CN107221742A - A kind of two-band transmitting center-fed antenna of portable high frequency groundwave radar - Google Patents
A kind of two-band transmitting center-fed antenna of portable high frequency groundwave radar Download PDFInfo
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- CN107221742A CN107221742A CN201710539075.0A CN201710539075A CN107221742A CN 107221742 A CN107221742 A CN 107221742A CN 201710539075 A CN201710539075 A CN 201710539075A CN 107221742 A CN107221742 A CN 107221742A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/20—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements characterised by the operating wavebands
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Abstract
Launch center-fed antenna the invention discloses a kind of two-band of portable high frequency groundwave radar.Section, the part of pedestal 5 are constituted the present invention under section, antenna in section, trapper, antenna on antenna.Wherein, trapper is mainly composed in parallel by inductance Lx, electric capacity Cx.Pedestal includes line transformer and cable choke coil.When radar frequency f1 is far below resonant frequency of wave trapWhen, trapper is equivalent to loaded cable, and three section antenna bodies constitute typical center-fed antenna.When radar frequency f2 is equal to resonant frequency of wave trap, trapper is in high impedance, separates and is saved on antenna, section in antenna is reconstructed into new center-fed antenna with section and pedestal under antenna.Therefore, center-fed antenna of the invention and typical center-fed antenna be distinguished as there are two wider working frequency range, centre frequency is respectively f1 and f2, and most strong along the antenna pattern main lobe on ground, can significantly improve high frequency creeping radar combination property.
Description
Technical field
The present invention relates to a kind of compact antenna system of portable high frequency groundwave radar, specifically, be related to it is a kind of its
It is characterised by antenna in section SA, trapper XBQ, antenna that five parts such as section WB, pedestal JZ constitute two-band under section ZA, antenna
Launch center-fed antenna.
Background technology
The extra large state radar of portable high frequency for detecting Ocean surface currents, wave and wind field, as a result of compact list
Extremely son is used as reception antenna, it is not necessary to open up broad antenna field, pole as transmitting antenna using compact monopole crossed loops
The earth reduces construction and the maintenance cost of radar station, and seashore applies very convenient flexible, and therefore, this portable radar is being worked as
90 ﹪ are accounted in the high-frequency ground wave radar sum that this life circle puts into operation.
At present, in order to strengthen the function of portable high frequency groundwave radar, its performance is further improved, it is proposed that multiple-frequency operation
Mode.For example, due to " Kelvin effect " of seawater, depth of water 2m or so ocean current under working frequency 13MHz radar detection sea；
Due to " saturation effect " of ocean wave spectrum, the maximum significant wave height that can be detected is only about 7m.And working frequency 7MHz radar detection
Depth of water 3.5m or so ocean current under sea, the maximum significant wave height that can be detected is about 13.6m.Obviously, different frequency can be detected
To change of the ocean current with the depth of water.In general, radar operating frequency is higher, and the precision of detection data is higher, but detection range compared with
Closely；Frequency is relatively low, and detection data precision is relatively low, but detection range is farther out.In addition, for detecting during the movement target of sea, it is different
Frequency is easy to the target echo for finding to be flooded by single order marine echo.Using the radar of multiple frequencies work, the improvement of performance is
Obviously.
Traditional log-periodic antenna can work on over a wide frequency band, but its huge structure is complicated, is completely unsuitable for
Portable high frequency groundwave radar.
(Wu's generation ability etc., the double frequency for portable high frequency groundwave radar launches monopole antenna, patent of invention number to document 1：
ZL 2,012 1 0411260.9, authorized announcement date 2015-4-29) a kind of double frequency monopole transmitting antenna is provided, and each
The antenna pattern main lobe of frequency is all along ground, but because vertical monopole radiation current antinode is close to ground, in actual use
The characteristic of this monopole is influenceed very big by ground environment, causes the performance of high frequency creeping radar to be severely impacted.
Document 2 (high fire great waves Wu generation ability etc., the research of loading center fed antenna electrical characteristics, electric wave science journal, Vol.15,
No.3,2000.9) electrical characteristics of loading center fed antenna are theoretically relatively accurately analyzed, summarize the design step of this antenna
Suddenly, particularly point out, loading center fed antenna isolates, reduces peripherally substance environment influence, the CURRENT DISTRIBUTION improved in antenna, exhibition over the ground
Broadband, the electrical characteristics of holding antenna keep being basically unchanged in required bandwidth, with higher radiation efficiency, and radiate
Lobe amplitude levels off to ground.
The content of the invention
Vertical single pole two-band center-fed antenna on a kind of ground disclosed in this invention, is changed traditional in background technology
The concept and performance of monopole, double frequency monopole and classical center-fed antenna, can be operated in two frequency ranges, with excellent simultaneously
Ground wave property, so as to be more suitable as the transmitting antenna of multiband ground wave radar.
Launch center-fed antenna system it is an object of the invention to provide a kind of two-band suitable for portable high frequency groundwave radar
System.
To achieve these goals, the technical solution adopted in the present invention is as follows：
It saves on antenna and ZA is saved in SA, trapper XBQ, antenna, under antenna the five parts connection such as section WB, pedestal JZ and
Into being saved on antenna in SA and antenna and be connected to trapper XBQ between section ZA；ZA bottoms and the cable in section WB under antenna are saved in antenna
Cored wire top is connected；WB is saved under antenna with antenna base JZ to be connected；Specifically, have：
SA is saved on (1) antenna, is made of the copper conductor of outsourcing fiberglass, its a height of h3, lower end is equipped with connection trap
The copper sleeve of device.
(2) trapper XBQ components, the copper sleeve TJT of its upper and lower ends is connected with up and down two section antennas respectively；Two
Individual joint spins a raw glass steel pipe BLG.The inductance coil Lx made in the raw glass steel pipe containing one thin glass reinforced plastic pipe,
The electric capacity Cx welded on one support and inductance Lx composes in parallel resonant tank, and the resonant tank two ends lead passes through upper lower contact
Mesopore, is tightly fixed in connector slot by screw.
For the ease of adjustment, during prefabricated trapper XBQ, inductance Lx is unsuitable excessive, makes parallel resonance electric capacity Cx much larger than electricity
The distribution capacity of sense.Power taking sense Lx and electric capacity Cx desired value, make its resonance in the higher operational frequency f2 of radar；Wherein Cx is
High voltage bearing quality capacitance.
ZA is saved in (3) antennas, is made of the copper conductor of outsourcing fiberglass, conductor near top is connected to loaded cable L,
It is connected by copper sleeve with the trapper XBQ on top；Its a height of h2, lower end is equipped with the copper sleeve that WB is saved under connection antenna.
WB is saved under (4) antennas, is made of one section of firing cable of outsourcing glass reinforced plastic pipe, its a height of h1, with transmitting electricity
The upper end copper sleeve of cable core conductor welding is connected with saving bottom in antenna, spiral shell in the lower end connector welded with firing cable screen layer
Line spins with pedestal JZ joints, and the cored wire of cable connects above and below the structure design guarantee of two joints being mutually connected, up and down
The external shielding layer of cable connects.
(5) feed pedestals, mainly by antenna brazed joint JT, waterproof glass base steel seat JZ, alloy aluminum soleplate DB, no
Become rusty the base steel seat composition such as JJZ and firing cable joint DLT.Bottom plate DB is fixed on below fiberglass pedestal JZ with 6 M4 screws, and two
Equipped with circular water proof ring FSQ between person.Being made below bottom plate DB has capillary groove FSC.Fiberglass JZ overall construction designs realize excellent
Good water resistance.
Fiberglass pedestal JZ is main by line transformer BYQ, cable choke coil ELQ and radio frequency input cable joint DLT
Constituted with outsourcing fiberglass pedestal, wherein BYQ is connected into 1 to be wound on ferrite core:4 line transformer；ELQ is coiling
Cable choke coil on one group of ferrite core.
(6) inductance of two windings of line transformer BYQ in fiberglass pedestal JZ is respectively L3 and L4；Cable chokes
The inductance for enclosing ELQ core conductor windings is L1, is distributed electric capacity for C1, and the inductance of screen layer winding is L2, is distributed electric capacity for C2.
After ELQ inductance L1 and BYQ inductance L4 are in parallel, WB cable core conductor is saved under a termination antenna, other end connection radio frequency is defeated
Enter cable connector DLT cored wire.Screen layer winding inductance L2 one end of cable choke coil and the cable shield that WB is saved under antenna
Connection, the other end is connected to radio frequency input adapter DLT ground together with line transformer BYQ inductance L3 one end.
(7) the upright antenna on the ground built as described above, saves in SA, antenna wherein on antenna and is saved under section ZA, antenna
There is electric current Ia in WB cable core, and WB cable shield inwall has electric current-Ia, WB cable shield outer wall then has electricity
Flow Ib.Then, the cored wire electric current and screen layer wall currents opposite direction in WB are saved under antenna, the two constitutes transmission RF energy
Passage；At the same time, section ZA in cable shield outer wall electric current Ib and antenna, the electric current on antenna in section SA are saved in WB under antenna
Ia same-phases, are distributed the radiation current of whole day line and are similar to the distributing point joint JT of section WB with saving ZA in antenna under antenna
Neighbouring vertical symmetry oscillator, i.e. whole day line constitute a kind of new " middle feedback " antenna.
(8) antenna length h1, h2, h3 and loaded cable L, and cable choke coil winding are respectively especially saved in suitable design
The number of turns is with after Ferrite Material characteristic, making cable choke coil ELQ screen layer inductance L2 distribution capacity C2 resonance connected in parallel exist
Radar operating frequency f1, i.e.,Infinite-impedance is presented, with reference to line transformer BYQ broadband
With characteristic, it is zero to make electric current Ib distributions convergence at antenna base ground connection, and this has just completely cut off ground electrical characteristics to transmitting antenna performance
Influence, extend the working band of antenna, and make aerial radiation main lobe along sea level.Here it is classical center-fed antenna.
Now, radar operating frequency f1 is far below the resonant frequency f2 of trapper, and trapper XBQ mismatches are equivalent to one
Additional loaded cable, making the center operating frequency of former center-fed antenna somewhat reduces.Antenna overall height is H=h1+h2+h3.
(9) transmitting antenna is presented in the two-band installed by above-mentioned requirements, when radar operating frequency is equal to the humorous of trapper XBQ
During vibration frequency f2, due to Lx and Cx parallel resonances, trapper has very big impedance, causes on antenna section SA is equivalent and be isolated, its
Upper electric current goes to zero；ZA and section WB under antenna is saved in antenna and constitutes center-fed antenna of the resonance in f2 that overall height is equal to H '=h1+h2,
The radiation current amplitude of the antenna is still near middle feed point, though and the electric current at antenna base is not zero, also very little, radiation side
To figure main lobe close to ground.
The present invention has the advantages that：
1. double frequency of the invention transmitting center-fed antenna, can be operated in two independent frequency ranges, and antenna pattern main lobe
All close to ground direction, it is most apparent advantage is that the radiation current maximum of center-fed antenna is in antennas near feed point, antenna
Electric current at pedestal ground connection levels off to zero, substantially reduces influence of the antenna farm environment to antenna performance.Traditional monopole or
The radiance of double frequency monopole is then influenceed very big by antenna farm environment.
2. double frequency transmitting center-fed antenna is available for two frequency bands to work simultaneously；If using traditional center-fed antenna, different frequency bands
Need to set up the antenna of different height, need between antenna it is separated by a distance, it is difficult which increase radar station land used；In many
Feedback antenna will will also increase control converting system for different frequency bands work simultaneously, and this obviously increases the job costs of radar station.
3. compared with the complicated traditional log-periodic antenna of huge structure, only one day of two-band center-fed antenna of the invention
Line bar can be operated in two frequency ranges simultaneously, and this is the optimal selection of multifrequency portable high frequency groundwave radar.
4. two-band of the invention launches center-fed antenna, compared with double frequency transmitting monopole, except center-fed antenna is isolated
Outside the influence of antenna farm electrical characteristics, also with wider working band, this improves the overall performance of high frequency marine radar.
Brief description of the drawings
Fig. 1-the present invention " the double frequency transmitting center-fed antenna of portable high frequency groundwave radar " composition figure；
Fig. 2-double frequency launches the trapper structure chart of center-fed antenna；
Fig. 3-double frequency launches the feed base construction profile of center-fed antenna.
Line transformer and cable choke coil schematic diagram in the pedestal of Fig. 4-double frequency transmitting center-fed antenna.
Fig. 5-double frequency launches the current distributing figure of center-fed antenna：(a) radar is operated in compared with low-frequency range (centre frequency f1)
Antenna current is distributed；(b) radar is operated in the antenna current distribution of higher frequency band (centre frequency f2).
Fig. 6-mono- group double frequency transmitting center-fed antenna actual measurement standing-wave ratio curve：(a) operating center frequency is f1=8.1MHz's
The measurement voltage standing-wave ratio curve of prototype center-fed antenna；(b) in prototype antenna section and antenna in save between access trapper after
Actual measurement standing-wave ratio curve, the centre frequencies of two working frequency range is f1=7.35MHz；F2=11.70MHz.
1. in Fig. 1, SA is saved on antenna to be made up of glass reinforced plastic pipe Bao Yigen copper conductors, a height of h3.ZA is saved in antenna by glass
Glass steel pipe Bao Yigen copper conductors are made, and loaded cable a L, a height of h2 are wherein connected near copper conductor top.WB is saved under antenna
By being made compared with one section of 50 Ω firing cable of raw glass steel pipe bag, a height of h1.The trap between SA and middle section ZA is saved on antenna
Device XBQ is made up of the shunt inductance Lx and electric capacity Cx in glass reinforced plastic pipe, and two ends pass through in section SA and antenna on copper sleeve and antenna
Section ZA is connected.Combination has line transformer BYQ, cable choke coil ELQ and radio frequency input adapter DLT in fiberglass pedestal JZ
(in Fig. 1 RF be the cable connector cored wire).
2. trapper XBQ composition structure is showed in fig. 2, wherein：
Two copper sleeve joints of TJT-up and down, Ge centers secure inductance Lx electric capacity Cx parallel circuit contacts.
The raw glass steel pipe that BLG-mono- section suitably grows, two ends inwall has screw thread, spun with two joint TJT.
Lx-with the shunt inductance being wound on compared with blister copper wire on skeleton.
The outer high pressure quality capacitance in parallel with inductance Lx of Cx-skeleton.
3. the composition knot of the pedestal (including fiberglass pedestal JZ and stainless steel pedestal JJZ) of center-fed antenna is showed in figure 3
Structure, wherein：
JZ-fiberglass pedestal.
JJZ-mono- is in the hollow stainless steel pedestal of " work " font.
JT-mono- brass antenna terminal, upper end has screw thread to be spun with saving WB under antenna；Lower end is threaded into fiberglass
Pedestal JZ.Connector center hole have insulating materials fix radio frequency electrical cable core DLX contacts, joint JT then with radio-frequency cable screen up and down
Layer is covered to connect.
The circular alloy aluminum soleplate of DB-mono- piece.
BYQ-mono- is placed in 1 inside pedestal JZ:4 line transformers, its winding is wound on one with thick enamel-covered wire
On high frequency ferrite ring.
ELQ-mono- is placed in the high frequency cable choke coil inside pedestal JZ, and one is wound on 50 thin Ω high frequency cables
On group high frequency ferrite ring.
DLT-mono- is fixed on 50 Ω radio frequency input cable joints of the standard at bottom plate DB centers.
The circular rubber water proof ring of FSQ-between pedestal JZ and bottom plate DB.
The ring shape capillary groove that FSC-bottom plate DB is milled out below.
GD-fixing bolt.
JD-earth stud.
DM-radar station antenna field ground.
4. the line transformer BYQ and cable choke coil inside the fiberglass pedestal JZ in Fig. 3 are presented in Fig. 4
Specific connection between ELQ and upper connection JD and bottom radio frequency input cable joint DLT.
BYQ-be wound on ferrite core is connected into 1:4 line transformer, the inductance of two windings is respectively L3 and L4.
The choke coil of ELQ-be wound on the thin high frequency cables of 50 Ω on one group of ferrite core, the inductance of its cored wire winding is L1,
Distribution capacity is C1；The inductance of screen layer winding is L2, and distribution capacity is C2.
Cable core in being saved under the antenna for XA-be connected with top by the cable core DLX at brazed joint JT centers.
Section (radio-frequency cable screen layer in being saved under the antenna being connected by brazed joint JT with top) under WB-antenna.
RF-radio frequency input cable joint DLT cored wire.
GND-radio frequency input cable joint DLT ground.
5. depict in Figure 5 two-band launch center-fed antenna on the antenna body of two frequencies electric current with antenna body height
Distribution.
H-center-fed antenna whole height.
Terrain clearance on z-center-fed antenna.
The radiation electric flow valuve that certain is put on I-center-fed antenna.
Imax-center-fed antenna radiation current maximum.
The absolute value of certain point radiation current relative value on │ I/Imzx │-center-fed antenna.
(a)-CURRENT DISTRIBUTION on relatively low tranmitting frequency f1 center-fed antenna, radiation current is maximum near middle feed point,
Zero is leveled off in Near Ground radiation current.
(b)-CURRENT DISTRIBUTION on higher tranmitting frequency f2 center-fed antenna, radiation current is maximum near middle feed point,
Trapper XBQ above radiation currents are zero, are not zero in Near Ground radiation current, but very little.
6. the standing-wave ratio measured curve of two kinds of center-fed antenna has been presented in Fig. 6, wherein, (a) is feedback in one-segment prototype
The actual measurement standing-wave ratio curve of antenna；(b) to be double after access trapper XBQ between the section SA and middle section ZA on prototype center-fed antenna
The actual measurement standing-wave ratio curve of frequency range center-fed antenna.
(a) center operating frequency of one-segment prototype center-fed antenna is f1=8.1MHz., voltage standing wave ratio VSWR≤2.5
Working band width be 3.7MHz.
(b) two working frequency range of two-band center-fed antenna are respectively：Relatively low center operating frequency f1=7.35MHz,
The working band width of voltage standing wave ratio VSWR≤2.5 is 2.4MHz；Higher center operating frequency f2=11.70MHz, voltage
The working band width of standing-wave ratio≤2.5 is 2.3MHz.
Embodiment
The embodiment of " two-band transmitting center-fed antenna " of the invention is further illustrated below in conjunction with the accompanying drawings.
First, according to the centre frequency f1 in two working frequency range of radar of setting compared with low-frequency range, radar wavelength λ 1, root are obtained
According to the design requirement of center-fed antenna, antenna overall height H<0.5 λ 1, now antennas orthogonal surface radiation directional pattern is in " ∞ " shape, is not had
There is secondary lobe, while horizontal directivity pattern is in omnidirectional's shape.From the highest frequency of the frequency range, then H=0.3 λ 1 are can use.If
Need further to reduce antenna height, it is necessary to carry out concentrated loading to antenna, load(ing) point is located at antenna 0.7H height, avoided
Radiation current antinode sentences reduction loss, and with the effect of increase loading in the height with appropriate high current；Loading
Inductance is L (such as 5 μ H).Then, the whole height for finally choosing center-fed antenna is H=0.2 λ 1 (such as example is 7m).Further
Making follow the steps below.
(1) rule of thumb carefulness determines the ratio up and down (up and down than about 1.38~1.44) of center-fed antenna body, to ensure
Current minimum falls near antenna bottom, and the gain of antenna is higher in whole working frequency range, is radiated along ground direction most strong.It is real
Take and compare above and below antenna for 4/3 in example.
(2) for the convenience installed and transported, center-fed antenna upper part is divided into two sections of equal length, i.e., on antenna
Save SA height h3=2m；ZA height h2=2m is saved in antenna.(WB height h1=3m, center-fed antenna overall height H is saved under antenna
=h1+h2+h3=7m.)
(3) make on antenna and save SA.By an external diameter be 5mm, long 2m brass guide lower end be fixed on brazed joint JT
On, joint JT is screwed in the glass reinforced plastic pipe of appropriate length and external diameter, closure tip, and SA is saved on the antenna being just made.
(4) make in antenna and save ZA.A piece external diameter 5mm, the brass guide lower end for being about 1.8m are fixed under brass and connect
On head JT；Welded at the top of the loaded cable L (example is 5 μ H) being wound in the upper end welding of brass guide on bakelite rod, inductance L
There is extraction wire；The glass reinforced plastic pipe of appropriate length and external diameter is packed into and spun after saving ZA in antenna with low side brazed joint, glass
Hydraulic reclamation foamed plastics in steel pipe；The extraction wire on loaded cable L tops is passed from top connection mesopore, brass top connection JT is revolved
Glass reinforced plastic pipe is connect, wipes out and loaded cable lead-out wire is welded.
(5) trapper XBQ is made as shown in Figure 2.Wherein most heavy is basis
When determining parallel resonant inductor Lx and electric capacity Cx, inductance Lx can not be too big, electric capacity Cx is much larger than the distribution of inductance
Electric capacity, such as electric capacity Cx is not less than tens (pF), so just it is conveniently adjusted control trapper XBQ resonance.Interception one section compared with
The glass reinforced plastic pipe for carefully (being such as about 8cm, diameter about 2.2cm) is as coiling electricity Lx skeleton, and the skeleton, which is got on the bus, screw thread, and two ends are bored
There is aperture, be easy to winding and fixed inductance wire.Take one section of sufficiently long blister copper wire (be such as about 1.2m, diameter about 1.5~
2mm), an aperture through skeleton one end, reserves sufficiently long lead, tenses wire coiling inductance N on skeleton and encloses, finally
Wire other end is tightened through to the aperture on skeleton, just coiling is completed inductance Lx.By the wire between aperture in skeleton two ends
Tin is cleaned, for connecing shunt capacitance.The inductance value for measuring the inductance is Lx (μ H), then it is Cx to calculate shunt capacitance by (1) formula
(pF).By selected electric capacity Cx skeleton loong shunt be welded on skeleton two ends on tin inductance leads on.
By trapper joint TJT precession raw glass steel pipes BLG one end, then by the inductance of the above-mentioned coiling on skeleton
Lx, electric capacity Cx parallel combination bodies are fitted into glass reinforced plastic pipe BLG, and carefulness allows inductance leads to be passed from joint TJT mesopores, solid with screw
It is scheduled in joint groove.Then above-mentioned inductance other end lead from another trapper joint TJT mesopore are passed, then
Joint precession raw glass steel pipe BLG, then inductance leads are fixed on joint TJT tops with screw.
One it is important test result indicates that, in antenna bulk testing, when working frequency is f1, trapper mismatch,
For example same loaded cable of its effect, it make antenna whole height incrementss be approximately equal to coiling inductance L conductor length (including
Two ends lead).
(6) make under antenna and save WB.One section of Ω high-frequency high-power firing cable of standard 50 for being about 3m is cut, by its lower end core
Conductor is welded on the contact that bottom brass female fitting JT central insulations are fixed, and its external shielding layer is directly anchored into joint JT
On；The core conductor of high-frequency emission cable upper end is stripped out one section；Ready long 3m high intensity raw glass steel poling is put
Firing cable, then screws in lower contact JT, the hydraulic reclamation foamed plastics in glass reinforced plastic pipe cavity；Firing cable core conductor is stripped out
One transfixed top connection JT, and after joint and glass reinforced plastic pipe are spun, firing cable core conductor is welded on top connection top.
Bottom brass female fitting central insulation core conductor contact periphery, is symmetrically fixed with two brass spring pieces, for day
Ensure that power-on and power-off cable core conductor contacts good with core conductor, screen layer with screen layer when section screws in pedestal JZ brazed joint under line
It is good.
(7) as Fig. 3 makes center-fed antenna pedestal JZ.It is that its bottom surrounding is from finished glass base steel seat JZ first
4 10mm fixed bolt holes are had, and its internal cavity is enough to place the line transformer BYQ and cable choke coil around making
ELQ。
Key is to make brazed joint JT.There is circular hole at its center, and for the fixed cable core DLX that insulate, top has slightly convex
The conductor cores contact round dot gone out, when ensureing that section joint is screwed in and combined closely under antenna, the core conductor of cable is that contact is good up and down
Alright.At the same time, the contact of cable shield well relies on the two panels brass shell fragment in brass female fitting above with up and down
Good contact at the top of joint JT.
After line transformer BYQ and cable choke coil ELQ in fiberglass pedestal JZ are connected according to Fig. 4 requirements,
Hydraulic reclamation foamed plastics is fixed in pedestal JZ cavitys.
Circular alloy aluminum soleplate DB surroundings have the 4 10mm bolts hole coordinated with fiberglass pedestal JZ low sides, upper facing cut
Rubber water proof ring FSQ circular trough is installed, the capillary groove of circle is milled with below, there is installation radiofrequency signal input cable head at center
DLT hole.
(8) stainless steel pedestal JJZ making.One section of external diameter 80mm, wall thickness 2mm, long 160mm stainless steel tube are taken, at it
Waist opens diameter 25mm radio-frequency transmissions cable inlet, there is 8 symmetrical 4mm screw holes in low side surrounding, for peace
Earth mat is filled to use.It is another to take the stainless steel plate that thickness is 2mm, two pieces of external diameters equal with alloy aluminum soleplate DB external diameters, internal diameter and not is made
Become rusty the identical annulus of pipe diameter, and its surrounding is provided with and 4 10mm bolts hole of identical on bottom plate DB.By two pieces of stainless steel annulus
I-shaped stainless steel pedestal JJZ is welded into stainless steel tube.
2nd, the overall in-site installation of double frequency transmitting center-fed antenna and test
When in-site installation double frequency launches center-fed antenna, firing cable is penetrated from stainless base steel seat JJZ waist circular holes, with hair
After radio cable joint DLT spins, fiberglass pedestal JZ is fixed up with stainless steel pedestal JJZ with 4 8mm bolts.
Be spun closely as shown in figure 1, first WB and antenna base JZ will be saved under antenna, then order install saved in antenna ZA,
SA is saved on trapper XBQ and antenna, tripartite's drawstring of high-strength corrosion-resisting is connected after two layers of bracing wire circle on set on antenna body,
When antenna is upright, two layers of drawstring of tripartite is fixed on three firm earth anchors from alternate 120 degree of 4-5m of antenna base,
Antenna base is fixed on ground simultaneously.
After the erection for completing whole antenna, the resonance characteristic that the double frequency launches center-fed antenna is tested with Network Analyzer,
The SWR measurement result of transmitting antenna is presented in double frequency as shown in Fig. 6 (b), it was demonstrated that resonance is the antenna in centre frequency really
In f1 and f2 two frequency ranges.Using signal source and other standard antennas, power signal is added in double frequency transmitting presents day respectively
On line and other standards monopole, receive the radiation signal of various antennas in the distance outside away from antenna 1km respectively successively, test
Demonstrate,prove characteristic of the double frequency transmitting center-fed antenna radiation main lobe along ground and be better than other antennas.Double frequency transmitting center-fed antenna in the present invention
On the antenna body of two frequencies electric current with antenna body height distribution as shown in figure 5, its radiation current is most near middle feed point
Greatly, and in Near Ground radiation current very little, peripherally substance environment influence has been completely cut off substantially, it is not necessary to set up ground system, had
There is excellent stability.
Claims (6)
1. a kind of two-band transmitting center-fed antenna of portable high frequency groundwave radar, it is characterised in that：Including saving SA on antenna, falling into
Section WB, pedestal JZ under ZA, antenna are saved in ripple device XBQ, antenna；Saved on antenna in SA and antenna and be connected to trapper XBQ between section ZA；
ZA bottoms are saved in antenna to be connected with saving the cable core top in WB under antenna；WB is saved under antenna with antenna base JZ to be connected；My god
SA is saved on line includes the conductor of outsourcing fiberglass, high h3；ZA is saved in antenna includes the conductor of outsourcing fiberglass, and the conductor top is attached
It is connected to a loaded cable L, overall height h2；WB is saved under antenna includes the coaxial transmission line of one section of outsourcing fiberglass, overall height h1；Institute
State trapper XBQ include in parallel inductance Lx and electric capacity Cx, one section of outsourcing glass reinforced plastic pipe and its two ends respectively with saved on antenna SA,
Two metal joints that ZA realizes electrical connection are saved in antenna.
2. a kind of two-band transmitting center-fed antenna of portable high frequency groundwave radar as described in claim 1, it is characterised in that：
Fiberglass is surrounded by outside the pedestal JZ, it is internal including line transformer BYQ, cable choke coil ELQ and radio frequency input cable
Joint RF, wherein BYQ are connected into 1 to be wound on ferrite core:4 line transformer；ELQ is to be wound on one group of ferrite core
On coaxial cable for high frequency choke coil.
3. a kind of two-band transmitting center-fed antenna of portable high frequency groundwave radar as described in claim 1 or 2, its feature exists
In：Two winding inductances of the transformer BYQ are respectively L3 and L4；The inductance of cable choke coil ELQ core conductor windings is L1,
Distribution capacity is C1；The inductance of screen layer winding is L2, and distribution capacity is C2；ELQ inductance L1 and BYQ inductance L4 are in parallel
Afterwards, WB cable core conductor, other end connection radio frequency input cable joint DLT cored wire RF are saved under a termination antenna；Cable is gripped
Flow screen layer winding inductance L2 one end of circle and be connected with saving WB cable shield under antenna, the other end and line transformer
BYQ inductance L3 one end is connected to radio frequency input adapter DLT ground together.
4. a kind of two-band transmitting center-fed antenna of portable high frequency groundwave radar as described in claim 1 or 2, its feature exists
In：Each section antenna length h1, h2, h3 and loaded cable L of design, and cable choke coil number of winding turns and Ferrite Material spy
Property, makes cable choke coil ELQ screen layer inductance L2 distribution capacity C2 resonance connected in parallel in radar operating frequency f1, i.e.,Equivalent open circuit, it is zero to make CURRENT DISTRIBUTION convergence at antenna base ground connection.
5. a kind of two-band transmitting center-fed antenna of portable high frequency groundwave radar as described in claim 1, it is characterised in that：
Trapper XBQ shunt inductance Lx and electric capacity Cx is designed, makes its resonance in the working frequency f2 of radar, i.e.,Equivalent open circuit；Now, SA is saved on antenna to be isolated, ZA and section WB and pedestal structure under antenna are saved in antenna
Cheng Xin center-fed antenna.
6. a kind of two-band transmitting center-fed antenna of portable high frequency groundwave radar as described in claim 5, it is characterised in that：
When radar is operated in the frequency f1 far below f2, trapper XBQ mismatches are equivalent to a loaded cable, when it influences design
It is included among the loaded cable L that ZA is saved in antenna.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710539075.0A CN107221742B (en) | 2017-07-04 | 2017-07-04 | Dual-band transmitting feed-in antenna of portable high-frequency ground wave radar |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710539075.0A CN107221742B (en) | 2017-07-04 | 2017-07-04 | Dual-band transmitting feed-in antenna of portable high-frequency ground wave radar |
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| CN107221742B CN107221742B (en) | 2023-05-05 |
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| US20120154236A1 (en) * | 2009-05-06 | 2012-06-21 | Bae Systems Information And Electronic Systems Integration Inc. | Multiband whip antenna |
| CN102904024A (en) * | 2012-10-24 | 2013-01-30 | 武汉大学 | Double-frequency transmitting monopole antenna for portable high-frequency ground wave radar |
| CN104319457A (en) * | 2014-10-15 | 2015-01-28 | 中船重工鹏力（南京）大气海洋信息系统有限公司 | Receiving/transmitting integrated high-frequency ground wave radar antenna |
| CN207217752U (en) * | 2017-07-04 | 2018-04-10 | 武汉大学 | A kind of two-band transmitting center-fed antenna of portable high frequency groundwave radar |
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2017
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| EP0634806A1 (en) * | 1993-07-13 | 1995-01-18 | Kabushiki Kaisha Yokowo | Radio antenna |
| US20120154236A1 (en) * | 2009-05-06 | 2012-06-21 | Bae Systems Information And Electronic Systems Integration Inc. | Multiband whip antenna |
| CN102904024A (en) * | 2012-10-24 | 2013-01-30 | 武汉大学 | Double-frequency transmitting monopole antenna for portable high-frequency ground wave radar |
| CN104319457A (en) * | 2014-10-15 | 2015-01-28 | 中船重工鹏力（南京）大气海洋信息系统有限公司 | Receiving/transmitting integrated high-frequency ground wave radar antenna |
| CN207217752U (en) * | 2017-07-04 | 2018-04-10 | 武汉大学 | A kind of two-band transmitting center-fed antenna of portable high frequency groundwave radar |
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| CN107221742B (en) | 2023-05-05 |
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