JP2001168756A - Antenna sharing device and electromagnetic relay used for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antenna sharing device capable of cutting off radio equipment and a band-pass filter from the others when adjusting the frequency of them and preventing break of the radio equipment. SOLUTION: During adjustment of the frequency of the radio equipment M1, M2, M3 and M4 and the band-pass filters 11, 12, 13 and 14, these electromagnetic relays 31, 32, 33 and 34 cut off the radio equipment and the band-pass filters from a connection terminal T0 and connects terminating devices 21, 22, 23 and 24 to the connection terminal. After the adjustment of the frequency of the radio equipment and the band-pass filters cut off from the connection terminal is completed by a control part 30, the electromagnetic relays cut off a terminating device from the connection terminal and connect the adjustment completed radio equipment and band-pass filters to the connection terminal again. Thus, an electric length viewing a band-pass filter side from the connection terminal is kept fixed over the period of the operations and the radio equipment does not destroy the other radio equipment during the adjustment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna duplexer, and more particularly, to a plurality of frequency-variable band-pass filters,
And a coupler for connecting them to the antenna, wherein the plurality of band-pass filters have a pass band frequency adjustable, and one end is connected to the corresponding radio,
The coupler has a plurality of filter connection terminals connected to the other ends of the plurality of bandpass filters and a coupling terminal connected to a single antenna, respectively, and the plurality of radios are connected to the single unit. The present invention relates to an antenna duplexer that enables transmission and reception of radio waves by sharing an antenna, and an electromagnetic relay used therein.

[0002]

2. Description of the Related Art FIG. 3 is a block diagram showing a conventional example of the above antenna duplexer. Antenna duplexer 101 of FIG.
Are frequency-variable band-pass filters 11, 12, 13,
14 (hereinafter referred to as BPFs 11, 12, 13, and 14), a coupler 120 for connecting each of these BPFs 11, 12, 13, and 14 to the antenna ANT, and a BPF
And a control unit 130 for controlling the passband frequencies of 11, 12, 13, and 14. BPF11, 12,
One end of each of the terminals 13 and 14 is connected to each of the wireless devices M1, M2, M3, and M4, and the other end is connected to each of the filter connection terminals T11, T12, T13, and T14 of the coupler 120. The passband frequencies (center frequencies) of the BPFs 11, 12, 13, and 14 are controlled by the control unit 130.

[0003]

In the case of the above-mentioned antenna duplexer, when the tuning frequency changes or changes, the center frequency of the BPF also changes continuously with it. For this reason, there is no problem when the transmission and reception frequencies of the wireless devices M1, M2, M3, and M4 are different from each other, but a problem occurs when the same frequency is transiently obtained.
For example, if the radio M1 is transmitting at 310 MHz and the radio M2 is transmitting at 300 MHz, and the radio M2 is instructed to change the transmission frequency to 320 MHz, the radio M2 and the BPF 12 Is 3
It is controlled to tune from 00 MHz to 320 MHz. At this time, since the tuning frequencies of the radio M2 and the BPF 12 change from 300 MHz to 320 MHz, the transmission and reception frequencies of the radio M1 transitionally coincide with 310 MHz. Then, the output of the wireless device M1 is reflected on the wireless device M1, or the output of the wireless device M1 wraps around the wireless device M2. As a result, the wireless devices M1 and M2 may be destroyed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and separates the radio and the band-pass filter from the others during the adjustment of the frequencies. Can be connected to the antenna ANT via the coupling terminal together with the antenna, and the electric length seen from the coupling terminal can be kept constant during the operation thereof, and any one of the radios can adjust the above adjustment. An object of the present invention is to provide an antenna duplexer that does not destroy other wireless devices during a period and a suitable electromagnetic relay used for the duplexer.

[0005]

In order to solve the above-mentioned problems, the present invention comprises a plurality of frequency-variable band-pass filters and a coupler for connecting them to an antenna, wherein the plurality of band-pass filters are connected. The filter has a passband frequency adjustable, one end is connected to a corresponding radio, and the coupler is connected to a plurality of filter connections respectively connected to the other ends of the plurality of bandpass filters. An antenna duplexer having a terminal and a coupling terminal to which a single antenna is connected, and enabling the plurality of radios to transmit and receive radio waves by sharing the single antenna. Is a terminator disposed corresponding to each of the plurality of filter connection terminals, and disposed corresponding to each of the plurality of filter connection terminals, the filter connection terminal or A plurality of switching connection means capable of switching and connecting a terminator arranged corresponding to the filter connection terminal to the coupling terminal; and an instruction to transmit / receive at a predetermined frequency is given to any of the plurality of radio devices. When the switch connection means is controlled, the connection between the filter connection terminal connected to the corresponding band-pass filter and the coupling terminal is disconnected, and the switch connection means is connected to connect the terminator to the coupling terminal. A control unit configured to control the frequency of the corresponding band-pass filter to the predetermined frequency, and then return the connection between the relevant band-pass filter and the coupling terminal to an original state.

According to such a configuration, during the period of adjusting the frequencies of the radio and the band-pass filter, the switching connection means disconnects the radio and the band-pass filter from the coupling terminal, and connects the terminator to the coupling terminal. After the frequency of the radio and the band-pass filter disconnected from the coupling terminal has been adjusted by the control unit, the switching connection means disconnects the terminator from the coupling terminal, and the adjusted radio and the band-pass filter are again coupled to the coupling terminal. Connect to Therefore, the electrical length as viewed from the coupling terminal to the bandpass filter side during the period of these operations is kept constant,
It does not happen that one of the radios destroys the other radio during the adjustment.

In the embodiment of the present invention, the radios M1, M2, M3, M4 and the bandpass filters 11,
In the period of adjusting the frequencies of 12, 13, and 14,
Electromagnetic relays 31, 32, 33, 34 as switching connection means
Disconnects the radios M1, M2, M3, M4 and the bandpass filters 11, 12, 13, 14 from the coupling terminal T0, connects the terminators 21, 22, 23, 24 to the coupling terminal T0, and disconnects from the coupling terminal T0. Wireless devices M1, M
2, M3, M4 and bandpass filters 11, 12, 1
After the control unit 30 completes the adjustment of the frequencies 3 and 14, the electromagnetic relays 31, 32, 33 and 34 switch the terminators 21 and
22, 23, 24 are disconnected from the coupling terminal T <b> 0, and the adjusted radios M <b> 1, M <b> 2, M <b> 3, M <b> 4 and the bandpass filters 11, 12, 13, 14 are again connected to the coupling terminal T <b> 0.

Further, according to the present invention, in the electromagnetic relay which can be commonly used as the plurality of switching means, a leaf spring is fixed to a terminal of a cable connected to the coupling terminal,
A common contact is arranged at the tip portion, the terminal of the core of the cable from the band-pass filter is set as the first contact, the terminal of the core of the cable from the terminator is set as the second contact, and the exciting coil is set to the excited state or the non-connected state. By switching to the excited state, the common contact is switched and connected to the first contact or the second contact.

According to such a configuration, the common contact fixed to the leaf spring or the core wire of the cable serves as a contact for switching, so that an adverse effect such as a change in the electrical length due to the hermetic terminal conventionally used is used. Therefore, it is easy to accurately set the electrical length as viewed from the coupling terminal to the band-pass filter side.

In the embodiment of the present invention, the common contact comprises a leaf spring 54 and a c-contact 57 attached to the tip of the high-frequency connection line L10, and the first contact a
The contact is composed of a high-frequency connector core 55 connected to the band-pass filter, and the second contact, which is the b-contact, is composed of the core 56 of the cable connected to the terminator. By switching to the excited state, the c contact 57 is switched to the a contact 55 or the b contact 56 for connection.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram showing a configuration of an embodiment of an antenna duplexer according to the present invention, and FIG. 2 is a configuration diagram showing an electromagnetic relay which can be suitably used as an electromagnetic relay of the antenna duplexer of FIG. The antenna duplexer 10 of FIG. 1 includes bandpass filters 11, 12, 13,
14 (hereinafter referred to as BPFs 11, 12, 13, and 14), a coupler 20 for appropriately connecting these BPFs 11, 12, 13, and 14 to the antenna ANT, and a BPF 11,
Control unit 3 for controlling 12, 13, 14 and combiner 20
0. BPF11, 12, 13, 1
4 has one end connected to each of the wireless devices M1, M2, M3, and M4, and the other end connected to the filter connection terminal T1 of the coupler 20.
1, T12, T13, and T14. The passband frequencies (center frequencies) of the BPFs 11, 12, 13, and 14 are controlled by the control unit 30. Although not shown, the BPFs 11, 12, 13, and 14 in this case adjust the pass band frequency by rotating the internal conductor disposed in the cavity along the thread and changing the position thereof. There are types.

In the coupler 20, the terminator 2 corresponds to the filter connection terminals T11, T12, T13, T14.
1, 22, 23, 24 and electromagnetic relays 31, 32, 3
3, 34 are provided. Electromagnetic relays 31, 32, 3
Reference numerals 3 and 34 respectively have a c contact, which is a common contact, and a and b contacts that are switched and connected to the c contact. The c-contacts of the electromagnetic relays 31, 32, 33 and 34 are connected to the antenna AN via lines L11, L12, L13 and L14, respectively.
T is connected in common to all connected coupling terminals T0. The a contacts of the electromagnetic relays 31, 32, 33, 34 are connected to filter connection terminals T11, T12, T13, T14, respectively. Further, the electromagnetic relays 31, 3
The b contacts of 2, 33, 34 are terminators 21, 22, 23,
24, respectively. Terminator 2
The other ends of 1, 22, 23 and 24 are connected to the ground. In this case, c of the electromagnetic relays 31, 32, 33, 34
Regardless of whether the contact is connected to the a contact or the b contact, the lines L11, L12, L13, L14 are connected from the coupling terminal T0.
The electrical length is set to be λ / 4 in any case.

Next, the control operation of the control unit 30 will be described. The control unit 30 has a CPU and a memory as main components, and when given a frequency to be transmitted and received by the wireless devices M1, M2, M3, and M4, the electromagnetic relays 31, 32, 33,
A control signal is sent to 34 to control so that the c contact is connected to the b contact. Further, the control unit 30 controls the BPFs 11, 1
Radio frequencies M1, M2, M3, M
4 so as to match the transmission / reception frequency. When these settings are completed, the control unit 30 sets the electromagnetic relays 31 and 3
A control signal is sent to 2, 33, and 34 so that the c contact is connected to the a contact. When the setting is completed in this way, the wireless devices M1, M2, M3, and M4 establish BPFs 11, 1
Antenna ANT via 2, 13, 14 and coupler 20
And can transmit and receive at different frequencies.

As described above, the radios M1, M2, M3,
When M4 is transmitting and receiving at different frequencies, for example, the wireless device M1 is transmitting at 310 MHz, the wireless device M2 is transmitting and receiving at 300 MHz, and the wireless device M2 is transmitting and receiving at 320 MHz. The case where it is necessary to change to will be described. Control unit 30
Detects that the radio M2 has received an instruction to perform transmission and reception at 320 MHz, gives an instruction to the electromagnetic relay 32, disconnects the a contact and the c contact, and connects the b contact and the c contact. (In this case, the connection terminal T0 to the line L
When looking at the 12 side, the electrical length is set to be λ / 4 when the c contact is connected to the a contact and when the c contact is connected to the b contact.) Next, BPF
Twelve center frequencies are changed from 300 MHz to 320 MHz.

After setting the center frequency of the BPF 12 to 320 MHz, the control unit 30 instructs the electromagnetic relay 32 to release the connection between the contact b and the contact c and connect the contact a to the contact c. In the case described above, the control unit 30
Center frequency of PF12 from 300MHz to 320MHz
When the center frequency of the BPF 12 is changed to
1 may be the same as 310 MHz, at which time the a contact of the electromagnetic relay 32 is connected to the coupling terminal T0.
It has no effect because it is disconnected from
That is, even if the transmission / reception frequency of a certain radio device is transiently matched with the transmission / reception frequency of another radio device, it may be sneak from another radio device or reflected by another radio device as in the past. There is no inconvenience caused by such an operation, and there is no need to temporarily stop the functions of other wireless devices in order to avoid them, and the function as an antenna duplexer can be sufficiently performed.

Electromagnetic relays 31 and 3 are main constituents for satisfactorily performing the functions of the antenna duplexer described above.
2, 33 and 34, an electromagnetic relay 50 that can be used in common among them will be described with reference to FIG. In the electromagnetic relay 50 configured as shown in FIG.
1 when no current is flowing through the high-frequency connection line L10
The leaf spring 54 fixed to the end of the
The c-contact 57 is pressed against the high-frequency connector core wire 55 for the a-contact, and the insulating slider 53 is pressed against one end of the suction piece 52. Therefore, the other end of the attracting piece 52 rotatably held by the exciting coil 51 is held at a position distant from the exciting coil 51. In this case, another spring irrelevant to the leaf spring 54 may be provided on the excitation coil 51 or the like in order to hold the attraction piece 52 away from the excitation coil 51.

When a current is applied to the exciting coil 51, the exciting coil 51 attracts the other end of the attracting piece 52, so that one end of the attracting piece 52 is insulated against the elastic force of the leaf spring 54. The moving element 53 is pushed up, and the leaf spring 54 is pushed up. The c contact 57 is always in contact with the high frequency connector core wire 55 for the a contact when the exciting coil 51 is not excited. When the exciting coil 51 is excited, the leaf spring 54 is pushed by the insulating slider 53, and the connection line 58 and the c-contact 57 come into contact. Since the connection line 58 and the cable core wire 56 for the b-contact are soldered, they are connected to the terminator 59. As described above, in the electromagnetic relay 50, the semi-rigid cable that is the high-frequency connection line L10 does not use the hermetic terminal, but uses the terminal of the high-frequency connection line L10 as a leaf spring to prevent a change in the electrical length due to the hermetic terminal. . Furthermore, the use of the high-frequency connector core wire directly, without using the hermetic terminal as the a contact, also prevents the change in the electrical length due to the hermetic terminal. Therefore, it is easy to realize the electrical length λ / 4.

[0018]

As described above in detail, the antenna duplexer of the present invention comprises a plurality of frequency-variable band-pass filters,
And a coupler for connecting them to the antenna, wherein the plurality of band-pass filters have a pass band frequency adjustable, and one end is connected to the corresponding radio,
The coupler has a plurality of filter connection terminals connected to the other ends of the plurality of bandpass filters and a coupling terminal connected to a single antenna, respectively, and the plurality of radios are connected to the single unit. An antenna duplexer that enables transmission and reception of radio waves by sharing an antenna of the antenna, wherein the coupler includes a terminator arranged corresponding to each of the plurality of filter connection terminals, and the plurality of filters. A plurality of switching connection means arranged to correspond to each of the connection terminals and capable of switching and connecting the filter connection terminal or the terminator arranged corresponding to the filter connection terminal to the coupling terminal; When an instruction for transmission and reception at a predetermined frequency is given to any of the plurality of wireless devices, the switching connection unit is controlled to connect a filter connected to the corresponding band-pass filter. After disconnecting the connection between the terminal and the coupling terminal, controlling the switching connection means to connect the terminator to the coupling terminal, and setting the frequency of the corresponding band-pass filter to the predetermined frequency, And a control unit for returning the connection between the band-pass filter and the coupling terminal to the original state. This allows
During the period of adjusting the frequency of the radio and the band-pass filter, the switching connection means disconnects the radio and the band-pass filter from the coupling terminal, connects the terminator to the coupling terminal, and disconnects the radio and the band separated from the coupling terminal. After the frequency of the pass filter has been adjusted by the control unit, the switching connection means disconnects the terminator from the connection terminal, and connects the adjusted radio and the band-pass filter to the connection terminal again. Therefore, the electrical length as viewed from the coupling terminal to the band-pass filter side during the period of these operations is kept constant, and one of the radios destroys the other radio during the adjustment period. Nothing happens.

Further, the present invention provides an electromagnetic relay which can be commonly used as the plurality of switching means, wherein a leaf spring is fixed to an end of a cable connected to the coupling terminal,
A common contact is arranged at the tip portion, the terminal of the core of the cable from the band-pass filter is set as the first contact, the terminal of the core of the cable from the terminator is set as the second contact, and the exciting coil is set to the excited state or the non-connected state. By switching to the excited state, the common contact is switched and connected to the first contact or the second contact. As a result, the common contact fixed to the leaf spring or the core wire of the cable serves as a contact for switching, so that there is no adverse effect such as a change in the electrical length due to the hermetic terminal used conventionally, and from the coupling terminal. It is easy to accurately set the electrical length as viewed from the bandpass filter side.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of an antenna duplexer according to the present invention.

FIG. 2 is a configuration diagram showing an electromagnetic relay that can be suitably used as the electromagnetic relay of the antenna duplexer in FIG. 1;

FIG. 3 is a block diagram showing a configuration of a conventional antenna duplexer.

[Explanation of symbols]

10 Antenna duplexer 11, 12, 13, 14 Bandpass filter (BP
F) 21, 22, 23, 24 Terminator 30 Control unit 31, 32, 33, 34 Electromagnetic relay M1, M2, M3, M4 Radio T11, T12, T13, T14 Filter connection terminal T0 Coupling terminal ANT Antenna

 ──────────────────────────────────────────────────続 き Continued on front page (72) Inventor Masaharu Suematsu 3-14-20 Higashinakano, Nakano-ku, Tokyo Kokusai Electric Co., Ltd. (72) Inventor Tatsuo Nagaoka 3-14-20 Higashinakano, Nakano-ku, Tokyo Kokusai Electric F term in the company (reference) 5J006 KA03 KA24 LA29 5K011 AA10 BA03 DA01 DA22 DA25 DA27 GA04 GA05 GA06 KA04 KA11

Claims (2)

[Claims] 1. A plurality of frequency-variable band-pass filters, and a coupler for connecting them to an antenna, wherein the plurality of band-pass filters have a pass-band frequency adjustable, and one end is provided. Each connected to a corresponding radio, the coupler has a plurality of filter connection terminals connected to the other ends of the plurality of band-pass filters and a coupling terminal to which a single antenna is connected, respectively. An antenna duplexer that enables the plurality of wireless devices to transmit and receive radio waves while sharing the single antenna, wherein the coupler is arranged corresponding to each of the plurality of filter connection terminals. Combining the terminator arranged corresponding to each of the plurality of filter connection terminals, and the filter connection terminal or the terminator arranged corresponding to the filter connection terminal. A plurality of switching connection means that can be switched to a terminal, and when an instruction for transmission / reception at a predetermined frequency is given to any of the plurality of wireless devices, the switching connection means is controlled, and the corresponding bandpass filter is Disconnect the connection between the connected filter connection terminal and the coupling terminal, control the switching connection means to connect the terminator to the coupling terminal, and set the frequency of the corresponding bandpass filter to the predetermined frequency. An antenna duplexer, comprising: a control unit for returning the connection between the corresponding band-pass filter and the coupling terminal to an original state after the setting. 2. The electromagnetic relay according to claim 1, wherein a leaf spring is fixed to a terminal of a cable connected to said coupling terminal, and a common contact is disposed at a tip portion thereof. Then, the terminal of the core of the cable from the band-pass filter is used as the first contact, the terminal of the core of the cable from the terminator is used as the second contact, and the exciting coil is switched between the excited state and the non-excited state. An electromagnetic relay for switching and connecting the contact to the first contact or the second contact.