light source 10 Optical sensor 11 Demodulator

Claims (1)

[Scope of utility model registration request] 1. In a radio base station of a mobile communication system, at least two or more antennas are arranged at intervals of half a wavelength of a carrier wave to be operated, and a fixed signal is provided for a received signal provided for each antenna. A phase shifter that gives a phase shift amount,
An arithmetic unit that synthesizes and outputs signals from the phase shifters,
It is composed of a sensor that receives a position information signal emitted from a terminal and a control unit that outputs a signal for varying the amount of phase shift given to the phase shifter in response to the position information signal of the sensor. A passive type directional control array antenna characterized by the following.