JPS6124334A - Radio communication equipment - Google Patents

Abstract

PURPOSE:To prevent deterioration in communication quality attended with a voltage standing wave ratio of an antenna by connecting at least one of circulator terminals to a transmission and reception section of a radio communication equipment and connecting remaining terminals of the circulator to each of plural antenna elements. CONSTITUTION:The power supplied from a transmitter 3 is radiated normally from the 1st antenna element 11. If the VSWR of the 1st antenna element 11 is deteriorated extremely, most of the power applied to the 1st antenna element 11 is reflected and most of the power fed from a transmitter 3 is radiated from the 2nd antenna element 12. On the other hand, when the major radiation is conducted from the 1st antenna element 11, even if the VSWR of the 2nd antenna element 12 is deteriorated, the 1st antenna element 11 is immune to the effect. For example, when the radio communication equipment is of the simplex system, the connection between the circulator 13 and the transmitter/receiver 3, 15 has only to be connected via a transmission/reception switch 14.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a wireless communication device provided with a plurality of antenna elements and a circulator having more terminals than the number of antenna elements.

[Prior Art] An example of a transmission system in a conventional wireless communication device is shown in FIG. ) is connected to the transmitter 3 via two wires,
If there is a mismatch in the antenna 1, the transmitter 3 is constructed so that it is not affected by the impedance of the antenna 1 by consuming the reflected wave with a resistor (not shown) attached to the isolator 2. There is.

For this reason, in the unlikely event that the mud pressure standing wave ratio (SW 几) of antenna 1
The transmitter 3 can continue to operate stably even if the condition is extremely deteriorated.

The phenomenon in which the vswa of the antenna is extremely deteriorated is as follows.
This is often seen in portable radio communication devices where the installation environment of the antenna cannot be kept constant. For example, in a portable wireless device that uses a built-in antenna that is highly portable, the user may end up holding the antenna part with his/her hand.

In this way, even in wireless communication devices where the installation environment of the antenna cannot be kept constant, the transmission system has conventionally been configured as shown in Figure 1, so if the antenna's V8WR deteriorates, the transmission Although the stability of the operation of Unit 3 could be ensured, there was a drawback in that the quality of communication deteriorated due to the decrease in radiated power, and the phenomenon that communication became impossible was observed.

As a means to reduce the decrease in transmit power and receive gravity when the VSWR of the antenna deteriorates, as shown in Figure 2, the reflected power of the antenna is monitored and the reflected power exceeds the standard value. A device that switches antennas when the weather is affected is conceivable.

In FIG. 2, the same reference numerals as in FIG. 1 indicate corresponding parts, 4 and 5 are the first and second antennas, 6
a*6b is a directional coupler that separates propagating waves according to direction, 7a and 7b are directional couplers (la reb
8 is a switch control circuit which inputs the outputs of the reflected power detection circuits 7a+7b, monitors the outputs, and switches the antenna changeover switch 9.

The transmitter 3 connects the first and second antennas 4 and 5 via the isolator 2 and the antenna changeover switch 9 in series.
are connected to each.

However, a wireless communication device having such a configuration has the disadvantage that the configuration is complicated and uneconomical.

On the other hand, in the receiving system, the VSW of such an antenna
As the reception power decreases due to the deterioration of R, quality deterioration or communication failure may occur during communication, but such problems can be avoided by using methods such as diversity receivers that use multiple antennas. can be improved.

[Object and structure of the invention]

In view of the above points, the present invention has been made to solve such problems and eliminate such drawbacks.The purpose of the present invention is to maintain a constant transmission output with a simple configuration, and to reduce the influence of the surrounding environment. It is an object of the present invention to provide a wireless communication device that can reduce deterioration in communication quality due to V8WR deterioration of an antenna due to deterioration of V8WR of an antenna, and can also reduce deterioration of communication quality due to a decrease in reception power due to deterioration of VSWR of an antenna.

In order to achieve such an object, the present invention combines two or more antenna elements and a circulator having as many terminals as the number of antenna elements, and connects at least one of the terminals of the circulator to wireless communication. It is connected to the transmitter/receiver section of the device, and the terminals of the remaining circulators are connected to each of the plurality of antenna elements.

〔Example〕

Embodiments of the present invention will be described in detail below based on the drawings.

In addition, in the following explanation, in order to simplify the explanation,
An example will be explained in which there are two antenna elements.

FIG. 3 is a block diagram for explaining the principle of the wireless communication device according to the present invention.

In FIG. 3, the same reference numerals as in FIG. 1 indicate corresponding parts, 11 and 12 are first antenna elements installed at an appropriate predetermined distance, 13 and 2 are antenna elements, This first and #2 antenna element 11.1
2 is connected to a circulator 13 that circulates in the direction of the arrow. Here, the distance between the antenna elements 11 and 12 of the edges 1 and 2 is selected with consideration given to preventing these two antennas from being affected by Ji'U [+ at the same time. And circulator 13
A transmitter 3 is connected to the remaining terminals via an isolator 2. Note that this isolator 2 is mainly used to stabilize the operation of the transmitter 3 in consideration of the case where the VSWR of both antennas deteriorates at the same time.

Next, the operation of the apparatus shown in FIG. 3 will be explained.

First, power supplied from the transmitter 3 is normally radiated from the first antenna element 11. However, if the vswB of the first antenna element 11 deteriorates extremely, most of the power supplied to the first antenna element 11 will be reflected, and most of the power supplied from the transmitter 3 will be reflected to the second antenna element 11. is radiated from the antenna element 12 of.

On the other hand, when radiation is mainly performed from the first antenna element 11, even if the VSWR of the second antenna element 12 deteriorates, the first antenna element 11 is not affected.

In this way, in the present invention, when the VSWR of the antenna contributing to radiation deteriorates, radiation is performed from another antenna with good vswg, and the radiation power is automatically kept constant.

The device shown in FIG. 3 can be applied as is to a wireless communication device that has an antenna dedicated to transmission, but in many cases, in ordinary wireless communication devices, one antenna is used for both transmission and reception. Therefore, an example of application to a wireless communication device in which the antenna element is used for both transmission and reception will be shown and explained below.

FIG. 4 is a block diagram showing an embodiment of a wireless communication device according to the present invention, and shows a case where the present invention is applied to a simplex wireless communication device.

In FIG. 4, parts that are the same as those in FIG. 3 are given the same reference numerals and explanations will be omitted. In the figure, 14 is a 14-Fi transmit/receive switch, and 15 is a receiver. If the wireless communication device is of the simplex type, the circulator 13 and the transceivers 3, 15 may be connected via a transmit/receive switch 14, as shown in FIG.

FIG. 5 is a block diagram showing another embodiment of the present invention, and shows an example of the case where the present invention is applied to a duplex wireless communication device.

In FIG. 5, the same reference numerals as in FIG. 4 indicate corresponding parts, and 16 is an antenna duplexer.

Here, the difference from FIG. 4 is that an antenna duplexer 16 is used instead of the transmit/receive switch 14 in FIG. The reason is that I tried to connect it.

In FIGS. 4 and 5, when the vSVfBJ of the second antenna element 12 deteriorates, the first antenna element 11 performs transmission and reception, and the VSWR of the first antenna element 11 deteriorates. Sometimes, the second antenna element 12 performs transmission and reception.

In each of the embodiments shown in FIGS. 4 and 5, if the VSWRs of both the first and second antenna elements 11 and 12 are good, transmission is performed using the first antenna element 1.
1, and reception is performed by the second antenna element 12.

FIG. 6 is a block diagram showing still another embodiment of the present invention,
This shows another example in which the present invention is applied to a duplex wireless communication device.

In FIG. 6, the same parts as in FIG. 5 are given the same reference numerals, and their explanation will be omitted. In the figure, 17 and 1817
J: first and second antenna duplexers, the first antenna duplexer 17 is connected to the first antenna element 11, and the second antenna duplexer 18 is connected to the second antenna element 12.
It is connected to the. Each transmission input terminal 17-1.18 of this first and second antenna duplexer 17.18
-1 are each connected to the circulator 13, and each reception output terminal 17-2, 18-2 is connected to the receiver 15, respectively.

In the device configured in this manner, the transmitted gravity from the transmitter 3 enters the circulator 13 via the isolator 2, and this circulator 13 circulates in the direction of the arrow, and is connected to the first and second antenna duplexers 17, respectively. .18
V8'vVR of the first and second antenna elements 11.12 is radiated from either one of the antenna elements through the V8'vVR. On the other hand, the first and second antenna elements 1
The radio waves captured by either antenna with a good VSWR of 1.12 are transmitted to the receiver 15 through an antenna duplexer connected to the antenna with a good VSWR.

Since the embodiment shown in FIG. 6 has two receiving output systems, it can be applied to a device that performs diversity reception.

FIG. 7 is an explanatory diagram showing an example of mounting the antenna of a portable wireless device to which the present invention is applied, and shows an example of the mounting position of the antenna when the present invention is applied to a portable wireless device using a built-in antenna. It is.

In FIG. 7, numeral 19 indicates a transmitting section, and numeral 20 indicates a receiving section. 21 is a first built-in antenna mounting part, 22 is a portable radio device housing, and 23 is a first built-in antenna mounting part;
is the second built-in antenna mounting section. In FIG. 7, a first antenna and a second antenna are respectively arranged in antenna mounting portions 21 and 23, which are hatched portions on the upper and lower sides of the back surface of the portable radio device 1 and the second body 22.

When the portable radio device is held by hand, the user grasps either the bottom, center, or top of the portable radio device housing 22, so that at least one antenna has good VSWR.

For this reason, deterioration in speech quality due to the holding method can be extremely reduced.

〔Effect of the invention〕

As explained above, according to the present invention, by using complicated means, two or more antenna elements and a circulator are combined, and the power output from the transmitter is adjusted to VSWR.
By using a simple configuration in which the power is supplied to any one antenna element with good quality, the transmission output can be kept constant, and the VSW of the antenna due to the influence of the surrounding environment can be maintained. , it is possible to reduce deterioration in communication quality due to deterioration, and it is also possible to reduce deterioration in communication quality due to a decrease in reception power due to deterioration of vswn of the antenna, so the practical effect is extremely large.

Furthermore, according to the present invention, unlike the conventional method of detecting the reflection box force and switching the antenna, there is no need for a detection circuit, a switch circuit, or a control circuit, and it is possible to combine an antenna element of 2'" or more and a circulator. Since the desired purpose can be achieved by doing so, the configuration is simple and easy, and the cost is reduced due to the simplification of the configuration, making it extremely effective in terms of being economical.

[Brief explanation of the drawing]

1 and 2 are block diagrams showing an example of a conventional wireless communication device, FIG. 3 is a block diagram for explaining the principle of the present invention, and FIG. 4 is a block diagram showing an example of a wireless communication device according to the present invention. The block diagrams, Figs. 5 and 6 are block diagrams showing other embodiments of the present invention, and Fig. 7 is an explanatory diagram showing an example of mounting an antenna on a portable radio device to which the present invention is applied. 3...-〇Transmitter, 11,120-...Antenna element,
13@・e・circulator, 15...receiver. Figure 1

Claims (1)

[Claims] In a wireless communication device including a plurality of antenna elements and a circulator having more terminals than the number of antenna elements, at least one of the terminals of the circulator is connected to a transceiver section of the wireless communication device. ,
A wireless communication device characterized in that the remaining terminals of the circulator are connected to each of the plurality of antenna elements.