JPH0294713A - Portable radio equipment - Google Patents

Abstract

PURPOSE:To prevent the deterioration in the gain of an antenna, to improve the speech quality and to expand the speech distance by switching a polarized wave from the antenna by 90 deg. automatically. CONSTITUTION:If an electric field strength detection signal 21 is below a prescribed value, the way of placing a portable radio equipment is judged to be changed resulting in the fact of a rotated polarized wave and a switch 15 different from a switch 14 turned on at present is to be turned on. Moreover, in this case, if the electric field strength detection signal 21 does not exceed the prescribed value even with the switch changed over, the state of the switches is restored before the changeover and the said state is kept for only a proper time.

Description

[Detailed description of the invention] [Industrial application field] TECHNICAL FIELD The present invention relates to a portable wireless device.

In particular, it relates to a portable wireless device that has the ability to automatically switch polarization.

[Prior Art] Conventionally, portable wireless devices have been used in some cases, depending on the usage situation, such as being used vertically, lying on its side, or being held diagonally.

For example, a portable radio as shown in FIG. 2 is used to hold a handset 1 and make calls, and the radio main body 2 may be used with the Z axis shown in the figure facing vertically. However, if the main body 2 is used in an uncomfortable place, the main body 2 may fall on its side and its Y axis may face vertically.

Furthermore, a portable radio as shown in Fig. 3 is used by holding the main body 3 directly in the hand and placing the receiver of the operating section 4 against the ear, and in the A conversation state, it is used tilted. However, when the stand-by is sometimes placed on a desk or the like, it is sometimes used with the main body 3 standing upright and its Z-axis oriented vertically. When the device is placed on its side and is placed on standby while moving, it is often placed on its side so that the X-axis or Y-axis becomes vertical.

The antennas 2a and 3a of such a portable radio device are fixed to the main body of the portable radio device, and are generally linearly polarized antennas.

[Problems to be Solved] The conventional portable drones described above have linearly polarized antennas and are fixed to the main body. The polarization of the antenna will also change accordingly.

Therefore, the gain of the antenna may deteriorate due to the polarization of the antenna not matching that of the other station with which communication is being conducted. Gain is most degraded when the polarizations of the antennas are orthogonal to each other, and the degree of gain degradation is particularly large in suburban areas where cross-polarized waves are less likely to occur due to the influence of buildings.

In this way, with conventional portable radios, the gain of the antenna changes greatly depending on how it is used (how it is placed, the angle at which it is held), and even in the same location, the call quality deteriorates significantly, or it becomes impossible to make a call. However, there were some problems.

The present invention has been made in view of the problems mentioned above.
[1] To provide a portable wireless device whose call quality does not deteriorate significantly even if the placement or holding angle changes.

[Means for Solving the Problems] In order to achieve the above object, the portable radio device of the present invention includes a rectangular radiating conductor plate arranged parallel to the casing of the radio device at a predetermined interval, and the radiating conductor plate the first adjacent to each other
and a shorting conductor connecting the vicinity of the intersection of the second sides to the casing, and a shorting conductor located at a predetermined distance along the second side from the shorting conductor, and one end of the shorting conductor. was connected to the housing, and the other end was connected to the radiation conductor plate: JS
an antenna consisting of a second switch, and a feeding point placed a predetermined distance away from the shorting conductor in the vicinity of a diagonal line on the radiation conductor plate passing through the intersection where the shorting conductor is placed; A transmitter and a receiver are connected to the feeding point via a duplexer, and the signal is output from the receiver. Switch control for inputting a received electric field detection signal corresponding to the strength of the received electric field and outputting a control signal for controlling ON10F of the first and second switches according to the value of the received electric field detection signal. It has a configuration including a section.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings.

The first Iffl (a) is a perspective view showing the casing and antenna portion of the portable wireless device, and the same figure (b) is a block diagram.

In these figures, 11 is a housing of the radio.

Reference numeral 12 denotes a rectangular radiation conductor plate, which is arranged parallel to the housing 11 at a predetermined interval.

A short-circuit conductor 13 connects the vicinity of the intersection 12c of the first and second sides 12a and 12b adjacent to each other of the radiation conductor plate 12 to the housing 11.

14 is a first switch, 15 is a second switch,
from the shorting conductor 13 to the first and second sides 12, respectively.
a, 12b at a predetermined distance apart, one end 14a, 15a to the ifj inscription 11, the other gt
ab and 15b are connected to the radiation conductor plate 12.

Reference numeral 16 denotes a feeding point, which is arranged at a position a predetermined distance away from the short-circuiting conductor 13 near the diagonal line 17 on the radiation conductor plate 12 passing through the intersection 12c where the short-circuiting conductor 13 described in 1vi is arranged.

Such a portable mm antenna has a first switch 1
4 is turned on (shorted), the electric field becomes sensitive to polarized waves parallel to the Z axis, and the second switch 15 is turned on.
(short circuit), the electric field becomes sensitive to polarized waves parallel to the Y axis. That is, the first and second switches 1
By cutting 4°15, the polarization is cut by 90°.

Further, since the feed point 6 is provided near the diagonal line 17 of the radiation conductor plate 12, a good matching state can be maintained without changing the feed point even if the polarization is switched.

Furthermore, in the antenna of this embodiment, one side of the radiation conductor plate 12 is about 1/4 to 1/8 in, making it a small antenna.

In FIG. 1(b), 18 is an antenna duplexer,
The input of the receiving section (RX) 19 and the transmitting section (TX) are connected to the feeding point 16 of the antenna through this antenna duplexer 18.
20 outputs are connected. The receiving section 19 is adapted to output a received electric field detection signal 21 according to the strength of the received electric field.

22 is a switch control section that monitors the value of the received electric field detection signal 21 from the receiving section 19 and switches the first
and outputs a control signal 23°24 for controlling ON10FF of the second switch 14°15. in particular,
If the field strength detection signal 21 falls below a predetermined value, it is determined that the position of the portable radio has changed and the polarization has rotated,
A switch (15 or 14) different from the switch (14 or 15) that is currently turned on is turned on. At this time, if the field strength detection signal 21 does not exceed a predetermined value even after switching the switch, the switch is returned to the state before switching, and the switch state is maintained for an appropriate period of time.

This prevents switching malfunctions, such as when the portable wireless device is located at the trough of the spatial standing wave.

In the portable radio device described above, even if the antenna polarization rotates due to changes in the placement or holding angle of the housing 11, the antenna gain can be prevented from significantly deteriorating by automatically switching the polarization by 90 degrees. It can be prevented.

Further, in the antenna, one side of the radiation conductor plate 12 is approximately 1/4 to
Since it is a small antenna of about 1/8λ, it is possible to downsize the portable radio device itself.

[Effects of the Invention] As explained above, the present invention automatically switches the polarization of the antenna by 90°vJ, so it is possible to prevent antenna gain deterioration depending on the usage pattern, and improve call quality. This has the effect of increasing the communication distance.

[Brief explanation of the drawing]

FIG. 1(a) is a perspective view showing the housing and antenna portion of a portable radio, FIG. 1(b) is a block diagram, FIG. 2 is a perspective view of a conventional portable radio, and FIG. FIG. 2 is a perspective view of a conventional hand belt type wireless device. 11: Radio case. 12: Radiation conductor plate 13: Short-circuit conductor 14: First switch 15: Second switch: Feeding point two diagonals: Transmitting/receiving duplexer: Receiving section: Transmitting section x IT field strength detection signal: Switch control circuit: First Switch control signal: second switch control signal

Claims (1)

[Claims] A rectangular radiating conductor plate arranged parallel to the casing of the radio at a predetermined interval, and the vicinity of the intersection of adjacent first and second sides of the radiating conductor plate are connected to the casing. a shorting conductor, and a first and second conductor arranged at a predetermined distance apart from the shorting conductor along the first and second sides, and having one end connected to the housing and the other end connected to the radiation conductor plate. an antenna comprising a second switch, a feeding point placed a predetermined distance away from the shorting conductor in the vicinity of a diagonal line on a radiation conductor plate passing through the intersection where the shorting conductor is placed; A transmitting section and a receiving section connected to the transmitting/receiving unit via a duplexer, and output from this receiving section,
a switch control unit that inputs a received electric field detection signal corresponding to the strength of the received electric field and outputs a control signal for controlling ON/OFF of the first and second switches according to the value of the received electric field detection signal; A portable radio device characterized by being equipped with.