JPH0846541A - Common use device for antenna system - Google Patents

Abstract

PURPOSE:To realize the common use device for an antenna system in which number of long feeders is less at a low installation cost. CONSTITUTION:A received power by an antenna ANT is fed to a reception amplifier RA via a 1st transmission reception combiner TRC1. Its amplified output is fed to a transmission reception common use coaxial line CX 2 via a 2nd transmission reception combiner TRC 2 and fed to plural receivers via a 3rd transmission reception combiner TRC 3, a reception coaxial line RC 3 and a branching filter SN. Outputs of the plural transmitters are combined by the combiner CN and fed to the antenna ANT via the 3rd transmission reception combiner TRC 3, the transmission reception common use coaxial line CX2, the 2nd transmission reception combiner TRC 2 and the 1st transmission reception combiner TRC1. The 1st and 2nd transmission reception combiners and the receiver amplifier RA are provided right under the antenna. The operating power of the reception amplifier is supplied via the core wire of the reception coaxial line, the core wire of the transmission reception common use coaxial line, the 3rd transmission reception and the 2nd transmission reception combiner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aerial system shared device for a base station in mobile communication such as a car phone or a mobile phone.

[0002]

2. Description of the Related Art On the side of a mobile device in mobile communication such as a car phone or a mobile phone, the transmission power is reduced as much as possible in order to reduce the adverse effects of high frequency power on users and to reduce the weight of the power supply. There is a need to. As a result, a large amount of received power must be amplified on the base station side.Therefore, if the antenna received power is introduced to the receiving amplifier in the station via the power supply line, a relatively long power supply line can be obtained. As a result, the transmission loss in this feeder becomes relatively large, and as a result, the S
It is unavoidable that / N deteriorates. In order to eliminate such drawbacks, an antenna-type shared device as shown in FIG. 6 has been proposed and implemented. In FIG. 6, ANT is a transmitting / receiving antenna, TRC is a transmitting / receiving combiner, and the center frequency of the pass band is the center of the receiving band pass filter and the center frequency of the receiving band is the center of the transmitting frequency band. It consists of a bandpass filter for transmission that matches the frequency. RA is a receiving amplifier, which is housed together with the transmitting and receiving combiner TRC in the same housing and is mounted directly below the transmitting and receiving antenna ANT, for example, at the top of the tower where the transmitting and receiving antenna ANT is attached. CN is a transmission multiplexer, and a transmitter is connected to each of a plurality of input terminals. CH ₁ is a closed-flow coil, C is a capacitor, S is a DC power supply, SN is a branching filter for reception, and a receiver is connected to each of a plurality of output terminals. These are installed in the station building of the base station. To be CX is a coaxial cable for both transmission and reception, RC ₁
And RC ₂ is a receiving coaxial line, and TC is a transmitting coaxial line.

The output power of the DC power supply S is applied to the power supply section of the reception amplifier RA through the core wire of the block flow coil CH ₁ and the reception coaxial line RC ₂ . The reception output of the antenna ANT for transmission and reception is
It is added to the reception amplifier RA via the transmission / reception coaxial line CX, the transmission / reception combiner TRC and the reception coaxial line RC ₁ , and its amplified high frequency output is passed through the reception coaxial line RC ₂ , the capacitor C and the reception demultiplexer SN. Are distributed to a plurality of receivers. The outputs of multiple transmitters are combined by the transmitter multiplexer CN, and the transmitter coaxial line TC, transmitter / receiver combiner TRC, and transmitter / receiver coaxial line CX are combined.
It is added to the feeding point of the antenna ANT for transmission and reception via the and excites it.

[0004]

In the conventional shared device shown in FIG. 6, since the transmission loss in the receiving coaxial line RC ₂ is compensated by the gain of the receiving amplifier RA, S /
Although there is no risk of deterioration of N, a relatively long receiving coaxial line RC ₂ connecting the output terminal of the receiving amplifier RA and the input terminal of the receiving demultiplexer SN and the output terminal of the transmitting multiplexer CN. And a transmitter / receiver combiner TRC installed directly under the antenna ANT for transmission and reception
Since a relatively long transmission coaxial line TC that connects the input terminals of the transmission band-pass filter that composes the above is required, the purchase cost of both coaxial lines, the installation work cost for those coaxial lines, and the coaxial line station There is a drawback that rain cut construction costs and the like at the lead-in location will increase.

[0005]

According to the present invention, there is provided a first transmission / reception combiner for selectively adding reception high frequency power of a transmission / reception antenna to a reception amplifier and selectively transmitting transmission high frequency power to a transmission / reception antenna. A second transmission / reception in which the high-frequency power amplified by the power amplifier is selectively applied to the transmission / reception shared power supply line formed of the coaxial line, and the transmission high-frequency power transmitted through the transmission / reception common power supply line formed of the coaxial line is selectively added to the first transmission / reception combiner. The amplified high-frequency power transmitted through the combined power supply line for transmission and reception, which consists of a combiner and a coaxial line, is selectively applied to a plurality of receivers through a power supply line for reception and a duplexer for reception, which are composed of a plurality of transmission lines. Of the third transmitter / receiver combiner for selectively transmitting the transmission high frequency power output from the transmitter multiplexer for synthesizing the output of the machine to the transmitter / receiver common feeder formed by the coaxial line, and the receiving feeder line formed by the coaxial line. Line, a low-pass filter circuit connected between the output terminal of the amplified high-frequency power in the third transmitting / receiving combiner and the common input / output terminal, the core wire of the transmission / reception shared power supply line including the coaxial wire, and the second transmission / reception A first power source for applying a power source to the power source section of the receiving amplifier via a low-pass filtering circuit connected between the common input / output terminal of the combiner and the input terminal of the amplified high frequency power; SUMMARY OF THE INVENTION It is an object of the present invention to eliminate the drawbacks of the prior art by realizing an antenna-type shared device in which the transmitting / receiving combiner, the receiving amplifier, and the second transmitting / receiving combiner are provided immediately below the transmitting / receiving antenna.

[0006]

FIG. 1 is a diagram showing an embodiment of the present invention, ANT
Is a transmitting / receiving antenna, TRC ₁ is a first transmitting / receiving combiner, RA is a receiving amplifier (comprising a low noise amplifier, for example), TRC ₂ is a second transmitting / receiving combiner, TRC ₃ is a third transmitting / receiving combiner,
CN is a transmitter multiplexer, CH ₁ is a closed loop, C is a condenser,
S is a DC power supply, SN is a receiving demultiplexer, CX ₁ and CX ₂ are transmission / reception feeders made of coaxial lines, RC ₁ , RC ₂ and RC ₃ are receiving feeders made of coaxial lines, TC ₁ and TC Reference numeral ₂ is a transmission power supply line composed of a coaxial line. The first to third transmission / reception combiners TRC ₁ to TRC ₃ are, for example, a reception band-pass filter whose center frequency of the pass band matches the center frequency of the reception frequency band and a center frequency of the pass band of the transmission frequency band. It consists of a bandpass filter for transmission that matches the center frequency, and connects the common input / output terminal of the first transmitting / receiving combiner TRC ₁ to the feeding point of the transmitting / receiving antenna ANT via the transmitting / receiving shared feeding line CX ₁ . The input terminal of the transmission band-pass filter forming the _first transmission-reception combiner TRC ₁ is connected to the output terminal of the transmission band-pass filter forming the _second transmission-reception combiner TRC ₂ via the transmission power supply line TC _1. Connect to and receive the first combiner TR
Connect the output terminal of the receiving band-pass filter that constitutes C ₁ to the input terminal of the receiving amplifier RA via the receiving power supply line RC ₁ , and connect the output terminal of the receiving amplifier RA to the receiving power supply line. while connected to the input terminal of the receiving band-pass filtering device which constitutes the second transmission and reception combiner TRC ₂ via the RC _2, the first transceiver combiner TRC _1, the receiver amplifier RA and the second transceiver combiner TRC ₂ Is housed in a common housing and attached directly below the transmitting / receiving antenna ANT, for example, on the top of a tower where the transmitting / receiving antenna ANT is provided. The third transmission / reception combiner TRC ₃ , the transmission multiplexer CN, the DC power supply S, and the reception demultiplexer SN are installed in the base station building, and the common input / output terminals of the third transmission / reception combiner TRC ₃ are provided. , A _second transceiver combiner TR mounted directly under the antenna ANT for transmission / reception via the transmission / reception power supply line CX ₂
Connect to the common input / output terminal of C ₂ and
Connect the input terminals of the transmission band-pass filter that compose TRC ₃ to the output terminals of the transmission multiplexer CN via the transmission power supply line TC _2, and input multiple inputs of the transmission multiplexer CN. A transmitter (not shown) is connected to each of the terminals, and a third transmitter / receiver combiner is connected.
The output terminal of the bandpass filter for reception that constitutes TRC ₃ is connected to the duplexer for reception via the power supply line RC ₃ for reception and the capacitor C.
Connect to the input terminal of SN, and connect a receiver (not shown) to each of the plurality of output terminals of the receiving demultiplexer SN.

FIG. 2 is a wiring diagram showing an example of the configuration of the second and third transmitting and receiving combiners TRC ₂ and TRC ₃ in FIG.
RBPF is a receiving band pass filter, TBPF is a transmitting band pass filter, T _C is an input / output terminal common to the receiving band pass filter RBPF and the transmitting band pass filter TBPF, and T _R is Reception band-pass filter RBPF input / output terminal, T _T is transmission band-pass filter
I / O terminals on the TBPF side, C _C1 , C _C7 and C _6R are I / O coupling capacitances, M _10T is I / O magnetic coupling coefficient, C ₁₂ to C ₅₆ are interstage coupling capacitances, M ₇₈ to M ₉₁₀ are interstage magnetic couplings. Coupling coefficient, SC
_M , SC ₁ and SC ₂ are sub-coupling circuits, ZM is an impedance matching circuit with an external circuit, CH ₂ and CH ₃ are choke lines, and C ₁ to C ₃ and L ₁ and L ₂ are low-pass. The capacitive element and the inductance element forming the filter circuit and LA are lightning arresters. Output terminals T _R of the reception band-pass filtering device RBPF side, in the second transmission and reception combiner TRC ₂ input terminal of the amplifier RF power, a third
In the transmission and reception combiner TRC _{3 of} , it becomes the output terminal of the amplified high frequency power, and the terminal T _T on the side of the transmission band pass filter TBPF is
The second transmission / reception combiner TRC ₂ serves as an output terminal for transmitting high-frequency power, and the third transmission / reception combiner TRC ₃ serves as an input terminal for transmitting high-frequency power. The first transmission / reception combiner TRC ₁ in FIG. ₁ is, for example, the low-pass filter circuit composed of the capacitive elements C ₁ to C ₃ and the inductance elements L ₁ and L _{2 in} the connection diagram shown in FIG. The terminal T _T on the side of the transmission band pass filter TBPF is composed of a circuit excluding the wheels CH ₂ and CH ₃ .
The terminal T _R on the side of the reception band-pass filter RBPF serves as an output terminal of the received high-frequency power.

The output power of the DC power source S shown in FIG. 1 constitutes a _third transmission / reception combiner TRC ₃ through a core wire of a closed-circuit wheel CH ₁ and a coaxial line RC ₃ forming a reception power supply line. added to the non-grounded terminal of the output terminal T _R of the amplifier high frequency power use the band-pass unit RBPF,塞流line wheels CH _2, to no capacitive element C ₁ consisting of C ₃ and the inductance element L _1, L ₂ low Bandpass filtering circuit, choke line CH ₃ , non-grounded terminal of common input / output terminal T _c , core wire of coaxial line CX ₂ forming a shared power supply line for transmission and reception,
The low-pass filter including the non-grounded side terminal of the common input / output terminal T _C of the second transmission / reception combiner TR _{C 2} , the obstruction coil CH ₃ , the capacitance elements C ₃ to C ₁ and the inductance elements L ₂ and L _1. forming circuit,塞流line wheels CH _2, non-grounded terminal of the input terminal T _R of the amplifier high frequency power of a second transmission and reception combiner TRC ₂ receiving the band-pass device RBPF constituting the, and the reception feed line It is added to the power supply section of the receiving amplifier RA through the core wire of the coaxial line RC ₂ . When the power supply unit of the reception amplifier RA is provided with a rectification filter circuit, an AC power supply of commercial frequency is used instead of the DC power supply S, and the AC output power thereof is passed through the same path as described above. It is added to the input side of the rectification filter circuit in the power supply section of RA. In the transmission path of the output power of the power source S, the core wire portion of the coaxial wire CX ₂ provided outside the station building and outside the casing mounted directly below the transmitting and receiving antenna ANT is covered with the outer conductor of the coaxial wire CX _2. Since it is protected from external lightning, a surge current due to induction flows in the transmission path of the output power of the power source S in the case installed directly under the transmitting / receiving antenna ANT and in the station. In this case, the capacitive elements C ₁ to C ₁ provided in the second and third transmitting and receiving combiners TRC ₂ and TRC ₃ are provided.
It is absorbed by the lightning arrester LA connected to the low-pass filter circuit composed of C ₃ and the inductance elements L ₁ and L ₂ . Antenna for transmission and reception
The high frequency power received by ANT is the same as the power supply line CX _{1 for both} transmission and reception.
Common input-output terminal T _C of transmitting and receiving combiner TRC ₁ of is amplified added to the reception amplifier RA via the output terminal T _R and the reception feed line RC ₁ of the reception band-pass filtering device RBPF. The high frequency power amplified by the receiving amplifier RA is the receiving power supply line RC ₂ , second
Bandpass Filter for Receiving Composing TRC ₂
RBPF input terminal T _R , second input / output combiner TRC ₂ common input / output terminal T _C , transmission / reception shared feed line CX ₂ , third transmission / reception combiner TRC ₃ common input / output terminal T _C , third transmission / reception combiner TR
The output terminal T _{R of} the receiving band pass filter RBPF that constitutes C ₃ ,
It is added to the receiving demultiplexer SN via the receiving power supply line RC ₃ and the capacitor C, and distributed to each receiver. Receiver amplifier
Amplification of RA Loss of high-frequency power in the transmission / reception shared power supply line CX ₂ is compensated by the gain in the reception amplifier RA, and S / N
There is no risk of deterioration. Further, the length of the wire material塞流line wheels CH _1, or choose to _^1/4 of the wavelength corresponding to the center frequency of the received frequency band, the塞流line wheels CH ₁ Inpi - to receive the high-frequency power dance By appropriately forming a high impedance, it is possible to prevent the high frequency output of the receiving band-pass filter RBPF which constitutes the _third transmitting / receiving combiner TRC ₃ from being shunted to the power source S side. The outputs of the respective transmitters connected to the transmission multiplexer CN are combined by the transmission multiplexer CN, and the transmission band pass filter that constitutes the _third transmission / reception combiner TRC ₃ via the transmission power supply line TC _2. In addition to the input terminal T _T of the wave transformer TBPF, the common input / output terminal T _{C of} the third transmission / reception combiner TRC ₃ , the common transmission / reception feed line CX ₂ , the common input / output terminal T _{C of} the second transmission / reception combiner TRC ₂ , The output terminal T _{T of} the transmission band-pass filter TBPF that constitutes the _second transmission / reception combiner TRC ₂ , and the transmission power supply line TC
_1, the input terminal T _T of the first transmission band-pass filtering device TBPF constituting the transceiver combiner TRC _1, the first transmission and reception combiner TRC ₁
Is added to the feeding point of the transmitting / receiving antenna ANT via the common input / output terminal T _C and the transmitting / receiving shared feeding line CX ₁ .

FIG. 2 exemplifies a case where the order of the receiving band-pass filter RBPF is 6 and the order of the transmitting band-pass filter TBPF is 4, but each order can be appropriately increased or decreased. The present invention can be embodied as described above, and as shown in FIG. 2, by sub-coupling the resonance circuits which separate two or an integer multiple thereof through magnetic coupling elements or capacitive coupling elements. , A polar bandpass filter can be constructed.
In FIG. 2, two sub-coupling circuits SC _M and SC ₁ are provided on the receiving band pass filter RBPF side to form two pairs of attenuation poles, and on the transmitting band pass filter TBPF side. The case where one sub-coupling circuit SC ₂ is provided to form a pair of attenuation poles is illustrated, but the number of sub-coupling circuits can be appropriately increased or decreased to implement the present invention. A bandpass filter configured as a non-polar type may be used without providing the sub coupling circuit. FIG. 2 exemplifies a case where the inter-stage coupling of the reception band-pass filter RBPF is capacitive coupling and the inter-stage coupling of the transmission band-pass filter TBPF is magnetic coupling. Pass filter RBPF
The inter-stage coupling is magnetically coupled, and the transmission band pass filter TBPF
The inter-stage coupling of the
The inter-stage couplings of the RBPF and the transmission band-pass filter TBPF may be both capacitive coupling or magnetic coupling, but the output power of the DC or commercial frequency AC power supply S is supplied to the power supply section of the receiving amplifier RA. As is clear from the description of the operation, in order to prevent the power supplied from the power source S, in particular, the AC output power of the commercial frequency from being short-circuited to the ground side in the bandpass filter circuit, the reception bandpass filter is used. RBPF output (or input) terminal
Coupling between T _R and the final stage (or initial stage) resonant circuit, coupling between the initial stage (or final stage) resonant circuit of the reception bandpass filter RBPF and the common input / output terminal T _C , Bandpass filter for transmission
Input / output terminals common to the last (or first) resonant circuit of TBPF
Any coupling with T _C needs to be capacitive coupling.
That is, the AC output power of the power source S is equal to the reception band-pass filter.
The output of RBPF (or input) when added to the non-grounded terminal of the terminal T _R, if the coupling between the resonant circuits of the terminal T _R and final stage (or first stage) is magnetic coupling, the terminal T _R the AC power applied to the non-grounded terminal electromagnetic induction, and coupled to the resonant circuit of the final stage (or first stage), but so that the shorted to ground, the resonance of the terminal T _R and final stage (or first stage) If the coupling with the circuit is capacitively coupled, by appropriately selecting the capacitance of the coupling element, it is possible to prevent the AC output power of the power source S from coupling with the resonant circuit at the final stage (or the first stage), When the output of S is DC, the coupling is blocked regardless of the capacitance value of the coupling capacitance element. Even when the input / output coupling element coupled to the common input / output terminal T _C is formed of the capacitive coupling element, the output power of the power source S can be prevented from being short-circuited to the ground side in the same manner as described above.

As described above, in the second and third transmission / reception combiners TRC ₂ and TRC ₃ , the other terminals except the input / output terminal T _T on the side of the transmission bandpass filter TBPF forming the transmission / reception combiner, that is, , addition to the capacitive coupling of each input and output coupling of the common input-output terminal T _C and the input-output terminal T _R of the reception band-pass filtering device RBPF side, by any of capacitive coupling or magnetic coupling and interstage coupling Although the present invention can be implemented by combining them, the center in each pass band of the reception band-pass filter RBPF and the transmission band-pass filter TBPF forming the _{first to} third transmission / reception combiners TRC ₁ to TRC _3. By selecting the relationship between the frequency (resonance frequency) and each inter-stage coupling mode as described below, the transmitting and receiving combiner can be made compact and the insertion loss can be reduced. That is, of the bandpass filters constituting the _{first to} third transmission / reception combiners TRC ₁ to TRC ₃ ,
For example, if the center frequency (resonance frequency) in the pass band of the transmission band pass filter TBPF is lower than the center frequency (resonance frequency) in the pass band of the reception band pass filter RBPF, the transmission band pass filter If the inter-stage coupling of TBPF is magnetic coupling and the inter-stage coupling of receiving band pass filter RBPF is capacitive coupling, the transmission characteristics of both band pass filters are as shown in FIG. In FIG. 3, the horizontal axis represents frequency, the vertical axis represents attenuation, f _L is the center frequency (resonance frequency) in the pass band of the transmission band pass filter TBPF, and f _H is the reception band pass filter RB.
At the center frequency (resonance frequency) in the passband of PF, as is clear from the figure, in the reception bandpass filter RBPF in which the interstage coupling is capacitive coupling, the attenuation characteristics in the frequency range lower than the resonance frequency f _H In the transmission band-pass filter TBPF in which the slope of the curve is steep, the slope of the attenuation characteristic curve in the frequency region higher than the resonance frequency f _H is gentle, and the interstage coupling is magnetic coupling, the resonance frequency f _L The slope of the attenuation characteristic curve is steep in the high frequency region, and the slope of the attenuation characteristic curve is gentle in the frequency region lower than the resonance frequency f _L. Therefore, it is possible to reduce the respective orders of the reception and transmission bandpass filters RBPF and TBPF to increase the amount of attenuation in the attenuation range. Load Q of each resonator constituting the reception and transmission band-pass filtering device RBPF and TBPF the _{(Q L) Q Lk (k} = 1,2,3, -----, n.n
Is the order), the first to third transmission / reception combiners
Insertion loss L _i of TRC ₁ to TRC ₃ is calculated by the following equation.

[Equation 1] Q _u : No load on the resonator Q As is clear from the above equation, the insertion loss becomes smaller as the order decreases, and the transmitting and receiving combiner becomes smaller as the order decreases. The input / output coupling mode of the band-pass filter forming the second and third transmitting / receiving combiners TRC ₂ and TRC ₃ is as described above, but the band-pass filtering forming the _first transmitting / receiving combiner TRC ₁ is the same. The input / output coupling mode of the container may use any coupling mode. FIG. 3 shows a bandpass filter for reception.
RBPF is a polarized band pass filter with two pairs of attenuation poles,
This is the case where the transmission band pass filter TBPF is a polarized band pass filter having a pair of attenuation poles. However, even when both band pass filters are configured as a non-polar type, the interstage coupling mode And the attenuation amount in the frequency region above and below the resonance frequency are the same as in the case of the polar type.

FIG. 4 is a schematic diagram showing an example in which the second and third transmitting and receiving combiners TRC ₂ and TRC ₃ shown in FIG. 2 are constituted by a bandpass filter composed of a coaxial resonator. The common outer conductor in the bandpass filter RBPF, TCA is the common outer conductor in the transmission bandpass filter TBPF, RTS,
RS and TS are partition walls made of conductor plates, R ₁ to R ₁₀ are resonant elements, C ₁₂ to C ₅₆ are inter-stage coupling capacitances, C ₁₆ and C ₆₁ are sub-coupling capacitances, and the sub-coupling circuit SC shown in FIG. to form a _1.
M ₂₅ is a sub magnetic coupling coefficient, which is the sub coupling circuit SC _M shown in FIG.
To form. C _C1 and C _6R are input / output coupling capacitors, LF is Fig. 2
Low-pass filtering circuit, CH ₂ and CH ₃ are塞流line wheels to the capacitive element C ₁ to be formed by the C ₃ and L _1, L ₂ shown in, M _78
Through M ₉₁₀ are inter-stage magnetic coupling coefficients, and C ₇₁₀ and C ₁₀₇ are sub-coupling capacitors, which form the sub-coupling circuit SC ₂ shown in FIG. C _C7
Is an input / output coupling capacitance, M _10T is an input / output magnetic coupling coefficient, T _C is a common input / output terminal, and T _R and T _T are input or output terminals.
The first transmission / reception combiner TRC ₁ shown in FIG. ₁ has the same configuration as that of FIG. 4 except that the low-pass filter circuit LF and the obstruction line wheels CH ₂ and CH ₃ in FIG. 4 are omitted. Bandpass filter for reception
When the RBPF and the transmission band-pass filter TBPF are configured by the coaxial resonator as described above, each resonant element may be arranged in any of an inter-digital type or a combline type,
Also, the present invention can be implemented by forming the receiving band-pass filter RBPF and the transmitting band-pass filter TBPF by any resonator such as a dielectric coaxial resonator or a waveguide cavity resonator. be able to.

The band-pass filter constituting the _{first to} third transmission / reception combiners TRC ₁ to TRC ₃ in the shared device of the present invention is formed into a non-polar band-pass filter, and the pass band has Chebyshev characteristics. When configured as above, the transmission characteristic can be obtained by the following equation.

[Equation 2] ATT: Transmission loss T _n (x): Chebyshev polynomial, in the case of x <1, T _n (x) = cos (n cos ^-1 x) In the case of x> 1, T _n (x) = cosh (n cosh ^-1 x) x: Normalized frequency,

(Equation 3) f ₀ : Center frequency in the pass band of the band pass filter f: Arbitrary transmission frequency B _Wr : Allowable pass frequency bandwidth of the band pass filter S: Allowable voltage standing wave ratio (VSWR) in the pass band When the band pass filter that constitutes the _{first to} third transmission / reception combiners TRC ₁ to TRC ₃ is formed into a polar band pass filter and its pass band is configured to have the Chebyshev characteristic, its transmission The characteristic can be obtained by the following equation.

[Equation 4] As shown in FIG. 2, when the circuit order n of the reception band-pass filter RBPF is 6, and the circuit order n of the transmission band-pass filter TBPF is 4, that is, when n is an even number,

(Equation 5) If the order n is odd,

(Equation 6) f _p : Frequency of band edge that gives the allowable voltage standing wave ratio In the above equation, _Re is the real part and I _m is the imaginary part.

FIG. 5 shows two antennas equipped with the device of the present invention.
Basically, it is a diagram for realizing a space diversity receiving system by installing the antennas at appropriate distances. The symbols, configurations and transmitting / receiving operations of each antenna system are the same as those in FIG. In this case, fading can be suppressed by appropriately processing a received wave including an analog signal or a digital signal received by each of the two antennas, and at least one of the transmitting and receiving antennas can be used as an analog signal. By exciting with the high-frequency power containing the signal and exciting the other transmitting / receiving antenna with the high-frequency power containing the digital signal, it is possible to support both analog and digital communication systems in both transmission and reception.

[0014]

In the device of the present invention, the components of the shared device provided directly below the transmitting / receiving antenna and the components of the shared device provided in the station building of the base station are shared for transmission and reception. Since it is possible to connect with a single power supply line, it is possible to reduce the cost of purchasing the power supply line, the installation work cost, and the rain cutting work cost at the location where the power supply line is pulled into the station building.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a connection diagram of essential constituent elements according to the present invention.

FIG. 3 is a diagram showing a transmission characteristic of a main constituent element in the present invention.

FIG. 4 is a diagram showing an example in which a main constituent element of the present invention is formed of a coaxial resonator.

FIG. 5 is a diagram showing an example in which the present invention is applied to space diversity reception.

FIG. 6 is a diagram showing a conventional antenna-type shared device.

[Explanation of symbols]

ANT Transmission / reception antenna TRC _{1 to} TRC ₃ Transmission / reception combiner RA Reception amplifier CH _{1 to} CH ₃ Obstruction line wheel C Capacitor S power supply SN Reception demultiplexer CN Transmission multiplexer CX ₁ , CX ₂ Transmission / reception shared power supply line RC ₁ to RC ₃ receives electrical supply line TC _1, TC ₂ transmission feed line RBPF reception bandpass wave filter TBPF transmission band-pass filtering unit SC _M sub coupling circuit SC _1, SC ₂ subcombination circuit ZM Inpi - Dance Matching circuit T _C , T _R , T _{T I} / O terminals C _{1 to} C ₃ Capacitance element L ₁ and L ₂ Inductance element LA Lightning arrester C _{12 to} C ₅₆ Interstage coupling capacitance C _C1 , C _{6R I} / O coupling capacitance M ₇₈ to M ₉₁₀ Interstage magnetic coupling coefficient C _C7 Input / output coupling capacitance M _10T Input / output magnetic coupling coefficient R _{1 to} R ₁₀ Resonant element C ₁₆ , C ₆₁ Sub coupling capacitance M ₂₅ Sub magnetic coupling coefficient LF Low pass filter C ₇₁₀ , C ₁₀₇ Secondary coupling capacity RCA, TCA Common outer conductor RS, TS, RTS Bulkhead CX Transmission / reception shared power supply line TRC Transmission / reception combiner TC Transmission power supply line

Claims (3)

[Claims] 1. A first transmission / reception combiner for selectively applying reception high-frequency power of a transmission / reception antenna to a reception amplifier and selectively applying transmission high-frequency power to the transmission / reception antenna, and amplified high-frequency power of the reception amplifier. A second transmission / reception combiner for selectively adding to the first transmission / reception combiner, high-frequency power for transmission transmitted through the transmission / reception shared power supply line formed of the coaxial line. The amplified high-frequency power transmitted through the shared transmission / reception power supply line composed of the coaxial line is selectively added to the plurality of receivers through the reception power supply line and the reception demultiplexer composed of the coaxial line, and the output of the plurality of transmitters. A third transmission / reception combiner for selectively transmitting the transmission high-frequency power output from the transmission multiplexer for synthesizing the transmission line to the transmission / reception shared feed line formed of the coaxial line, and the reception power feed formed of the coaxial line Core wire, a low-pass filter circuit connected between the output terminal of the amplified high-frequency power and the common input / output terminal in the third transmitter / receiver combiner, the core wire of the transmission / reception shared power supply line including the coaxial wire, and An operating power supply for applying operating power to the power supply section of the receiving amplifier via a low-pass filter circuit connected between a common input / output terminal of the second transmission / reception combiner and the input terminal of the amplified high frequency power; And a first transmission / reception combiner, a reception amplifier, and a second transmission / reception combiner provided directly below the transmission / reception antenna. 2. A second and a third transmission / reception combiner each comprising a reception band-pass filter and a transmission band-pass filter, and are used as a reception band-pass filter and a transmission band-pass filter. A low-pass filter circuit is connected between the common input / output terminal and the input / output terminal of the receiving band-pass filter, and is common to the receiving band-pass filter and the transmitting band-pass filter. 2. The shared antenna device according to claim 1, wherein the input / output coupling to the input / output terminal and the input / output coupling to the input / output terminal on the side of the band-pass filter for reception are each capacitive coupling. 3. A stage of a bandpass filter having a higher center frequency in the passband, wherein each of the first to third transmitting / receiving combiners comprises a receiving bandpass filter and a transmitting bandpass filter. The shared antenna device according to claim 1, wherein the inter-coupling is capacitive coupling, and the inter-stage coupling of the band pass filter having a lower center frequency in the pass band is magnetic coupling.