JPH0964640A - Radio terminal equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hold the gain of an antenna system at a high value by executing manual setting adapted to the inclined states of two antennas to be individualy matched with two polarized waves to be cross polarization. SOLUTION: Since two antennas 111, 112 individually matched with 1st and 2nd polarized waves to be cross polarization are fixed to a mobile object, receiving polarized waves arriving at the antennas 111 , 112 are deflected from the 1st and 2nd polarized waves at the movement of the mobile object and the inclination angles of the antennas 111 , 112 are changed. When a person carries the mobile object, the polarity of the inclination angles is inverted in accordance with its carrying method. Thereby power corresponding to a vector sum formed by a synthesizing means 17 on the single feeding line of the antenna 111 or 112 is changed in accordance with the inclination angle. Under the interface of a man-machine interface means 13, the phase shift quantity of one or both of the feeding lines of the antennas 111 , 112 adapted to inclinations are variably set up. Since the vector sum to be a phase difference obtained by emphasizing a received wave can be obtained as a synthetic wave, high receiving power can be maintained, and during transmission, gain can be held at a high value by the reversibility of antenna characteristics.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless terminal device mounted on a mobile body or carried by an operator to access a wireless transmission path via a linear antenna or a plate antenna.

[0002]

2. Description of the Related Art Generally, in a mobile communication system, a radio transmission line is formed between a base station and a mobile station via a vertically polarized antenna. Therefore, among such mobile stations, a portable mobile station (hereinafter, a device that constitutes such a mobile station is simply referred to as a “terminal device”) has an expandable and contractible structure, and has the above-mentioned radio. A monopole antenna that is suitable for a transmission line and has an overall length of 1/4 wavelength to 1 wavelength and excellent portability is often used.

Further, as an antenna system applicable to a terminal device, for example, as disclosed in JP-A-61-250004, a horizontal dipole antenna is provided above the terminal device, or JP-A-6-206. As disclosed in Japanese Patent Laid-Open No. 53719, there has been proposed a configuration in which a mechanism for tilting the antenna is added to the bottom of the antenna.

[0004]

However, among the above-mentioned conventional examples, regarding the terminal device adopting the monopole antenna having the expandable structure and the terminal device having the horizontal dipole antenna, these terminal devices are used. Is generally used in a state of being tilted by 40 to 60 degrees, so that the longitudinal direction of the elements of these antennas intersects with the plane of polarization, and the effective gain is reduced, for example, as shown by the solid line in FIG. It was operated in the state where it did.

Regarding the horizontal dipole antenna, the larger the angle is, the higher the gain becomes. On the contrary, when the angle is small, the gain is small, so that it is often not applicable to the terminal device. Furthermore, with regard to the above-mentioned mechanism, it is technically difficult to realize movable and portable portability while maintaining downsizing, weight reduction, and cost reduction, and the antenna moves unnecessarily during use. It was difficult to apply in practice because the operational comfort and operability are likely to be impaired.

As a solution to these problems,
For example, the average value of the angles described above (for example, 45 degrees)
There is a configuration in which the element of the antenna is attached to the main body of the terminal device in a state where the element of the antenna is inclined in advance. However, in such a configuration, if the antenna is expandable and retractable and cannot be stored in the housing of the terminal device, the antenna hinders the comfort of carrying, and even if it can be stored, Since such an antenna is housed in a part of the housing in a tilted state, there is a high possibility that mounting inside the housing will be restricted and miniaturization will be hindered. Furthermore, since the angle of inclination described above is fixed, it is difficult to adapt that the terminal device can be held in both the right hand and the left hand of the operator, and the effective gain of the antenna depends on the holding mode. It dropped significantly and could not be applied in practice.

It is an object of the present invention to provide a wireless terminal device capable of suppressing a decrease in the gain of the antenna system while adapting to the actual environment related to installation and operation.

[0008]

FIG. 1 is a block diagram showing the principle of the first aspect of the present invention.

According to the first aspect of the present invention, two antennas 11 ₁ which are installed or supported by a moving body and are individually matched to a first polarized wave and a second polarized wave which are cross polarized waves, 1
1 ₂ and the feeding paths of the _two antennas 11 ₁ and 11 ₂ , the man-machine interface means 13 that serves as a man-machine interface relating to the setting of the difference in the amount of phase shift, and the feeding paths of the two antennas 11 ₁ and 11 ₂ . The difference in the amount of phase shift is set to 2nπ radians or (2n ± 1) π radians with respect to the integer n according to the setting provided via the man-machine interface unit 13 on either one or both sides. Variable phase shifter 15 and two antennas 11 ₁ and 11 ₂
1 for synthesizing the power feeding paths of 1 to form a single power feeding path
7 and a transmitting / receiving means 19 which is connected to a single power feeding path formed by the synthesizing means 17 and which transmits or receives a radio frequency signal through the power feeding paths of the _two antennas 11 ₁ and 11 ₂ and these antennas. It is characterized by having.

FIG. 2 shows the principle block of the invention according to claim 2.
FIG. According to the invention of claim 2, the moving body is equipped with
Or supported, with a first polarization that is cross-polarized with each other
Two antennas 11 individually matched to the second polarization₁,
11₂And two antennas 11₁, 11₂The power supply path of
Transfer of 2nπ radians and (2n ± 1) π radians for n
They are combined separately by the difference in the amount of phase, and each is combined with the first combined feed line.
A branching and combining means 21 forming a second combined feed line,
Selection of either one of the first combined feed line and the second combined feed line
Manmashi with a man-machine interface for selection
Interface means 23, the first combined feed line and the second
One of the combined power supply lines of
Selection under the man-machine interface that the source means 23 takes.
The selecting means 25 to select and the first combination via the selecting means 25.
Connected to either the combined feed line or the second combined feed line,
Diversifying means 21, two antennas 11 ₁, 11₂ Power supply
Channels and transmit radio frequency signals through these antennas
And a transmission / reception means 27 for receiving or receiving
Sign.

FIG. 3 is a block diagram showing the principle of the invention described in claim 3. In the invention according to claim 3, two antennas 11 ₁ which are installed or supported by a moving body and individually matched with a first polarized wave and a second polarized wave which are mutually cross polarized waves,
11 ₂ and the feeding paths of the _two antennas 11 ₁ and 11 ₂ are individually combined by the difference in the amount of phase shift between 2nπ radians and (2n ± 1) π radians with respect to the integer n, and the first combined feeding is performed. A branching and combining means 21 forming a path and a second combined feed path, 2
Electric field strength for individually receiving the received waves captured by the _two antennas 11 ₁ and 11 ₂ as a vector sum via the first combined feed line and the second combined feed line, and measuring the electric field strength of these vector sums. The electric field strength measured by the electric field strength measuring means 31 is compared with the measuring means 31, and one of the first combined feed path and the second combined feed path which gives a large vector sum is selected. Selection means 3
3 and the branching and combining means 21, which is connected to either the first combined feeding path or the second combined feeding path via the selecting means 33.
It is characterized in that it is provided with a feeding path for the _two antennas 11 ₁ and 11 ₂ and a transmitting / receiving means 35 for transmitting or receiving a radio frequency signal via these antennas.

FIG. 4 is a block diagram showing the principle of the invention described in claim 4. In the invention according to claim 4, two antennas 11 ₁ which are installed or supported by a moving body and are individually matched to a first polarization and a second polarization which are cross polarizations to each other,
11 ₂ and the feeding paths of the _two antennas 11 ₁ and 11 ₂ are individually combined by the difference in the amount of phase shift between 2nπ radians and (2n ± 1) π radians with respect to the integer n, and the first combined feeding is performed. Branching and combining means 21 forming a path and a second combined feeding path, inclination angle measuring means 41 for measuring the inclination angles of the _two antennas 11 ₁ and 11 ₂ according to the movement of the moving body, and inclination angle measuring means. Four
The tilt angle measured by 1 and the tilt angle 2
The magnitude relationship between the two antennas 11 ₁ and 11 ₂ and a threshold value set to a value at which the degree of polarization matching is equal is monitored, and the first combined feed line and the second combined feed line are monitored according to the magnitude relationship. It is connected to either one of the first combined feed line and the second combined feed line via the selecting unit 43 for selecting either one, and the branch combining unit 21, the two antennas 11 ₁ ,
11 ₂ and a transmitting / receiving means 45 for transmitting or receiving a radio frequency signal via these antennas.

In the wireless terminal device according to the first aspect of the invention, the synthesizing means 17 has two antennas 11 ₁ and 11 _2.
The power feeding paths are combined to form a single power feeding path, and the transmitting / receiving means 19 is connected to the single power feeding path and transmits or receives a radio frequency signal via these antennas. Further, the antennas 11 ₁ and 11 ₂ arrive at these antennas because they are individually installed or supported by the moving body by individually matching the first polarization and the second polarization that are cross polarizations. The polarized wave of the received wave is biased with respect to the first polarized wave and the second polarized wave in accordance with the movement of the mobile body, and the inclination angle indicating the degree of the bias is changed. Furthermore, the antennas 11 ₁ and 11 ₂
When the moving body supported by is a carrier, the polarities of the inclination angles of any of these antennas can be reversed depending on which of the left and right hands is used for the support. Therefore, for example, the electric power of the vector sum of the received waves captured by the antennas 11 ₁ and 11 ₂ in the above-described single feed path increases or decreases according to such an inclination angle. However, the value of the tilt angle in the operational state is the antenna 1
It can be easily discriminated based on the physical inclination states of 1 ₁ and 11 ₂ .

The variable phase shift means 15 is provided under the man-machine interface taken by the man-machine interface means 13 in a manner adapted to the tilted state of the antenna 11 ₁ ,
The phase shift amount of one or both of the power feeding lines of 11 ₂ is varied, and the difference in the phase shift amount of these power feeding lines is set to 2 for an integer n.
Set to either nπ radians or (2n ± 1) π radians.

That is, since the above-mentioned vector sum is obtained as a composite wave under the phase difference in which the reception waves captured by the antennas 11 ₁ and 11 ₂ are emphasized, the reception power is kept high during reception, and the transmission power is kept high. In this case, the gain is kept high under the reversibility of the characteristics of these antennas. In the wireless terminal device according to the invention as set forth in claim 2, the antennas 11 ₁ and 11 ₂ are individually matched to the first polarized wave and the second polarized wave which are cross polarized waves and installed in the moving body. Alternatively, the polarized waves of the received waves arriving at these antennas are deviated from the first polarized wave and the second polarized wave, respectively, according to the movement of the moving body, and the inclination angle indicating the degree of the deviation is fluctuate. Furthermore, when the mobile body on which the antennas 11 ₁ and 11 ₂ are supported is a carrier, the polarity of the inclination angle of any of these antennas depends on whether the supporting hand is the left or right hand. Can be flipped. So, for example,
The power of the vector sum of the received waves captured by the antennas 11 ₁ and 11 ₂ increases or decreases according to such a tilt angle. However, the value of the tilt angle in the operating state can be easily determined based on the physical tilt state of the antennas 11 ₁ and 11 ₂ .

On the other hand, the branch synthesizing means 21 includes the antenna 11
Let ₁ and 11 _{2 be} 2nπ radians for an integer n.
The first combined feed line and the second combined feed line are formed by individually combining with the difference in the amount of phase shift from (2n ± 1) π radians. The selecting means 25 selects one of these combined power feeding paths,
Under the man-machine interface taken by the man-machine interface means 23, one is selected which is adapted to the above-mentioned inclination state. The transmitting / receiving means 27 transmits or receives the radio frequency signal through the branching / combining means 21, the feeding paths of the antennas 11 ₁ and 11 ₂ and these antennas in accordance with the combined feeding path thus selected.

That is, the transmitting / receiving means 27 is given one of the above-mentioned vector sums, which is generated under the phase difference in which the received waves captured by the antennas 11 ₁ and 11 ₂ are emphasized. The received power is kept high and the gain is kept high during transmission under the reversibility of the characteristics of these antennas. In the wireless terminal device according to claim 3 of the invention, similarly to the inventions of claims 1 and 2, the polarized waves of the received waves arriving at the antennas 11 ₁ and 11 ₂ are matched by these antennas. The tilt angle indicating the degree of the deviation deviates from the first and second polarized waves, and the polarity of the tilt angle is inverted, so that the power of the vector sum of these received waves may increase or decrease.

The branch synthesizing means 21 is 2n for an integer n.
Electric field strength measuring means for individually combining the feed lines of the antennas 11 ₁ and 11 ₂ with the difference in the amount of phase shift between π radians and (2n ± 1) π radians to form the first and second combined feed lines. Reference numeral 31 measures in parallel the electric field strength of the vector sum of the above-mentioned received waves obtained individually via these combined feeding paths. The selecting means 33 selects one of the above-mentioned first combined feeding path and the second combined feeding path having a large electric field strength measured in this way, and the transmitting / receiving means 35 selects the selected combined feeding path. , The branching / combining means 21, the feeding paths of the antennas 11 ₁ and 11 ₂ and the radio frequency signals are transmitted or received through these antennas.

That is, the transmitting / receiving means 35 emphasizes the received waves captured by the antennas 11 ₁ and 11 ₂ even in an environment in which the tilt angle changes with the movement of the moving body among the vector sums described above. Since the one constantly generated under the phase difference is given, the antenna gain is automatically kept high without the operation of the man-machine interface means required in the invention of claims 1 and 2. .

In the radio terminal device according to the invention described in claim 4, as in the invention described in claims 1 and 2, the polarized waves of the received waves arriving at the antennas 11 ₁ and 11 ₂ are transmitted by these antennas. The tilt angle indicating the degree of the deviation deviates from the matching first and second polarizations, and the polarity of the tilt angle is reversed, and the power of the vector sum of these received waves may increase or decrease.

The branch synthesizing means 21 has 2n for an integer n.
Inclination angle measuring means for individually combining the feed lines of the antennas 11 ₁ and 11 ₂ to form the first and second combined feed lines by the difference in the amount of phase shift between π radians and (2n ± 1) π radians. Reference numeral 41 measures the tilt angles of the antennas 11 ₁ and 11 ₂ which can fluctuate according to the movement of the moving body. The selecting means 43 monitors the magnitude relationship between the tilt angle measured in this way and a threshold value preset as a value of the tilt angle at which the polarization matching degrees of the antennas 11 ₁ and 11 ₂ are equal, and Either the first combined feeding path or the second combined feeding path described above is selected on the basis of the magnitude relationship, and the transmitting / receiving means 45 is selected by the transmitting / receiving means 45, the branch combining means 21, the antenna 11 ₁ , 11 ₂ feed line and transmits to or receives radio frequency signals via these antennas.

That is, the transmitting / receiving means 45 emphasizes the received waves captured by the antennas 11 ₁ and 11 ₂ among the vector sums described above, even in an environment in which the tilt angle changes with the movement of the moving body. Since the one constantly generated under the phase difference is given, the antenna gain is automatically kept high without the operation of the man-machine interface means required in the invention of claims 1 and 2. .

[0023]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 5 shows claim 1,
It is a figure which shows embodiment corresponding to invention of 2 and 4. In the figure, the antenna terminal of the transmission / reception unit 51 including an antenna duplexer (not shown) at the final stage is connected to the shared terminal of the power distribution combiner 52, and the power distribution combiner 5
The first branch terminal 2 is connected to the feeding end of the antenna 53 ₁ . Second branch terminal of the power distributor combiner 52 is connected to the feed end of the antenna 53 ₂ through the variable phase shifter 54, the control input of the variable phase shifter 54 of the output of the non-contact encoder 55, the uppermost Connected to the output corresponding to the bit.

FIG. 6 is a diagram showing the structure of the variable phase shifter. In the figure, a strip line 61 having a substantially “U” shape is formed between the second branch terminal of the power distributor / combiner 52 and the feeding end of the antenna 53 ₁ , and among the both ends of the strip line, The vicinity of one end corresponding to the connection point with the power distribution / combiner 52 is connected to a constant current source (not shown) via an inductor 62. In addition, the vicinity of the other end of the strip line 61 is grounded via the resistor 63, and among the sections sandwiched by both ends of the strip line 61, a section bent in a U-shape (hereinafter, referred to as a “stub”). ".)
A pin diode 64 biased in the forward direction via the inductor 62 and the resistor 63 described above is arranged at both ends of the pin.

Regarding the correspondence between this embodiment and the block diagrams shown in FIGS. 1 and 2, the antenna 53 ₁ ,
53 ₂ corresponds to the antennas 11 ₁ and 11 ₂ , the non-contact encoder 55 corresponds to the man-machine interface means 13 and 23, the variable phase shifter 54 corresponds to the variable phase shift means 15,
The power distribution combiner 52 corresponds to the combiner 17, the transmitter / receiver 51 corresponds to the transmitter / receiver 19, 27, and the variable phase shifter 54.
The power distribution combiner 52 corresponds to the branch combiner 21 and the selector 25.

FIG. 7 is a diagram (1) showing a mode of the antenna and a portable telephone according to the present embodiment. FIG. 8 is a diagram for explaining the operation of this embodiment.

The operation of the present embodiment corresponding to the inventions of claims 1 and 2 will be described below with reference to FIGS. As shown in FIGS. 7 (a) and 7 (b), the antenna 53 ₁ is a whip antenna that efficiently captures the vertically polarized reception wave, and the antenna 53 ₂ is, on the contrary, efficiently the horizontally polarized reception wave. It is composed of a dipole antenna or a printed dipole antenna (both are mounted in the housing of the terminal device).

Since the characteristics of the antennas 53 ₁ and 53 ₂ and the transmission characteristics of the wireless transmission path formed through these antennas are generally bidirectionally reversible, in the following, these antennas will be referred to for simplicity. Attention will be paid to the process in which the incoming reception wave is given to the reception input of the transmission / reception unit 51. The contactless encoder 55 is manually set in advance in accordance with the physical inclination angle of the terminal device during operation, and the output corresponding to the setting is such that the control input of the variable phase shifter 54 is grounded or unpowered and ungrounded. Set to the state of.

In the variable phase shifter 54, both ends of the stub are short-circuited or opened via the pin diode 64 by interrupting the current supplied from the constant current source according to the state of such control input. Note that the inductor 62 forms such a current supply path and provides isolation between the strip line 61 and the above-described low current source in the radio frequency region. Further, since the line length of such a stub is preset to a half wavelength of the received wave, the phase shift amount Δ of the variable phase shifter 54 depends on two states set via the non-contact encoder 55. Increase or decrease by π radians.

On the other hand, the antennas 53 ₁ and 53 ₂ have the maximum gains for the vertically polarized received wave and the horizontally polarized received wave, respectively. However, the terminal device is operated with the elements of these antennas inclined with respect to the vertical direction and the horizontal direction, respectively. Therefore, the antennas 53 ₁ , 5
Received wave powers R1 and R actually captured by 3 ₂
As shown in FIG. 8, reference numeral 2 denotes the electric power R of the received wave arriving at these antennas, the inclination angle θ thereof, and the antenna 53.
The relative gain g of the antenna 53 ₂ with respect to ₁ is given by Rcos θ and gRsin θ, respectively.

Further, the amount of phase shift occurring in the variable phase shifter 54 in the section other than the stub described above is so small that it can be ignored, and the feeding ends of the antennas 53 ₁ and 53 ₂ and each branch terminal of the power distribution / combiner 52 are connected. If it can be considered that the amount of phase shift individually generated between and is similarly small or the same,
The level r of the vector sum of the received waves captured by these antennas may be larger than the power R of the received waves depending on the setting of the contactless encoder 55 (FIG. 8).
It becomes a small value (Fig. 8).

The total gain G of the antennas 53 ₁ and 53 ₂ for obtaining such a Bertdle sum of the level r is, for example, T. Taga a
nd K. Tsunekasa "Performance Analysis of a Built-In
PlanarInverted F Antenna for 800MHz Band Portable
Radio Units "IEEE JOURNALONSELECTED AREAS IN COMMU
NICATIONS. VOL. SAC-5, NO.5, pp921-929 (1987), "Relationship between gain in multiple waves and housing length of small radio antenna," IEICE Transactions, B-2 vol J75- B-II No.10, pp705
-707 (1992)), the gain of vertical polarization components of these antennas in the horizontal plane ( = Gθ (π / 2, φ)), gain of horizontal polarization component (= Gφ (π / 2, φ)), cross polarization coupling degree (= 1 / C _V ),

[Equation 1] The cross polarization coupling degree 1 / C is given as an example.
_{When V} is a general value in urban areas (= 6 decibels), a single vertically polarized antenna is used as shown by the dotted line in FIG. 12 (shown by the solid line in the figure). ), The decrease in gain is suppressed.

Therefore, in this embodiment, by properly setting the contactless encoder 55 in advance as described above, the polarization of the incoming received wave is different from the polarization in which the gains of these antennas are maximum. A decrease in reception sensitivity due to arrival of waves is suppressed.

Although the variable phase shifter 54 is arranged at the feeding end of the antenna 53 _{2 in} the above-described embodiment, the present invention is not limited to such a configuration. For example, the variable phase shifter 54 is It may be arranged at the feeding end of the antenna 53 ₁ ,
The antennas 53 ₁ and 53 ₂ may be arranged at both power feeding ends. In addition, in the above-described embodiment, the power distribution combiner 52
There is no description about the configuration of, but for example,
The Wilkinson circuit shown in FIG. 9 (a) and the hybrid ring circuit shown in FIG. 9 (b) can be applied.

Further, the power dividing / combining unit 52 and the variable phase shifter 54 can be replaced by a rat race circuit 71 and a selecting unit 72 which will be described later. Further, in the above-described embodiment, the whip antenna is applied as the antenna 53 _1. However, the configuration is not limited to such a configuration, and for example, a printed dipole antenna can be applied as shown in FIG.

FIG. 11 is a diagram showing an embodiment corresponding to the invention described in claims 3 and 4. In the drawing, components having the same functions and configurations as those shown in FIG. 5 are denoted by the same reference numerals, and description thereof is omitted here. The first terminal of the rat race circuit 71 is connected to the feeding end of the antenna 53 ₁ , and the second terminal of the rat race circuit is connected to the first input of the selecting section 72 and one electric field measuring input of the receiving section 73. To be done. The third output of the rat race circuit 71 is connected to the feeding end of the antenna 53 ₂ , and the fourth output of the rat race circuit is connected to the second input of the selector 72 and the other electric field measurement input of the receiver 73. To be done. The output of the selection unit 72 is connected to the reception input of the reception unit 73, and a demodulation output is obtained at its output. The first and second electric field measurement outputs of the receiver 73 are connected to the corresponding inputs of the controller 74, and the outputs thereof are connected to the selection inputs of the selector 72.

Regarding the correspondence relationship between this embodiment and the block diagram shown in FIG. 3, the antennas 53 ₁ and 53 ₂ correspond to the antennas 11 ₁ and 11 ₂ , and the rat race circuit 71 corresponds to the branch synthesizing means 21. The receiving unit 73 corresponds to the electric field strength measuring unit 31 and the transmitting / receiving unit 35, and the control unit 74 and the selecting unit 72 correspond to the selecting unit 33. Hereinafter, the operation of the present embodiment will be described.

The length of the annular circuit from the first terminal of the rat race circuit 71 to the first terminal through the second terminal, the third terminal and the fourth terminal forms the rat race circuit. Depending on the characteristics and dimensions of the material to be used, the wavelengths of the received waves arriving at the antennas 53 ₁ and 53 ₂ are set to 3/4 wavelength, 1/4 wavelength, 1/4 wavelength, and 1/4 wavelength, respectively. It

Therefore, the received waves captured by the antennas 53 ₁ and 53 ₂ are given to the fourth terminal of the rat race circuit 71 as a combined wave (FIG. 8 ()) having the same phase, and the rat race circuit 71 At the second terminal, these received waves are combined waves with a phase difference of π radians (Fig. 8).
()) Is given. The receiving unit 73 measures the electric field strengths of these combined waves, and the control unit 74 generates a selection signal indicating the larger electric field strength among the electric field strengths obtained by the measurement. Based on the selection signal generated in this way, the selection unit 72 selects one of the combined waves obtained at the second and fourth terminals of the rat race circuit 71 that has a high electric field strength. The receiving unit 73 obtains a demodulation output by taking in and demodulating the composite wave selected in this way.

As described above, according to this embodiment, the antenna 5
Of the combined waves of in-phase and anti-phase of the received wave detected by 3 ₁ and 53 ₂ , the _one with a large electric field strength is automatically selected and is the target of the demodulation process, so the gain of the antenna system is automatically And it is surely maintained at a high value. Hereinafter, an embodiment corresponding to the invention described in claim 4 will be described with reference to FIG.

The difference between the present embodiment and the embodiment corresponding to the invention described in claim 3 is that the angle sensor 56 is constructed by attaching a disk, whose center of gravity is eccentric, to a contactless encoder (not shown). The determination unit 57 subordinately connected to the angle sensor is provided in place of the control unit 74, and a predetermined threshold value is given to the threshold value input of the determination unit 57.

Regarding the correspondence relationship between this embodiment and the block diagram shown in FIG. 4, the antennas 53 ₁ and 53 ₂ correspond to the antennas 11 ₁ and 11 ₂ , and the rat race circuit 71 corresponds to the branch synthesizing means 21. The angle sensor 56 corresponds to the tilt angle measuring means 41, the determining section 57 and the selecting section 72 correspond to the selecting means 43, and the receiving section 73 corresponds to the transmitting / receiving means 45.

The operation of this embodiment will be described below. In the angle sensor 56, the disks described above are antennas 53 ₁ and 53 _2.
Is operated in a tilted state, the built-in encoder is rotationally driven over an angle equal to the angle of the tilt,
A digital signal or an analog signal indicating such an angle is generated through the encoder.

The judging section 57 judges the magnitude relationship between the angle indicated by such a signal and a predetermined threshold value, and grounds the control input of the variable phase shifter 54 according to the magnitude relationship.
Alternatively, it is set to a state of no power feeding and no grounding. Therefore,
According to this embodiment, the operator drastically changes the tilt angle of the terminal device by appropriately setting in advance the corresponding relationship between the magnitude relationship and the two states that should be given to the selection input of the selection unit 72. The total gain of the antenna system from the power feeding ends of the antennas 53 ₁ and 53 ₂ to the input end of the receiving unit 73 is automatically maintained at a high value even when the user performs the operation of holding or switching to the opposite hand.

In the above-described embodiment, the angle sensor 56 and the determination unit 57 are provided instead of the control unit 74 included in the embodiment corresponding to the invention described in claim 3. The configuration is not limited, and for example, as shown by adding dotted lines and reference numerals “56” and “57” in FIG. 5, the contactless encoder 55 included in the embodiments corresponding to the inventions of claims 1 and 2. Instead of this, it is also possible to configure by including the angle sensor 56 and the determination unit 57.

Further, in each of the above-described embodiments, the antennas 53 ₁ and 53 ₂ are respectively matched with the vertically polarized waves and the horizontally polarized waves, but the present invention is not limited to such a combination of polarized waves. For example, as long as there are two polarizations that are cross polarizations such as a combination of right-handed polarization and left-handed polarization, these antennas may match any combination of polarizations.

[0047]

As described above, the first and second aspects are provided.
In the invention described in the paragraph 1, under the manual setting adapted to the physical inclination state of the two antennas which are individually matched to the two polarized waves which are cross-polarized with each other, the feed lines of these antennas have an appropriate phase shift. Combined in a combination of quantities, the gain of the antenna system is kept at a high value.

Further, in the inventions according to claims 3 and 4, the feeding paths of the two antennas which are individually matched to the two polarized waves which are cross polarized waves are appropriate without performing the above-mentioned manual setting. The gain of the antenna system is automatically maintained at a high value by combining with various combinations of phase shift amounts. Therefore, in the wireless terminal device and other wireless devices to which these inventions are applied, the wireless terminal can flexibly adapt to the movement of the moving body and the installation form of the antenna, the transmission quality of the wireless transmission path is maintained high, and the reliability and performance are improved. Is increased.

[Brief description of drawings]

FIG. 1 is a principle block diagram of the invention according to claim 1;

FIG. 2 is a principle block diagram of the invention according to claim 2;

FIG. 3 is a principle block diagram of the invention according to claim 3;

FIG. 4 is a principle block diagram of the invention according to claim 4;

FIG. 5 is a diagram showing an embodiment corresponding to the invention described in claims 1, 2, and 4.

FIG. 6 is a diagram showing a configuration of a variable phase shifter.

FIG. 7 is a diagram (1) showing an aspect and an embodiment of an antenna in the present embodiment.

FIG. 8 is a diagram for explaining the operation of this embodiment.

FIG. 9 is a diagram showing a configuration example of a power distribution combiner.

FIG. 10 is a diagram (2) showing the aspect of the antenna and the embodiment in the present embodiment.

FIG. 11 is a diagram showing an embodiment corresponding to the invention described in claims 3 and 4.

FIG. 12 is a diagram showing the relationship between the tilt angle and the antenna gain.

[Explanation of symbols]

 11, 53 antennas 13, 23 man-machine interface means 15 variable phase shift means 17 combining means 19, 27, 35, 45 transmitting / receiving means 21 branch combining means 25, 33, 43 selecting means 31 electric field intensity measuring means 41 inclination angle measuring means 51 Transmitter / receiver 52 Power divider / combiner 54 Variable phase shifter 55 Non-contact encoder 56 Angle sensor 57 Judgment unit 61 Strip line 62 Inductor 63 Resistor 64 pin diode 71 Rat race circuit 72 Selector 73 Receiver 74 Control unit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiroyuki Seki, Inventor Hiroyuki Seki 1015, Kamiodanaka, Nakahara-ku, Kawasaki, Kanagawa Prefecture, Fujitsu Limited (72) Inventor, Ken Toda, 1015, Kamedotachu, Nakahara-ku, Kawasaki, Kanagawa Prefecture, Fujitsu Limited

Claims (4)

[Claims] 1. Two antennas installed or supported on a mobile body and individually matched with a first polarized wave and a second polarized wave, which are cross polarized waves, and a feed line of the two antennas. , A man-machine interface means for taking a man-machine interface relating to the setting of the difference in the amount of phase shift, and one or both of the feeding paths of the two antennas, and the man-machine interface means is provided. Depending on the setting, a variable phase shift means for setting the difference in the amount of phase shift to 2nπ radians or (2n ± 1) π radians with respect to an integer n, and a single power feed by combining the two antenna feed lines. A synthesizing means forming a path and a single feeding path formed by the synthesizing means and transmitting a radio frequency signal through the feeding paths of the two antennas and these antennas. A wireless terminal device comprising a transmitting / receiving means for receiving or receiving. 2. An antenna installed or supported by a mobile body and individually matched with a first polarized wave and a second polarized wave, which are cross polarized waves, and a feeding path of the two antennas. Branching and combining means for individually combining with the difference in the amount of phase shift between 2nπ radians and (2n ± 1) π radians with respect to the integer n, and forming a first combined feed line and a second combined feed line, respectively. A man-machine interface means for taking a man-machine interface relating to selection of one of the first combined feed line and the second combined feed line; and the first combined feed line and the second combined feed line. Within the road,
Selection means for selecting one of them under a man-machine interface that the man-machine interface means takes, and connection to either the first combined feeding path or the second combined feeding path via the selecting means. And a transmitter / receiver for transmitting or receiving a radio frequency signal via the antennas and the feeding paths of the two antennas and these antennas. 3. Two antennas installed or supported by a mobile body and individually matched with a first polarized wave and a second polarized wave, which are cross-polarized waves, and a feeding path for the two antennas. Branching and combining means for individually combining with the difference in the amount of phase shift between 2nπ radians and (2n ± 1) π radians with respect to the integer n, and forming a first combined feed line and a second combined feed line, respectively. An electric field strength that individually receives the received waves captured by the two antennas as a vector sum via the first combined feed path and the second combined feed path, and measures the electric field strength of these vector sums. The electric field strength measured by the electric field strength measuring means is compared with the measuring means, and one of the first combined feeding path and the second combined feeding path, which gives a large vector sum, is selected. Selecting means, and the selecting hand Is connected to either the first combined feed line or the second combined feed line via a stage, and a radio frequency signal is transmitted via the branch combining means, the feed lines of the two antennas, and these antennas. A wireless terminal device, comprising: a transmitting / receiving unit for receiving or receiving. 4. Two antennas installed or supported on a mobile body and individually matched with a first polarized wave and a second polarized wave, which are cross polarized waves, and a feed line for the two antennas. Branching and combining means for individually combining with the difference in the amount of phase shift between 2nπ radians and (2n ± 1) π radians with respect to the integer n, and forming a first combined feed line and a second combined feed line, respectively. An inclination angle measuring means for measuring an inclination angle of the two antennas according to the movement of the moving body; an inclination angle measured by the inclination angle measuring means; and a polarization matching of the two antennas with respect to the inclination angle. And a selection unit that monitors a magnitude relationship with a threshold value set to a value at which the degrees are equal, and selects either one of the first combined feed path and the second combined feed path according to the magnitude relationship. , The first combined feed line and the second via the selection means. Connected to any one of the combined feeding paths of the above, and provided with the branch combining means, the feeding paths of the two antennas, and a transmitting / receiving means for transmitting or receiving a radio frequency signal via these antennas. Wireless terminal device.