CN109743557B - Novel miniaturized KU wave band multiuser DCSS tuner - Google Patents
Novel miniaturized KU wave band multiuser DCSS tuner Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention relates to a novel miniaturized KU wave band multi-user DCSS tuner, which comprises a feed source, a wave guide pipe, a multilayer circuit board, an L-shaped pin needle and an I-shaped pin needle, wherein the L-shaped pin needle and the I-shaped pin needle are connected with the multilayer circuit board; the wave guide pipe is of an excircle hollow structure, the front end of the wave guide pipe is connected with the feed source, and a circuit mounting seat for placing the multilayer circuit board is formed on the outer side of the bottom end of the wave guide pipe; the bottom end of the waveguide tube is internally provided with a rectangular plane, a first ladder, a second ladder and a third ladder are arranged in the waveguide tube, the first ladder and the second ladder are arranged on the same side, and the third ladder is vertical to the first ladder and the second ladder; the L-shaped pin needle is positioned in a first step interval, the I-shaped pin needle is positioned in a second step interval, and the L-shaped pin needle and the I-shaped pin needle are vertical to each other in a space of 90 degrees in the waveguide. The invention cancels the structural design of the isolating rod, simplifies the production process of the product and realizes the miniaturization of the product. In addition, the use of multiple user set top boxes supported on a single coaxial cable is also provided, and the multifunctional selection is provided.
Description
[ field of technology ]
The invention relates to a satellite television receiving technology, in particular to a novel miniaturized KU wave band multi-user DCSS tuner.
[ background Art ]
Currently, human beings transmit signals through satellites very widely, especially in the field of receiving satellite broadcast television signals using a tuner. The KU band frequency range is 10700MHz to 12750MHz, the KU band tuner receives the satellite downlink signal of the KU band, corrects and amplifies the weak video signal, shields the interference signal to ensure the stability of the image, and outputs the intermediate frequency signal of 950-2150MHz to restore the television signal through demodulation.
At present, the signal transmission through 1 cable can only meet the use of 1 user Set Top Box (STB), if service is provided for a plurality of users, the service must be rewired and hardware installed, the operation cost of the tuner is high, and the market competitiveness is low.
The conventional KU band tuner is shown in fig. 1, and comprises a feed source 10, a waveguide 20, a circuit device and a connector, wherein the waveguide 20 is a hollow metal conduit with a smooth inner wall and a circular cross section, and a spacer rod 30 with a polarization isolation function is arranged in the symmetry center of the waveguide 20. The electromagnetic field in the circular waveguide is distributed in standing waves along the circumferential and radial directions, and polarization rotation occurs due to extremely small non-uniformity during transmission, and the isolation rod 30 is traversed through the center of the inner wall of the circular waveguide and between the horizontal polarization probe 40 and the vertical polarization probe 50 due to the axisymmetry of the circular waveguide, so that the polarization signal is relatively stable.
Typically, the spacer 30 is made of an iron nickel plated material to a specific size, and the spacer 30 is pressed inside the circular waveguide 2 times according to a standardized process flow. If the spacer 30 is not provided inside the circular waveguide, electromagnetic waves of horizontal polarization and vertical polarization interfere with each other, i.e., adjacent television signals are mutually strung, and television programs of all channels cannot be received. Such a spacer 30 has resulted in a cumbersome process flow.
In addition, the circuit board in the tuner circuit device is a single-layer double-sided board, and commonly used boards include a ROGERS board (high-frequency ceramic board), an LNB33 board (high-frequency glass-carbon hydrogenated ceramic board), and an FR4 board (glass fiber epoxy resin board), and a board 70 is double-sided copper-clad 60, and the cross section is shown in fig. 2. Typically in a tuner circuit, where the RF amplifying circuit is made of a ROGERS board or an LNB33 board and the IF output circuit is made of an FR4 board, a circuit board assembly splice of multiple boards is often present on the same product. The combined circuit board formed by splicing ensures that the process flow of the product is more complicated, the whole is bigger, the cost is higher, and the miniaturization of the product can not be realized.
In view of the complex process and huge volume of the single user and waveguide circuit board, the inventor provides a brand new tuner technology, which is generated by the scheme.
[ invention ]
In order to solve the problems, the invention aims to provide a novel miniaturized KU wave band multi-user DCSS tuner, which can cancel the structural design of a spacer rod, simplify the production process of a product and realize the miniaturization of the product. In addition, the use of multiple user set top boxes supported on a single coaxial cable is also provided, and the multifunctional selection is provided.
In order to achieve the above purpose, the present invention mainly adopts the following technical scheme:
a novel miniaturized KU band multiuser DCSS tuner comprises a feed source, a wave guide pipe, a multilayer circuit board, an L-shaped pin needle and an I-shaped pin needle which are connected with the multilayer circuit board; the wave guide pipe is of an excircle hollow structure, the front end of the wave guide pipe is connected with the feed source, and a circuit mounting seat for placing the multilayer circuit board is formed at the outer side of the bottom end of the wave guide pipe;
the bottom end of the waveguide tube is closed, the inside of the waveguide tube is a rectangular plane, a first ladder, a second ladder and a third ladder which are symmetrical are arranged on the inner wall of the rectangular plane, the first ladder and the second ladder are arranged on the same side, and the third ladder is vertical to the space between the first ladder and the second ladder; the L-shaped pin needle is provided with a slot on the outer part, the slot is extended into the installation, the horizontal part of the L-shaped pin needle is positioned in a first step interval, the opening on the outer part of the I-shaped pin needle is inserted into the slot and positioned in a second step interval, and the L-shaped pin needle and the I-shaped pin needle in the waveguide tube are vertical to each other at 90 degrees in space.
The first step, the second step and the third step respectively comprise a step surface vertical to the rectangular plane and a step surface parallel to the rectangular plane, and the areas of the first step surface, the second step surface and the third step surface are gradually reduced.
The rectangular plane is provided with a long side and a short side, the first step and the second step of the rectangular plane are formed by extending at the long side, and the third step is arranged at the short side.
The grooves of the L-shaped pin needle are formed in parallel along the short sides of the rectangular plane, and the length of the groove body is not more than 1/2 of the distance of the short sides.
The horizontal part of the L-shaped pin needle is positioned in the area range corresponding to the first step surface.
The length of the I-shaped pin extending into the waveguide tube is not more than 1/2 of the distance of the long side.
The I-type pin needle is positioned in a region range corresponding to the second level.
The I-shaped pin needle is perpendicular to the third step surface.
The multilayer circuit board comprises P pieces, a high-frequency circuit board and a low-frequency circuit board, and is formed by multilayer lamination.
The high-frequency circuit board comprises a first substrate layer which adopts a ROGERS board or an LNB33 board, and copper-clad layers respectively coated on the upper surface and the lower surface of the first substrate layer.
The copper-clad layer covered on the upper surface of the first substrate layer is a top circuit layer, and the copper-clad layer covered on the lower surface of the first substrate layer and bonded with the P piece is a first intermediate circuit.
The low-frequency circuit board comprises a second substrate layer which adopts an FR4 board, and copper-clad layers respectively coated on the upper surface and the lower surface of the second substrate layer.
The copper-clad layer which is covered on the upper surface of the second substrate layer and is adhered to the P piece is a second middle circuit layer, and the copper-clad layer which is covered on the lower surface of the second substrate layer is a bottom circuit layer.
The multilayer board comprises a first wire hole connecting the copper-clad through holes of the top layer circuit layer and the first intermediate circuit, a second wire hole connecting the copper-clad through holes of the top layer circuit layer and the second intermediate circuit layer, a third wire hole connecting the copper-clad through holes of the top layer circuit layer and the bottom layer circuit layer, and a fourth wire hole connecting the copper-clad through holes of the first intermediate circuit and the bottom layer circuit layer.
The multi-layer circuit board comprises an RF amplifying circuit, a band-pass filter, a low-power integrated circuit and a digital signal integrated circuit; the RF amplifying circuit receives the horizontal signal and the vertical signal, outputs the signals through the band-pass filter after being amplified by the RF amplifying circuit, and sends the signals to the low-power integrated circuit for mixing, the low-power integrated circuit is connected to the digital signal integrated circuit, and finally the IF output is connected to the set top box.
The digital signal integrated circuit is a full-band capturing satellite signal adder, and the internal structure comprises a radio frequency input end, a digital channel cross switch, 32 channels, a channel adder and an intermediate frequency output end which are connected in sequence.
The radio frequency input end receives signals output by the low-power integrated circuit, and simultaneously carries out analog-digital conversion and automatic gain control on the signals so as to realize the optimal effect after the analog-digital conversion of the signals and transmit the signals to the digital channel cross switch.
The digital channel cross-bar switch is used for mapping any frequency of any digital signal in the input to any one of 32 channels.
The 32 channels are digitally selected and filtered by a programmable program and independently fed to a signal adder.
The signal superimposer is used to select 32 transponders from any radio frequency input, convert them to selected frequencies within 950-2150MHz by a digital frequency synthesizer, and ensure that any combination is separated from the output.
The intermediate frequency output end is a signal output by the receiving signal superposition device and uses a digital-to-analog converter to convert and output 950-2150MHz intermediate frequency signal.
The digital signal integrated circuit adopts BCM4554 integrated circuit of Botong company.
The output of the digital signal integrated circuit is connected with the triplexer and then connected with the output of the intermediate frequency amplifying circuit.
The band-pass filter circuit is also connected with a low-current integrated tuning circuit to form an analog output.
Compared with the prior art, the invention has the following beneficial effects:
1. the multilayer circuit board adopted by the invention has more stable dielectric property than a single board in the prior industry, can meet the requirements of multilayer circuits and integrated circuit design, lays a solid foundation for product upgrading miniaturization and digital integration, and meets the market demands of low cost and high quality for the first time.
2. The waveguide tube adopts a square-round waveguide converter technology, the bottom of the waveguide tube is designed into a rectangular plane, and is matched with three steps to convert a circular cavity into a rectangular cavity, no isolating rod exists, and the opening end is circular. The L-shaped pin needle groove body is slotted along the center line of the wide wall surface of the rectangular cavity, and the slot is formed along the center line of the wide wall surface, so that the slot along the center line of the wide wall surface can not influence the internal field energy distribution due to cutting off the current of the pipe wall, the slot opening can not radiate electromagnetic wave energy outwards to distort signals, only longitudinal current signals can be received by a horizontal polarization probe, the mutual interference of signals of horizontal polarization and vertical polarization is avoided, and the technical problem that no isolation rod is used for overcoming the interference of polarized signals is already realized.
3. The invention adopts the digital channel superposition technology of the digital signal integrated circuit and the optimized circuit design, is realized on a single coaxial cable, and can support the use of a plurality of (16-32) user Set Top Boxes (STB). The multifunctional circuit design concept is also provided, and the multifunctional circuit design concept has two functions of outputting analog signals and digital signals, meets the requirements of 91 multiple users, and supports MoCA and high-definition video reception.
[ description of the drawings ]
FIG. 1 is a schematic diagram of a prior art tuner;
fig. 2 is a structural view of a circuit board employed in a conventional tuner;
FIG. 3 is a schematic perspective view of a preferred embodiment of the present invention;
FIG. 4 is a cross-sectional view taken along the direction A-A of FIG. 3;
FIG. 5 is a B-B sectional view of FIG. 3;
FIG. 6 is a schematic perspective view of FIG. 5;
FIG. 7 is a schematic plan view of a probe mount according to a preferred embodiment of the present invention;
FIG. 8 is a schematic view of the interior of the probe mount according to the preferred embodiment of the present invention;
FIG. 9 is a schematic cross-sectional view of a multilayer circuit board according to a preferred embodiment of the present invention;
FIG. 10 is a schematic view of a multi-layer circuit board according to a preferred embodiment of the present invention;
FIG. 11 is a schematic diagram of a circuit module according to a preferred embodiment of the present invention;
FIG. 12 is a schematic diagram of a digital signal integrated circuit according to a preferred embodiment of the invention;
FIG. 13 is a schematic diagram of another circuit module according to the preferred embodiment of the invention;
FIG. 14 is a schematic diagram of a triplexer circuit according to a preferred embodiment of the invention.
[ detailed description ] of the invention
The present invention will be described in further detail with reference to the accompanying drawings 3-14.
A novel miniaturized KU wave band multiuser DCSS tuner mainly relates to components including a feed source 1, a wave guide pipe 2, an L-shaped pin needle 3, an I-shaped pin needle 4 and a multilayer circuit board 5. One end of the waveguide 2 is connected with a feed source 1, and the feed source 1 is a conventional technology and will not be described here. The other end outer wall of the waveguide 2 forms a circuit mount 51 in which the multilayer circuit board 5 is mounted and fixed. The L-shaped pin needle 3 and the I-shaped pin needle 4 are connected and fixed with the multilayer circuit board 5.
One innovation of the invention is that the wave guide tube 2 is of a closed structure, a rectangular plane 21 is formed inside, the rectangular plane 21 is provided with long sides and short sides, a first step 22 and a second step 23 are formed on two sides of the inner wall of the wave guide tube 2 along the positions of the two long sides, a third step 24 is formed on two sides of the inner wall of the wave guide tube 2 along the positions of the two short sides, and the first step 22, the second step 23 and the third step 24 are in a space vertical state. The first step 22 comprises a first step surface 221 and a first step surface 222, the second step 23 comprises a second step surface 231 and a second step surface 232, the third step 24 comprises a third step surface 241 and a third step surface 242, the first step surface 221, the second step surface 231 and the third step surface 241 are all perpendicular to the rectangular plane 21, the first step surface 222, the second step surface 232 and the third step surface 242 are all parallel to the rectangular plane 21, and the first step surface 222, the second step surface 232 and the third step surface 242 sequentially decrease in area step by step.
The outer wall of the waveguide tube 2 is provided with a circuit board seat 51 near the bottom end, the L-shaped pin needle 3 and the I-shaped pin needle 4 are connected to the multilayer circuit board 5, and the L-shaped pin needle and the I-shaped pin needle penetrate into the waveguide tube 2 through a circuit board mounting position 8. The L-shaped pin needle 3 is inserted through a slot, and the I-shaped pin needle 4 is inserted through a hole.
The specific position of the L-shaped pin needle 3 is grooved in parallel along the short side of the rectangular plane 21 at the bottom end of the waveguide tube 2, the groove body is not more than the 1/2 position line of the rectangular plane 21, the L-shaped pin needle 3 comprises a vertical part 31 and a horizontal part 32, the outer end of the vertical part 31 is hung and fixed on a circuit board seat 51, the horizontal part 32 extends into the waveguide tube 2, and the length is not more than the 1/2 position line of the rectangular plane 21. The groove is open in the area of the first tread 221, depending on the area of the position where the L-pin needle 3 does not exceed the first tread 221.
The opening of the I-pin needle 4 is perpendicular to the third tread 241 and is in the area of space covered by the second tread 231. The length of the I-pin needle 4 inside the waveguide 2 is not more than 1/2 of the long side of the rectangular plane 21. In this way, the L-shaped pin needle 3 and the I-shaped pin needle 4 are formed vertically with a space of 90 ° inside the waveguide 2.
The working principle of the tuner of the invention is as follows: a section of polarized waveguide signal received by a feed source 1 of a reflecting surface antenna is separated into horizontal (V) signals and vertical (H) signals through a dual-polarized waveguide tube, the isolation value reaches more than 20dB, so that two sets of different signals are transmitted in the same frequency band to mutually influence interference, then the horizontal (V) radio frequency signals and the vertical (H) radio frequency signals are respectively received through an induction pin needle with a phase difference of 90 degrees, amplified and mixed, amplified and obtained satellite television signals needed by users are respectively output through a single-channel or multi-channel connector.
The bottom of the waveguide tube 2 is changed into a rectangular cavity, so that the mutual interference of signals of horizontal polarization and vertical polarization can be avoided, and the technical problem that no isolation rod overcomes the interference of polarized signals is realized.
The multilayer circuit board 5, see fig. 9-10, mainly includes a P-sheet 52, a high-frequency circuit board 53, and a low-frequency circuit board 54.
The P sheet 52 is an isolation layer, and has a thickness generally in the range of 0.08-0.12mm, and is usually 0.1mm, and the material can be selected from PP resin materials, and in this embodiment, the S1000B is selected from the group consisting of raw materials. The P-sheet 52 is used to isolate signals, prevent signal interference between the upper and lower plates, and also serve to bond the upper and lower plates together.
Above the P-plate 52 is a high-frequency wiring board 53, and the high-frequency wiring board 53 includes, in order from top to bottom, a top wiring layer 531, a first base material layer 532, and a first intermediate wiring layer 533. The top circuit layer 531 is mainly made up of copper foil by etching, and is used for routing, grounding, etc. The first substrate layer 532 may be a substrate of a ROGERS board (high frequency ceramic board) or a beneficial LNB33 board capable of meeting the requirement of the high frequency band, and the first intermediate circuit layer 533 is also formed by copper foil etching, and contacts the P-chip 52 for grounding and routing. The thickness of the first substrate layer 532 is 500-520um, and the thicknesses of the top circuit layer 531 and the first middle circuit layer 533 are 17.5um.
Below the P-chip 52 is a low frequency circuit board 54, which is a second intermediate wiring layer 541, a second base material layer 542, and a bottom wiring layer 543 in this order from top to bottom. The second intermediate wiring layer 541 and the bottom wiring layer 33 are also copper foil etched compositions for grounding and routing. The second base material layer 542 is a substrate of an FR4 board (glass fiber epoxy board), and since this layer does not pass through a signal line in a high frequency band, a board capable of meeting the requirement of the high frequency band is not required, and an FR4 board may be used.
Wherein the second substrate layer 542 has a thickness of 160-170um, and the second intermediate wiring layer 541 and the bottom wiring layer 543 have a thickness of 17.5um.
In order to achieve the performance of the manufactured product, the circuits for passing the radio frequency signals of the KU wave band are all arranged on the top circuit layer 531 of the high frequency circuit board 53, and the low frequency circuit board 54 is only connected with the DC circuit and the ground. And the top wiring layer 531 and the first intermediate wiring layer 533 in contact with the P-plate 52 are connected by copper-clad vias to form a first wiring hole 55. The top wiring layer 531 and the second intermediate wiring layer 541 in contact with the P-sheet 52 are connected by copper-clad vias, forming the second wiring holes 56. The top layer 531 and bottom layer 543 are connected by copper-clad vias to form the third line hole 57. The first intermediate wiring layer 533 and the underlying wiring layer 543, which are in contact with the P-plate, are connected by copper-clad vias, forming a fourth wiring hole 58. The connection can better ensure that the product signal is not interfered, and the performance can be better.
The multi-layer circuit board 5 laminates boards of different materials into a whole board, which meets the high-frequency requirement, and can be a low-cost board without any influence on the product characteristics. The original parallel splicing structure of different boards is converted into a laminated structure, so that the circuit connection mode among different boards is simplified, the area of a circuit board can be greatly reduced, and the product miniaturization is facilitated to be widely applied and popularized.
Referring again to fig. 11-14, the circuitry on the multilayer circuit board 5 includes an RF amplifying circuit 61, a band pass filter 62, a low power integrated circuit 63, a digital signal integrated circuit 64.
The RF amplifying circuit 61 receives the horizontal signal and the vertical signal, amplifies the signals by the RF amplifying circuit, sends the amplified signals to the low power integrated circuit 63 through the band-pass filter 62, mixes the radio frequency signal output by the band-pass filter with the local oscillator of the low power integrated circuit 63, outputs the 250-2350 MHz signal, connects the low power integrated circuit 63 to the digital signal integrated circuit 64, and finally connects the IF (intermediate frequency signal) output to the set top box 65. While the operating voltage of the RF amplifying circuit 61 is controlled by the low power integrated circuit 63.
The digital signal integrated circuit in this embodiment adopts BCM4554 integrated circuit of the botong company, and is a full-band captured satellite signal adder. The invention is designed and used, and the inside mainly comprises the following modules: a radio frequency input 641, a digital channel crossbar 642, 32 channels 643, a channel adder 644, an intermediate frequency output 645.
The rf input 641 receives the signal from the low power integrated circuit 63, and performs analog-to-digital conversion and automatic gain control on the digital signal to achieve the optimal effect after analog-to-digital conversion of the signal, and sends the signal to the digital channel crossbar 642. The digital channel crossbar 642 is any means for frequency mapping any of the digitized signals in the input to any of the 32 channels 643, without limitation. The 32 channels 643 are digitally selected and filtered by a programmable program and independently fed to the signal adder 644. The signal adder 644 is for selecting 32 transponders from any radio frequency input, converting them to selected frequencies within 950-2150MHz by a digital frequency synthesizer, and ensuring that any combination is separated from the output. Intermediate frequency output 645 is the signal output by receive signal adder 644 and converts the intermediate frequency signal output 950-2150MHz using a digital-to-analog converter. The output is connected to a set top box 65.
In this embodiment, a digital channel superposition technology is applied, all signals received from satellites are converted into intermediate frequency signals (IF) through a high-speed ADC (analog-to-digital) converter and a DAC (digital-to-analog) converter and output to a user set-top box (STB), demodulation is controlled through an all-digital circuit, and an operating mode (i.e., dynamic or static) can be reset through a programmer, the dynamic mode supports the requirement that 16-32 users simultaneously receive satellite signals, the static mode supports unlimited users, provides completely flexible channel selection, supports more set-top boxes, and has wide single-wire application.
Referring to fig. 13 and 14, in addition to fig. 11 and 12, after the output of the digital signal integrated circuit 64, a triplexer 66 is connected, and after the output of the intermediate frequency amplifying circuit 67, the intermediate frequency signal is output. At the same time, the bandpass filter circuit 62 is further connected to a low-current integrated tuning circuit 68, forming an analog signal output.
Triplexer 66, shown in fig. 14, internally employs an LC circuit configuration to convert an input signal into three identical output signals. The low-current integrated tuning circuit 68 mixes the radio frequency signal output by the band-pass filter with a local oscillator of the low-current integrated tuning circuit 68, and outputs 950-2150MHz intermediate frequency signal.
Therefore, in the embodiment, there may be one analog signal output or (another) multiple digital signal outputs, and on the basis of the above 32 users, the multiple functions of simultaneously receiving satellite signals by 90 users are further satisfied.
The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention, but any modifications, equivalent substitutions, improvements, etc. within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (7)
1. A novel miniaturized KU wave band multiuser DCSS tuner is characterized in that: the device comprises a feed source, a wave guide pipe, a multilayer circuit board, an L-shaped pin needle and an I-shaped pin needle, wherein the L-shaped pin needle and the I-shaped pin needle are connected with the multilayer circuit board; the wave guide pipe is of an excircle hollow structure, the front end of the wave guide pipe is connected with the feed source, and a circuit mounting seat for placing the multilayer circuit board is formed at the outer side of the bottom end of the wave guide pipe;
the bottom end of the waveguide tube is closed, the inside of the waveguide tube is a rectangular plane, a first ladder, a second ladder and a third ladder which are symmetrical are arranged on the inner wall of the rectangular plane, the first ladder and the second ladder are arranged on the same side, and the third ladder is vertical to the space between the first ladder and the second ladder; the outer slot of the L-shaped pin needle extends into the installation, the horizontal part of the L-shaped pin needle is positioned in a first step interval, the outer opening of the I-shaped pin needle is inserted into the slot and positioned in a second step interval, and the L-shaped pin needle and the I-shaped pin needle in the waveguide tube are vertical to each other at a space of 90 degrees;
the first step, the second step and the third step respectively comprise a step surface vertical to the rectangular plane and a step surface parallel to the rectangular plane, and the areas of the first step surface, the second step surface and the third step surface are gradually reduced; the rectangular plane is provided with a long side and a short side, a first step and a second step of the rectangular plane are formed by extending at the long side, and a third step is arranged at the short side;
the grooves of the L-shaped pin needle are formed in parallel along the short sides of the rectangular plane, and the length of the groove body is not more than 1/2 of the distance of the short sides; the horizontal part of the L-shaped pin needle is positioned in a region range corresponding to the first step surface;
the length of the I-shaped pin extending into the waveguide pipe is not more than 1/2 of the distance of the long side; the I-type pin needle is positioned in a region range corresponding to the second level; the I-shaped pin needle is perpendicular to the third step surface.
2. The novel miniaturized KU-band multi-user DCSS tuner of claim 1, wherein: the multilayer circuit board comprises P pieces, a high-frequency circuit board and a low-frequency circuit board, and is formed by multilayer lamination.
3. The novel miniaturized KU-band multi-user DCSS tuner of claim 1, wherein: the high-frequency circuit board comprises a first substrate layer which adopts a ROGERS board or an LNB33 board, and copper-clad layers which are respectively coated on the upper surface and the lower surface of the first substrate layer; the copper-clad layer on the upper surface of the first substrate layer is a top circuit layer, and the copper-clad layer which is covered on the lower surface of the first substrate layer and is adhered to the P piece is a first intermediate circuit; the low-frequency circuit board comprises a second substrate layer which adopts an FR4 board, and copper-clad layers respectively coated on the upper surface and the lower surface of the second substrate layer; the copper-clad layer which is adhered to the P piece on the upper surface of the second substrate layer is a second middle circuit layer, and the copper-clad layer which is covered on the lower surface of the second substrate layer is a bottom circuit layer.
4. The novel miniaturized KU-band multi-user DCSS tuner of claim 1, wherein: the multilayer board comprises a first wire hole connecting the copper-clad through holes of the top layer circuit layer and the first intermediate circuit, a second wire hole connecting the copper-clad through holes of the top layer circuit layer and the second intermediate circuit layer, a third wire hole connecting the copper-clad through holes of the top layer circuit layer and the bottom layer circuit layer, and a fourth wire hole connecting the copper-clad through holes of the first intermediate circuit and the bottom layer circuit layer.
5. The novel miniaturized KU-band multi-user DCSS tuner of claim 1, wherein: the multi-layer circuit board comprises an RF amplifying circuit, a band-pass filter, a low-power integrated circuit and a digital signal integrated circuit; the RF amplifying circuit receives the horizontal signal and the vertical signal, outputs the signal through the band-pass filter after the signal is amplified by the RF amplifying circuit, and sends the signal to the low-power integrated circuit for mixing, the low-power integrated circuit is connected to the digital signal integrated circuit, and finally the IF output is connected to the set top box; the digital signal integrated circuit is a full-band capturing satellite signal adder, and the internal structure comprises a radio frequency input end, a digital channel cross switch, 32 channels, a channel adder and an intermediate frequency output end which are connected in sequence.
6. The novel miniaturized KU-band multi-user DCSS tuner of claim 5, wherein: the radio frequency input end receives signals output by the low-power integrated circuit, and simultaneously carries out analog-to-digital conversion and automatic gain control on the signals so as to realize the optimal effect after the analog-to-digital conversion of the signals and convey the signals to the digital channel cross switch;
the digital channel cross switch maps any frequency of any digital signal in the input to any channel in 32 channels;
the 32 channels are used for digitally selecting and filtering the input signals through a programmable program and independently transmitting the signals to a signal adder;
the signal adder is used for selecting 32 transponders from any radio frequency input, converting the transponders into selected frequencies in 950-2150MHz through a digital frequency synthesizer, and ensuring that any combination is separated from output;
the intermediate frequency output end is a signal output by the receiving signal superposition device and converts and outputs an intermediate frequency signal of 950-2150MHz by using a digital-to-analog converter;
7. a novel miniaturized KU-band multi-user DCSS tuner as claimed in claim 5 or 6, wherein: the output of the digital signal integrated circuit is connected with a triplexer and then connected with the output of the intermediate frequency amplifying circuit; the band-pass filter circuit is also connected with a low-current integrated tuning circuit to form an analog output.
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| CN111047993A (en) * | 2019-12-27 | 2020-04-21 | 吕文伟 | Bendable transparent LED display screen and processing method |
| CN113114961A (en) * | 2021-04-08 | 2021-07-13 | 珠海佳讯创新科技股份有限公司 | High-frequency tuner based on cable transmission and distribution digital satellite signal technology |
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