JP2012209720A - Antenna sharing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antenna sharing system capable of sharing many frequencies with a narrow sharing frequency interval, with low loss, relating to a radio system having many radio channels in a narrow band.SOLUTION: A multichannel duplexer, which shares an antenna by compositing many radio transmitter outputs, includes a first transmission system 30A in which, input terminals 31-31into which signals from radio transmitters are inputted are connected to isolators 32-32, chBPF 33-33. They are composited using connection cables 34-34constituted with electrical length of around λ/2, and then transmitted through a transmission band BPF 36a connected with a cable 35constituted with the electrical length of around λ/2, as well as a second transmission system 30B which is configured like the first transmission system 30A. These two transmission systems 30A and 30B are composited by 2-mixing 2-distributing device 38 comprising a hybrid circuit, and outputted to an antenna terminal 39.

Description

  The present invention relates to an antenna sharing system in which an antenna is shared by a large number of wireless devices in wireless communication.

  2. Description of the Related Art In mobile radio such as a car phone that uses VHF band or UHF band radio waves, an antenna sharing system in which an antenna is shared by a large number of radio devices has been conventionally used.

  In the antenna sharing system, there is a conventional system using a chBPF (channel / bandpass filter) or a system using a plurality of two mixers composed of a hybrid circuit and a transmission band BPF.

  FIG. 13 shows a block configuration of a 10-channel duplexer using a conventional chBPF, which includes a first transmission system 10A and a second transmission system 10B.

The first transmission line 10A has input terminals ₁₁ 1 to 11 ₅ via the isolator ₁₂ 1 to 12 ₅ from ChBPF13 ₁ to 13 ₅ of the duplexer the output of the frequency is different for example five radio transmitter (Tx1~Tx5) Fill in, connect the configured connection cable ₁₄ 1-14 ₄ between these chBPF13 ₁ ~13 ₅ of the output terminal in electrical length of lambda / 2. The above λ is a wavelength at the used frequency.

The second transmission system 10B, the first transmission line 10A similarly to the isolator 12 from the input terminal _{11 6-11 10} duplexer the output of the frequency is different for example five radio transmitter (Tx6~Tx10) ₆ Are input to the chBPF 13 _{6 to} 13 ₁₀ through 12 _10, and the output terminals of these ch BPF 13 _{6 to} 13 ₁₀ are connected by connection cables 14 _{6 to} 14 _{9 having} an electrical length of λ / 2.

Then, the outputs of the first transmission system 10A and the second transmission system 10B are combined by connection cables 15 ₁ and 15 ₂ each having an electrical length of λ / 2, and output to the antenna terminal 17 via the transmission band BPF 16. .

According to the above configuration, sharing is possible with a low loss of 3 to 4 dB. However, since the shared frequency interval depends on the attenuation characteristics of the chBPFs 13 _{1 to} 13 ₁₀ , the frequency of each wireless transmitter is minimized. On the other hand, there is a limit of “0.06%”, and sharing at a narrower frequency interval becomes impossible. For this reason, it cannot be used in a wireless system having a large number of wireless channels in a narrow band.

  FIG. 14 shows a block configuration of a conventional 10-channel duplexer using a plurality of two mixers composed of a hybrid circuit and a transmission band BPF, and includes a first transmission system 20A and a second transmission system 20B.

In the first transmission system 20A, for example, the outputs of four wireless transmitters (Tx1 to Tx4) having different frequencies are output from the input terminals 21 _{1 to} 21 _{4 of the} duplexer via the isolators 22 _{1 to} 22 ₄ and the two mixers 23 _1. , 23 ₂ , and these two mixers 23 ₁ , 23 ₂ are connected to the two mixers 24 ₁ .

On the other hand, in the second transmission system 20B, for example, the outputs of six radio transmitters (Tx5 to Tx10) having different frequencies are output from the input terminals 21 _{5 to} 21 _{10 of the} duplexer via the isolators 22 _{5 to} 22 ₁₀ and the two mixers. Input to 23 ₃ to 23 ₅ . Also, the second mixer ₂₃ 3, 23 ₄ through the second mixer 24 ₂ connected to one input terminal of the second mixer 25, the other input of the second mixer 25 the output of the second mixer 23 ₅ Connect to the terminal.

Then, after mixing the output of the second mixer 25 of the second mixer 24 ₁ of the first transmission line 20A and the second transmission line 20B in second mixer 26, and outputs it to the antenna terminal 28 through the transmission band BPF 27.

  The antenna sharing system shown in FIG. 14 uses the inter-terminal coupling attenuation amount of the hybrid circuit, and theoretically can reduce the shared frequency interval as much as possible. Since the distribution loss increases, the total becomes very large, about 15 to 16 dB, and the efficiency is poor, so that it is not practical for a high-power radio station.

  In addition, as a known technique related to the present invention, two transmission systems for taking out a plurality of transmitter outputs through an isolator and a channel filter and combining them with a power combining circuit are provided, and these two transmission outputs are combined with a hybrid circuit. A transmission sharing device (for example, refer to Patent Document 1) that combines and outputs to an antenna, and two transmission systems that take out a plurality of transmitter outputs through an isolator and a band-pass filter are provided. There is an antenna duplexer (for example, refer to Patent Document 1) in which the transmission output of the system is connected to an antenna via a power combining network and a Tx filter.

JP-A-3-185932 JP-A-5-55812

As described above, the conventional antenna sharing system using the chBPF shown in FIG. 13 can be shared with a low loss of 3 to 4 dB, but the shared frequency interval depends on the attenuation characteristics of the chBPFs 13 _{1 to} 13 _10. Therefore, it is about “0.06%” with respect to the frequency of each wireless transmitter at the minimum, and sharing at a narrow frequency interval is impossible. For this reason, it cannot be used in a wireless system having a large number of wireless channels in a narrow band.

  Further, the conventional antenna sharing system using a plurality of two mixers including the hybrid circuit and the transmission band BPF shown in FIG. 14 uses the inter-terminal coupling attenuation of the hybrid circuit, and theoretically sets the shared frequency interval. Although it is possible to make it narrower, the common loss is very large, about 15 to 16 dB in total because of the addition of the distribution loss of the output of each two mixers, and the efficiency is poor. do not become.

  The present invention has been made to solve the above problems, and in a wireless system having a large number of wireless channels in a narrow band, it is possible to share multiple frequencies with a narrow shared frequency interval, and a low-loss antenna sharing system. The purpose is to provide.

  In addition, the present invention provides an antenna sharing system capable of sharing multiple transmission frequencies with a low loss and a narrow shared frequency interval in a wireless system having a large number of wireless channels in a narrow band, and also sharing transmission and reception. The purpose is to do.

  An antenna sharing system according to a first aspect of the present invention is an antenna duplexer that combines a plurality of radio transmitter outputs to share an antenna, and connects a plurality of first system signal input terminals to a channel BPF via an isolator. The output of each channel BPF is synthesized by a connection cable comprising an electrical length of about ½ wavelength, and then transmitted via a transmission band BPF connected by a cable comprising an electrical length of about ½ wavelength. A plurality of transmitter input terminals of the first transmission system and the second system to be connected to the channel BPFs via the isolators, respectively, and a connection cable that configures the output of each channel BPF with an electrical length of about ½ wavelength A second transmission system that performs transmission via a transmission band BPF connected by a cable configured with an electrical length of about ½ wavelength, the previous first transmission system, and the second A two-mixing two-distributor composed of a hybrid circuit that mixes and distributes the output of the transmission system to the first and second antenna terminals, and is connected to the first and second antenna terminals, respectively, in a horizontal plane on the side of the tower And a first antenna and a second antenna installed in a direction of about 180 ° with each other, and the first and second antennas are operated as a two-combined antenna to be omnidirectional in a horizontal plane. .

  An antenna sharing system according to a second aspect of the present invention is an antenna duplexer that combines a plurality of radio transmitter outputs to share an antenna, and connects a plurality of signal input terminals of the first system to a channel BPF via an isolator. The output of each channel BPF is synthesized by a connection cable comprising an electrical length of about ½ wavelength, and then transmitted via a transmission band BPF connected by a cable comprising an electrical length of about ½ wavelength. A plurality of transmitter input terminals of the first transmission system and the second system to be connected to the channel BPFs via the isolators, respectively, and a connection cable that configures the output of each channel BPF with an electrical length of about ½ wavelength After the synthesis, a second transmission system for transmitting through a transmission / reception duplexer connected by a cable having an electrical length of about ½ wavelength, a previous first transmission system, and a second transmission A two-mixing / two-distributor comprising a hybrid circuit that mixes the output of the system and distributes it to the first and second antenna terminals, and is connected to the first and second antenna terminals, respectively, on the side of the tower in a horizontal plane An amplifier and a distributor for receiving signals received by the first and second antennas installed in a direction of about 180 ° from each other and the first and second antennas and outputted from the reception terminal of the duplexer And a receiving system for inputting to a plurality of wireless receivers via the antenna, and the first and second antennas are operated as a two-combined antenna to make the horizontal plane omnidirectional and shared for transmission and reception It is characterized by having constituted so.

  According to a third invention, two antenna sharing systems according to the second invention are provided, and a plurality of radio receivers having a diversity reception function are provided in common to the two systems. The output is input to one input terminal of each wireless receiver, and the distribution output of the receiving distributor of the second system is input to the other input terminal of each wireless receiver to perform diversity reception, The first and second antennas of each system are installed on the sides of the tower in the direction of about 180 ° with respect to each other in a horizontal plane, and the antennas between the systems are arranged in a positional relationship of about 90 ° with each other. It is characterized by.

  ADVANTAGE OF THE INVENTION According to this invention, in the radio | wireless system which has many radio channels in a narrow band, multi-frequency sharing is possible at a narrow common frequency space | interval, and a low-loss antenna sharing system can be provided.

  Also, it is possible to provide an antenna sharing system that can be used for both transmission and reception and that can obtain good directivity by using the side surface of the tower even when there is no antenna installation space at the top of the tower, and also has a diversity function. it can.

It is a block diagram which shows the structure of the 10ch sharing device which concerns on Example 1 of this invention. It is a figure which shows the example of a transmission side passage loss characteristic of the 10ch duplexer which concerns on the Example 1. FIG. It is a figure which shows the inter-terminal coupling | bonding attenuation amount in the common frequency space | interval in the same transmission system | strain of the 10ch sharing device which concerns on the Example 1. FIG. It is a figure which shows the amount of coupling | bonding attenuation between terminals in the shared frequency space | interval between two transmission systems of the 10ch duplexer which concerns on the Example 1. FIG. It is a block diagram which shows the structure of the 10ch sharing device which concerns on Example 2 of this invention. It is a block diagram which shows the structure of the 10ch sharing device which concerns on Example 3 of this invention. It is a figure which shows the example of arrangement | positioning at the time of mutually installing the antenna of the 10ch duplexer which concerns on the Example 3 in the 180 degree direction mutually in the horizontal surface using the side surface of the steel tower. It is a figure which shows the horizontal surface directivity in the antenna arrangement example of FIG. It is a block diagram which shows the structure of the 10ch sharing device which concerns on Example 4 of this invention. It is a block diagram which shows the structure of the 10ch sharing device which concerns on Example 5 of this invention. In the 10ch duplexer which concerns on the same Example 5, it is a top view which shows the example of arrangement | positioning at the time of installing two antennas using a steel tower side surface. It is a figure which shows the horizontal plane directivity of the antenna connected to the 1st antenna sharing device in the example of antenna arrangement shown in FIG. 11, and the antenna connected to the 2nd antenna sharing device. It is a block diagram which shows the structure of the 10ch duplexer using the conventional channel BPF. It is a block diagram which shows the structure of the conventional 10ch duplexer using several 2 mixers and transmission band BPF.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a block configuration example of a 10-channel duplexer 100A according to Embodiment 1 of the present invention, which includes a first transmission system 30A and a second transmission system 30B.

The first transmission line 30A, the frequencies are different for example five radio transmitter (Tx1~Tx5) input terminal ₃₁ 1 to 31 ₅ via the isolator ₃₂₁ to 323 ₅ than ChBPF (channel band duplexer the output of the pass _filter) 33 1 input to -33 _5, connected by a configured connection cable ₃₄ 1-34 ₄ between these ChBPF33 ₁ to 33 ₅ of the output terminal in electrical length of about lambda / 2. The above λ is a wavelength at the used frequency. Further input to the transmission band BPF36a by the chBPF33 ₁ ~33 ₅ connecting cable 35 ₁ configured to synthesize output of about lambda / 2 electrical length of, via a connection cable 37a for outputting the arbitrary length of the transmission band BPF36a Then, the signal is input to one input terminal of a mixer, for example, a two-mixing / two-distributor 38 formed of a hybrid circuit. In the transmission band BPF 36a, a pass band width is set in accordance with the transmission band of the first transmission system 30A.

Further, the second transmission system 30B receives the outputs of, for example, five wireless transmitters (Tx6 to Tx10) having different frequencies as in the first transmission system 30A from the input terminals 31 _{6 to} 31 ₁₀ of the duplexer, and isolators 32 _6. to 32 ₁₀ via an input to chBPF33 ₆ ~33 _10, connected by a configured connection cable ₃₄ 6-34 ₉ between the output terminals of these chBPF33 ₆ ~33 ₁₀ in electrical length of about lambda / 2. Further input to the transmission band BPF36b by the connection cable 35 ₂ comprised a composite output electrical length of about lambda / 2 of the chBPF33 ₅ ~33 _10, via a connection cable 37b for outputting the arbitrary length of the transmission band BPF36b To the other input terminal of the two-mixing / two-distributor 38. In the transmission band BPF 36b, a pass band width is set in accordance with the transmission band of the second transmission system 30B.

  In the two-mixing / two-distributor 38, one output terminal is connected to the antenna 40 as an antenna terminal 39, and a pseudo load resistor R is connected between the other output terminal and the ground. That is, the two-mixing / two-distributor 38 synthesizes the multi-frequency transmitter outputs output from the first transmission system 30A and the second transmission system 30B, and outputs the combined output from the antenna terminal 39 to the antenna 40.

  In the above configuration, the shared frequency interval of the frequencies f1 to f5 of the radio transmitters Tx1 to Tx5 in the first transmission system 30A is, for example, the first frequency f1 when the transmission frequency of the radio transmitter Tx1 is the first frequency f1. For example, it is set to “+ 0.06%”.

That is,
f2 = f1 + (f1 × 0.06%)
f3 = f2 + (f1 × 0.06%)
f4 = f3 + (f1 × 0.06%)
f5 = f4 + (f1 × 0.06%)
Set to.

  The shared frequency interval of the frequencies f6 to f10 of the radio transmitters Tx6 to Tx10 in the second transmission system 30B is, for example, “+0” with respect to each frequency f1 to f5 of the radio transmitters Tx1 to Tx5 in the first transmission system 30A. .006% ".

That is,
f6 = f1 + (f1 × 0.006%)
f7 = f2 + (f2 × 0.006%)
f8 = f3 + (f3 × 0.006%)
f9 = f4 + (f4 × 0.006%)
f10 = f5 + (f5 × 0.006%)
Set to.

FIG. 2 shows the passage loss characteristics between the input terminals 31 _{1 to} 31 ₅ , 31 _{6 to} 31 ₁₀ and the antenna terminal 39 in the _10- channel duplexer 100A shown in the first embodiment. Each radio transmitter Tx1 A low loss characteristic of about 5 dB is obtained at a frequency fN (N = 1 to 10) of .about.Tx10. In FIG. 2, the horizontal axis represents frequency and the vertical axis represents passage loss (dB).

Figure 3 shows the binding attenuation characteristic at between the input terminals _{31 6-31 10} between the input terminals ₃₁ 1 to 31 ₅ in the first transmission line 30A, and the second transmission line 30B, the The frequency fN (N = 1 to 10) of the wireless transmitter is 40 dB or more that satisfies the general required performance of 35 dB or more of the duplexing terminal coupling attenuation at the frequency interval of “+ 0.06%”. Attenuation is obtained.

  FIG. 4 shows the coupling attenuation characteristic between the duplexer input terminals between the transmission system 1 and the transmission system 2. The frequency interval of “0.006%” is set to the frequency fN of each radio transmitter. Thus, an attenuation of 40 dB or more is obtained.

  Therefore, when the shared frequency interval is “0.06%” or more with respect to the frequency fN of each radio transmitter, it is shared in the same transmission system as shown in the first embodiment, and the shared frequency interval is further increased. In the case of narrow “0.006%” or more, sharing is possible by dividing the shared frequency between the first transmission system 30A and the second transmission system 30B, and sharing is possible with low loss and a narrow shared frequency interval. .

  That is, the multi-frequency transmitter outputs output from the first transmission system 30A and the second transmission system 30B are connected and synthesized by the 2-mixing / two-distributor 38 configured by a hybrid circuit, and output to the antenna terminal 39. At this time, between the first transmission system 30A and the second transmission system 30B, the shortage of the attenuation characteristic of the chBPF is compensated with the inter-terminal coupling attenuation amount of the two-mixing / two-distributor 38, so that The shared frequency interval between the two transmission systems 30B is minimum and can be about "0.006%" with respect to the corresponding frequency fN, and the shared loss can be shared with a low loss of 5 to 6 dB by using the chBPF method. It becomes possible.

  In the first embodiment, the case where the frequency interval of each radio transmitter is set to “+ side” with respect to the frequency fN has been described. However, the frequency interval of each radio transmitter is set to “− side” with respect to the frequency fN of each radio transmitter. In this case, the same result as in the first embodiment can be obtained.

  Next, an antenna sharing system according to Embodiment 2 of the present invention will be described.

  FIG. 5 is a block diagram of a 10-channel duplexer 100B according to the second embodiment of the present invention. In the second embodiment, in the 10-channel duplexer 100A shown in the first embodiment, a reception system 50 is further provided so that the antenna 40 can be shared not only for transmission but also for reception. The same parts as those in the first embodiment shown in FIG.

  As shown in FIG. 5, the 10ch duplexer 100B according to the second embodiment includes a transmission / reception duplexer 51 instead of the transmission band BPF 36b of the second transmission system 30B according to the first embodiment. The transmission / reception duplexer 51 has a transmission BPF whose pass bandwidth is set in accordance with the transmission band of the second transmission system 30B, and a pass bandwidth that is set in accordance with the reception band (10 channels) of the reception system 50. The reception BPF is configured to include a transmission terminal for inputting a transmission signal, a reception terminal for outputting a reception signal, and a transmission / reception terminal connected to the 2-mixing / two-distributor 38.

The received signal taken out from the receiving terminal of the duplexer 51 is amplified by the amplifier 52 and input to the receiving 10 distributor 53. The receiving 10 distributor 53 distributes the signal received by the antenna 40 to the radio receivers (Rx6 to Rx10) from the output terminals 54 _{6 to} 54 ₁₀ .

In the above configuration, the transmission signal output from the chBPF 33 _{6 to} 33 ₁₀ of the second transmission system 30B is sent to the 2-mixing / two-distributor 38 via the transmission / reception duplexer 51, and the transmission signal of the first transmission system 30A The signals are combined and transmitted from the antenna 40.

The signal received by the antenna 40 is taken out via the reception BPF of the 2-mixing / two-distributor 38 and the transmission / reception duplexer 51, amplified by the amplifier 52, and then output by the receiving 10 distributor 53 to the output terminal 54. _{6 to} 54 ₁₀ and distributed to each radio receiver (Rx6 to Rx10).

  According to the second embodiment, as in the first embodiment, the shared frequency interval between the first transmission system 30A and the second transmission system 30B is the minimum and is about "0.006%" with respect to the frequency fN of each radio transmitter. In addition, the shared loss can be shared with a low loss of 5 to 6 dB by using the chBPF method, and can also be used for both transmission and reception.

  Next, an antenna sharing system according to Embodiment 3 of the present invention will be described.

  FIG. 6 is a block diagram of a 10-channel duplexer 100C according to the third embodiment of the present invention. In the third embodiment, in the 10-channel duplexer 100A shown in the first embodiment, the two-mixing / two-distributor 38 is not connected to the pseudo resistor R, and the two output terminals are the antenna terminals 39a and 39b. 40b is connected. Since other configurations are the same as those of the first embodiment shown in FIG. 1, the same reference numerals are given to the same portions, and detailed description thereof is omitted.

  The antennas 40a and 40b are, for example, directional antennas that are installed using a side surface of a steel tower or the like, and operate as a two-unit synthetic antenna. Here, various directivities can be obtained by selecting the directivity of the antenna alone and the arrangement thereof.

  FIG. 7 shows an arrangement example when the antennas 40a and 40b are 180 ° beam antennas and are installed in the 180 ° direction in the horizontal plane using the side surface of the steel tower 46.

  FIG. 8 shows planar directivity when the antennas 40a and 40b are 180 ° beam antennas and the antenna interval D is about 12λ in the antenna arrangement example of FIG. 7, and directivity levels are obtained in almost all directions. Even when the top of the steel tower cannot be used, almost no directivity is obtained.

  In the third embodiment, for example, when an antenna is added to the steel tower 46, the antennas 40a and 40b can be installed using the side surface of the steel tower 46 even when the top of the steel tower 46 has no margin and cannot be added. Can be achieved. Further, by outputting the distribution output of the 2-mixing 2-distributor 38 to the two antennas 40a, 40b, the output efficiency of the antenna can be improved without wasting the distributed output of the 2-mixing 2-distributor 38. .

  Also in the third embodiment, as in the first embodiment, the shared frequency interval between the first transmission system 30A and the second transmission system 30B is minimum and is “0.006%” with respect to the frequency fN of each radio transmitter. The sharing loss can be shared with a low loss of 5 to 6 dB by using the chBPF method.

  Next, an antenna sharing system according to Embodiment 4 of the present invention will be described.

  FIG. 9 is a block diagram of a 10-channel duplexer 100D according to the fourth embodiment of the present invention. In the fourth embodiment, the receiving system 50 is provided in the third embodiment as in the second embodiment so that the antenna 40 can be shared not only for transmission but also for reception. Since this receiving system 50 has the same configuration as that of the second embodiment, the same parts are denoted by the same reference numerals and detailed description thereof is omitted.

  According to the fourth embodiment, the transmission function and the reception function are provided as in the second embodiment, and when the antenna is added to the tower 46, the side of the tower 46 can be expanded even if the top of the tower 46 has no allowance. The antennas 40a and 40b can be installed using

  Also in the fourth embodiment, as in the first embodiment, the shared frequency interval between the first transmission system 30A and the second transmission system 30B is the minimum and is “0.006%” with respect to the frequency fN of each radio transmitter. In addition, the shared loss can be shared with a low loss of 5 to 6 dB by using the chBPF method, and can also be used for both transmission and reception.

  Next, an antenna sharing system according to Embodiment 5 of the present invention will be described.

  FIG. 10 is a block diagram of a 10-channel duplexer 100E according to the fifth embodiment of the present invention. In the fifth embodiment, a duplexer having a diversity function of a total of 10 channels is configured by combining the first antenna duplexer 100D1 and the second antenna duplexer 100D2 having the same configuration as that shown in the fourth embodiment. is there.

The first transmission system 30A in the first antenna duplexer 100D1 uses, for example, three radio transmitters (Tx1 to Tx3), and outputs are isolators 32 _{1 to} 32 from input terminals 31 _{1 to} 31 ₃ of the duplexer. ₃ through the input to ChBPF33 ₁ ~ 33 _3, connected by a configured connection cable ₃₄ 1, 34 ₂ between these ChBPF33 ₁ ~ 33 ₃ output terminal an electrical length of about lambda / 2. Furthermore the ChBPF33 ₁ connected to 33 ₃ of the synthesized output to the transmission band BPF36a ₁ by configured connection cable 35 ₁ in an electric length of about lambda / 2, the connection cable 37a for outputting the arbitrary length of the transmission band BPF36a ₁ Is connected to one input terminal of the 2-mixing 2-distributor 38a.

The second transmission line 30B is input to chBPF33 ₄ ~33 ₆ through the isolator ₃₂ 4-32 ₆ from the input terminal ₃₁ 4-31 ₆ duplexer the output of the three wireless transmitters (Tx4~Tx6) The output terminals of these chBPFs 33 _{4 to} 33 ₆ are connected by connection cables 34 ₄ and 34 _{5 having} an electrical length of about λ / 2. Further input to the transmission terminal of the duplexer 51a by configured connection cable 35 ₂ above chBPF33 ₄ ~33 ₆ electric length of the combined output of about lambda / 2 of the. The transmission / reception duplexer 51a connects the transmission / reception shared terminal to the other input terminal of the two-mixing / two-distributor 38a via a connection cable 37b having an arbitrary length, and the two output terminals of the two-mixing / two-divider 38a are connected to each other. The antenna terminals 39a and 39b are connected to the two antennas 40a and 40b.

  As the antennas 40a and 40b, for example, directional antennas are used as shown in FIG. 11, and the first transmission system 30A and the second transmission system are installed in a 180 ° direction in the horizontal plane using the side surface of the steel tower 46. Operate as a two-combined antenna of 30B and the first receiving system 50A.

Further, in FIG. 10, the reception terminal of the transmission / reception duplexer 51a is connected to the reception 10 distributor 53a via the amplifier 52a, and each distribution terminal of the reception 10 distributor 53a is connected to the output terminals 54a _{1 to} 54a _10. Are connected to one input terminal of 10 radio receivers (Rx1 to Rx10) having a diversity function, thereby constituting a first receiving system 50A.

The third transmission line 30C in the second antenna duplexer 100D2 are two radio transmitters (Tx7, Tx8) using the input terminal ₃₁ 7 duplexer its output, 31 ₈ from the isolator ₃₂ 7, 32 ₈ via the input to chBPF33 _7, 33 _8, connected by a connecting cable 34 ₇ comprised between the output terminals of these chBPF33 _7, 33 ₈ with electrical length of about lambda / 2. Furthermore the chBPF33 _7, 33 connect the ₈ combined output of about lambda / by second connecting cable 35 ₃ composed of an electric length to the transmission band BPF36a _2, connection cable 37c for any length the output of this transmission band BPF36a ₂ Is connected to one input terminal of the 2-mixing 2-divider 38b.

The fourth transmission system 30D inputs the outputs of the two wireless transmitters (Tx9, Tx10) from the input terminals 31 ₉ and 31 _{10 of} the duplexer to the chBPF 33 ₉ and 33 ₁₀ via the isolators 32 ₉ and 32 _10. The output terminals of these chBPFs 33 ₉ and 33 ₁₀ are connected by a connection cable 34 ₉ having an electrical length of about λ / 2. Further input to the transmission terminal of the chBPF33 _{9, 33} duplexer 51b by configured connection cable 35 _{4 10} synthetic output in electrical length of about lambda / 2 of the. The transmission / reception duplexer 51b connects the transmission / reception shared terminal to the other input terminal of the two-mixing / two-distributor 38b via a connection cable 37d having an arbitrary length, and the two output terminals of the two-mixing / two-divider 38b are connected to each other. The antenna terminals 39c and 39d are connected to the two antennas 40c and 40d.

  As the antennas 40c and 40d, directional antennas are used, and the third transmission system 30C and the fourth transmission system 30D are installed in the direction of 180 ° in the horizontal plane using the side surface of the steel tower 46 as shown in FIG. And it is made to operate | move as a 2 group synthetic | combination antenna of the 2nd receiving system 50B. In this case, the antennas 40c and 40d of the second antenna duplexer 100D2 are arranged while maintaining a 90 ° positional relationship with the antennas 40a and 40b of the first antenna duplexer 100D1.

The receiving terminal of the duplexer 51b is connected to the receiving 10 distributor 53b through the amplifier 52b, and each distributing terminal of the receiving 10 distributor 53b is connected to the receiving terminal 54b _{1 to} 54b ₁₀ through the output terminals 54b1 to 54b10. The second receiving system 50B is configured by connecting to the other input terminals of ten radio receivers (Rx1 to Rx10) having a diversity function.

In the above configuration, in the first transmission system 30A in the first antenna duplexer 100D1, the transmission signals output from the wireless transmitters (Tx1 to Tx3) are input terminals 31 _{1 to} 31 _{3 of} the duplexer, and the isolators 32 ₁ to 32 ₁ . 32 ₃ and via a transmission bandwidth BPF36a ₁ is sent to the second mixing 2 distributor 38a.

Further, in the second transmission system 30B, transmission signals output from the wireless transmitters (Tx4 to Tx6) are shared by the input terminals 31 _{4 to} 31 ₆ , the isolators 32 _{4 to} 32 ₆ , the chBPF 33 _{4 to} 33 ₆ and the transmission / reception shared. It is sent to the 2-mixing 2-distributor 38a via the device 51a. The 2-mixing / two-distributor 38a mixes the three-channel transmission signal from the first transmission system 30A and the three-channel transmission signal from the second transmission system 30B, and outputs the mixed signal to the antennas 40a and 40b.

The antennas 40a and 40b transmit a signal mixed by the 2-mixing / two-distributor 38a toward the mobile radio and receive a signal transmitted from the mobile radio. The signals received by the antennas 40a and 40b are taken out through the 2-mixing / two-distributor 38a and the transmission / reception duplexer 51a, amplified by the amplifier 52a, and input to the receiving 10 distributor 53a. The reception 10 distributor 53a distributes the received signal amplified by the amplifier 52a from the output terminal _54a 1 _{~54a 10} to one input terminal of a radio receiver (Rx1~Rx10).

On the other hand, in the third transmission system 30C in the second antenna duplexer 100D2, the transmission signals output from the wireless transmitters (Tx7, Tx8) are input to the duplexer input terminals 31 ₇ and 31 ₈ and isolators 32 ₇ and 32 _8. , ChBPF 33 ₇ , 33 ₈ and the transmission band BPF 36a ₂ are sent to the 2-mixing 2 distributor 38b.

Further, in the fourth transmission system 30D, transmission signals output from the wireless transmitters (Tx9, Tx10) are shared by the input terminals 31 ₉ , 31 ₁₀ , isolators 32 ₇ , 32 ₈ , chBPF 33 ₉ , 33 ₁₀ and transmission / reception shared. It is sent to the 2-mixing 2-distributor 38b via the vessel 51b.

  The 2-mixing 2-distributor 38b mixes the 2-channel transmission signal from the third transmission system 30C and the 2-channel transmission signal from the fourth transmission system 30D, and transmits the mixed signals from the antennas 40c and 40d to the mobile radio. To do.

The antennas 40c and 40d transmit the signal mixed by the two-mixing / two-distributor 38b toward the mobile radio and receive the signal transmitted from the mobile radio. The signals received by the antennas 40c and 40d are taken out via the 2-mixing / two-distributor 38b and the transmission / reception duplexer 51b, amplified by the amplifier 52b, and input to the receiving 10 distributor 53b. The reception 10 distributor 53a distributes from the output terminal _54b 1 _{~54b 10} the received signal amplified by the amplifier 52b to the other input terminal of the radio receiver (Rx1~Rx10).

  The radio receivers (Rx1 to Rx10) having the diversity function compare the signal received by the first receiving system 50A and the signal received by the second receiving system 50B, and select the signal having the better quality. Output.

  In FIG. 12A, as shown in FIG. 11, the antennas 40a and 40b of the first antenna duplexer 100D1 are 180 ° beam antennas and are arranged at 180 ° directions in the horizontal plane using the side surface of the tower 46. In this case, the directivity level is obtained in almost all directions.

  FIG. 12 (b) shows that the antennas 40c and 40d of the second antenna duplexer 100D2 are 180 ° beam antennas, use the side surface of the steel tower 46 in the 180 ° direction with respect to each other in the horizontal plane, and share the first antenna. The horizontal plane directivity when the antenna 40a, 40b of the container 100D1 is disposed while maintaining the positional relationship of 90 ° is shown, and directivity levels are obtained in almost all directions.

  Accordingly, by arranging the antennas 40a and 40b of the first antenna duplexer 100D1 and the antennas 40c and 40d of the second antenna duplexer 100D2 in the horizontal plane of the same height of the tower 46 as shown in FIG. The antenna sharing system corresponding to the directivity diversity by the directivity shown in FIGS. 12 (a) and 12 (b) can be configured.

  According to the fifth embodiment, similar to the first embodiment, the transmission side shared loss can be shared with a low loss of 3 to 4 dB, and the multi-channel duplexer operates well, and the first antenna duplexer 100D1. The antennas 40a and 40b of the second antenna and the antennas 40c and 40d of the second antenna duplexer 100D2 can be operated with a diversity reception function.

  Further, sharing is possible by dividing the shared frequency between the first antenna duplexer 100D1 and the second antenna duplexer 100D2, and sharing is possible with low loss and a narrow frequency interval.

  Furthermore, the transmission frequency interval between the first antenna duplexer 100D1 and the second antenna duplexer 100D2 should be as narrow as theoretically considering the spatial coupling attenuation between the antennas between the duplexers. Is possible.

  Further, when an antenna is added to the steel tower 46, the antenna can be installed using the side surface of the steel tower 46 even if the top of the steel tower 46 has no margin and cannot be added, and the initial purpose can be achieved.

  In each of the above embodiments, the case of implementation in a 10-channel duplexer has been described. However, the number of channels of the wireless transmitter or the wireless receiver is not limited to 10 channels, and may be set to an arbitrary number of channels. Is possible.

  Further, the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying constituent elements without departing from the scope of the invention in the implementation stage.

30A ... first transmission line, 30B ... second transmission lines, 30C ... third transmission line, 30D ... fourth transmission _system, the input terminals 31 1 to 31 _{10 ... duplexer,} 321 to 323 _{10 ...} isolator, 33 ₁ ... 33 ₁₀ ... chBPF, 34 _{1 to} 34 ₄ , 34 _{6 to} 34 ₉ ... Connection cable, 35 _{1 to} 35 ₄ ... Connection cable, 36a, 36a ₁ , 36a ₂ ... Transmission band BPF, 36b ... Transmission band BPF, 37a ~ 37d ... Connection cable, 38, 38a, 38b ... 2 mixing 2 distributor, 39, 39a-39d ... Antenna terminal, 40, 40a-40d ... Antenna, 46 ... Steel tower, 50 ... Reception system, 50A ... First reception system, 50B: second receiving system, 51, 51a, 51b: transmission / reception duplexer, 52, 52a, 52b ... amplifier, 53, 53a, 53b ... 10 distributor for reception, 54 _{1 to} 54 ₁₀ ... signal output terminal of the reception system, 54a _{1 to} 54a ₁₀ ... signal output terminal of the first reception system, signal output terminal of the second reception system, 100A ... 10ch duplexer according to the first embodiment, 100B ... 10ch duplexer according to example 2, 100C ... 10ch duplexer according to example 3, 100D ... 10ch duplexer according to example 4, 100E ... 10ch duplexer according to example 5.

Claims (3)

In an antenna duplexer that combines multiple radio transmitter outputs and shares an antenna,
A plurality of signal input terminals of the first system are respectively connected to the channel BPF via an isolator, and the output of each channel BPF is synthesized by a connection cable having an electrical length of about 1/2 wavelength, and then about 1/2 A first transmission system that performs transmission via a transmission band BPF connected by a cable configured with an electrical length of a wavelength;
A plurality of transmitter input terminals of the second system are respectively connected to the channel BPF via an isolator, and the output of each channel BPF is synthesized by a connection cable having an electrical length of about ½ wavelength, and then about 1 / A second transmission system for transmitting via a transmission band BPF connected by a cable composed of two wavelengths of electrical length;
A two-mixing two-distributor comprising a hybrid circuit that mixes the outputs of the first transmission system and the second transmission system and distributes the output to the first and second antenna terminals;
The first and second antennas are respectively connected to the first and second antenna terminals, and installed on the side of the steel tower in a direction of about 180 ° in a horizontal plane,
The antenna sharing system, wherein the first and second antennas are operated as a two-combined antenna so as to be omnidirectional in a horizontal plane. In an antenna duplexer that combines multiple radio transmitter outputs and shares an antenna,
A plurality of signal input terminals of the first system are respectively connected to the channel BPF via an isolator, and the output of each channel BPF is synthesized by a connection cable having an electrical length of about 1/2 wavelength, and then about 1/2 A first transmission system that performs transmission via a transmission band BPF connected by a cable configured with an electrical length of a wavelength;
A plurality of transmitter input terminals of the second system are respectively connected to the channel BPF via an isolator, and the output of each channel BPF is synthesized by a connection cable having an electrical length of about ½ wavelength, and then about 1 / A second transmission system for performing transmission via a transmission / reception duplexer connected by a cable composed of two wavelengths of electrical length;
A two-mixing two-distributor comprising a hybrid circuit that mixes the outputs of the first transmission system and the second transmission system and distributes the output to the first and second antenna terminals;
First and second antennas connected to the first and second antenna terminals, respectively, and installed in a direction of about 180 ° in a horizontal plane on the side of the steel tower;
A reception system for receiving a reception signal received by the first and second antennas and output from a reception terminal of the transmission / reception duplexer to a plurality of radio receivers via an amplifier and a reception distributor;
An antenna sharing system characterized in that the first and second antennas are operated as a two-combined antenna so as to be omnidirectional in a horizontal plane and shared for transmission and reception.   The antenna sharing system according to claim 2 is provided in two systems, and a plurality of radio receivers having a diversity reception function are provided in common in the two systems, and a distribution output of the first system distribution distributor is provided to each radio receiver. The signal is input to one input terminal, and the distribution output of the receiving divider of the second system is input to the other input terminal of each radio receiver to perform diversity reception. The antenna sharing system is characterized in that the two antennas are respectively installed on the sides of the tower in the direction of about 180 ° in a horizontal plane, and the antennas between the respective systems are arranged in a positional relationship of about 90 ° with each other. .

Images