JPH10233706A - Uhf, vhf, cs and bs sharing antenna system and lnb used for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antenna unit where the number of parts can be reduced and mass-productivity and reliability can be improved as a system by mixing the CS-IF signals of a horizontal polarized wave and a vertical polarized wave and mixing them with the mixed signal of the respective signals of UHF, VHF and BS-IF so as to lead them. SOLUTION: A received BS signal is converted into the BS-IF signal of an intermediate frequency in a frequency conversion means and it is mixed with the mixed signal of the UHF signal and the VHF signal from an input terminal, is led out from the output terminal of LNB for BS 118 and is supplied to the input terminal of LNB for CS 116. In LNB for CS 116, the horizontal polarized signal and the vertical polarized signal of the received CS signal are converted into the CS-IF (horizontal polarized wave) and the CS-IF (vertical polarized wave) of the intermediate frequency, and they are mixed. Then, the mixed CS-IF signal is supplied to a second input means. It is mixed with the mixed signal of the signals of UHF, VHF and BS-IF and they are led out from a second output means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to UHF broadcasting, VH
The present invention relates to a UHF / VHF / BS / CS shared antenna system used for reception of F broadcast, satellite broadcast (BS broadcast), satellite communication (CS), and the like, and an LNB used for the same.

[0002]

2. Description of the Related Art FIG. 10 shows a conventional typical UHF broadcast.
1 shows a shared antenna system for receiving VHF broadcast, BS broadcast, and CS broadcast. The LNB (LOW NOISE BLOCK) attached to the BS / CS dual-purpose antenna 101 is the LNB for BS
102 and LNB for CS (for horizontal polarization reception, for example) 104
And LNBs for CS (for vertical polarization reception, for example) 105, for a total of three LNBs. In this case, L for BS
The output cable 113 of the NB 102 is BS-UV (UHF
And VHF together is called UV. The same applies hereinafter) mixer 108
Connected to.

Also, a signal from a terrestrial broadcast VHF TV broadcast antenna 103 and a UHF TV broadcast antenna 10 are used.
The signal from 9 is connected to a UV mixer 110. This U
The output of the V mixer 110, that is, the signals of the UHF broadcast and the VHF broadcast are also connected to the BS-UV mixer 108. The output of the BS-UV mixer, that is, the signals of the UHF broadcast, the VHF broadcast, and the BS broadcast are connected to the block down converter 111.

On the other hand, an output signal from the CS LNB 104 is transmitted through an output cable 106 and the CS LNB 1
The output signals from 05 are respectively connected to the block down converter 111 through the output cable 107.

Here, the block down converter 1
The operation of No. 11 will be described. The vertical polarization (1293-1533 MHz) of the CS-IF, which is the output signal from the CS LNB 105, in order to avoid overlapping of the IF signals obtained by converting the received signal from each satellite into an intermediate frequency in each LNB.
To 1385 to 1625 MHz, the horizontal polarization of the CS-IF which is the output signal from the CS LNB 104 (1308 to 1625 MHz).
1548 MHz) to 1655 to 1895 MHz, respectively.

Accordingly, the output signal of the block down converter 111 is a 70 MHz to 770 MHz UV signal.
The signal, the BS-IF signal of 1035 to 1335 MHz, and the above-described CS-IF horizontal polarization signal and vertical polarization signal are output from the output cable 114, respectively. After that, the signal of the cable 114 is directly connected to the indoor TV set 112 or amplified and distributed for distribution to a plurality of TV sets. Of course, the DC voltage supplied from the block down converter 111 to the BS LNB 102,
A supply DC voltage for the CS LNBs 104 and 105 is supplied.

[0007]

According to the prior art described above, there are six output cables from the antenna unit such as the UV mixer and each LNB, and these need to be connected to the block down converter 111. Outdoor and indoor wiring becomes complicated. Also, an expensive block down converter 111 and BS-UV mixer 108 are separately required, and three independent LNBs are required. Furthermore, 2
A converter 119 for separating and distributing a horizontally polarized signal and a vertically polarized signal to two CS LNBs is separately required, which makes the antenna unit complex and expensive. in this way,
Since the wiring is complicated and expensive as a shared antenna unit, it is used for co-listening, but is rarely used for individual reception.

[0008] In view of the above problems, the present invention realizes an antenna unit for both BS broadcasting and CS broadcasting, which is currently becoming mainstream in Japan, in a compact shape, and has a cost performance including outdoor / indoor wiring and installation work. To provide an antenna unit with a simple configuration that is rich in and yet can be used for individual reception, as well as to reduce the number of parts as a system, and to improve mass productivity and reliability. And

[0009]

In order to solve the above-mentioned problem, the invention according to claim 1 is based on UHF, VHF, BS, CS.
In a shared antenna system, first input means for inputting a mixed signal of a UHF signal and a VHF signal;
First frequency conversion means for converting the S signal into a BS-IF signal of an intermediate frequency; first mixing means for mixing the mixed signal of the UHF signal and the VHF signal with the BS-IF signal; LNB for BS provided with first output means for deriving the output of the mixing means, and second input means for inputting the output signal of the first mixing means derived via the first output means And a second polarizer for converting a horizontal polarization signal of the received CS signal into an intermediate frequency CS-IF (horizontal polarization) signal.
Frequency conversion means, a third frequency conversion means for converting a vertically polarized signal of the received CS signal into a CS-IF (vertical polarization) signal of an intermediate frequency, and the second and third frequency conversion means. Second mixing means for mixing the output;
A third mixing means for mixing the signal supplied from the input means with the output signal of the second mixing means, and a second output means for outputting the output of the third mixing means to the outside. C
And an LNB for S.

Therefore, the received BS signal is converted into an intermediate frequency BS-IF signal by the first frequency conversion means, and then the UHF signal and the VHF signal introduced from the first input terminal are converted.
The signal is mixed with the mixed signal by the first mixing means, and the L
The signal is derived from the first output terminal of the NB and supplied to the second input terminal of the LNB for CS.

On the other hand, in the CS LNB, the received CS
The horizontally polarized signal and the vertically polarized signal of the signal are respectively converted into intermediate frequency CS-IF signals by second and third frequency conversion means.
After being converted into a (horizontal polarization) signal and a CS-IF (vertical polarization) signal, they are mixed by the second mixing means. Then, the CS-IF signal mixed by the second mixing means is guided to the third mixing means, and is supplied to the second input means by the third mixing means.

The signal is mixed with a mixed signal of UHF, VHF and BS-IF signals and is derived from the second output means. Therefore, a mixed signal of UHF and VHF signals and BS-I
UHF, VHF, BS-IF, CS-IF without using a mixer with F signal or block down converter
Thus, it is possible to provide a common antenna system that can derive a mixed signal of the above signals, is simple in configuration, inexpensive, and easy to install.

According to a second aspect of the present invention, there is provided the UH according to the first aspect.
In a F, VHF, BS, CS shared antenna system, first filter means for preventing the BS-IF signal from leaking to the first input means, and a UHF signal supplied to the first input means Filter means for preventing the mixed signal of the VHF signal and the VHF signal from leaking to the BS-IF signal amplifying circuit; Third filter means for preventing the mixed signal of the polarization signal from leaking to the second input means, and a mixed signal of the UHF signal and the VHF signal supplied from the second input means and the BS-IF Fourth filter means for preventing a mixed signal of signals from leaking to an amplifier circuit for amplifying the output of the second mixing means is provided.

Therefore, in the LNB for BS, the first filter means prevents the BS-IF signal from leaking to the first input means via the first mixing means, and the second filter means. Thus, it is possible to prevent the mixed signal of the UHF signal and the VHF signal from leaking to the BS-IF signal amplification circuit via the first mixing means. In the CS LNB, the third filter unit converts the CS-IF signal into the second signal.
Of the UHF signal and the VHF signal and the BS-
This prevents the mixed signal of the IF signal from leaking to the CS-IF signal amplifier circuit. In this way, it is possible to prevent leakage of the signal of the other party which occurs when mixing the signals into the first and second input terminals and the amplifier circuit for the BS-IF signal and the CS-IF signal.

According to a third aspect of the present invention, there is provided the UH according to the second aspect.
In the F, VHF, BS and CS shared antenna system, the first and third filter means are constituted by either LPF (low pass filter) or BPF (band pass filter), and the second and fourth filter means are provided. Is H
It is characterized by comprising either a PF (high pass filter) or a BPF.

The first and third filter means are LPF
Or BPF, the first or second input means can block a BS-IF signal or a CS-IF signal having a higher frequency than the signal supplied to the first or second input terminal. And the second and fourth filter means are composed of HPF or BPF, so that the BS-I
The F-signal or CS-IF signal amplifying circuit receives the BS-IF signal or CS-I signal supplied to each amplifying circuit.
A mixed signal of a UHF signal and a VHF signal having a lower frequency than the F signal or a mixed signal of a UHF signal, a VHF signal, and a BS-IF signal can be prevented.

According to a fourth aspect of the present invention, in the UHF, VHF, BS and CS shared antenna system according to the second and third aspects, the first filter means blocks a signal having a frequency of 1035 MHz or more, and the second filter means Is 770 MHz
The third filter means blocks signals having the following frequencies:
A signal having a frequency of 385 MHz or more is blocked, and a fourth filter means blocks a signal having a frequency of 1335 MHz or less.

Therefore, the first filter means 103
The BS-IF signal, which is a signal having a frequency of 5 MHz or more, is prevented from leaking to the first input terminal, and the first filter having a frequency of 770 MHz or less is prevented by the second filter means.
Of the UHF and VHF signals from the input means is prevented from leaking to the BS-IF signal amplification circuit, and the CS-IF signal, which is a signal having a frequency of 1335 MHz or more, is prevented by the third filter means. 2 is prevented from leaking to the input terminal of
A mixed signal of the UHF, VHF and BS-IF signals from the second input means, which is a signal having a frequency of less than
-Leakage of the IF signal to the amplifier circuit can be prevented.

According to a fifth aspect of the present invention, there is provided an LNB for BS, comprising: input means for inputting a mixed signal of a UHF signal and a VHF signal; frequency conversion means for converting a received BS signal into a BS-IF signal of an intermediate frequency; A first filter for blocking the passage of an IF signal, a second filter for blocking a signal supplied to the input unit, and the BS;
Output means for outputting a signal obtained by mixing a signal obtained through the second filter means with an IF signal and a signal obtained through the first filter means with a signal supplied to the input means; It is characterized by having.

Therefore, the received BS signal is converted into a BS-IF signal by the frequency conversion means, and is derived through the second filter means. On the other hand, the mixed signal of the UHF and VHF signals supplied to the input means is derived through the first filter means. Then, the mixed signal of the UHF and VHF signals derived through the first and second filter means is mixed with the BS-IF signal, and the mixed signal is derived from the output means. Therefore, UHF, VHF and BS are output from the output means.
A first filter means to prevent the BS-IF signal from leaking to the input means, and a second filter means to output the BS-IF signal.
-Leakage of a mixed signal of UHF and VHF signals into an IF signal amplifier circuit can be prevented.

According to a sixth aspect of the present invention, there is provided an LNB for CS, comprising: input means for inputting a signal obtained by mixing a mixed signal of a UHF signal and a VHF signal and a BS-IF signal; First frequency conversion means for converting a CS-IF (horizontal polarization) signal to a second frequency conversion means for converting a vertical polarization signal of a received CS signal into a CS-IF (vertical polarization) signal of an intermediate frequency; Means and means for mixing the outputs of the first and second frequency conversion means via first and second filter means for preventing mutual leakage, and a first mixing means for deriving a mixed CS-IF signal. Means, third filter means for blocking passage of an input signal input to the input means, fourth filter means for blocking passage of a CS-IF signal output from the mixing means, and output from the mixing means. CS- The F signal is derived via the third filter means, second of the signal inputted from said input means for mixing the derived signal through the fourth filter means
And output means for deriving an output signal of the second mixing means.

Accordingly, the horizontal and vertical polarization signals of the received CS signal are respectively converted into intermediate frequency CS-IF (horizontal polarization) signals and CS-IF (vertical polarization) signals by the first and second frequency conversion means. Wave), and is derived via first and second filter means, respectively, which block the passage of the other party's signal. The CS-IF (horizontal polarization) signal and the CS-IF (vertical polarization) signal derived through the first and second filter units are mixed by a first mixing unit to form a CS-IF signal. This CS-IF signal is derived through a third filter means, mixed with a mixed signal of UHF, VHF and BS-IF signals supplied to an input means derived through a fourth filter means, and output. A mixed signal of UHF, VHF, BS-IF and CS-IF signals is derived from the means.

Accordingly, the first and second filter means provide a CS-IF (horizontal polarization) signal and a CS-IF signal.
Each of the (vertically polarized) signal amplifier circuits can prevent adverse effects due to leakage of the signal of the other party when the first signal is mixed by the first mixing means. Further, the third and fourth filter means prevent the UHF, VHF and BS-IF signals supplied to the input means from leaking to the CS-IF signal amplifier circuit and the CS-IF signal from leaking to the input means. Can be prevented.

[0024]

FIG. 1 is a block diagram showing the entire structure of the present invention, and the same reference numerals are given to portions corresponding to the prior art shown in FIG. 1 is different from FIG. 10 in that the BS-UV mixer 108 and the block down converter 111 are no longer necessary, and unlike the LNB for BS 118, the output from the output cable 115 of the UV mixer 110 is different from that in FIG. An input terminal for inputting a signal is provided.

The cable 113 from the output terminal of the LNB 118 is connected to the CS LNB 116, and the CS LNB 116 becomes one unit.
It has an input terminal for connecting the output cable 113 from the NB and an output terminal for outputting a signal to the output cable 117, and the output cable 117 is directly connected to the TV set 112.

FIG. 2 shows a BS having the above-mentioned UV input terminal.
FIG. 3 is a block diagram showing a circuit configuration of the LNB 118. B
The BS input signal input from the S / CS dual-purpose antenna 101 is a right-handed circularly polarized wave of 11.7 GHz to 12.0 GHz, which is output by the phase shifter 2 via the feed horn 1 by a quarter wavelength. After passing through a phase-shifted and linearly-polarized wave, the LNA (Low Noise Amplifier)
r) is supplied to 3. The LNA 3 amplifies weak radio waves from the satellite with low noise and high gain.

The output of the LNA 3 is a BPF (Band Pas
s Filter) 4. The BPF 4 is for removing an image signal. The image signal frequency band of this system is in the range of about 9.3 GHz to 9.6 GHz, and the attenuation in this band is almost equal to the pass band of 11.7 GHz.
The frequency is designed to be -40 dB or less based on a signal of 1 Hz to 12.0 GHz.

After passing through the BPF 4, the signal
Local oscillator DRO (Dielectric Rezonator Oscillato)
r: dielectric band oscillator) 5 to BS receiving oscillation frequency 10.
Mix (Mixer;) into which an oscillation signal of 678 GHz is injected.
Mixing circuit) 6 where 1035 MHz to 133
The frequency is converted to a signal of 5 MHz IF (Intermediate Frequency) band. Then, an IF amplifier (intermediate frequency amplifier) 7 has an appropriate gain characteristic.
Is transmitted to

The output of the IF amplifier 7 is HPF (High Pas
s Filter) 8 and is output to the output terminal 9 as a BS-IF signal.
A signal below the IF signal band is provided so as not to flow into the IF amplifier 7, and may be a BPF.

On the other hand, 76 MHz to 770 MHz input to the input terminal 10 of the UV signal from the UV mixer 110
The UV signal of z is an LPF (Low Pass) provided to prevent the above-described BS-IF signal from flowing into the input terminal 10.
The signal is combined with the output terminal of the HPF 8 through a filter 11, and the UV signal is output from the output terminal 9 together with the BS-IF signal. The LPF 11 has a leakage of the BS-IF signal to the input terminal 10 of the UV signal of about −40.
It is designed to be less than dB and may be BPF.

FIG. 3 shows a CS LN shown in FIG. 1 provided with an input terminal for inputting a mixed signal of a UV signal and a BS-IF signal.
It is a block diagram of a circuit structure of B116. The CS signal input from the BS / CS dual-purpose antenna 101 is supplied to the orthogonal polarization mode converter 21 via the feed horn 20. The CS signal is 12.5 GHz to 12.75 GH
z are horizontal and vertical linearly polarized signals, and are separated into horizontal and vertical polarized signals by the orthogonal polarization mode converter 21. The separated polarization signals are transmitted to individually provided LNAs 22 and 23, respectively.

Here, the horizontally polarized signal is amplified by the LNA 22 with low noise and high gain, and then the BP for removing the image signal is removed.
After passing F24, MIX25 at IF band 1655-18
It is converted to a 95 MHz signal. At this time, the oscillation frequency of the local oscillator DRO26 injected into the MIX 25 is 10.853 GHz. Thereafter, noise reduction is performed by the pre-IF amplifier 27 and transmitted to the HPF 28.

This HPF 28 is used to control the vertical polarization signal CS-I.
In order to prevent the inflow of the F signal, it functions to prevent the flow of the signal of 1625 MHz or less. Then, IF AMP2
At 9, appropriate leveling is performed and transmitted to the HPF 30.
The HPF 30 functions to prevent the inflow of a signal of 1335 MHz or less, which is a signal of a frequency equal to or lower than the BS-IF signal, and may be a BPF. CS that passed the above HPS30
The −IF (horizontal polarization) signal is output from the output terminal 31.

On the other hand, similarly, the vertically polarized signal of the CS signal is
After being amplified by the LNA 23 with low noise and high gain, the signal passes through the BPF 32 for removing an image signal, and is converted by the MIX 33 into an IF band signal of 1385 to 1625 MHz. At this time, the local oscillator DRO3 injected into the MIX 33
The oscillation frequency of No. 4 is 11.108 GHz. Then, after the noise is reduced by the pre-IF amplifier 35, the LP
It is transmitted to F36. The LPF 36 has a frequency of 1655 MHz in order to prevent the inflow of the horizontally polarized CS-IF signal.
It functions to prevent the above signal from flowing.

Thereafter, the HPF 28 for the horizontally polarized signal is used.
, And supplied to the IF amplifier 28. Thereafter, in the same manner as in the case of the above-described horizontal polarization signal, IF AMP2
At 9, appropriate leveling is performed and transmitted to the HPF 30.
The HPF 30 functions to prevent the inflow of a signal of 1335 MHz or less, and may be a BPF. And the above HP
The CS-IF (vertically polarized wave) signal that has passed through F30 is output from the output terminal 31 at the same time as the horizontal polarized signal of the CS-IF signal from the output terminal 31.

From the input terminal 37, a UV signal and BS-IF
A mixed signal of the signals (76 MHz to 1335 MHz) is input and transmitted to the LPF 38. This LPF38
Is to prevent the CS-IF signal output via the HPF 30 from leaking from the input terminal 37, and the attenuation is designed to be -40 dB or less. This LPF
38 may be a BPF. UV passed through the LPF 38
The mixed signal of the signal and the BS-IF signal is supplied to the HPF
30 is mixed with the CS-IF signal on the output side and output terminal 3
1 is derived.

As described above, the BS LNB used in the present invention shown in FIGS. 1 and 2 has the function of the conventional BS-UV mixer 108 shown in FIG. The UV mixer 108 becomes unnecessary. Further, the LNB for CS 116 used in the present invention shown in FIG. 3 has both the functions of the LNB 104 for horizontal polarization and the LNB 105 for vertical polarization shown in FIG. Has both. Therefore, this block down converter 111
Is unnecessary, and the number of CS LNBs is reduced to one. As is clear from comparison between FIG. 1 of the present invention and FIG. 10 of the conventional example, the number of cables from each antenna can be significantly reduced.

(Embodiment 1) The structure of the main part of Embodiment 1 of the present invention is as shown in FIGS. In FIG. 2, the BS-IF signal is a signal below the band of this signal,
That is, here, the UV signal is output to the output terminal 9 via the HPF 8 provided so as not to flow into the IF amplifier 7. The HPF8 has a signal of about 770 MHz or less of about 40.
It is designed to attenuate more than dB.

On the other hand, the signal of 76 MHz to 770 MHz inputted from the input terminal 10 of the UV signal is an L signal provided so that the BS-IF signal does not flow into this input terminal 10.
It is combined with the output terminal of the above HPF 8 through the PF 11,
A signal is also output. The LPF 11 is designed so that a signal of 1035 MHz or more is attenuated by about 40 dB or more.

Next, in the case of the CS LNB shown in FIG. 3, the horizontal-polarized signal and the vertical-polarized signal CS-IF signal, which have been converted into intermediate frequency signals, are mixed, and then IF AMP29.
, The level is appropriately set and transmitted to the HPF 30.
The HPF 30 functions to prevent the inflow of a signal of 1335 MHz or less, which is the band of the UV signal and the BS-IF signal. It is designed so that a signal of 1335 MHz or less is attenuated by about 40 dB or more.

On the other hand, the mixed signal of the UV signal and the BS-IF signal input from the input terminal 37, that is, 76MH
The signal of z to 1335 MHz passes through the above-described HPF through an LPF 38 provided to prevent the CS-IF signal from flowing.
30 and the output terminal 31
A UV signal and a BS-IF signal are output together with the S-IF signal. The LPF 38 is designed so that a signal of 1385 MHz or more is attenuated by about 40 dB or more.

(Embodiment 2) FIG. 4 is a block diagram showing a circuit configuration of a main part of Embodiment 2 of the present invention. In FIG. 4, portions corresponding to the respective components of the BS LNB shown in FIG. The description is omitted. The difference between the configuration of the second embodiment shown in FIG. 4 and the configuration of the first embodiment shown in FIG.
The point that F8 is changed to BPF40 in FIG. The operation of the BPF 40 in this case is substantially the same as that of the HPF 8 of FIG. 2, and the amount of attenuation of the signal of 770 MHz or less is about 40 d.
Design to be B or more. Therefore, the BPF 40 can prevent the UV signal (76 to 770 MHz) input from the input terminal 10 from leaking to the IF amplifier 7.

(Embodiment 3) FIG. 5 is a block diagram showing a circuit configuration of a main part of Embodiment 3 of the present invention. In FIG. 5, parts corresponding to the respective components of the BS LNB shown in FIG. And description thereof is omitted. The difference between the configuration of the third embodiment shown in FIG. 5 and the configuration of the first embodiment shown in FIG.
The filter connected to the input terminal 10 of the UV signal of the NB uses the LPF 11 in FIG. 2, while the BPF 41 is used in the third embodiment shown in FIG.

The operation of the BPF 41 in this case is represented by L in FIG.
The operation of the BPF 41 is substantially the same as the operation of the PF11.
Is designed so that the attenuation of a signal of 1035 MHz or more is 40 dB or more. Therefore, B passing through the HPF 8
S-IF signal (frequency band 1035 to 1335 MHz)
Is blocked by the BPF 41 and the input terminal 1 of the UV signal
Leakage to zero can be prevented.

(Embodiment 4) FIG. 6 is a block diagram showing a circuit configuration of a main part of an embodiment 4 of the present invention. In FIG. 6, parts corresponding to the respective components of the BS LNB shown in FIG. And description thereof is omitted. The difference between the configuration of the fourth embodiment shown in FIG. 6 and the configuration of the first embodiment shown in FIG. 2 is that the HP provided in the subsequent stage of the IF amplifier 7 in the first embodiment shown in FIG.
F8 and LPF 11 connected to input terminal 10 for UV signal
In the fourth embodiment shown in FIG. 6, this is changed to BPFs 42 and 43, respectively. Also in this case, the operations of the BPFs 42 and 43 are the same as those of the HPF 8 and the LP in the first embodiment.
Substantially the same as F11.

The BPF 42 is designed so that the attenuation of a signal of 770 MHz or less is about 40 dB or more, and the BPF 43 is designed so that the attenuation of a signal of 1035 MHz or more is about 40 dB or more. Accordingly, the BPF 42 attenuates the UV signal (frequency band 76 to 770 MHz) input from the input terminal 10 so as not to be input to the IF amplifier 7 at the preceding stage.
Attenuates the BS-IF signal passing through the BPF 42 so as not to be input to the input terminal 10 of the UV signal.

(Embodiment 5) FIG. 7 shows Embodiment 5 of the present invention.
4 is a block diagram showing a circuit configuration of a main part of the second embodiment. Parts corresponding to the respective components of the CS LNB shown in FIG. The configuration of the fifth embodiment shown in FIG.
7 differs from the configuration of the first embodiment in that the HPF 30 provided at the subsequent stage of the IF amplifier 29 of the CS LNB in FIG. 3 is changed to the BPF 44 in FIG. BP in this case
The operation of F44 is substantially the same as that of the HPF 30 of FIG. 3, and is designed so that the attenuation of a signal of 1335 MHz or less is about 40 dB or more. Therefore, the BPF 44 can prevent the signal (frequency band 76 to 1335 HMz) in which the UV signal and the BS-IF signal input to the input terminal 34 are mixed from leaking to the IF amplifier 29.

(Embodiment 6) FIG. 8 is a block diagram showing a circuit configuration of a main part of an embodiment 6 of the present invention. In FIG. 8, parts corresponding to the respective components of the CS LNB shown in FIG. And description thereof is omitted. The configuration of the sixth embodiment shown in FIG. 8 is different from the configuration of the first embodiment shown in FIG.
In FIG. 3, the filter connected to the input terminal 37 of the NB is L
Unlike the PF 38, the BPF 45 is used in the sixth embodiment shown in FIG. In this case BPF4
The operation of No. 5 is substantially the same as the operation of the LPF 38 in FIG. 3, and the BPF 45 is designed so that the attenuation of a signal of 1385 MHz or more is about 40 dB or more. Therefore,
The CS-IF signal passed through the HPF 38 (1385 to 18
95 MHz) is attenuated by the BPF 45 and is prevented from leaking to the input terminal 37.

(Embodiment 7) FIG. 9 is a block diagram showing a circuit configuration of a main part of an embodiment 7 of the present invention. Portions corresponding to each configuration of the CS LNB shown in FIG. The description is omitted. The configuration of the seventh embodiment shown in FIG. 9 is different from the configuration of the first embodiment shown in FIG. 3 in that an HPF 30 provided after the IF amplifier 29 of the CS LNB and an LPF 38 connected to the input terminal 37 are respectively provided. BPF46
And BPF47. Also in this case, BPF4
The operations of 6 and 47 are substantially the same as those of the HPF 30 and the LPF 38 in the first embodiment.

The BPF 46 is designed so that the attenuation of a signal of 1335 MHz or less is about 40 dB or more, and the BPF 47 is designed so that the attenuation of a signal of 1385 MHz or more is about 40 dB or more. Therefore, the UV signal and the BS-IF signal input from the input terminal 37 are attenuated by the BPF 46 to prevent leakage to the IF amplifier 29, and the vertical and horizontal signals of the CS-IF signal passing through the BPF 46 are
The horizontally and horizontally polarized signals are attenuated by the BPF 46 and are input to the input terminal 37.
To prevent leaks.

[0051]

Since the present invention has the above-described structure,
The connection between the UHF, VHF, BS, and CS broadcast receiving antennas and the TV unit can be realized with a small number of cables, and the installation of the broadcasting-common antennas can be performed easily and at low cost. Also, as before, the UV signal and BS-
IF signal mixer, UHF, VHF, BS-IF, C
A block down converter that mixes each signal of S-IF (vertical polarization) and CS-IF (horizontal polarization) becomes unnecessary,
Significant cost reduction can be realized as a system. Furthermore, since the LNB for CS is configured to perform the processing of the vertically polarized wave and the horizontally polarized wave signal by one unit, the number of parts can be reduced, and the mass productivity and reliability can be improved. .

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of the present invention.

FIG. 2 is a circuit block diagram of a first embodiment of a BS LNB which is a main part of the present invention.

FIG. 3 is a circuit block diagram of a CS LNB according to a first embodiment of the present invention;

FIG. 4 is a circuit block diagram of a second embodiment of a BS LNB used in the present invention.

FIG. 5 is a circuit block diagram of a third embodiment of a BS LNB used in the present invention.

FIG. 6 is a circuit block diagram of a fourth embodiment of a BS LNB used in the present invention.

FIG. 7 is a circuit block diagram of a second embodiment of a CS LNB used in the present invention.

FIG. 8 is a circuit block diagram of a third embodiment of a CS LNB used in the present invention.

FIG. 9 is a circuit block diagram of a fourth embodiment of a CS LNB used in the present invention.

FIG. 10 is a block diagram showing a configuration of a conventional example.

[Explanation of symbols]

 5 Local oscillator 6 Mixer 7 IF amplifier 8 Filter 9 Output terminal 10 Input terminal 11 Filter 25 Mixer 26 Local oscillator 28 Filter 29 IF amplifier 30 Filter 31 Output terminal 33 Mixer 34 Local oscillator 36 Filter 37 Input terminal 38 Filter 40 Filter 41 filter 42 filter 43 filter 44 filter 45 filter 46 filter 47 filter 101 BS / CS dual-use antenna 103 VHF TV broadcast antenna 109 UHF TV broadcast antenna 110 UV mixer 116 CS LNB 118 BS LNB for BS

Claims (6)

[Claims] A first input means for inputting a mixed signal of a UHF signal and a VHF signal; a first frequency conversion means for converting a received BS signal into an intermediate frequency BS-IF signal; Mixed signal of VHF signal and BS
A BS provided with first mixing means for mixing an IF signal and first output means for deriving an output of the first mixing means;
LNB, second input means for inputting an output signal of the first mixing means derived via the first output means, and a horizontal polarization signal of the received CS signal at an intermediate frequency C
Second frequency conversion means for converting the signal into an S-IF (horizontal polarization) signal, and third frequency conversion for converting a vertical polarization signal of the received CS signal into an intermediate-frequency CS-IF (vertical polarization) signal Means, a second mixing means for mixing the outputs of the second and third frequency converting means, and a signal supplied from the second input means and an output signal of the second mixing means. UHF, VHF, BS, C, comprising: a third mixing unit; and a CS LNB provided with a second output unit for outputting the output of the third mixing unit to the outside.
S common antenna system. 2. The UHF, VHF, BS,
In the CS shared antenna system, first filter means for preventing the BS-IF signal from leaking to the first input means and UHF supplied to the first input means
Second filter means for preventing a mixed signal of the signal and the VHF signal from leaking to the BS-IF signal amplifier circuit;
Third filter means for preventing a mixed signal of a vertically polarized signal and a horizontally polarized signal of the CS-IF signal mixed by the second mixing means from leaking to the second input means; A fourth filter for preventing a mixed signal of a UHF signal, a VHF signal and a mixed signal of a BS-IF signal supplied from the second input means from leaking to an amplifier circuit for amplifying an output of the second mixing means. UH characterized by providing means
F, VHF, BS, CS shared antenna system. 3. The UHF, VHF, BS,
In the CS shared antenna system, the first and third filter means are constituted by either a low-pass filter or a band-pass filter, and the second and fourth filter means are constituted by either a high-pass filter or a band-pass filter. UHF, VHF, B characterized by doing
S, CS shared antenna system. 4. The first filter means blocks a signal having a frequency of 1035 MHz or more, and the second filter means has a frequency of 77 MHz.
A signal having a frequency of 0 MHz or less is blocked, a third filter means blocks a signal having a frequency of 1385 MHz or more, and a fourth filter means blocks a signal having a frequency of 1335 MHz or less. Items 2 and 3
The UHF, VHF, BS, CS shared antenna system as described. 5. An input means for inputting a mixed signal of a UHF signal and a VHF signal;
Frequency conversion means for converting the signal into an S-IF signal;
A first filter for blocking passage of an IF signal, a second filter for blocking passage of a signal supplied to the input means, and the BS-IF signal obtained through the second filter. An output means for outputting a signal obtained by mixing a signal supplied to said input means and a signal obtained through said first filter means, said LNB for BS. 6. An input means for inputting a mixed signal of a UHF signal, a VHF signal, and a BS-IF signal;
First frequency conversion means for converting a horizontally polarized signal of a signal into an intermediate frequency CS-IF (horizontal polarization) signal; and converting a vertically polarized signal of the received CS signal into an intermediate frequency CS-IF (vertically polarized wave). 2) mixing the second frequency converting means for converting the signal and the outputs of the first and second frequency converting means via first and second filter means for preventing mutual leakage; A first mixing means for deriving an IF signal, a third filter means for blocking passage of an input signal input to the input means, and a CS output from the mixing means.
A fourth filter for blocking the passage of the IF signal, a CS-IF signal output from the mixing means is derived through the third filter, and a signal input from the input means is output to the fourth filter. An LNB for CS comprising: a second mixing unit that mixes a signal derived through a filter unit; and an output unit that derives an output signal of the second mixing unit.