CN104393383A - Broad tuning coaxial electrically tunable filter and debugging method thereof - Google Patents
Broad tuning coaxial electrically tunable filter and debugging method thereof Download PDFInfo
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Abstract
The invention discloses a broad tuning coaxial electrically tunable filter and a debugging method thereof, and relates to the technical field of microwave communication. The electrically tunable filter comprises a driving circuit, a stepping motor, a transmission mechanism and a filter part, wherein the filter part is provided with two coupling seats, a plurality of resonant cavities and a plurality of intercavity coupling structures; the coupling seats are fixedly equipped with trapezoidal coupling loops; adjustable frequency compensation devices are arranged on outer conductors of the resonant cavities; the intercavity coupling structures are metal plates with two or more circular holes or polygonal holes. The debugging method can allow the electrically tunable filter to reach a tuning range above an octave and have constant band width, stable amplitude frequency and echoing characteristics, improves product debugging efficiency and lowers manufacture and debugging costs.
Description
Technical field
The present invention relates to a kind of coaxial electrical tunable filter and adjustment method thereof, especially a kind of broad tuning coaxial electrical tunable filter and adjustment method thereof, belong to the art of microwave filters field in the communications field.
Background technology
Prior art Patent number is that the Chinese utility model patent of No. CN201220549062.4 discloses " a kind of UHF waveband miniaturized electric regulating duplexer ", the patent No. is that the Chinese utility model patent of CN200920103975.1 discloses " a kind of low noise electrically tunable filter ", the coupled structure adopted is the single coupling aperture form of right-angled trapezium or rectangle respectively, wider frequency range can be covered, but when broadband signal, be difficult to realize in the tuning range of wider octave, all keep constant bandwidth, good amplitude-frequency and echoing characteristics.
" Sichuan Light Chemical Engineering College's journal " the 3rd phase article " developments of four chamber coaxial tunning microwave filters " in 1997 in prior art, form described in article, between chamber, coupling adopts single rectangular opening, input and output excitation adopts leg-of-mutton coupling loop, be suitable for medium tuning range or narrower bandwidth of operation, and when broadband signal and wider tuning range, not easily reach the amplitude-frequency response that constant bandwidth sum is constant, secondly, described in article only first, respectively add a fixing trapezoidal sheet metal in 4 two resonator and do reactance compensation structure, though certain amplitude-frequency characteristic can be improved, but design, processing and debugging do not have flexibility, also not easily in wide frequency ranges, good response curve is had.
Summary of the invention
For deficiency of the prior art, the invention provides a kind of broad tuning coaxial electrical tunable filter and adjustment method thereof.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
Technical scheme one:
A kind of broad tuning coaxial electrical tunable filter, comprises drive circuit, the stepping motor controlled by drive circuit, transmission mechanism, support, shaft coupling, outer cover and filter main body; Described drive circuit comprises pin-saving chip, installs on the bracket; Described transmission mechanism comprises a screw rod, guide plate, a two or more guide rod, and described screw rod is parallel with described guide rod, vertical with guide plate respectively and be connected; Described filter main body inside is provided with two or more resonant cavity and one with coupled structure between epicoele; Inner wire and moveable tuning plug is provided with in described resonant cavity; Described inner wire is metal hollow pipe, and one end is fixedly connected with described resonant cavity, and cyclic spring comb is arranged at pipe other end top; In described transmission mechanism, guide plate connects one end of described tuning plug, the other end of described tuning plug through the center of described inner wire, and with the cyclic spring comb conductive contact of described inner wire port; Described filter main body roof is provided with two dismountable coupling seats with radio frequency interface, described each coupling seat comprises trapezoidal coupling loop, between described chamber, coupled structure is the metallic plate being provided with two or more holes, and the outer wall of described each resonant cavity is provided with frequency compensation device.
The hole between described chamber, coupled structure arranged is circular port, rectangular opening or polygonal hole.
The hole between described chamber, coupled structure arranged is three disjunct rectangular openings, along the directional spreding of described tuning plug movement.
Described frequency compensation device is made up of more than one set screws component and screw hole with matching; Described set screws component comprises adjusts coupling screw and nut, and described set screws component is arranged in a row above along the direction of tuning plug movement, and the degree of depth that described tune coupling screw gos deep in described resonant cavity can regulate.
Described coupling seat is made up of radio frequency interface, coupling plate, coupling loop, described radio frequency interface is fixedly mounted on coupling plate one end, described coupling loop is a wires, the two ends of line are welded with the other end of described radio frequency interface inner core and described coupling plate respectively, and coupling loop and coupling plate form closed right-angled trapezium ring.
Described resonant cavity number is even number, is preferably four.
Described stepping motor is installed on the bracket, be connected with screw rod in described transmission mechanism by described shaft coupling, be provided with upper limit position switch in the junction of described transmission mechanism and described support, be provided with lower position switch in the junction of described transmission mechanism and described filter main body.
Filter roof is provided with dismountable coupling seat, coupling seat adopts radio frequency interface and coupling plate assembling, and welding has the right-angled trapezium coupling loop of compensating for coupling, replace directly being assemblied in prior art radio frequency interface on filter cavity outer wall and triangle or rectangular coupling hoops, not only coupling seat can make frock batch operation, flexible assembling, be easy to debugging, and right-angled trapezium coupling loop makes filter input and output be activated at high low side frequency couple balance, more easily realizes stable filter characteristic; In design, coupled structure between chamber is adopted to be the metallic plate being provided with two or more holes, replace coupling aperture single in prior art, solve the tuning range in octave, the bandwidth of the high, normal, basic frequency range of filter of prior art design changes problem that is violent, amplitude-frequency characteristic severe exacerbation; In design, each resonant cavity outer wall of filter is equipped with frequency compensation device, adopt the above multiple set screws component of row and screw hole, to replace in prior art only in the first, the 4 two resonator each welding add a fixing trapezoidal sheet metal and do reactance compensation structure, the most frequency compensation between exocoel and inner chamber of flexible realization filter in wider frequency range, debud mode is simple, improve design and debugging efficiency, the electrically tunable filter determining wide tunable range in debugging has omnidistance stable amplitude-frequency characteristic.
Technical scheme two:
An adjustment method for broad tuning coaxial electrical tunable filter, with the pass-band performance of network analyzer debugging filter, this adjustment method comprises the following steps:
A) two ports of network analyzer connect the radio frequency interface of tested electrically tunable filter respectively;
B) manual rotation stepping motor, judges whether amplitude frequency curve that network analyzer occurs and echoing characteristics curve meet the demands, and with reference to amplitude-frequency and echo curve adjustment tuning plug and frequency compensation device, the pass-band performance to filter reaches requirement;
C) will load the computer of testing software and DC power supply access debug system, computer continuous control stepping motor rotates, and makes to take exercises in the upper limit position switch of electrically tunable filter in transmission mechanism and lower position switch limited field break-in;
D) computer N continuous time automatically controlled adjustment electrically tunable filter, read the centre frequency of the filter passband amplitude frequency curve on network analyzer, record calibration data each time, described calibration data comprise stepping motor rotate umber of pulse and network analyzer on show corresponding centre frequency, N number of calibration data form one group of calibration array, and wherein N is greater than 20;
E) take a sample test calibration array in be no less than 5 calibration data, check filter main body frequency repeatability and accuracy whether meet the demands, if can not meet the demands, turn to step F); If can meet the demands, turn to step G);
F) repair transmission mechanism, return steps A) again debug;
G) use programmable device by the calibration array of this cover electrically tunable filter in computer write pin-saving chip, and insert in the drive circuit of electrically tunable filter, connect the connecting line of drive circuit and stepping motor, debugging terminates.
Further, described B) comprise following concrete steps:
B1) manual rotation stepping motor, during amplitude frequency curve when network analyzer occurring highest frequency Fmax, with reference to amplitude-frequency and echo curve adjustment tuning plug, the pass-band performance to filter reaches requirement;
B2) be manually rotated counterclockwise stepping motor, from highest frequency Fmax, to centre frequency, change the operating frequency of filter from high to low, the amplitude-frequency characteristic of each frequency of Continuous Observation, judge whether filter meets passband amplitude-frequency characteristic; Described centre frequency is the half of highest frequency Fmax and low-limit frequency Fmin sum; If when can not meet passband amplitude-frequency characteristic, turn to step B3); If can meet the demands, turn to step B4);
B3) finely tune tuning plug to meet the demands to filter bandpass characteristics; Turn to step B2);
B4) manually stepping motor is rotated counterclockwise, change the operating frequency of filter from high to low, the amplitude-frequency characteristic of each frequency of Continuous Observation, from described center frequency points, until low-limit frequency Fmin, with reference to network analyzer display, at frequency compensation device place, add set screws component successively, adjustment adjusts coupling screw to stretch into the length of resonant cavity, until meet filter characteristic requirement; Turn to step B5);
B5) from low-limit frequency Fmin until highest frequency Fmax, manually turn clockwise stepping motor, and the amplitude-frequency characteristic of Continuous Observation filter on network analyzer and echoing characteristics, judge whether to meet filter specifications, if so, step B6 is turned to); If can not meet the demands, turn to step B1);
B6) nut of each set screws component is tightened.
Owing to have employed technique scheme, beneficial effect of the present invention is:
1. filter of the present invention have employed and be provided with two or more circular hole or polygonal hole in coupled structure, break through the mentality of designing of single hole coupling, make to have operating frequency compared with the filter of Long travel when senior middle school's low side frequency shift, the demand of the coupling coefficient fitting theory value between each resonant cavity, optimize the relation of frequency and bandwidth, can both constant bandwidth of operation be had in very wide frequency range.
2. filter of the present invention arranges adjustable frequency compensation device on the outer wall of resonant cavity, adopt set screws component and screw hole as micro-compensation of simultaneous tuning during each resonant cavity height low side frequency change, situation as required, adjustment adjusts coupling screw to stretch into the degree of depth of cavity, very flexible and practical, make, in electrically tunable filter full frequency band, all there is good amplitude-frequency characteristic.
3. the input of filter of the present invention, the mode of output drive employing coupling seat welding right-angled trapezium coupling loop, make the energy complement of electrically tunable filter high low side frequency couple excitation in wide tunable range, realize in the frequency tuning range of ultra-wide, guarantee amplitude-frequency, echoing characteristics all have good state.
4. the present invention adopts dismountable coupling seat, suitable for making frock, and debugging is simple; Dismountable I-shaped coupling plate not only welds flexibly, and is easy to the frequency compensation device realizing peak efficiency on resonator outer wall; On the other hand, frequency compensation setting position is flexible, and size is adjustable, and therefore changes in prior art the processing mode being confined to copper coin welding; Global design drawing simply, very easily realizes, and simplifies machine-building process and means, reduces costs, and is applicable to batch production.
5. adjustment method of the present invention, different debug strategies is adopted as required, to adjust tuning plug respectively or to add the method adjusting coupling screw, Optimization Debugging method in different phase, realizing the optimum each frequency of full frequency band is best filter passband characteristic, improves debugging efficiency.
Accompanying drawing explanation
Fig. 1 is the front schematic view of electrically tunable filter of the present invention;
Fig. 2 is the side sectional view of electrically tunable filter of the present invention;
Fig. 3 is the schematic rear view of electrically tunable filter of the present invention;
Fig. 4 is the flow chart of the adjustment method of electrically tunable filter of the present invention.
Wherein 1-drive circuit, 2-stepping motor, 3-transmission mechanism, 4-filter main body, 5-coupling seat, 6-resonant cavity, coupled structure between 7-chamber, 8-inner wire, 9-tuning plug, 10-frequency compensation device, 11-radio frequency interface, 12-coupling plate, 13-coupling loop, 14-upper limit position switch, 15-lower position switch, 16-adjusts coupling screw, 17-pin-saving chip, 18-support, 19-shaft coupling, 20-U shape outer cover, 21-screw rod, 22-guide plate, 23-guide rod.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further details:
Embodiment 1:
A kind of broad tuning coaxial electrical tunable filter, comprises drive circuit 1, the stepping motor 2 controlled by drive circuit 1, transmission mechanism 3, support 18, shaft coupling 19, outer cover 20 and filter main body 4; Described drive circuit 1 comprises pin-saving chip 17, is arranged on described support 18; Described transmission mechanism 3 comprises a screw rod 21, guide plate 22, a two or more guide rod 23, and described screw rod 21 is parallel with described guide rod 23, vertical with guide plate 22 respectively and be connected; Described filter main body 4 inside is provided with two or more resonant cavity 6 and one with coupled structure between epicoele 7; Inner wire 8 and moveable tuning plug 9 is provided with in described resonant cavity 6; Described inner wire 8 is metal hollow pipes, and one end is fixedly connected with described resonant cavity 6, and cyclic spring comb is arranged at pipe other end top; In described transmission mechanism 3, guide plate 22 connects one end of described tuning plug 9, the other end of described tuning plug 9 through the center of described inner wire 8, and with the cyclic spring comb conductive contact of described inner wire 8 port; It is characterized in that: described filter main body 4 roof is provided with two dismountable coupling seats 5 with radio frequency interface 11, described each coupling seat 5 comprises trapezoidal coupling loop 13, between described chamber, coupled structure 7 is for being provided with the metallic plate in two or more holes, and the outer wall of described each resonant cavity 6 is provided with frequency compensation device 10.
The hole between described chamber, coupled structure 7 arranged is circular port, rectangular opening or polygonal hole.
The hole between described chamber, coupled structure 7 arranged is three disjunct rectangular openings, along the directional spreding of described tuning plug 9 movement.
Described frequency compensation device 10 is made up of more than one set screws component and screw hole with matching; Described set screws component comprises adjusts coupling screw 16 and nut, and described set screws component is arranged in a row above along the direction of tuning plug 9 movement, and the degree of depth that described tune coupling screw 16 gos deep in described resonant cavity 6 can regulate.
Described coupling seat 5 is made up of radio frequency interface 11, coupling plate 12, coupling loop 13, described radio frequency interface 11 is fixedly mounted on coupling plate 12 one end, described coupling loop 13 is wires, the two ends of line are welded with the other end of described radio frequency interface 11 inner core and described coupling plate 12 respectively, and coupling loop 13 and coupling plate 12 form the right-angled trapezium ring closed.
Described resonant cavity number is even number, is preferably four.
Described stepping motor 2 is arranged on described support 18, be connected with screw rod 21 in described transmission mechanism 3 by described shaft coupling 19, be provided with upper limit position switch 14 at described transmission mechanism 3 with the junction of described support 18, be provided with lower position switch 15 at described transmission mechanism 3 with the junction of described filter main body 4.
Fig. 1 is the front schematic view of a kind of broad tuning coaxial electrical of the present invention tunable filter.In embodiment, filter main body adopts the resonant cavity cascade of four quarter-wave resonances, completes the function of four chamber coaxial band-pass filters.Four resonant cavitys of filter main body are metallic aluminium structures, comprise cavity and cover plate, cavity integration processing.Drive circuit 1 is installed on mount 18, be positioned at the side of stepping motor 2, drive circuit 1 and stepping motor 2 have connecting line, and drive circuit 1 adopts routine techniques means, be inserted with pin-saving chip 17 above, pin-saving chip 17 with often overlap electrically tunable filter one_to_one corresponding.The U-shaped outer cover 20 that covering three is housed outside transmission mechanism 3 is dust-proof.On first, the 4th resonant cavity 6 outer wall of filter main body 4, at the both sides recess on the narrow limit of I-shaped coupling plate 12 of coupling seat 5, the multiple screw of two rows and set screws component is had to do frequency compensation device 10 respectively, frequency compensation screw is added in the position near resonant cavity 6 center line, what can effectively reduce screw stretches into the degree of depth, be conducive to power and the amplitude-frequency characteristic of filter, depending on the debugging situation of filter, the degree of depth that the tune coupling screw 16 of set screws component gos deep in resonant cavity is unequal.
Fig. 2 is the side sectional view of a kind of broad tuning coaxial electrical of the present invention tunable filter.In embodiment, transmission mechanism 3 comprises a screw rod 21, guide plate 22, two guide rods 23, and screw rod 21 is parallel with guide rod 23, vertical with guide plate 22 respectively and be connected; Stepping motor 2 is arranged on the support 18 of a chair shape, and by the screw rod 21 of shaft coupling 19 connection for transmission mechanism 3, drive circuit 1 is arranged on the backrest place of support 18, is positioned at the side of stepping motor 2.Between the chamber in filter main body 4, coupled structure 7 is the metallic plates having three rectangular opening combinations, the hollow circular-tube inner wire 8 that a beryllium-bronze material makes all is had in each resonant cavity 6, one end is fixedly connected with resonant cavity, cyclic spring comb is arranged at pipe other end top, moveable tuning plug 9 is also had in resonant cavity, in transmission mechanism 3, guide plate 22 connects one end of described tuning plug 9, the other end of tuning plug 9 enters resonant cavity through the center of described inner wire 8, and with the cyclic spring comb conductive contact of inner wire 8 port.The coupling seat 5 of filter input/output port uses the coupling plate 12 of brass sheet material, the radio frequency interface 11 of filter is arranged on coupling plate 12, coupling loop 13 directly welds radio frequency interface 11 inner core and coupling plate 12, form the coupling loop of right-angled trapezium, the excitation coupling amount of equalization filter under different operating frequency needed for constant bandwidth, wherein coupling seat is according to drawing making frock, is conducive to filter batch debugging.The outer wall of four resonant cavitys 6 all arranges frequency compensation device 10 along the moving direction of tuning plug 9, multiple screw hole and set screws component with matching, the tune coupling screw 16 of set screws component can go deep in resonant cavity 6, according to concrete conditions such as the amplitude-frequency characteristics of filter main body 4, what adjust screw 16 at any time stretches into the degree of depth.The frequency compensation device 10 of the coupling loop 13 of the coupled structure 7 that porous is coupled, removable coupling seat 5, right-angled trapezium and the adjusting of setting flexibly, has all ensured in filter full frequency band, wide region to have good response characteristic.
Fig. 3 is the schematic rear view of a kind of broad tuning coaxial electrical of the present invention tunable filter.In embodiment, second, third resonant cavity 6 outer wall of filter main body 4 is positioned at the position on resonant cavity 6 center line, respectively has the multiple screw of a row and set screws component to do frequency compensation device 10.The degree of depth that the tune coupling screw 16 of set screws component gos deep in resonant cavity 6 is unequal, adds frequency compensation when facilitating filter to debug.Stepping motor 2 is installed on mount 18; at transmission mechanism 3 and the junction of support 18, filter main body 4, upper and lower limit bit switch 14,15 is housed respectively; not only carry out automatically controlled motion break-in time limit position for electrically tunable filter; lower position switch 15 or electrically tunable filter change zero point during operating frequency; in communication equipment uses, provide position signalling, protection electrically tunable filter does not damage because of misoperation simultaneously.There is multiple screwed hole at the back side of coaxial electrical tunable filter, is installed in communication equipment easily.
Embodiment 2:
As shown in Figure 4, a kind of adjustment method of broad tuning coaxial electrical tunable filter, with the pass-band performance of network analyzer debugging filter, this adjustment method comprises the following steps:
A) two ports of network analyzer connect the radio frequency interface 11 of tested electrically tunable filter respectively;
B) manual rotation stepping motor 2, judges whether amplitude frequency curve that network analyzer occurs and echoing characteristics curve meet the demands, and with reference to amplitude-frequency and echo curve adjustment tuning plug 9 and frequency compensation device 10, the pass-band performance to filter reaches requirement;
C) will load the computer of testing software and DC power supply access debug system, computer continuous control stepping motor 2 rotates, and makes to take exercises in the upper limit position switch 14 of electrically tunable filter in transmission mechanism 3 and lower position switch 15 limited field break-in;
D) computer N continuous time automatically controlled adjustment electrically tunable filter, read the centre frequency of the filter passband amplitude frequency curve on network analyzer, record calibration data each time, described calibration data comprise stepping motor rotate umber of pulse and network analyzer on show corresponding centre frequency, N number of calibration data form one group of calibration array, and wherein N is greater than 20;
E) take a sample test calibration array in be no less than 5 calibration data, check filter main body 4 frequency repeatability and accuracy whether meet the demands, if can not meet the demands, turn to step F); If can meet the demands, turn to step G);
F) repair transmission mechanism, return steps A) again debug;
G) use programmable device by the calibration array of this cover electrically tunable filter in computer write pin-saving chip 17, and insert in the drive circuit 1 of electrically tunable filter, connect the connecting line of drive circuit 1 and stepping motor 2, debugging terminates.
Further, described B) comprise following concrete steps:
B1) manual rotation stepping motor 2, during amplitude frequency curve when network analyzer occurring highest frequency Fmax, with reference to amplitude-frequency and echo curve adjustment tuning plug 9, the pass-band performance to filter reaches requirement;
B2) be manually rotated counterclockwise stepping motor 2, from highest frequency Fmax, to centre frequency, change the operating frequency of filter from high to low, the amplitude-frequency characteristic of each frequency of Continuous Observation, judge whether filter meets passband amplitude-frequency characteristic; Described centre frequency is the half of highest frequency Fmax and low-limit frequency Fmin sum; If when can not meet passband amplitude-frequency characteristic, turn to step B3); If can meet the demands, turn to step B4);
B3) finely tune tuning plug 9 to filter bandpass characteristics to meet the demands; Turn to step B2);
B4) stepping motor 2 is manually rotated counterclockwise, change the operating frequency of filter from high to low, the amplitude-frequency characteristic of each frequency of Continuous Observation, from described center frequency points, until low-limit frequency Fmin, with reference to network analyzer display, at frequency compensation device 10 place, add set screws component successively, adjustment adjusts coupling screw 16 to stretch into the length of resonant cavity, until meet filter characteristic requirement; Turn to step B5);
B5) from low-limit frequency Fmin until highest frequency Fmax, manually turn clockwise stepping motor 2, and the amplitude-frequency characteristic of Continuous Observation filter on network analyzer and echoing characteristics, judge whether to meet filter specifications, if so, step B6 is turned to); If can not meet the demands, turn to step B1);
B6) nut of each set screws component is tightened.
In the present embodiment, two ports of network analyzer connect the radio frequency interface 11 on the coupling seat 5 of tested electrically tunable filter respectively, the shaft coupling 19 that manual rotation stepping motor 2 connects, makes amplitude frequency curve when network analyzer occurring highest frequency Fmax, with reference to amplitude-frequency and echo curve adjustment tuning plug 9, until the pass-band performance of filter reaches requirement, manually be rotated counterclockwise the shaft coupling 19 that stepping motor 2 connects, change the operating frequency of filter from high to low, the amplitude-frequency characteristic of each frequency of Continuous Observation, before centre frequency, judge whether filter amplitude-frequency characteristic meets the pass-band performance of filter, when passband requirements can not be met, tuning plug 9 is slightly adjusted, because adjust tuning plug at every turn, capital affects the high end frequency response of filter, therefore need to return highest frequency Fmax, again amplitude-frequency characteristic and the echoing characteristics of frequency is from high to low observed successively, avoid when high end frequency characteristic is not good, also continue the response curve of debugging low and middle-end frequency, cause debug process repeatedly, debugging efficiency is low, continue the shaft coupling 19 being manually rotated counterclockwise stepping motor 2 connection, the amplitude-frequency characteristic of each frequency of Continuous Observation, from centre frequency, until low-limit frequency Fmin, according to now amplitude-frequency characteristic, detection needs to add the position of adjusting coupling screw 16, successively from the direction of radio frequency interface side, needing, in the resonant cavity compensated, to add set screws component, judging and adjusting the degree of depth of coupling screw 16, avoid single tune coupling screw 16 to add the degree of depth excessively dark as far as possible, in order to avoid compensation rate is excessive, the inching of frequency is exceeded the proper limits in righting a wrong, reduce debugging chance repeatedly, the shaft coupling 19 that the last stepping motor 2 that manually turns clockwise connects, until highest frequency Fmax from low-limit frequency Fmin, check the filter characteristic in full frequency band, the amplitude-frequency characteristic of Continuous Observation filter on network analyzer and echoing characteristics, judge whether to meet filter specifications, if, then tighten the nut of each tune coupling screw 16, otherwise, repeat aforesaid step, till full frequency band reaches filter specifications.To load computer, the DC power supply access debug system of testing software, the continuous automatically controlled electrically tunable filter of computer, makes to take exercises in the limited field of electrically tunable filter upper and lower limit bit switch 14,15 in transmission mechanism break-in, checks moving situation, manual computer, control electrically tunable filter rotates, read the centre frequency of the filter passband amplitude frequency curve on network analyzer, record the centre frequency that the umber of pulse of stepping motor rotation each time and the network analyzer of correspondence thereof show, become the calibration array that a group has N number of corresponding data, wherein N is greater than 20, the number that N selects, suitably can add and subtract according to the excursion of frequency, if make beacon frequency more accurately can select large by N, if frequency tuning range is large, then N selects large, and at the high-end frequency interval that suitably can reduce to calibrate of frequency, namely the pulse that stepping motor rotates is gone forward one by one to count and is reduced, these all can improve beacon frequency precision, after omnidistance calibration process terminates, take a sample test the multiple data being no less than 5 in calibration array, check frequency repeatability and the accuracy of filter main body 4, substandard product maintenance transmission mechanism, use programmable device by the calibration array of this cover electrically tunable filter in computer write pin-saving chip 17, pin-saving chip 17 is inserted in the drive circuit 1 of electrically tunable filter, the connection plug of stepping motor 2 inserts in the socket of drive circuit 1, terminate current method of adjustment.
Claims (9)
1. a broad tuning coaxial electrical tunable filter, comprises drive circuit (1), the stepping motor (2) controlled by drive circuit (1), transmission mechanism (3), support (18), shaft coupling (19), outer cover (20) and filter main body (4); Described drive circuit (1) comprises pin-saving chip (17), is arranged on described support (18); Described transmission mechanism (3) comprises a screw rod (21), guide plate (22), two or more guide rod (23), described screw rod (21) is parallel with described guide rod (23), vertical with guide plate (22) respectively and be connected; Described filter main body (4) inside is provided with two or more resonant cavity (6) and one with coupled structure between epicoele (7); Inner wire (8) and moveable tuning plug (9) is provided with in described resonant cavity (6); Described inner wire (8) is metal hollow pipe, and one end is fixedly connected with described resonant cavity (6), and cyclic spring comb is arranged at pipe other end top; In described transmission mechanism (3), guide plate (22) connects one end of described tuning plug (9), the other end of described tuning plug (9) through the center of described inner wire (8), and with the cyclic spring comb conductive contact of described inner wire (8) port; It is characterized in that: described filter main body (4) roof is provided with two dismountable coupling seats (5) with radio frequency interface (11), described each coupling seat (5) comprises trapezoidal coupling loop (13), between described chamber, coupled structure (7) is for being provided with the metallic plate in two or more holes, and the outer wall of described each resonant cavity (6) is provided with frequency compensation device (10).
2. a kind of broad tuning coaxial electrical tunable filter as claimed in claim 1, is characterized in that: between described chamber, the upper hole arranged of coupled structure (7) is circular port, rectangular opening or polygonal hole.
3. a kind of broad tuning coaxial electrical tunable filter as claimed in claim 2, is characterized in that: between described chamber, the upper hole arranged of coupled structure (7) is three disjunct rectangular openings, along the directional spreding of described tuning plug (9) movement.
4. a kind of broad tuning coaxial electrical tunable filter as claimed in claim 1, is characterized in that: described frequency compensation device (10) is made up of more than one set screws component and screw hole with matching; Described set screws component comprises adjusts coupling screw (16) and nut, described set screws component is arranged in a row above along the direction of tuning plug (9) movement, and the degree of depth that described tune coupling screw (16) is goed deep in described resonant cavity (6) can regulate.
5. a kind of broad tuning coaxial electrical tunable filter as claimed in claim 1, it is characterized in that: described coupling seat (5) is made up of radio frequency interface (11), coupling plate (12), coupling loop (13), described radio frequency interface (11) is fixedly mounted on coupling plate (12) one end, described coupling loop (13) is a wires, the two ends of line are welded with the other end of described radio frequency interface (11) inner core and described coupling plate (12) respectively, and coupling loop (13) and coupling plate (12) form the right-angled trapezium ring closed.
6. a kind of broad tuning coaxial electrical tunable filter as claimed in claim 1, is characterized in that: described resonant cavity number is even number, is preferably four.
7. a kind of broad tuning coaxial electrical tunable filter as claimed in claim 1, it is characterized in that: described stepping motor (2) is arranged on described support (18), be connected with screw rod (21) in described transmission mechanism (3) by described shaft coupling (19), be provided with upper limit position switch (14) at described transmission mechanism (3) and the junction of described support (18), be provided with lower position switch (15) at described transmission mechanism (3) and the junction of described filter main body (4).
8. an adjustment method for the broad tuning coaxial electrical tunable filter as described in claim 1 ~ 7, with the pass-band performance of network analyzer debugging filter, it is characterized in that, this adjustment method comprises the following steps:
A) two ports of network analyzer connect the radio frequency interface (11) of tested electrically tunable filter respectively;
B) manual rotation stepping motor (2), judge whether amplitude frequency curve that network analyzer occurs and echoing characteristics curve meet the demands, adjust tuning plug (9) and frequency compensation device (10) with reference to amplitude-frequency and echo curve, the pass-band performance to filter reaches requirement;
C) computer and the DC power supply access debug system of testing software will be loaded, computer continuous control stepping motor (2) rotates, and makes to take exercises in the upper limit position switch (14) of electrically tunable filter in transmission mechanism (3) and lower position switch (15) limited field break-in;
D) computer N continuous time automatically controlled adjustment electrically tunable filter, read the centre frequency of the filter passband amplitude frequency curve on network analyzer, record calibration data each time, described calibration data comprise stepping motor rotate umber of pulse and network analyzer on show corresponding centre frequency, N number of calibration data form one group of calibration array, and wherein N is greater than 20;
E) take a sample test calibration array in be no less than 5 calibration data, check filter main body (4) frequency repeatability and accuracy whether meet the demands, if can not meet the demands, turn to step F); If can meet the demands, turn to step G);
F) repair transmission mechanism, return steps A) again debug;
G) use programmable device by the calibration array of this cover electrically tunable filter in computer write pin-saving chip (17), and insert in the drive circuit (1) of electrically tunable filter, connect the connecting line of drive circuit (1) and stepping motor (2), debugging terminates.
9. the adjustment method of a kind of broad tuning coaxial electrical tunable filter as claimed in claim 8, is characterized in that, described B) comprise following concrete steps:
B1) manual rotation stepping motor (2), during amplitude frequency curve when network analyzer occurring highest frequency Fmax, with reference to amplitude-frequency and echo curve adjustment tuning plug (9), the pass-band performance to filter reaches requirement;
B2) stepping motor (2) is manually rotated counterclockwise, from highest frequency Fmax, to centre frequency, change the operating frequency of filter from high to low, the amplitude-frequency characteristic of each frequency of Continuous Observation, judges whether filter meets passband amplitude-frequency characteristic; Described centre frequency is the half of highest frequency Fmax and low-limit frequency Fmin sum; If when can not meet passband amplitude-frequency characteristic, turn to step B3); If can meet the demands, turn to step B4);
B3) finely tune tuning plug (9) to meet the demands to filter bandpass characteristics; Turn to step B2);
B4) stepping motor (2) is manually rotated counterclockwise, change the operating frequency of filter from high to low, the amplitude-frequency characteristic of each frequency of Continuous Observation, from described center frequency points, until low-limit frequency Fmin, with reference to network analyzer display, at frequency compensation device (10) place, add set screws component successively, adjustment adjusts coupling screw (16) to stretch into the length of resonant cavity, until meet filter characteristic requirement; Turn to step B5);
B5) from low-limit frequency Fmin until highest frequency Fmax, manually turn clockwise stepping motor (2), and the amplitude-frequency characteristic of Continuous Observation filter on network analyzer and echoing characteristics, judge whether to meet filter specifications, if so, step B6 is turned to); If can not meet the demands, turn to step B1);
B6) nut of each set screws component is tightened.
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| CN108091966A (en) * | 2017-12-07 | 2018-05-29 | 南京乾波通信技术有限公司 | A kind of adjustable mechanical wave filter |
| CN113764841A (en) * | 2020-08-07 | 2021-12-07 | 卢西亚诺·阿卡蒂诺咨询公司 | Single-cavity filter |
| CN114050386A (en) * | 2021-09-24 | 2022-02-15 | 苏州畅恒通信科技有限公司 | Debugging method based on cavity filter scattering parameter and screw mapping extraction |
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| CN104393383B (en) | 2017-09-29 |
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