JPH0318105A - Antenna system - Google Patents

Abstract

PURPOSE:To reduce the number of cuts in a side lobe by adding a beam scan phase to plural kinds of fixed phases, transferring their phase data to a phase shifter on a time-division basis, and varying a radiation pattern on a time- division basis into a time-averaged radiation pattern. CONSTITUTION:A memory 5 is stored with several kinds of fixed phase terms Pr for varying data Pn. Then an adder 4 adds the data Pr stored on the memory 5 to the data Pn transferred to a phase shifter control part 2 through a control signal line 3a while varying the data on the time-division basis. The control part 2 controls the phase shifter 1 according to the phase quantity obtained by the addition to vary the radiation pattern on the time-division basis and sends time-divided radiation patterns, one over another, to a microwave transmission line 3b. Consequently, the radiation pattern having a small number of cuts in the side lobe is easily obtained as the time-averaged radiation pattern.

Description

[Detailed Description of the Invention] [Toshida Field of Business] This invention relates to the formation of a radiation pattern in an electronic scanning antenna that electronically scans a beam. [Prior Art] A conventional electronic scanning antenna will be explained. Fig. 7 shows a conventional electronic scanning antenna, in which 1 to J1 are element antennas, bl to bn are modules consisting of a phase shifter and a phase shifter control section, etc., and C is a power distribution combiner circuit. , d is a dubrexa. FIG. 8 shows the inside of the modules b1 to bn, which are an e-transmitter, an f-receiver, and a g-beam controller. (2) Key phase device control section,
(3q) is the beam controller g and the ftil@signal line, and (3b) is the microwave transmission brown path. When transmitting, this captive scanning antenna uses a four-power distribution/synthesis circuit to divide the signal from the transmitter e. Distributed from cK. module b
4 phase domain in 1 to bn] 1) to suppress the phase and supply element antennas 91 to ernK. and. The element antennas 111 to 9n radiate into space and form a beam, and when receiving, the element antennas! 11~! The phase of the signal incident on In is controlled by the phase shifter in module b1bn. Combine signals from power distribution/synthesis circuit cK and receive%
f[Enter'! In addition, this antenna uses the phase data calculated by the beam controller g to be controlled by the module's phase shifter m (
Is it possible to scan the beam in four beams by transferring it to 21? In ltll H device g, perform the following calculation for each element, Pn "" PBn + PFn + Pcn where,
Pn P Phase shift information given to the phase shifter of each module + P
13n is the amount of phase shift required for beam scanning, PFn is the amount of phase shift for beam shaping * Pen is the amount of phase shift to correct paranoia of each element, How to find the amount of phase shift PBn essential for beam scanning To explain, FIG. 9 shows a conceptual diagram showing beam scanning.

In the figure, X, 7, and Z are coordinate axes,
The x-ym plane is the antenna Taguchi plane, θ and φ indicate the beam scanning angle, and xn + 7n are the coordinates of the element.
The beam scanning phase shift scene given to the element is where λ is the wavelength, and the phase shift for the PFn beam 52 type is the phase shift given to the beam shape other than the pencil beam. Yes, this is normally held as memory data.PCn is a phase shift cable that captures the antenna D paranoia.

This is due to manufacturing errors, FgJq teaching characteristics, and temperature characteristics. This is due to the difference between the transmitting system and receiving system, the difference in pulse duty, etc., and the data is measured and held according to each field when adjusting the antenna. When there are many elements and there are many bite factors, the amount of light becomes enormous.These effects are performed by the beam controller g, and the phase shifter {1} of the moss module is set. A radiation pattern is formed. Figure 10 shows the pencil beam radiation pattern that is commonly used. tlf+ is - degrees. Vertical/Ill armpit level, {A} is the pencil beam radiation pattern, (mouth) is the level for the null filling role.The pencil beam radiation pattern is K as shown in the figure, and has side ropes. In between, there is a notch (null point) and a sharp radiation pattern, which causes an angle that is below the null filling setting level (b)! Ta. Figure @11 shows the pattern of changes in beam scanning, etc.

In the figure, B1 to Bm are patterns that change the beam scanning, and B1 to Bm each represent the beam scanning angle, frequency, and beam shape. The beam changes corresponding to changes in pulse duty etc. are shown. In response to this change, PBn. PFne pan changes.

(Problem to be Solved by the Invention) Since the antenna device of Juto is configured as described above, an angle that is below the level of Null Filling 1 shown in B in Figure 1 occurs.Fixed wave number and beam scanning angle There is a problem in that it is difficult to obtain a radiation pattern that satisfies the Null Filling function level B even if the value is changed.

This invention was made to eliminate the problems mentioned above. without increasing hardware. [Means for solving the problem] An antenna device according to the present invention aims to obtain an antenna device that can easily obtain a radiation pattern that satisfies the Null Filling service level. By making sensible changes. The antenna device according to the present invention satisfies the Null Filling setting level as a time average. [Operation] The antenna device of this invention changes the four-phase amount for beam shaping in a time-division manner. As a time average pattern, the set level can be satisfied.

[Implementation row]

The Ichijime row of this invention will be described below. FIG. 1 shows the pattern of changes in the beam scanning etc. of this invention. B21 B22
...B2U...Bm1Bm2...BmlV Indicates changes in beam scanning, etc. B11B12゜”
B1j'. B21 B22 ”' B2l....
．． Bml Bm2 ・= BmlPa conventional}lj
, B2 ・−Bm, therefore. This is a finer change than in conventional beam scanning, etc. At this time, the phase of each element calculated by the beam controller is F/n = Pn + Pr, where Pr is the phase term that gives the conventional data JPnrf conversion. , Pn calculated in a certain mode is Pr K
The change in 1 to 1 times is given by determining the change due to η. The sequence obtained in this way, which is the average 00 random phase of Pr at this time, is shown in Figure 2 VC.
Figure K is an overlay of the changes in the three cases.In this way, the main beam remains the same, but the sidelobe level changes. Figure 3 shows the three pattern peak levels. By superimposing the radiation patterns divided in K time in this way, one that satisfies the null filling setting level can be obtained. Figure 4 shows the inside of the module. In the figure, (4) is an adder, and (5) is a memory, where the Pr
Transfer the data. Put it in Memo II {5), and then transfer the transferred pnKPr to the time-sharing VC.
By setting the phase shifter while changing. By superimposing time-division attack patterns, a level that satisfies the Null Filling setting level can be obtained, and the principle is the same as described above.

The four parts of another embodiment of the beam controller g are shown in FIG. In the figure. (6) is the control section. C7) Theater section. (8) is the random phase generator, and the beam control unit generates P
The random phase generated in the nK random phase generator is ηo
By changing the VC and random phase, it is possible to change the radiation pattern in a time-division manner and satisfy the null filling setting level by overlapping the radiation patterns in a time-division manner. FIG. 6 shows the inside of another example module.

In the figure, (9) is the random phase generator. In the previous example, the fixed phase was stored in memory. In this example #4, the random phase generated in the random phase generator is converted into the phase V transferred from the beam controller.
In this method, the radiation pattern is changed in a time-division manner, and the radiation pattern is superimposed to satisfy the required level of the null filling function.

In addition, in the above implementation ``1'', we talked about a passive beam scanning antenna, but an active beam scanning antenna with an amplifier etc. may also be used, and any structure such as the module structure may be used. Configuration of the phase power port circuit. The method of generating the random phase can be any method. [Effect of the Invention] As described above, according to this invention K, the radiation phase can be divided into time By changing it in the play, the time average release 'lt=t
As a pattern, there are few cuts in the side lobes! It has the effect of easily obtaining a reflection pattern,

[Brief explanation of drawings]

;@1 11 is a diagram showing a changing pattern of beam scanning, etc. in one embodiment of this invention, and Figure 2 is an overwritten diagram of the radiation pattern when beam scanning, etc. changes. Figure 3 is a pattern diagram drawn by collecting peak values, 4th 1'! 2l is a diagram showing the inside of the module in the pond row. Figure 5 is a diagram showing the internal configuration of the beam controller used in the song. Figure 6 is a diagram showing the inside of the module of another implementation row. Figure γ is a diagram of the configuration of a conventional scanning antenna. Figure 8 shows the module structure Fv. figure. Week 91 is a conceptual diagram showing beam scanning.
FIG. 10 is a diagram showing the radiation pattern, and FIG. 11 is a diagram showing the variation pattern of conventional beam scanning. (l) is the great phase device, {2) is the phase shifter 2 (control unit), (3I!) is the suppression signal Isoji, (3b) is the microwave transmission path, (4J power σW keyaki, t5) is the memory (6) is the control section. (7) is the operator m, +8) is the memory l - +9) is the random phase generator, 91 to lI.
n is an element antenna, b1 to bn are modules, C is a power distribution/combination circuit, d is a duplexer, e is a transmitter,
f is a receiver, and g is a beam controller. (a) shows the radiation pattern of the pencil beam, (b) the set level of the round filling, and (c) shows the radiation pattern when the runtime phase is changed. Alternatively, corresponding parts are indicated with the same reference numerals.

Claims (4)

[Claims] (1) A plurality of element antennas, a module that corresponds to each of these element antennas and is composed of a phase shifter, a phase shifter control unit, etc., a transceiver, and an intervening device between the above module and the transceiver. In the antenna device, the beam controller adds the beam scanning phase and several types of fixed phases, and the phase data is obtained by adding the beam scanning phase and several types of fixed phases. An antenna device characterized in that the radiation pattern is transferred to a phase shifter in a time-division manner and the radiation pattern is changed in a time-division manner, thereby forming a radiation pattern with fewer cuts in the side ropes as a time-average radiation pattern. . (2) A plurality of element antennas, a module that corresponds to each of these element antennas and is composed of a phase shifter, a phase shifter control unit, etc., a transceiver, and an intervening device between the above module and the transceiver. In the antenna device, the beam scanning phase is calculated by the beam controller and transferred to the module to control the phase shifter. By adding several types of fixed phases in the section and changing the phase data in a time-division manner, a radiation pattern with fewer cuts in the side ropes is formed as a time-averaged radiation pattern. Characteristic antenna device. (3) A plurality of element antennas, a module corresponding to each of these element antennas and composed of a phase shifter, a phase shifter control unit, etc., a transceiver, and a transceiver interposed between the above module and the transceiver. In an antenna device including a power distribution/synthesis circuit and a beam controller connected to the phase shifter control section, a random phase change generated by the beam controller is added to the beam scanning phase to determine the phase. By transferring data to the phase shifter in a time-division manner and changing the radiation pattern in a time-division manner, a radiation pattern with fewer cuts in the side ropes is formed as a time-averaged radiation pattern. antenna device. (4) A plurality of element antennas, a module that corresponds to each of these element antennas and is composed of a phase shifter, a phase shifter control unit, etc., and a transceiver, interposed between the above-mentioned module and the transceiver. In an antenna device including a power distribution/synthesizing circuit and a beam controller connected to the phase shifter control section, the beam scanning phase is calculated by the beam controller and transferred to the module, and the beam scanning phase is calculated by the beam controller and transferred to the module. By adding up the random phases generated by , and changing the phase data in a time-division manner, a radiation pattern with fewer side rope cuts is formed as a time-averaged radiation pattern. Characteristic antenna device.