JPH09148835A - Tilt angle controller for array antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a controller which is capable f easily, quickly, continuously and minutely changing the tile angle of an array antenna and approximately matching the set value with the realized value of the tilt angle over wide frequency bands. SOLUTION: Between each of output terminals 31 to 33 of plural rotary type phase shifters 41 to 43 to which the excited power of an antenna is added via a distributor 2 and power feeding lines 81 to 86 which are equal in length with each other, transmission lines 61 to 66 for adjustment of phase shift amount are connected. The rotary type phase shifters 41 to 43 are provide with second exciter with which two orthogonal components of the linear polarized waves generated from a a first exciter excited by input power is coupled, the first and second exciters are relatively rotatable around the axis connecting each center, the phase shift amount is fixed according to this rotational angle and a circuit synthesizing the two-outputs generated by the two orthogonal components of the linear polarized wave coupled with the second exciter is provided. In the frequency which is the middle of a use frequency band, the length of the transmission line 61 is formed shorter by 360 deg. in a phase angle and the length of the transmission line 66 is formed longer by 360 deg. in phase angle than each length of the transmission line 62 and 65 (non-illustrated).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus suitable for controlling a tilt angle of an array antenna for a base station in a land mobile communication system.

[0002]

2. Description of the Related Art In a land mobile communication system represented by a mobile phone, a new base station is installed by interruption in an existing base station network in order to cope with a rapid increase in the number of users in recent years. The total number of base stations is increased, the service area of each base station is reduced, the number of times the frequency is repeatedly used is increased, and frequency resources are effectively used. That is, it is attempting to cope with a rapid increase in the number of users within the conventional allocated frequency band without increasing the number of allocated frequency bands. Then, in order to reduce the service area of each base station, the tilt angle of the radiation beam from the array antenna in each base station is controlled to be deep, but at that time, a dead zone of the radio wave may occur. Therefore, it is necessary to adjust the tilt angle between the adjacent base stations.

FIG. 17 is a diagram showing a tilt angle control device constructed by using a transmission line for adjusting the amount of phase shift in order to achieve the above object. 1 is an input terminal of excitation power and 2 is power distribution. Units 3 ₁ to 3 ₆ are distributed output terminals, 6 ₁ to 6
₆ is a transmission line for adjusting the amount of phase shift, 7 ₁ to 7 ₆ are output terminals for phase shift power, 8 ₁ to 8 ₆ are feeder lines, and 9 ₁ to 9
₂₄ is an element antenna and 10 ₁ to 10 ₆ are antenna blocks. Excitation power applied to the terminal 1 is 6 distributed power divider 2, terminals 3 ₁ to 3 ₆ to the transmission line 6 ₁ for the phase shift adjusted via the 6 _6, to the terminal 7 ₁ 7 ₆
And feed lines 8 ₁ to 8 ₆ to the antenna blocks 10 ₁ to 10 ₆ . The length of the transmission line 6 ₁ to 6 ₆ for adjusting the phase shift amount is the shortest in the line 6 ₁ .
Each element of the antenna block 10 ₁ can be formed by forming the feeding lines 8 ₁ to 8 ₆ so as to be equal in length while being formed so as to become longer sequentially from the lines 6 ₂ to 6 _6. The phase of the excitation power applied to the antennas 9 ₁ to 9 ₄ is most advanced, and the antenna block 10 ₂
Since the phases of the excitation powers applied from the element antennas 9 ₅ to 9 ₈ of the antenna block 10 _{6 to} the element antennas 9 ₂₁ to 9 ₂₄ of the antenna block 10 ₆ are sequentially delayed, the element antennas 9 ₁ to 9 ₁ of the antenna block 10 _{1 With} respect to the phase of the composite radiated wave from ₄ , the composite radiated waves from the element antennas 9 ₅ to 9 _{8 of} the antenna block 10 ₂ reach the composite radiated waves of the element antennas 9 ₂₁ to 9 ₂₄ of the antenna block 10 _6. Thus, the respective phases are sequentially delayed, and the combined directivity of the antenna blocks 10 ₁ to 10 ₆ is tilted downward with respect to the horizontal plane.

[0004]

In the conventional tilt angle control device shown in FIG. 17, the phase shift amount adjusting transmission line 6 is used.
It is necessary to change each length according to each required amount of phase shift in ₁ to 6 _6, and for this purpose, it is necessary to replace with a line having a length corresponding to the required amount of phase shift. It takes a relatively large amount of labor and time to change the quantity, and it is impossible to continuously and minutely change the length of the line.
It is also difficult to finely adjust the amount of phase shift continuously.

[0005]

SUMMARY OF THE INVENTION The present invention comprises a power distributor connected to an input terminal for exciting power, a plurality of rotary phase shifters connected to a distribution output terminal of the power distributor, and a plurality of rotary phase shifters. And a transmission line for adjusting the amount of phase shift, which is inserted and connected between the output terminal of the rotary type phase shifter and the feed line to the antenna, and the input of which the rotary type phase shifter is added via the input terminal. A first exciter that is excited by the above-mentioned to generate a linearly polarized wave, a second exciter in which two orthogonal components of the linearly polarized wave generated by the first exciter are coupled, and a first and a second exciter , A shield case which is relatively rotatably mounted around an axis connecting the centers of both exciters, and two outputs generated by two orthogonal components of linearly polarized waves coupled to the second exciter. By providing a tilt angle control device for the array antenna, which comprises It is intended to Nozoko the shortcomings of the device.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing an embodiment of the present invention, in which 1 is an input terminal of excitation power (or output of received power), 2 is a power distributor (or power combiner), and 3 ₁ Through 3
₃ distribution output (or synthetic input) terminal, 4 ₁ to 4 ₃
Is a rotary phase shifter previously proposed by the present inventors, 5 ₁ to 5 ₆ are terminals for output of phase shift power for transmission (or input of phase shift power for reception), and 6 ₁ to 6 ₆ are phase shift amounts. A transmission line for adjustment, 7 ₁ to 7 ₆ are output (or input of received power) terminals for phase shift power for transmission, 8 ₁ to 8 ₆ are power supply lines, and 9 ₁
To 9 ₂₄ element antenna, 10 ₁ to 10 ₆ is an antenna block.

2 to 12 show rotary type phase shifters 4 ₁ to 4 ₃ in FIG. 1, that is, rotary type phase shifters (Japanese Patent Application No. 6-175974) proposed by the present inventors. It is a figure for demonstrating a structure and operation. Since the rotary type phase shifters 4 ₁ to 4 ₃ all have exactly the same configuration, the configuration and operation of the rotary type phase shifter 4 ₁ will be described below. FIG. 2 shows the rotary phase shifter 4 shown in FIG.
₁ is a side view showing ₁ , where 11 is a coupler, 11 ₁ and 11 ₂
Is a cylindrical case having a bottom, and 11 ₃₁ to 11 ₃₃ are terminals, which are, for example, coaxial connectors. 12 consists of for example _{^{1/4-wavelength}} coupling line type directional coupler 90 ° 3 dB hybrid circuit, 12 ₁ denotes an input terminal (or isolator - Deployment terminal) 12 ₂ isolator - Deployment terminal (or the input terminal), 12 ₃ And 12 ₄ are output terminals, and output terminal 1
The phase of the output of 2 ₃ (or 12 ₄ ) depends on the output terminal 12 ₄
(Or 12 ₃ ) is delayed by 90 ° with respect to the output phase. Coaxial lines 13 ₁ and 13 ₂ are coaxial lines so that the phase differences between the inputs to the input ends of the coaxial lines 13 ₁ and 13 ₂ are maintained as they are and output to the output ends of the coaxial lines 13 ₁ and 13 _2. The lengths of the lines 13 ₁ and 13 ₂ are adjusted.

[0008] Figure 3 is a coaxial line from coaxial connector 11 ₃₂ and 11 ₃₃ of the coupler 11 in FIG. 2 13 ₁ and 13 ₂
FIG. 4 is a view of the side surface of the coupler 11 in a state in which the connector is removed (a side view viewed from the same direction as FIG. 2), and FIG.
FIG. 3 is a view of the bottom wall surface on the side of the rear case 11 ₁ and the reference numerals in FIGS. 3 and 4 are the same as those in FIG.

FIG. 5 is an enlarged sectional view of a portion AA in FIG.
FIG. 6 is an enlarged cross-sectional view of the BB portion of FIG. 3, and FIG.
5 to FIG. 7, 11 ₁ and 11 ₂ are the bottomed cylindrical shield cases described in FIG. 2, and both shield cases 11 ₁ and 11 ₂ is provided with a step on the side wall surface of each opening end, and the opening end of the shield case 11 ₂ is fitted inside one of the shield cases, for example, 11 _1. Both shield cases are mechanically and electrically coupled and shield case
The screws 11 ₁ and 11 ₂ are formed so as to be rotatable relative to each other around a cylindrical axis. 11 ₄₁ to 11 ₄₃ are internal conductors of the coaxial plugs 11 ₃₁ to 11 ₃₃ , and 11 ₅₁ and 11 ₅₂ are made of an organic material such as polyethylene or fluorinated ethylene having excellent high frequency characteristics, or an inorganic material such as ceramics. The insulating disk 11 ₅₁ is an insulating disk having a thickness smaller than the wavelength. The insulating disk 11 ₅₁ is on the inner surface of the bottom wall of the shield case 11 ₁ and the insulating disk 11 ₅₂ is the bottom wall of the shield case 11 ₂ . On the inner surface of
They are stuck to each other. 11 ₆₁ is a metal plate, an insulating disk 1
Attached to the surface of 1 ₅₁ and coaxially plug part of the periphery 1
Insulating disc 1 electrically connected to the inner conductor 11 ₄₁ of 1 ₃₁
Shield casing 11 ₁ facing each other through 1 ₅₁ is a ground conductor, metal plate 11 ₆₁ is a first excitation element, and a connection point between inner conductor 11 ₄₁ of coaxial connector 11 ₃₁ and metal plate 11 ₆₁ is excitation. A first exciter consisting of a point microstrip antenna is formed. 11 ₆₂ is also a metal plate, and an insulating disk 11 ₅₂
It is fixed to the surface of the connector and a part of its periphery is coaxial connector 11 ₃₂
And 11 ₃₃ are electrically connected to the inner conductors 11 ₄₂ and 11 ₄₃ , respectively, and the shield case 11 ₂ facing each other via the insulating disc 11 ₅₂ is a ground conductor, and the metal plate 11 ₆₂ is a second excitation. A second exciter is formed of a microstrip antenna in which the connection points between the elements and the inner conductors 11 ₄₂ and 11 _{43 of} the coaxial connectors 11 ₃₂ and 11 ₃₃ and the metal plate 11 ₆₂ are excitation points. Incidentally, coaxial connector 11 ₃₂ and a line connecting the center point of the inner conductor 11 ₄₂ and the metal plate 11 ₆₂ excitation point and the metal plate 11 ₆₂ of the connecting point of the inner conductor 11 ₄₃ with the metal of the coaxial connector 11 ₃₃ the intersection angle between the line connecting the center point of the excitation point and the metal plate 11 ₆₂ of the connecting point of the plate 11 ₆₂ is formed so as to be perpendicular. In addition, the first excitation element 11 ₆₁ and the second excitation element 1 ₆₁
Opposing distance between 1 _62, are formed to have a small compared to the transmission wavelength. The outer conductor of the coaxial connector 11 ₃₁ is electrically connected to the shield case 11 ₁ and the outer conductors of the coaxial connector 11 ₃₂ and 11 ₃₃ are electrically connected to the shield case 11 ₂ , respectively. Each inner conductor 11 _{41 of the} plugs 11 ₃₁ to 11 ₃₃
No. 11 to No. 11 ₄₃ are not electrically connected to the shield cases 11 ₁ and 11 ₂ and, as shown in FIG. 7, shield case 11 around the inner conductor 11 _41.
Part ₁ is partially removed to create a gap, and the inner conductor 11 ₄₃
Sheet at around - Rudoke - is provided with a gap by removing a part of the portion of the scan 11 _2. Although it does not appear in Figure 7,
A space is also provided in the shield case 11 ₂ around the inner conductor 11 ₄₂ of the coaxial plug 11 ₃₂ .

FIG. 8 is a diagram for explaining the operation of the rotary type phase shifter described with reference to FIGS. 2 to 7. The input applied to the coaxial connector 11 ₃₁ of the coupler 11 is the inner conductor 11 ₄₁ . The exciter element ₆₁ 1 in the first exciter is excited via this.
When the X axis and the Y axis are taken as shown in FIGS. 5, 6 and 8A, the exciting element 11 ₆₁ excited as described above is obtained.
The electric field vector E generated by is divided into two orthogonal components E _X and E _Y as shown in FIG. 8 (a), and E = E _X + E _Y = E cos φ + E sin φ ... (1) 2 to the exciter element 1 ₆₂ of the exciter. Coaxial connector 11 ₃₂ and the line connecting the inner conductor 11 ₄₂ with excitation point consisting connection point of the excitation element 11 ₆₂ and the center point of the excitation element 11 _62, inner conductor 11 ₄₃ with the excitation element 11 of the coaxial connector 11 _{33 62}
Since as described above the angle of intersection of the excitation point and the line connecting the center point of the excitation element 11 ₆₂ of the connecting point are formed so as to be at right angles, the excitation element 11 ₆₂ Basic mode - in de When excited, the coupling between the coaxial plugs 11 ₃₂ and 11 ₃₃ becomes sparse and the orthogonal mode coupling becomes possible. Excitation element 1
Orthogonal mode to 1 ₆₂ - component E _X from coaxial connector 11 ₃₂ by coupling of the soil, component E _Y from coaxial connector 11 _33, are output, coax - via the table 13 ₁ and 13 ₂ 9
Terminals 12 ₁ and 1 of 0 ° 3 dB hybrid circuit 12
Input to 2 ₂ . 90 ° 3dB hybrid circuit 12
Let E _{1 be} the output of the terminal 12 ₄ and E ₂ be the output of the terminal 12 ₃ .

(Equation 1) And the output E ₁ is the electric field vector E shown in FIG.
As the declination φ from the X axis increases, the phase changes counterclockwise, but the amplitude does not change. The phase of the output E ₂ changes clockwise as the angle φ of the electric field vector E from the X axis increases, but the amplitude does not change. Therefore, when the deviation angle φ of the electric field vector E from the X axis is 45 ° or 225 °, the output E
₁ and E ₂ have the same amplitude and the same phase, but when the argument φ increases from 45 ° or 225 °, the phase of the output E ₁ changes in the advancing direction.
The phase of the output E ₂ changes in the lagging direction. The deviation angle φ of the electric field vector E from the X axis is further increased to 135 ° or 3
When it reaches 15 °, the phase relationship between the outputs E ₁ and E ₂ is opposite to each other.

FIG. 9 shows a shield case in the coupler 11.
The inner diameter of the bottomed cylindrical body forming the scan 11 ₁ and 11 ₂ to 0.285λ _O (λ _O is the free space wavelength corresponding to the designed frequency f _O), sheet - Rudoke - scan 11 ₁ of the bottom wall and sheet - Rudoke - the opposing distance between the scan 11 ₂ of the bottom wall to 0.089λ _O,
Each dielectric constant of the insulating disc 11 ₅₁ and 11 ₅₂ to 10, each dielectric loss tangent of the insulating disc 11 ₅₁ and 11 ₅₂ 0.0055
And the thickness of each of the insulating disks 11 ₅₁ and 11 ₅₂ is 0.023.
At λ _O , the first and second excitation elements 11 ₆₁ and 11 ₆₂
Each contour shape of is formed into a circle and each diameter is 0.21λ _O
And the coaxial connectors 11 ₃₂ and 1 respectively.
In diagram showing the reflection characteristics in the coaxial connector 11 ₃₁ Observed removed Bull 13 ₁ and 13 _2, - coax from 1 ₃₃
The horizontal axis represents the specific frequency with respect to the design frequency f _O , and the vertical axis represents the return loss (dB). In FIG. 10, the dimensions and the like of each part of the coupler 11 are selected in the same manner as the values described with reference to FIG. 9, and the coaxial connectors 11 ₃₂ and 11 ₃₃ to the coaxial cable 13 are selected.
_It is a figure which shows the transmission characteristic between the coaxial plugs 11 ₃₁ and 11 ₃₃ which removed and observed ₁ and 13 _{2. The} horizontal axis is the same as FIG. 9, and a vertical axis is the amount of transmission attenuation (dB). 9 and 1
As is clear from 0, the reflection characteristic and the transmission characteristic of the coupler 11 are good over a wide band. The coupler 1
The thickness of the insulating disc 11 ₅₁ and 11 ₅₂ in 1, which was selected according to the transmission frequency band, it is possible to increase the bandwidth by increasing the thickness from the thickness of the selected. In FIG. 11, the dimensions of each part of the coupler 11 are selected in the same manner as the values described with reference to FIG. 9, and as shown in FIG. 2, the 90 ° 3 dB hybrid circuit 12 is connected via the coaxial cables 13 ₁ and 13 _2. In a rotary type phase shifter in which the coupler 11 is connected to a coupler 11
By rotating 1 ₁ or 11 ₂ relatively around a common cylindrical axis, the inside of the exciter element 11 ₆₂ and the coaxial connector 11 ₃₂ in the second exciter installed inside the shield case 11 ₂ side A straight line connecting the connection point with the conductor 11 ₄₂ and the center of the exciting element 11 ₆₂ , that is, the X axis and the exciting element 11 ₆₁ in the first exciter installed on the side of the shield case 11 ₁ Observing the phase change of the output E ₁ of the coaxial plug 11 ₃₃ and the output E ₂ of the coaxial plug 11 ₃₂ when the deflection angle φ formed with the electric field vector E is changed to 90 ° and 135 ° with 45 ° as the reference. The results show that both outputs E ₁ and E ₂ have the same relationship between the change in the deviation angle φ and the absolute value of the change in phase without depending on the transmission frequency, and the outputs E ₁ and E ₂ are The sign of the phase is different. Therefore, the phase difference between the outputs E ₁ and E ₂ is 2φ with respect to the change in the deviation angle φ. The horizontal axis in FIG. 11 is the same as in FIG. 9, and the vertical axis is the declination angle φ, that is, the amount of phase shift (°) with respect to the relative rotation angle φ of the shield cases 11 ₁ and 11 ₂ . FIG.
Is the case with the same conditions of observation and the results are shown in Figure 11, a coaxial connector 11 ₃₁ output terminal 12 ₃ and between coupler 11 of coupler 11 coaxial connector 11 ₃₁ and 90 ° 3 dB hybrid circuit 12 It is a figure which shows the result of having observed each transmission attenuation amount between the output terminals 12 _{4 of the} 90 ° 3 dB hybrid circuit 12.
The horizontal axis is the same as in FIG. 11, and the vertical axis is the transmission attenuation amount (dB). As is clear from FIG. 12, compared with the transmission attenuation in the case of only the coupler 11 shown in FIG.
The transmission loss increases by adding the dB hybrid circuit 12 and the coaxial cables 13 ₁ and 13 ₂ ,
The difference in the change in the amount of phase shift of the output E ₁ and E ₂ with respect to the change in the angle phi, the amplitude difference between the output E ₁ and E ₂ are not substantially observed.

Returning to FIG. 1, the rotary type phase shifters 4 ₁ to 4
Explaining the connection relationship from each output terminal of ₃ to the antenna blocks 10 ₁ to 10 ₆ forming an array antenna in the vertical direction, the terminal 5 ₁ is a phase shift amount adjusting transmission line 6
₁ , the terminal 7 ₁ and the feed line 8 ₁ are connected to the antenna block 10 ₁ , and the terminals 5 _{2 and} below are also connected to the antenna block via the line and the terminal having the same suffix. Even when the number of antenna blocks is appropriately increased or decreased from the number shown in FIG. 1, the terminals and lines are increased or decreased according to the increase or decrease, and the same connection as described above is performed.
It rotary phase shifter 4 ₁ 4 _3, since each include two output terminals, by providing a number of _^1/2 of the rotary phase shifter of an antenna block, the output of the rotary phase shifter The terminal can correspond to the antenna block. In associating the output terminals of the rotary type phase shifters 4 ₁ to 4 ₃ with the terminals 5 ₁ to 5 ₆ , _{one of the} output terminals of the rotary type phase shifters 4 ₁ to 4 ₃ (Fig. The output terminal 12 ₃ in FIG. 2, that is, the output terminal of the positive output) is made to correspond to the terminals 5 ₁ to 5 ₃ corresponding to the upper half of the antenna blocks 10 ₁ to 10 ₆ , and the rotary phase shifters 4 ₁ to 4 ₃ Of the output terminals of 4 _3, the other output terminal (the output terminal 12 ₄ in FIG. 2, that is, the output terminal of the negative output) is connected to the antenna blocks 10 ₁ to 10 10.
₆ together correspond to 5 to ₆ to the terminal 5 ₄ not corresponding to the lower half of the, to to no rotary phase shifter 4 ₁ and 4 each one of the output terminals of ₃ and the other output terminal, the antenna block 10 ₁ 10 Terminals 5 ₁ to 5 ₃ corresponding to the upper half of ₆ ,
It is connected to terminals 5 ₁ to 5 ₆ which are symmetrical with respect to a virtual boundary surface between terminals 5 ₄ to 5 ₆ corresponding to the lower half of the antenna blocks 10 ₁ to 10 ₆ . For example, one output terminal of the rotary type phase shifter 4 ₁ is connected to the terminal 5 ₂ .
The other output terminal is terminal 5 ₅ , one output terminal of the rotary phase shifter 4 ₂ is terminal 5 ₃ and the other output terminal is terminal 5 ₄
, One output terminal of the rotary type phase shifter 4 ₃ to the terminal 5 ₁ ,
The other output terminal is connected to the terminal 5 ₆ . Regarding the lengths of the transmission lines 6 ₁ to 6 ₆ for adjusting the amount of phase shift,
As will be described later, each length of the feed lines 8 ₁ to 8 ₆ is formed so that all the lengths are equal to each other.

The excitation power applied to the terminal 1 is divided into 3 by the power distributor 2, and the distribution output is the terminals 3 ₁ to 3
₃ to 4 ₁ rotary phase shifter through added to 4 _3, the outputs of from 4 ₁ type phase shifter rotation 4 _3, terminals 5 ₁ to 5 _6, to the transmission line 6 ₁ for the phase shift adjustment 6 ₆ , terminal 7 ₁
Through 7 ₆ and feed lines 8 ₁ through 8 ₆ are applied to the antenna blocks 10 ₁ through 10 ₆ . The tilt angle T (°) of the array antenna is approximately given by the following equation.

(Equation 2) λ (mm): Working wavelength (radiation or reception wavelength) P (°): Phase difference between radiation waves (or reception waves) from adjacent element antennas Cd (mm): Radiation surface (or reception surface) of adjacent element antennas Wavefront) Mutual center spacing Now, the frequency of the excitation power is 900MHz, therefore
The wavelength λ used is 300 / 0.9 (mm), the center distance Cd between the radiation surfaces of adjacent element antennas is 200 (mm)
In order to set the tilt angle T to, for example, about 2 °, it is necessary to form the phase difference P between the radiation waves from the adjacent element antennas to be 7.5 ° from the formula (4). is there. For convenience of explanation, the transmission lines 6 ₁ to 6 ₆ for adjusting the amount of phase shift are removed, and the respective outputs of the rotary type phase shifters 4 ₁ to 4 ₃ are connected to terminals 5 ₁ to 5 ₆ , terminals 7 ₁ to 7 ₆ and a feed line. Antenna block 10 via 8 ₁ to 8 _6
If it is formed to be added to ₁ to 10 ₆ ,
, The antenna blocks 10 ₁ to 10 ₆ each include four element antennas.
In order to make the phase difference P between the radiation waves from the adjacent element antennas 7.5 °, the rotary type phase shifters 4 ₁ to 4 ₃
Of the terminals 5 ₁ to 5 ₆ to which the respective outputs are applied, the phase difference between the outputs applied to the adjacent terminals is 30 ° (=
It is necessary to form so as to form 7.5 ° × 4). The rotary phase shifters 4 ₁ to 4 ₃ are set to the rotary phase shifter 4
₁ to 4 ₃ are represented by relative rotation angles between the first and second exciters forming the rotary phase shifters 4 ₁ to 4
By the angle of rotation given the outputs + code of each one of the output terminals of the _3, the output of each other output terminal - and be expressed at a rotation angle indicated by symbol, of from rotary phase shifter 4 ₁ 4 ₃ Assuming that the connection between each output and the terminals 5 ₁ to 5 ₆ is as shown in FIG. 1, the phase difference between the outputs applied between the adjacent terminals of the terminals 5 ₁ to 5 ₆ is 30 °. To achieve this, for example, the rotation angle of the rotary phase shifter 4 ₁ should be 45
°, the rotation angle of the 15 ° of the rotary phase shifter 4 _2, choose the rotation angle of the rotary phase shifter 4 ₃ 75 °, to 4 ₁ rotary phase shifter is added to 5 to ₆ 5 ₁ terminal The output of 4 ₃ is + 75 °, + 45 °, + 15 °, -15 sequentially from the terminal 5 _1.
°, -45 ° and -75 °, and the phase difference between the outputs applied to terminals 5 ₁ and 5 ₂ is + 75 °-(+ 45 °).
= 30 °, the phase difference between the outputs applied to terminals 5 ₂ and 5 ₃ is + 45 ° − (+ 15 °) = 30 °, terminals 5 ₃ and 5 ₄
The phase difference between the outputs applied to is + 15 °-(-15
°) = 30 °, the phase difference between the outputs applied to terminals 5 ₄ and 5 ₅ is −15 ° − (− 45 °) = 30 °, the phase difference between the outputs applied to terminals 5 ₅ and 5 ₆ is , -45 °-(-7
5 °) = 30 °. Use wavelength λ in equation (4),
When the center distance Cd between the radiation surfaces of the adjacent element antennas and the phase difference P between the radiation waves from the adjacent element antennas are determined as described above, the tilt angle T becomes approximately 2 °,
Further, even if the transmission frequency (use frequency) in the rotary type phase shifters 4 ₁ to 4 ₃ changes, the phase difference between the outputs does not change. As described with reference to FIGS. When the transmission frequency (use frequency) of the phase shifters 4 ₁ to 4 ₃ changes, the tilt angle T changes. That is, from the equation (4), T (°) is almost proportional λ (mm) × P (°) (5) When the wavelength λ (mm) is replaced by the frequency f (MHz), T (°) is almost If the proportional P (°) / f (MHz ) ···· (6) no rotary phase shifter 4 ₁ to the transmission frequency of 4 ₃ (use frequency) is changed, lambda shown in formula (5) ( mm) × P (°) or P (°) / f (MHz) shown in the equation (6) changes. That is, when the use wavelength of the rotary type phase shifters 4 ₁ to 4 ₃ is short (the use frequency is high), the tilt angle T (°) becomes shallow, and conversely, when the use wavelength is long (the use frequency is low), The tilt angle T (°) becomes deep.

In FIG. 13, the transmission lines 6 ₁ to 6 ₆ for adjusting the amount of phase shift in FIG. 1 are omitted, and the rotary type phase shifters 4 ₁ to 4 are omitted.
The prototype of the tilt angle control device formed so as to excite the antenna blocks 10 ₁ to 10 ₆ by adding the output of ₃ directly to the power feeding lines 8 ₁ to 8 ₆ was used as a prototype for the 800 MHz band digital car telephone system (transmission frequency is 810 MHz. To 826MHz, reception frequency 940MHz to 95
A diagram showing a frequency characteristic of the tilt angle when mounted on the base station antenna height 5m in 0 MHz), the horizontal axis represents the tilt angle set value (°), i.e., rotary phase shifter 4 ₁ to 4 ₃ The tilt angle is set by adjusting each rotation angle appropriately, the vertical axis is the realization value of the tilt angle, that is, the tilt angle actually obtained, the thin solid line connecting the circles is the transmission frequency band and the reception frequency band (the used frequency Frequency of the center of 8)
A change characteristic of the tilt angle at 85 MHz, and a thick vertical solid line indicates a change range of the tilt angle in the frequency range of 810 MHz to 956 MHz. As is apparent from FIG. 13, when the set value of the tilt angle is large (deep), the actual tilt angle is different by 1 ° or more between the transmission and the reception, so that the transmission frequency band and the reception frequency band are different. In some cases it is difficult to share the antenna. Therefore, in the present invention, as shown in FIG. 1, the phase shift amount adjusting transmission lines 6 ₁ to 6 ₆ are inserted and connected between the terminals 5 ₁ to 5 ₆ and the terminals 7 ₁ to 7 ₆ to shift the phase. The lengths of the quantity adjusting transmission lines 6 ₁ to 6 ₆ are set as follows, for example. Among the transmission lines 6 ₁ to 6 ₆ for adjusting the amount of phase shift, the transmission line 6 for adjusting the amount of phase shift connected between the terminal 5 ₁ and the feeding line 8 ₁ to the antenna block 10 _{1 at the} uppermost stage.
Except ₁ and amount of phase shift adjustment transmission line 6 ₆ connected between the terminal 5 ₆ and the feeding line 8 ₆ to the bottom of the antenna block _106, the terminal 5 _{2-5 5} and the intermediate stage antenna block Feed lines 8 ₂ to 8 to 10 ₂ to 10 _5
The lengths of the transmission lines 6 ₂ to 6 ₅ for adjusting the amount of phase shift, which are connected between the transmission lines 6 and ₅ , are appropriately equal to each other, and the length of the transmission line 6 ₁ for adjusting the amount of phase shift is adjusted. In comparison with the lengths of the transmission lines 6 ₂ to 6 ₅ for adjusting the amount of phase shift, the phase angle is approximately 360 ° at a frequency approximately in the middle of the used frequency band (frequency intermediate between the transmission frequency band and the reception frequency band). The length of the phase shift amount adjusting transmission line 6 ₆ is shortened by an amount corresponding to the length of the phase shift amount adjusting transmission line 6 ₂ to 6 ₅ Almost 36 at the corner
It is formed longer by 0 °. When the lengths of the transmission lines 6 ₁ to 6 ₆ for adjusting the amount of phase shift are set as described above, the lengths of the transmission lines 6 ₁ and 6 ₆ for adjusting the amount of phase shift are substantially equal to the intermediate frequency of the used frequency band. However, compared with the length of the transmission lines 6 ₂ to 6 ₅ for adjusting the amount of phase shift in the middle, the phase angle is approximately 36
Since they differ only by 0 °, this case is equivalent to the case where the lengths of the transmission lines 6 ₁ to 6 ₆ for adjusting the amount of phase shift are all substantially equal, and the tilt angle is equal to the rotary phase shifter 4 ₁ to 6 _6. This is equal to the tilt angle set by each rotation angle of 4 ₃ . When the used frequency is higher than the frequency approximately in the middle of the used frequency band, the phase difference corresponding to the phase angle of 360 ° increases in proportion to the frequency. Therefore, the equivalent length of the phase shift amount adjusting transmission line 6 ₁ Becomes shorter than the actual length, and the equivalent length of the transmission line 6 ₆ for adjusting the amount of phase shift becomes longer than the actual length. Therefore, when the used frequency is higher than the frequency approximately in the middle of the used frequency band. In addition, the tilt angle changes in the direction of deepening, and conversely, when the use frequency is lower than the frequency approximately in the middle of the use frequency band, the tilt angle changes in the direction of shallowing. The relationship between the direction of change in the used frequency and the change in tilt angle is obtained when the transmission lines 6 ₁ to 6 ₆ for adjusting the phase shift amount are omitted and when the transmission lines 6 ₁ to 6 ₆ for adjusting the phase shift amount are inserted and connected. Since and are in the opposite directions, the tilt angle can be kept substantially constant regardless of the change in the used frequency.

FIG. 14 shows that the tilt angle control device of the present invention shown in FIG. 1 is attached to a base station antenna under the same conditions as in the actual measurement of FIG. 13, that is, the conditions of use frequency and antenna height are the same. In the graph showing the frequency characteristics of the tilt angle in the case of the above, the horizontal axis and the vertical axis are the same as in FIG. 13, and the characteristics represented by the thick solid line and the thin solid line are also the same as in FIG. As is clear from FIG. 14, when the tilt angle setting value is in the middle of the setting range, the change in tilt angle with respect to the change in operating frequency is so small that it can be ignored, and the tilt angle setting value in the entire tilt angle setting range is small. The change characteristic is also much improved as compared with the case of FIG.

In connecting the output terminals of the rotary type phase shifters 4 ₁ to 4 ₃ and the terminals 5 ₁ to 5 ₆ as long as the connection conditions as described below are satisfied, connections other than those shown in FIG. Is possible. That is, among the output terminals of the plurality of rotary phase shifters, the output terminal for positive output is connected to the feed line to the antenna in the upper half of the array antenna in the vertical direction for phase shift adjustment transmission. The amount of phase shift that is connected to the line and the output terminal of the negative output of the output terminals of the multiple phase shifters is connected to the feed line to the antenna in the lower half of the vertical array antenna. Connect to the adjustment transmission line,
The positive output terminal and the negative output terminal of each of the plurality of rotary phase shifters correspond to the upper half of the vertical array antenna, and the phase shift amount adjusting transmission line and the vertical array are arranged. The transmission line for adjusting the amount of phase shift is connected to the transmission line for adjusting the amount of phase shift corresponding to the lower half of the antenna, which is symmetrical with respect to the virtual boundary plane. For example, the terminal 5 one of the output terminals of the rotary phase shifter 4 ₁ (positive polarity main side) shown in FIG. 1 ₁
, The other output terminal (negative output side) to the terminal 5 ₆ , one output terminal (positive main output side) of the rotary phase shifter 4 ₂ to the terminal 5 ₂ and the other output terminal (negative output) Side) to terminal 5 ₅
, One output terminal (positive polarity main side) of the rotary type phase shifter 4 ₃ is connected to the terminal 5 ₃ and the other output terminal (negative polarity output side) is connected to the terminal 5 ₄ , respectively, and the tilt angle reference When the value is to be set to approximately 2 °, the rotation angles of the rotary type phase shifters 4 ₁ to 4 ₃ are adjusted to 75 °, 45 ° and 15 °, respectively. In addition, one output terminal (positive polarity main side) of the rotary type phase shifter 4 ₁ is connected to the terminal 5 ₃ and the other output terminal (negative polarity output side) is connected to the terminal 5 ₄ and the rotary type phase shifter 4 ₂ is connected. One output terminal (positive polarity main side) is connected to the terminal 5 ₁ , the other output terminal (negative polarity output side) is connected to the terminal 5 ₆ , and the rotary phase shifter 4 ₃
One output terminal (positive polarity main side) to the terminal 5 _2, to the other output terminal pin 5 ₅ (negative polarity output side), respectively connected, tries to set a reference value of the tilt angle approximately 2 ° In that case, the rotation angles of the rotary phase shifters 4 ₁ to 4 ₃ are adjusted to 15 °, 75 ° and 45 °, respectively.
When the reference value of the tilt angle is set to a value other than 2 °, the rotation angle of each rotary phase shifter is appropriately adjusted according to the value of the tilt angle.

In the embodiment of the invention shown in FIG.
With the exception of the transmission lines 6 ₁ to 6 ₆ for adjusting the amount of phase shift, the terminals 5 ₁ to 5 ₆ to which the outputs of the rotary phase shifters 4 ₁ to 4 ₃ are added are directly connected to the power supply lines 8 ₁ to 8 ₆ , By setting the required reference value of the tilt angle of the array antenna only by adjusting the rotation angles of the rotary phase shifters 4 ₁ to 4 ₃ and inserting and connecting the transmission lines 6 ₁ to 6 ₆ for adjusting the phase shift amount, the array to compensate for the frequency characteristic of the tilt angle of the antenna, by to 4 ₁ type phase shifter rotate to adjust the rotation angles of the 4 _3, has been configured so as freely changing the tilt angle, Figure 15 is a tilt It is a figure for demonstrating an example in which the setting method of the required reference value of a corner differs from the Example shown in FIG. In FIG. 15, first, the rotary phase shifter 4
_With all the rotation angles of ₁ to 4 ₃ held at zero,
Of the phase shift amount adjusting transmission lines 6 ₁ to 6 ₆ , the difference in length between adjacent phase shift amount adjusting transmission lines, 6 ₂ −6 ₁ , 6 ₃ −.
6 _2, 6 ₄ -6 _3, 6 _{5-6 4} and ₆ 6 -6 _5, out of the antenna block 10 ₁ to 10 _6, a length corresponding to the phase difference between the synthetic wave radiation cross from adjacent antenna block To be selected. Also in the antenna shown in FIG. 15, the case where each antenna block is composed of four element antennas is shown as an example. Therefore, the difference in length between the adjacent transmission lines for adjusting the amount of phase shift is expressed by equation (4). A length corresponding to four times P in P will be selected. After setting the required reference value of the tilt angle, the tilt angle can be changed by appropriately adjusting the rotation angles of the rotary phase shifters 4 ₁ to 4 ₃ . Other reference numerals and configurations in FIG.
It is similar to FIG.

FIG. 16 shows the tilt angle control device of the present invention shown in FIG. 15 under the same conditions as in the observation of FIG.
FIG. 13 is a diagram showing frequency characteristics of tilt angles when the antenna is attached to a base station antenna in which the conditions of use frequency and antenna height are the same. The horizontal axis and the vertical axis are the same as in FIG. The characteristics shown are also the same as in FIG. As is apparent from FIG. 16, even when the tilt angle control device of the present invention shown in FIG. 15 is attached to the array antenna, when the tilt angle setting value is in the middle of the setting range, the tilt with respect to the change in the operating frequency is changed. The change in angle is negligibly small, and the change characteristic in the entire tilt angle setting range is much improved as compared with the case of FIG.

With all the rotation angles of the rotary type phase shifters 4 ₁ to 4 ₃ kept at zero, the phase shift amount adjusting transmission line 6 ₁
To 6 ₆ of the length differences between the transmission lines for adjusting the amount of phase shift, which are vertically adjacent to each other, 6 ₂ −6 ₁ , 6 ₃ −6 ₂ , 6 ₄ −6 ₃ ,
6 _{5-6 4} and ₆ 6 -6 _5, the antenna block 10 ₁
To 10 ₆ instead of setting the length corresponding to the phase difference between the combined radiation waves from the adjacent antenna blocks, the length of the phase shift amount adjusting transmission line 6 ₁ corresponding to the uppermost antenna block 10 _1. shortest form, according to reach the amount of phase shift adjustment transmission line 6 ₆ corresponding to the antenna block ₁₀₆ of the lowermost stage, may be formed to be sequentially appropriately long is.

1 and 15, a rotary type phase shifter
Although the case where the number of antenna blocks is provided is illustrated, the number is appropriately increased or decreased according to the number of antenna blocks. As described above, for example, when there are two antenna blocks, one rotary phase shifter is used. One is provided, one output terminal of which is connected to the power feed line corresponding to the antenna block of the upper stage through the transmission line for adjusting the amount of phase shift corresponding to the antenna block of the upper stage, and the other output terminal of the rotary phase shifter is connected. While connecting to the feed line corresponding to the lower antenna block via the transmission line for adjusting the phase shift amount corresponding to the lower antenna block, the length of the transmission line for adjusting the phase shift amount corresponding to the upper antenna block, The present invention can be implemented by appropriately shortening the length of the transmission line for adjusting the amount of phase shift corresponding to the lower antenna block. Also in this embodiment, by the same method as that described with reference to FIG.
A required reference value for the tilt angle can be set. Also,
Even when one rotary phase shifter is provided, the rotary phase shifter is connected to the feed line to the antenna block in the upper stage in a state where the rotation angle of the rotary phase shifter is kept at zero, as in the method described with reference to FIG. The length of the transmission line for adjusting the amount of phase shift (6 _U ),
Difference from the length of the phase shift amount adjusting transmission line (6 _L ) connected to the power feeding line to the lower antenna block 6 _L- 6
The required reference value of the tilt angle can also be set by selecting _U to a length corresponding to the phase difference between the combined radiation waves from the upper and lower antenna blocks. In addition, the transmission line 6 _U for adjusting the amount of phase shift corresponding to the upper antenna block
May be appropriately shorter than the length of the phase shift amount adjusting transmission line 6 _L corresponding to the lower antenna block.

The case where the transmission line for adjusting the amount of phase shift is connected to the power feeding line to the antenna block constituting the array antenna has been described above. In this case, the present invention can be implemented by connecting a transmission line for adjusting the amount of phase shift to a power feeding line to each element antenna.

[0022]

According to the tilt angle control device of the present invention, a rotary type phase shifter and a transmission line for adjusting the amount of phase shift of a required length are combined to change the tilt angle to adjust the rotational angle of the rotary type phase shifter. The tilt angle can be changed extremely easily and quickly as compared with the conventional device shown in FIG.
The tilt angle can be continuously and finely adjusted, and the set value and the actual value of the tilt angle can be made to substantially coincide with each other over a relatively wide frequency band. This is extremely effective for controlling the tilt angle of the array antenna for both transmission and reception in the communication system in which the frequency band is different.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration of a main element of the device of the present invention.

FIG. 3 is a diagram illustrating a configuration of a main element of the device of the present invention.

FIG. 4 is a diagram illustrating a configuration of a main element of the device of the present invention.

FIG. 5 is a diagram illustrating a configuration of a main element of the device of the present invention.

FIG. 6 is a diagram illustrating a configuration of a main part element of the device of the present invention.

FIG. 7 is a diagram illustrating a configuration of a main element of the device of the present invention.

FIG. 8 is a diagram for explaining the operation of main elements of the device of the present invention.

FIG. 9 is a diagram illustrating operating characteristics of main elements of the device of the present invention.

FIG. 10 is a diagram for explaining operating characteristics of essential elements of the device of the present invention.

FIG. 11 is a diagram illustrating operating characteristics of main elements of the device of the present invention.

FIG. 12 is a diagram illustrating operating characteristics of main elements of the device of the present invention.

FIG. 13 is a diagram for explaining the operation of the device of the present invention.

FIG. 14 is a diagram for explaining the operation of the device of the present invention.

FIG. 15 is a diagram illustrating another embodiment of the present invention.

FIG. 16 is a view for explaining the operation of the device of the present invention.

FIG. 17 is a diagram illustrating a conventional device.

[Explanation of symbols]

1 Input Terminal 2 Power Distributor 3 _{1 to} 3 ₆ Terminal 4 ₁ to 4 ₃ Rotational Phase Shifter 5 _{1 to} 5 ₆ Terminal 6 _{1 to} 6 ₆ Transmission Line for Phase Shift Amount Adjustment 7 _{1 to} 7 ₆ Terminal 8 ₁ 8 ₆ Feeding line 9 _{1 to} 9 ₂₄ Element antenna 10 ₁ to 10 ₆ Antenna block 11 Coupler 11 ₁ and 11 ₂ Shield case 11 _{31 to} 11 ₃₃ Coaxial plug 12 90 ° 3 dB hybrid circuit 12 ₁ Input terminal 12 ₂ Isolation terminals 12 ₃ and 12 ₄ Output terminals 13 ₁ and 13 ₂ Coaxial line 11 _{41 to} 11 ₄₃ Inner conductor of coaxial connector 11 ₅₁ and 11 ₅₂ Insulating disk 11 ₆₁ and 11 ₆₂ Metal plate

Claims (7)

[Claims] 1. A power distributor connected to an excitation power input terminal, a plurality of rotary phase shifters connected to a distribution output terminal of the power distributor, and a plurality of rotary phase shifters. Of each of the output terminals and a transmission line for adjusting the amount of phase shift inserted and connected between the feed line to the antenna forming the vertical array antenna, and the rotary phase shifter has an input terminal. A first exciter that is excited by an input applied via the first exciter to generate a linearly polarized wave; a second exciter in which two orthogonal components of the linearly polarized wave generated by the first exciter are coupled; The second exciter has a shield case internally rotatably mounted around an axis connecting the centers of both exciters, and a linearly polarized wave orthogonal to the second exciter coupled to the second exciter. And a circuit for synthesizing the two outputs generated by the components. Array antenna tilt angle control device. 2. A phase shift amount in which a positive output terminal of the output terminals of the plurality of rotary phase shifters is connected to a feed line to the antenna in the upper half of the vertical array antenna. Connect to the adjustment transmission line, and connect the negative output terminal of the output terminals of the multiple phase shifters to the feed line to the antenna in the lower half of the vertical array antenna. Connected to the transmission line for adjusting the amount of phase shift, the output terminal for positive output and the output terminal for negative output of each of the plurality of rotary phase shifters are connected to the upper half of the vertical array antenna. The transmission line for adjusting the amount of shift and the transmission line for adjusting the amount of phase shift corresponding to the lower half of the array antenna in the vertical direction are connected to the transmission line for adjusting the amount of phase shift that is symmetric with respect to the virtual boundary plane. Of the transmission lines for phase adjustment, it corresponds to the top and bottom antennas. Except for the phase shift amount adjustment transmission line, the lengths of the phase shift amount adjustment transmission lines corresponding to the intermediate stage antennas are made equal to each other, and the length of the phase shift amount adjustment transmission line corresponding to the top stage antenna is set , Compared with the length of the transmission line for adjusting the amount of phase shift corresponding to the antenna in the middle stage, the phase angle is shortened by about 360 ° at a frequency approximately in the middle of the used frequency band, and corresponds to the antenna in the lowest stage. Compare the length of the transmission line for adjusting the amount of phase shift to the length of the transmission line for adjusting the amount of phase shift corresponding to the antenna in the intermediate stage, and at a frequency approximately in the middle of the used frequency band, a phase angle of approximately 360 ° The tilt angle control device for an array antenna according to claim 1, wherein the tilt angle control device is formed to be long, and the lengths of feed lines to each antenna are formed to be equal to each other. 3. A phase shift amount in which a positive output terminal of the output terminals of the plurality of rotary phase shifters is connected to a feed line to the antenna in the upper half of the vertical array antenna. Connect to the adjustment transmission line, and connect the negative output terminal of the output terminals of the multiple phase shifters to the feed line to the antenna in the lower half of the vertical array antenna. Connected to the transmission line for adjusting the amount of phase shift, the output terminal for positive output and the output terminal for negative output of each of the plurality of rotary phase shifters are connected to the upper half of the vertical array antenna. Connected to the transmission line for adjusting the amount of phase shift that is symmetric with respect to the virtual boundary plane between the transmission line for adjusting the amount of shift and the transmission line for adjusting the amount of phase shift corresponding to the lower half of the vertical array antenna. Of the transmission line for adjusting the amount of phase shift The length of the adjustment transmission lines, compared to the length of the phase shift adjustment transmission line corresponding to the lower antenna,
2. The antenna according to claim 1, wherein the antenna is formed to be short by a length substantially corresponding to the phase difference between the radiated wave of the upper antenna and the radiated wave of the lower antenna, and the lengths of feed lines to the respective antennas are equal to each other. Array antenna tilt angle control device. 4. A phase shift amount in which a positive output terminal of the output terminals of the plurality of rotary phase shifters is connected to a feed line to the antenna in the upper half of the vertical array antenna. Connect to the adjustment transmission line, and connect the negative output terminal of the output terminals of the multiple phase shifters to the feed line to the antenna in the lower half of the vertical array antenna. Connected to the transmission line for adjusting the amount of phase shift, the output terminal for positive output and the output terminal for negative output of each of the plurality of rotary phase shifters are connected to the upper half of the vertical array antenna. The transmission line for adjusting the amount of shift and the transmission line for adjusting the amount of phase shift corresponding to the lower half of the array antenna in the vertical direction are connected to the transmission line for adjusting the amount of phase shift that is symmetrical with respect to the virtual boundary plane. Set the length of the phase adjustment transmission line to the phase adjustment adjustment transmission that corresponds to the topmost antenna. The transmission line for adjusting the amount of phase shift corresponding to the lowest stage antenna is formed so as to become longer sequentially, and the lengths of the feed lines to each antenna are formed to be equal to each other. Tilt angle control device for array antenna. 5. A rotary phase shifter connected to an input terminal of excitation power, an output terminal of the rotary phase shifter, and a feed line to an antenna forming a vertical array antenna. A transmission line for adjusting the amount of phase shift inserted and connected between the first and second rotary exciters, wherein the rotary phase shifter is excited by an input applied via an input terminal to generate a linearly polarized wave; A second exciter in which two orthogonal orthogonal polarization components generated by the first exciter are coupled, and the first and second exciters are relatively arranged around an axis connecting the centers of both exciters. Shield cage rotatably installed inside
And a circuit for synthesizing two outputs generated by two orthogonal components of linearly polarized waves coupled to the second exciter, the tilt angle control device for an array antenna. 6. A positive output terminal of a rotary type phase shifter,
The amount of phase shift that is connected to the transmission line for adjusting the amount of phase shift connected to the feed line to the antenna in the upper stage, and the output terminal of the negative output of the rotary phase shifter is connected to the feed line to the antenna in the lower stage. While connecting to the adjustment transmission line, the length of the phase shift amount adjustment transmission line corresponding to the upper antenna is formed shorter than the length of the phase shift amount adjustment transmission line corresponding to the lower antenna, The tilt angle control device for an array antenna according to claim 5, wherein the feed lines to each antenna are formed to have the same length. 7. A positive polarity output terminal of a rotary type phase shifter,
The amount of phase shift that is connected to the transmission line for adjusting the amount of phase shift connected to the feed line to the antenna in the upper stage, and the output terminal of the negative output of the rotary phase shifter is connected to the feed line to the antenna in the lower stage. Connect to the adjustment transmission line, and compare the length of the phase shift amount adjustment transmission line corresponding to the upper antenna with the length of the phase shift amount adjustment transmission line corresponding to the lower antenna. 6. The array antenna according to claim 5, wherein the radiated wave of 1) and the radiated wave of the lower antenna are formed to be short by a length substantially corresponding to the phase difference, and the lengths of feed lines to the respective antennas are formed to be equal to each other. Tilt angle control device.