JP4648866B2 - UHF antenna and satellite receiving antenna - Google Patents

Description

  The present invention relates to a UHF antenna suitable for receiving digital terrestrial broadcasting, and a satellite receiving antenna to which the UHF antenna is attached.

  Conventionally, a receiving antenna for receiving a terrestrial broadcast signal transmitted from a television broadcast station using a VHF band or UHF band radio wave (terrestrial wave) usually includes a radiator, a director, and a reflector. Multi-element antennas (VHF antenna, UHF antenna) are used.

  In addition, as a satellite receiving antenna that receives a satellite broadcast signal distributed using a broadcasting satellite (BS) or a communication satellite (CS) as a relay station, a reflecting mirror and a reflecting mirror via an arm portion extending from the reflecting mirror are used. A parabolic antenna composed of a primary radiator arranged at the focal position is used.

Each of these antennas receives a terrestrial broadcast signal and a satellite broadcast signal, and when each received signal is transmitted to the terminal side via a single coaxial cable, each received signal is mixed by a mixer. However, by incorporating this function as a mixer into the primary radiator of the satellite receiving antenna (specifically, in the down converter that down-converts the received signal from the primary radiator), the cabling is simplified. It has also been proposed (see, for example, Patent Document 1).
JP-A-9-321544

  By the way, in television broadcasting using terrestrial broadcasting, digital broadcasting using UHF band radio waves has been put into practical use separately from conventional analog broadcasting, and now, the service area of terrestrial digital broadcasting is extended from metropolitan areas to rural areas. It is expanding.

  Since the conventional UHF antenna (multi-element antenna described above) can be used for receiving this terrestrial digital broadcast, UHF band analog broadcasts have been received through the UHF antenna so far in each home and facility. If the terrestrial digital broadcast can be received by the UHF antenna, the existing UHF antenna can be used as it is.

  However, it is possible to receive terrestrial digital broadcasts when the terrestrial digital broadcast cannot be received with an existing UHF antenna because the arrival direction of radio waves is different in each home or facility, or when no UHF antenna is installed. In this case, a new UHF antenna must be installed.

  However, a conventional UHF antenna usually includes, in addition to a radiator made of a dipole, a waveguide made of about 10 or more tubular elements spaced apart in front of the radiator, The reflector is composed of a plurality of tubular elements arranged at intervals in the direction substantially perpendicular to the direction of arrangement of the waveguides, and is guided toward the direction of arrival of radio waves when installed. It is necessary to arrange each element so that the waver, the radiator, and the reflector are arranged in order.

For this reason, in order to newly install a conventional UHF antenna for receiving terrestrial digital broadcasting, a large installation place is required. For example, in an apartment house such as an apartment or a condominium, each home receives digital terrestrial broadcasting. Therefore, it is difficult to install a conventional UHF antenna on a veranda or the like.

  The present invention has been made in view of such a problem, and a UHF antenna capable of receiving terrestrial digital broadcasting or the like is configured using a satellite reception antenna that can be easily attached to a veranda or the like, thereby reducing the size of the UHF antenna. The purpose is to promote the spread of digital terrestrial broadcasting.

In order to achieve the above object, the invention according to claim 1 is a satellite having a reflecting mirror and a receiving unit disposed at a focal position of the reflecting mirror through an arm portion extending from the reflecting mirror. A UHF antenna that is used by being fixed to the arm portion of the receiving antenna,
A radiator composed of an antenna element formed in a loop shape and a feeding portion;
An input terminal for capturing a UHF reception signal output from the power feeding unit of the radiator and a satellite reception signal output from the reception unit of the satellite reception antenna, and a mixing circuit for mixing the signals input from the input terminal And an electronic device having an output terminal for outputting the reception signal mixed in the mixing circuit to an external receiving terminal;
The antenna unit is detachably fixed to the arm of the satellite receiving antenna, supports the power feeding unit of the radiator, and the loop of the antenna element is disposed at a position facing the reflecting mirror of the satellite receiving antenna. A fixing part that fixes the antenna element on the opposite side across the arm part of the satellite receiving antenna;
It is provided with.

  According to a second aspect of the present invention, in the UHF antenna according to the first aspect, the electronic device is a power source transmitted from an external receiving terminal side for feeding power to the receiving unit of the satellite receiving antenna. A power passing circuit is provided for passing a signal from the output terminal to an input terminal connected to a receiving unit of the satellite receiving antenna.

  Further, the invention according to claim 3 is the UHF antenna according to claim 1 or 2, wherein the electronic device amplifies the UHF received signal and inputs the amplified signal to the mixing circuit; And a power supply circuit that supplies power to the amplifier circuit using a power supply signal transmitted from the receiving terminal side.

  According to a fourth aspect of the present invention, in the UHF antenna according to any one of the first to third aspects, the antenna element is fixed in a state where the fixed portion is fixed to an arm portion of the satellite receiving antenna. It is characterized in that the radiation direction of the radio wave can be adjusted.

  On the other hand, the invention according to claim 5 is provided with a reflecting mirror and a receiving portion arranged at a focal position of the reflecting mirror via an arm portion extending from the reflecting mirror, and can receive satellite broadcasting. A satellite receiving antenna, wherein the UHF antenna according to any one of claims 1 to 4 is attached to the arm portion.

  According to the UHF antenna of the first aspect, the feeding element is fixed to the arm part of the satellite receiving antenna via the fixing part, so that the loop of the antenna element faces the reflecting mirror of the satellite receiving antenna. Can be arranged.

In this state, since the antenna element is disposed between the reflector of the satellite receiving antenna and the receiving unit, the reflector of the satellite receiving antenna functions as a reflector for the UHF antenna (radiator). The antenna element receives a transmission wave from a UHF broadcast station located in front of the mirror surface of the reflecting mirror and a reflected wave reflected by the transmission wave hitting the reflecting mirror. A signal will be obtained.

  Therefore, according to the UHF antenna of the present invention, a TV broadcast signal can be received by being attached to the arm portion of a satellite receiving antenna installed on a veranda or the like, even though it is a radiator composed of an antenna element and a power feeding portion. It becomes possible to use as a possible UHF antenna, and as a result, the spread of digital terrestrial broadcasting can be promoted.

  The UHF antenna of the present invention takes in the UHF reception signal output from the power feeding unit of the radiator and the satellite reception signal output from the reception unit of the satellite reception antenna via the input terminal, and mixes these signals. After mixing in the circuit, an electronic device that outputs from the output terminal is provided, and the fixing unit can fix the electronic device to the side opposite to the antenna element with the arm portion of the satellite reception antenna interposed therebetween. ing.

  For this reason, according to the UHF antenna of the present invention, the UHF reception signal and the satellite reception signal are mixed by an electronic device fixed to the arm portion of the satellite reception antenna via the fixed portion, and each of these signals is mixed. Thus, the data can be transmitted to a receiving terminal such as a TV tuner via the transmission line.

  For example, in the case where the UHF antenna of the present invention is fixed to an existing satellite receiving antenna, the radiator and the electronic device are fixed to the arm portion of the satellite receiving antenna through the fixing unit, and then the satellite receiving antenna If the existing transmission line (coaxial cable, etc.) connected to the receiver is connected to the output terminal of the electronic device, and the input terminal of the electronic device is connected to the receiver of the satellite receiving antenna via the transmission line The reception signal from the satellite receiving antenna can be transmitted to the terminal side via the existing transmission line, and wiring work for the transmission line to the terminal side can be eliminated.

  Further, in the present invention, since the power feeding unit of the radiator and the electronic device are configured separately, the base unit (that is, the power feeding unit) to which the antenna element is fixed is compared with the case where they are integrated. Can be light and small.

  For this reason, when adjusting the direction of the antenna element, the base part becomes an obstacle, and the adjustable range of the antenna direction is narrowed, or the direction of the antenna element is shifted due to wind hitting the base part. Can be prevented.

  In addition, since the base portion of the antenna element can be lightened, the force required to fix the base portion (that is, the power feeding portion) to the fixing portion after adjusting the direction of the antenna element can be reduced. It is possible to easily fix the radiator) to the fixing portion.

  Further, when the electronic device is an amplifier, when the power feeding unit and the electronic device are integrated, the amplified received signal may oscillate by sneaking into the power feeding unit. However, in the present invention, the power feeding unit and the electronic device Since these are configured separately, such problems can also be prevented.

  By the way, the receiving unit of the satellite receiving antenna is usually provided with a converter that down-converts a reception signal in the tens of GHz band obtained by receiving satellite broadcast radio waves into a reception signal for transmission of 1 to 2 GHz. In addition, a power source signal (DC voltage) for operating this converter may be transmitted from a receiving terminal for satellite broadcasting reception.

  Therefore, as described in claim 2, the power supply signal transmitted from the terminal side to the output terminal via the transmission line is connected to the receiving unit of the satellite receiving antenna from the output terminal. It is preferable to provide a power passage circuit that allows passage to the input terminal.

  In other words, if the electronic device is configured in this way, a power feeding path to the satellite receiving antenna can be formed in the electronic device, and it is not necessary to provide the power feeding path separately. Can be done more easily.

Next, in the UHF antenna according to the third aspect, an amplifier circuit and a power supply circuit are provided in the electronic device.
Therefore, according to this UHF antenna, it becomes possible to amplify the UHF reception signal by using the power signal transmitted from the terminal side in the electronic device, and it is difficult for the UHF broadcast radio wave to reach the signal. It can be used even in areas where the level (electric field strength) is low. Therefore, according to the third aspect of the present invention, the usable range of the UHF antenna of the present invention can be expanded.

  In a UHF antenna according to a fourth aspect of the present invention, the fixed portion is configured to be able to adjust the radiation direction of the radio wave of the antenna element while being fixed to the arm portion of the satellite receiving antenna.

  Therefore, according to this UHF antenna, when viewed from the mirror surface of the reflecting mirror of the satellite receiving antenna, the ground station that transmits the terrestrial broadcast radio wave transmits the broadcast satellite (BS) or communication satellite ( Even in the case of being located in a different direction from CS), the radiation direction of the radio wave of the antenna element can be adjusted to face the ground station.

Next, a satellite reception antenna according to a fifth aspect is provided with the above-described UHF antenna according to the present invention (first to fourth aspects) attached to an arm portion.
Therefore, according to this satellite receiving antenna, a UHF / satellite broadcasting shared receiving antenna can be obtained by using a satellite receiving antenna that has been sold or installed in the past and the UHF antenna of the present invention (claims 1 to 4). Easy to configure.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is an explanatory diagram showing the overall configuration of a UHF / satellite broadcast shared receiving antenna (hereinafter also simply referred to as a receiving antenna) 1 according to an embodiment to which the present invention is applied.

  The receiving antenna 1 of the present embodiment is distributed from a ground station using a satellite broadcast signal distributed from one or both of a broadcast satellite (BS) and a communication satellite (CS) and a UHF band TV broadcast radio wave. Receiving UHF broadcast signals such as digital terrestrial broadcasts and transmitting the received signals to a receiving terminal (not shown) such as a TV tuner using a single transmission line (coaxial cable). The UHF antenna 10 is integrated with a satellite receiving antenna for satellite broadcast reception (in this embodiment, an offset parabolic antenna).

  As shown in FIG. 1, a satellite receiving antenna (that is, an offset parabolic antenna) constituting the receiving antenna 1 is provided on the reflecting mirror 3 and the back surface of the reflecting mirror 3, and the reflecting mirror 3 is attached to a support column 4 or the like. By fixing to the distal end of the arm portion 7, the arm portion 7 extending from the mounting portion 5 to the vicinity of the focal point of the front surface (that is, the reflecting surface) of the reflecting mirror 3. The primary radiator 9 is disposed at the focal position of the reflecting mirror 3 via the arm portion 7 and receives radio waves of satellite broadcast signals collected by the reflecting mirror 3.

  Note that the primary radiator 9 incorporates a converter that down-converts the received signal (tens of GHz) into an intermediate frequency signal of several GHz. The primary radiator 9 receives the down-converted intermediate frequency signal. It is output as a satellite reception signal.

  On the other hand, as shown in FIG. 2, the UHF antenna 10 is configured by a radiator including an antenna element 12 formed in a substantially circular loop shape, and a feeding unit 14 connected to both ends of the antenna element 12. ing. As shown in FIG. 1, the feeding unit 14 of the UHF antenna 10 includes an antenna element 12 positioned between the reflecting mirror 3 and the primary radiator 9, and a loop of the antenna element 12 (specifically, the loop element). The opening surface is fixed to the arm portion 7 via the fixing portion 16 so as to face the reflecting mirror 3.

  In addition, the fixing position of the power feeding unit 14 in the arm unit 7 is such that the radio wave of the satellite broadcast signal reflected by the reflecting mirror 3 passes through the inside of the loop of the antenna element 12 as indicated by a two-dot chain line in FIG. It is set near the tip of the arm portion 7 to which the primary radiator 9 is attached so that it enters the radiator 9 (in other words, the radio wave of the satellite broadcast signal is not blocked by the antenna element 12). ing.

  Next, as shown in FIGS. 2 to 4, the fixing unit 16 includes a fixing unit main body 22 that is directly fixed to the arm unit 7, a mounting table 26 for mounting the power feeding unit 14 of the UHF antenna 10, and a fixing unit 16. A support unit 24 that is integrally formed with the unit main body 22 and rotatably supports the mounting table 26; and a device mounting unit 28 that is extended to the fixed unit main body 22 and for mounting an electronic device 18 such as a booster. , Is composed of.

  2 is a front view showing the state of the UHF antenna 10 and the fixing portion 16 when the receiving antenna 1 is viewed toward the reflecting surface of the reflecting mirror 3, and FIG. 3 is a front view showing the UHF antenna 10 and the fixing portion 16. FIG. 4 is a plan view (a) and a bottom view (b) showing a state in which the UHF antenna 10 and the fixing portion 16 are viewed from above and below.

  Here, first, the fixing portion main body 22 is formed in a rectangular ring shape so that the arm portion 7 can be inserted. Of the four sides forming the rectangular ring, the arm portion 7 is introduced from the outside to the inside of the ring on one side of the ring that becomes the side wall 22b when the fixing portion main body 22 is fixed to the arm portion 7. An opening 22a is formed, and when the fixing portion main body 22 is fixed to the arm portion 7, a screw hole for screwing a fixing screw 32 made of a thumbscrew into the bottom of the lower wall 22c of the ring is formed. Is drilled.

  Therefore, when fixing the fixing portion main body 22 to the arm portion 7, the fixing screw 32 is screwed into the screw hole from the outside of the ring, and the arm portion 7 disposed inside the ring is attached to the fixing screw 32. By pressing with the contact plate 32 a provided at the tip, the fixing portion main body 22 can be firmly fixed to the arm portion 7.

  Further, a support portion 24 is formed on the outer peripheral surface (upper surface) of the ring that becomes the upper wall 22 d when the fixing portion main body 22 is fixed to the arm portion 7. And, when the fixed portion main body 22 is fixed to the arm portion 7, the support portion 24 has an upper wall 22 d that is substantially parallel to a vertical plane along the central axis of the arm portion 7. A pair of side walls 24a and 24b are projected upward.

On the other hand, in the mounting table 26, a plate-like protruding portion 26 a protrudes from a surface (that is, a lower surface) opposite to the mounting surface of the power feeding unit 14. And this protrusion part 26a is fitted between the side walls 24a and 24b which comprise the support part 24. As shown in FIG. That is, the support portion 24 is configured such that the mounting table 26 is attached to the arm portion 7 by fitting a plate-like protrusion 26 a protruding from the lower surface of the mounting table 26 between the pair of side walls 24 a and 24 b. It is comprised so that it can displace along an axial direction.

  Further, the side walls 24a and 24b of the support portion 24 and the protruding portion 26a of the mounting table 26 fitted between the side walls 24a and 24b are provided with screw holes for penetrating these portions in a substantially horizontal direction. It is installed. A bolt portion of an elevation angle adjusting screw 36 made of a wing screw is inserted into the screw hole. The elevation angle adjusting screw 36 tightens between the side walls 24 a and 24 b of the support portion 24 to project the protruding portion of the mounting table 26. 26 a can be fixed at a desired rotation position around the elevation angle adjusting screw 36.

  In other words, in the present embodiment, by using the elevation angle adjusting screw 36, the inclination angle (in other words, the elevation angle of the radiation center axis of the antenna element 12) with respect to the arm portion 7 of the power feeding unit 14 mounted on the mounting table 26 is desired. The angle can be adjusted. The mounting table 26 is configured to be able to rotate about 180 degrees around the elevation angle adjusting screw 36 with the power feeding unit 14 fixed and mounted on the support unit 24.

  Next, both ends of the antenna element 12 are inserted into the inside from a pair of left and right side walls of the power feeding unit 14, and the power feeding unit is located at substantially the center position of the power feeding unit 14 into which both ends of the antenna element 12 are inserted. A through hole penetrating up and down 14 is formed. The mounting table 26 has a screw hole at a position corresponding to the through hole.

  Then, after the power feeding unit 14 is placed on the mounting table 26, an orientation adjusting screw 38 made of a thumbscrew is inserted into the through hole of the power feeding unit 14, and the tip of the orientation adjusting screw 38 is drilled in the mounting table 26. It is fixed on the mounting table 26 by being screwed into the screw hole and tightened.

  Accordingly, when fixing the power supply unit 14 to the mounting table 26, the power supply unit 14 can rotate around the direction adjustment screw 38 until the direction adjustment screw 38 is tightened. By adjusting this, the horizontal direction of the UHF antenna 10 can be arbitrarily set.

  Next, as shown in FIG. 1, the device mounting portion 28 is for fixing the electronic device 18 on the opposite side of the UHF antenna 10 (that is, below the arm portion 7) with the arm portion 7 interposed therebetween. In the fixing portion main body 22, the arm portion 7 is extended from a side wall 22 e where no opening 22 a is formed.

  The electronic device 18 attached to the device attachment unit 28 includes a UHF input terminal Tin1 for inputting a UHF reception signal from the power supply unit 14 of the UHF antenna 10 and a satellite reception antenna in a waterproof case made of synthetic resin. A satellite input terminal Tin2 for inputting a satellite reception signal from the primary radiator 9 which is a receiving unit of the receiver, and an output terminal Tout for outputting a reception signal obtained by mixing these two signals, and further, its waterproof case Inside, an electronic circuit for amplifying the UHF reception signal and mixing and outputting the amplified UHF reception signal and the satellite reception signal is housed.

  And when the waterproof case of the electronic device 18 is mounted on the device mounting portion 28, the wall surface on which the terminals Tin1, Tin2, and Tout are attached faces the lower side so that the wall surface on the opposite side to the wall surface faces. Protrusions 18 a and 18 b for fixing to the device mounting portion 28 are provided in the center, and the electronic device 18 is fixed to the device mounting portion 28 by screwing the protrusions 18 a and 18 b to the device mounting portion 28. Below (in other words, below the arm portion 7).

As described above, the mounting table 26 is configured to be able to rotate approximately 180 degrees around the elevation angle adjusting screw 36 in a state where the power feeding unit 14 is fixed and attached to the support unit 24. As shown in FIG. 3B, when the UHF antenna 10 is stored, the UHF antenna can be stored compactly by folding the antenna element 12 so as to be parallel to the device mounting portion 28 and the electronic device 18.

Next, FIG. 5 is a circuit diagram illustrating a circuit configuration of the electronic device 18.
As shown in FIG. 5, the electronic device 18 includes a low-pass filter (LPF) 42 for selectively capturing only the UHF reception signal received by the UHF antenna 10 from the input signal from the UHF input terminal Tin1. An amplification circuit 44 that amplifies an input signal (UHF reception signal) from the LPF 42, and an automatic gain adjustment circuit that automatically adjusts the gain of the amplification circuit 44 so that the output from the amplification circuit 44 becomes a predetermined target level ( AGC circuit) 46, LPF 48 for guiding the UHF reception signal amplified by the amplifier circuit 44 to the output terminal Tout, and the satellite down-converted by the primary radiator 9 from the input signal from the satellite input terminal Tin2 A high pass filter (HPF) 50 is provided for selectively receiving only the received signal and leading it to the output terminal Tout.

  Note that the cutoff frequency of the LPFs 42 and 48 is set to, for example, 770 MHz, and the cutoff frequency of the HPF 50 is set to, for example, 1 GHz. The AGC circuit 48 is provided with a variable resistor (so-called volume) 46a for setting a target level. The variable resistor 46a is provided in a waterproof case of the electronic device 18 as shown in FIG. It can be operated from the outside through the drilled gain adjusting hole 18c. However, the gain adjusting hole 18 c is normally closed with a waterproof cap 19.

  Next, the electronic device 18 receives a power signal (DC voltage) transmitted from a terminal device such as a digital tuner connected to the output terminal Tout via a coaxial cable as a primary radiator 9 (specifically, an internal converter). In order to prevent the DC voltage from being applied to the amplifier circuit 44 through the LPF 48, a choke coil L connected in parallel to the HPF 50 is provided. , A DC cut capacitor C connected in series is provided between the LPF 48 and the output terminal Tout.

  The electronic device 18 includes a power supply circuit 54 that generates a power supply voltage for operating the amplifier circuit 44 from a power supply signal (DC voltage) transmitted from a terminal device such as a digital tuner to the output terminal Tout, and an output terminal. An LPF 52 for inputting a power signal (DC voltage) from Tout to the power circuit 54 is provided. The LPF 52 is for blocking the passage of the UHF reception signal and allowing only the DC component to pass, and the cut-off frequency is set to a sufficiently lower frequency than the television broadcast signal.

  As described above, the receiving antenna 1 of the present embodiment is provided with the UHF antenna 10 formed of a so-called loop antenna on the arm portion 7 of the offset parabolic antenna, so that the reflecting mirror 3 of the parabolic antenna is reflected by the UHF antenna 10. It is made to use as a vessel.

  For this reason, in order to receive UHF broadcasts such as terrestrial digital broadcasts, the UHF antenna itself can be downsized compared to the case of using a general UHF antenna composed of a radiator, a director and a reflector. As a result, the user-friendliness can be improved.

Further, since the UHF antenna 10 is fixed to the arm unit 7 via the fixing unit 16 so that the radio wave of the satellite broadcast signal passes inside the loop of the antenna element 12, the radio wave of the satellite broadcast signal is transmitted by the UHF antenna 10. Is not blocked, and the primary radiator 9 can satisfactorily receive satellite broadcast signals.

  Furthermore, the fixing portion main body 22 of the fixing portion 16 directly fixed to the arm portion 7 is formed in an annular shape with a part of the side wall opened, and can be detachably fixed to the arm portion 7. The UHF antenna 10 can be attached to an existing parabolic antenna already installed on a veranda or the like by using the fixed portion 16.

  Therefore, the receiving antenna 1 of this embodiment can also be realized by attaching the UHF antenna 10 to such an existing parabolic antenna. For example, in a home or facility where a parabolic antenna is already installed, In the case where a UHF antenna is newly installed for receiving digital broadcasting, it becomes possible to install a UHF antenna for terrestrial digital broadcasting very easily and inexpensively.

  Moreover, since the UHF antenna 10 of this embodiment receives the broadcast radio wave from a UHF broadcasting station by using the reflector 3 as a reflector, the directivity characteristic of the UHF antenna 10 depends on the direction of the reflector 3. As will be determined, in this embodiment, the orientation of the antenna element 12 (the elevation angle and orientation of the radiation center axis) can be adjusted via the elevation angle adjustment screw 36 and the orientation adjustment screw 38. The directivity characteristics of the UHF antenna 10 can be arbitrarily set. Therefore, according to this embodiment, the receivable range by the UHF antenna 10 can be expanded.

  On the other hand, the fixed portion main body 22 of the fixed portion 16 is provided with a device mounting portion 28 for fixing the electronic device 18 on the opposite side of the UHF antenna 10 with the arm portion 7 interposed therebetween. The electronic device 18 is fixed via the device mounting portion 28.

  And since this electronic device 18 can amplify the UHF reception signal and mix and output the UHF reception signal and satellite reception signal after the amplification, in order to transmit these signals to the receiving terminal, There is no need to provide a separate mixer or to install two transmission lines consisting of coaxial cables or the like, and the installation work of the receiving antenna 1 of this embodiment can be simplified.

  Further, the electronic device 18 is provided with a choke coil L as a power passage circuit and a power circuit 54, and outputs a power signal (DC voltage) transmitted from the terminal side to the primary radiator 9 side. The power supply voltage necessary for operating the converter in the primary radiator 9 and driving the amplifier circuit 44 in the electronic device 18 is generated using the power supply signal (DC voltage) transmitted from the terminal side. Can do. Therefore, according to the receiving antenna 1 of the present embodiment, it is not necessary to separately provide a power supply path for supplying power to the converter in the primary radiator 9 and the amplifier circuit 44 in the electronic device 18, and this is also installed. Work can be simplified.

As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various aspect can be taken within the technical scope of this invention.
For example, in the above embodiment, the UHF input terminal Tin1 for inputting the UHF reception signal is attached to the waterproof case of the electronic device 18, and the coaxial cable drawn from the power feeding unit 14 of the UHF antenna 10 is connected to the waterproof case. Although it has been described that a UHF reception signal is input to the electronic device 18 by connecting to the UHF input terminal Tin1, as shown in FIG. 6, the internal circuit of the power feeding unit 14 and the internal circuit of the electronic device 18 are coaxially connected. You may make it connect directly via a cable. And if it does in this way, since it is not necessary to provide UHF input terminal Tin1 in the waterproof case of electronic equipment 18, the number of parts can be decreased and manufacturing cost can be reduced.

  6A is a side view of the modified UHF antenna 10 and the fixed portion 16 as viewed from the right direction, and FIG. 6B is a bottom view of these portions as viewed from below. The coaxial cable directly connecting the power supply unit 14 and the electronic device 18 is provided on the lower surface when the respective units are fixed to the arm unit 7 via the fixing unit 16. This is to prevent rainwater from entering the interior, like the satellite input terminal Tin2 and the output terminal Tout.

  Moreover, although the said embodiment demonstrated as what the protrusions 18a and 18b for mounting the electronic device 18 in the apparatus mounting part 28 were protrudingly provided in the upper surface of the electronic device 18, the electronic device 18 is an apparatus. For example, as shown in FIG. 7, a screw hole for mounting and fixing is provided on the side surface of the waterproof case of the electronic device 18, and the side surface abuts on the device mounting portion 28, as shown in FIG. 7. You may make it stop and fix. 7A is a side view of the modified UHF antenna 10 and the fixed portion 16 as viewed from the right direction, and FIG. 7B is a bottom view of these portions as viewed from below.

  Next, in the above-described embodiment, the UHF reception signal amplification circuit 44 is built in the electronic device 18, and the UHF reception signal and the satellite reception signal amplified by the amplification circuit 44 are received from the electronic device 18. However, in addition to the UHF reception signal amplification circuit 44, a satellite reception signal amplification circuit is provided in the electronic device 18, and these amplification circuits amplify the received signal. A reception signal obtained by mixing the received UHF reception signal and the satellite reception signal may be output. The electronic device 18 may be configured as a mixing circuit that simply mixes and outputs a UHF reception signal and a satellite reception signal.

It is explanatory drawing showing the whole structure of the UHF / satellite-broadcast receiving antenna of embodiment. It is a front view showing the structure of a UHF antenna and a fixing | fixed part. It is a side view showing the structure of a UHF antenna and a fixing | fixed part. It is the top view and bottom view showing the structure of a UHF antenna and a fixing part. It is a circuit diagram showing the circuit structure of an electronic device. It is the side view and bottom view showing the modification of a UHF antenna and a fixing | fixed part. It is the side view and bottom view showing the other modification of a UHF antenna and a fixing | fixed part.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Reception antenna (UHF / satellite broadcasting shared reception antenna), 3 ... Reflector, 5 ... Mounting part, 7 ... Arm part, 9 ... Primary radiator, 10 ... UHF antenna, 12 ... Antenna element, 14 ... Feeding part, DESCRIPTION OF SYMBOLS 16 ... Fixed part, 18 ... Electronic device, 18a ..., 18b ... Projection, 18c ... Gain adjustment hole, 19 ... Waterproof cap, 22 ... Fixed part main body, 22a ... Opening, 22b, 22e ... Side wall, 22c ... Bottom wall 22d ... upper wall, 24 ... support part, 24a, 24b ... side wall, 26 ... mounting table, 26a ... projecting part, 28 ... equipment mounting part, 32 ... fixing screw, 32a ... abutting plate, 36 ... elevation angle adjusting screw, 38 ... Direction adjusting screw, Tin1 ... UHF input terminal, Tin2 ... Satellite input terminal, Tout ... Output terminal, 42, 48, 52 ... LPF (low pass filter), 44 ... Amplifier circuit, 46a ... Variable resistor, 48 ... AGC circuit Automatic gain control circuit), 50 ... HPF (high pass filter), 54 ... power supply circuit, C ... Capacitor, L ... choke coil.

Claims (5)

A UHF antenna used fixed to an arm portion of a satellite receiving antenna having a reflecting mirror and a receiving portion disposed at a focal position of the reflecting mirror via an arm portion extended from the reflecting mirror;
A radiator composed of an antenna element formed in a loop shape and a feeding portion;
An input terminal for capturing a UHF reception signal output from the power feeding unit of the radiator and a satellite reception signal output from the reception unit of the satellite reception antenna, and a mixing circuit for mixing the signals input from the input terminal And an electronic device having an output terminal for outputting the reception signal mixed in the mixing circuit to an external receiving terminal;
The antenna unit is detachably fixed to the arm of the satellite receiving antenna, supports the power feeding unit of the radiator, and the loop of the antenna element is disposed at a position facing the reflecting mirror of the satellite receiving antenna. A fixing part that fixes the antenna element on the opposite side across the arm part of the satellite receiving antenna;
A UHF antenna comprising:   The electronic device has an input terminal connected from the output terminal to the receiving unit of the satellite receiving antenna for a power signal transmitted from an external receiving terminal side for power feeding to the receiving unit of the satellite receiving antenna The UHF antenna according to claim 1, further comprising a power supply passage circuit that passes through the power supply.   The electronic device includes an amplification circuit that amplifies the UHF reception signal and inputs the amplified signal to the mixing circuit, a power supply circuit that supplies power to the amplification circuit using a power supply signal transmitted from the reception terminal side, The UHF antenna according to claim 1, wherein the UHF antenna is provided.   The said fixing | fixed part is comprised in the state fixed to the arm part of the said satellite receiving antenna, It is comprised so that adjustment of the radiation direction of the electromagnetic wave of the said antenna element is possible. The UHF antenna described in 1. A satellite receiving antenna capable of receiving satellite broadcasts, comprising: a reflecting mirror; and a receiving unit disposed at a focal position of the reflecting mirror via an arm portion extending from the reflecting mirror;
A satellite receiving antenna, wherein the UHF antenna according to any one of claims 1 to 4 is attached to the arm portion.

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