CN105676007A - Dipole antenna and omnidirectional probe employing same - Google Patents

Abstract

The invention relates to the technical field of electromagnetic field measurement, and specifically related to a dipole antenna and an omnidirectional probe. The antenna comprises an antenna main body, and the antenna main body comprises a plurality of sub-antennas. The axes of the plurality of sub-antennas are disposed in the same line. Moreover, in each two adjacent sub-antennas, the width of one sub-antenna, close to a first end of the antenna main body, is greater than the width of the sub-antenna close to the second end of the antenna main body. An end part, far from the first end of the antenna main body, of each sub-antenna is connected with a connection resistor. The adjacent sub-antennas are connected through the connection resistors. In each two adjacent connection resistors, the resistance value of the connection resistor, close to the first end of the antenna main body, is greater than the resistance value of the connection resistor close to the second end of the antenna main body. The antenna increases the equivalent length, enlarges the frequency measurement range of the probe, especially improves the frequency response characteristics of low-frequency bands, and achieves the better receiving of a broadband electromagnetic field signal.

Description

Dipole antenna and use the omni-directional of this dipole antenna to pop one's head in

Technical field

The present invention relates to electromagnetic field measurements technical field, specifically, it relates to a kind of dipole antenna and use the omni-directional of this dipole antenna to pop one's head in.

Background technology

At present, when radio frequency electromagnetic field is measured, it is generally required to adopt three axle isotropy probes, just can realize the measurement to three-dimensional space comprehensive electromagnetic field. And according to IEEE-1309 standard, the support bar of radio-frequency electromagnetic Field probe, namely high resistance line part need with X, Y, Z tri-axle all become 54.7 °, and X, Y, Z tri-before axle mutually not vertically. On testing standard and market, the requirement normally 100kHz-3GHz of radio frequency electric field probe operating frequency range, even reaches 100kHz-6GHz. During three current axle isotropy are popped one's head in, in order to ensure the size of probe certain among a small circle in so that the length of the antenna that probe uses is very short, thus causes existing rf electric field probe usually poor in low-frequency range response.

Therefore, a kind of frequency that can expand probe rings characteristic, and particularly the omni-directional probe of low-frequency range frequency sound characteristic becomes present problem demanding prompt solution.

Summary of the invention

In view of this, the object of the embodiment of the present invention is that the omni-directional providing a kind of dipole antenna and using this dipole antenna is popped one's head in, it is possible to the frequency expanding probe rings characteristic, particularly low-frequency range sound characteristic frequently.

First aspect, embodiments provides a kind of dipole antenna, comprising: antenna body;

Described antenna body comprises multistage sub antenna;

The axis of sub antenna described in multistage is all on same bar straight line, and in two often adjacent described sub antennas, the width near the sub antenna of the first end of described antenna body is greater than the width of the sub antenna of the 2nd end near described antenna body;

Every section of described sub antenna is all connected with contact resistance away from the end of the first end of described antenna body;

Adjacent described sub antenna is all connected by described contact resistance;

In two often adjacent described contact resistances, the resistance near the contact resistance of the first end of described antenna body is greater than the resistance of the contact resistance of the 2nd end near described antenna body.

Second aspect, the embodiment of the present invention also provides a kind of omni-directional probe, comprising: three pieces of circuit cards;

Three pieces of described circuit cards connect between two, form an equilateral triangular prism, and three pieces of described circuit cards are respectively three sides of described equilateral triangular prism;

Circuit card described in every block is provided with dipole antenna as claimed in claim 1;

Angle between the axis of described antenna body and the incline of described equilateral triangular prism is 54.7 °.

In conjunction with second aspect, embodiments providing the first possible enforcement mode of second aspect, the dipole antenna on circuit card described in each all has two;

The axis of two described dipole antennas is on same bar straight line;

On two described dipole antennas, the first end of antenna body is close to each other, and is connected by Schottky detector diode between the described sub antenna of the first end of described antenna body.

In conjunction with second aspect, embodiments providing the 2nd kind of possible enforcement mode of second aspect, described antenna body is arranged on the side of described circuit card near other described circuit card;

Described contact resistance and described Schottky detector diode are arranged on the side of described circuit card away from other described circuit card.

In conjunction with second aspect, embodiments providing the third possible enforcement mode of second aspect, on two described dipole antennas, two connection terminals near described Schottky detector diode connect a high resistance resistor chain respectively by electric capacity.

In conjunction with second aspect, embodiments provide the 4th kind of possible enforcement mode of second aspect, the high resistance resistor chain that dipole antenna described with two is connected respectively lays respectively at the both sides of described circuit card, and two described height resistance resistor chains are symmetrical arranged along described circuit card.

In conjunction with second aspect, embodiments provide the 5th kind of possible enforcement mode of second aspect, the described axis of height resistance resistor chain and the axes normal of described dipole antenna.

In conjunction with second aspect, embodiments providing the 6th kind of possible enforcement mode of second aspect, described height resistance resistor chain is also connected with high resistance line away from one end of described electric capacity.

In conjunction with second aspect, embodiments providing the 7th kind of possible enforcement mode of second aspect, described height resistance line is attached on flexible PCB.

In conjunction with second aspect, embodiments provide the 8th kind of possible enforcement mode of second aspect, also comprise base;

Described base is provided with card groove; Described circuit card is installed in described card groove.

Dipole antenna and use the omni-directional of this dipole antenna to pop one's head in, antenna body is divided into multistage sub antenna, and the width of each cross-talk antenna is reduced to the other end gradually by one end of antenna body, simultaneously, connect to get up by contact resistance by between adjacent sub antenna, and the resistance of contact resistance is reduced to the other end gradually by one end of antenna body, dipole antenna is made can better to receive the electromagnetic field signal of different frequency, add the equivalent length of dipole antenna, expand the survey frequency scope of probe, the frequency particularly improving low-frequency range rings characteristic, realize better being received by broadband electromagnetic field signal.

For making above-mentioned purpose, the feature and advantage of the present invention become apparent, better embodiment cited below particularly, and coordinate appended accompanying drawing, it is described in detail below.

Accompanying drawing explanation

In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, it is briefly described to the accompanying drawing used required in embodiment below, it is to be understood that, the following drawings illustrate only some embodiment of the present invention, therefore should not be counted as is the restriction to scope, for those of ordinary skill in the art, under the prerequisite not paying creative work, it is also possible to obtain other relevant accompanying drawings according to these accompanying drawings.

Fig. 1 shows the structural representation of a kind of dipole antenna that the embodiment of the present invention provides;

During a kind of omni-directional that Fig. 2 shows the embodiment of the present invention to be provided is popped one's head in, the front elevational schematic of circuit card;

During a kind of omni-directional that Fig. 3 shows the embodiment of the present invention to be provided is popped one's head in, the schematic rear view of circuit card;

Fig. 4 show the omni-directional that the embodiment of the present invention provides pop one's head in principle schematic;

Fig. 5 show the omni-directional that the embodiment of the present invention provides pop one's head in principle schematic;

Fig. 6 shows the structural representation of the omni-directional probe that the embodiment of the present invention provides;

Illustrate:

Antenna body 10, sub antenna 101, contact resistance 102;

Circuit card 20, dipole antenna 30, Schottky detector diode 40, electric capacity 50, high resistance resistor chain 60, high resistance line 70, base 80, card groove 90.

Embodiment

Below in conjunction with accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only the present invention's part embodiment, instead of whole embodiments. The assembly of the embodiment of the present invention usually describing in accompanying drawing herein and illustrating can be arranged with various different configuration and design. Therefore, below to the detailed description of the embodiments of the invention provided in the accompanying drawings and the scope of the claimed the present invention of not intended to be limiting, but only represent the selected embodiment of the present invention. Based on embodiments of the invention, other embodiments all that those skilled in the art obtain under the prerequisite not making creative work, all belong to the scope of protection of the invention.

Three axle isotropy are used to pop one's head in when measuring for radio frequency electromagnetic field at present, owing to three current axles are respectively to communication probe this body structure Problems existing, corresponding poor in low-frequency range, fluctuation in the bandwidth required by IEEE-1309 standard can not be met and it is less than the requirement of 3dB, based on this, the application provides a kind of dipole antenna and uses the omni-directional of this dipole antenna to pop one's head in, it is possible to the frequency expanding probe rings characteristic, particularly low-frequency range sound characteristic frequently.

For ease of the present embodiment is understood, a kind of dipole antenna disclosed in the embodiment of the present invention is carried out detail below, this dipole antenna is mainly used in omni-directional probe, for the radio frequency electromagnetic field of omnidirectional in three-dimensional space is detected, in addition, it is also possible to be used in other to the stricter occasion of antenna requirement.

It should be noted that, in describing the invention, it is based on orientation shown in the drawings or position relation that the orientation of the instruction such as term " " center ", " on ", D score, "left", "right", " vertically ", " level ", " interior ", " outward " or position are closed; be only the present invention for convenience of description and simplified characterization; instead of the device that refers to of instruction or hint or element must have specific orientation, with specific orientation structure and operation, therefore can not be interpreted as limitation of the present invention. In addition, term " first ", " the 2nd ", " the 3rd " are only for describing object, and can not be interpreted as instruction or hint relative importance.

In addition, in describing the invention, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, such as, it is possible to be fixedly connected with, it is also possible to be removably connect, or connect integratedly; Can be mechanically connected, it is also possible to be electrical connection; Can be directly be connected, it is also possible to be indirectly connected by intermediary, it is possible to be the connection of two element internals.For the ordinary skill in the art, it is possible to particular case understands above-mentioned term concrete implication in the present invention.

It is noted that the two ends of antenna body 10 are called first end and the 2nd end by the embodiment of the present invention, but in fact, this is not distinguished at the two ends of antenna body 10, only just for convenience. Therefore the first end of antenna body and the 2nd end should not become the restriction of the embodiment of the present invention.

Shown in Figure 1, the dipole antenna that the embodiment of the present invention provides comprises: antenna body 10;

Described antenna body 10 comprises multistage sub antenna 101;

The axis of sub antenna 101 described in multistage is all on same bar straight line, and often in adjacent two described sub antennas 101, the width near the sub antenna 101 of the first end of described antenna body 10 is greater than the width of the sub antenna 101 of the 2nd end near described antenna body 10;

Every section of described sub antenna 101 is all connected with contact resistance 102 away from the end of the first end of described antenna body 10;

Adjacent described sub antenna 101 is all connected by described contact resistance 102;

In the described contact resistance 102 of often adjacent two, the resistance near the contact resistance 102 of the first end of described antenna body 10 is greater than the resistance of the contact resistance 102 of the 2nd end near described antenna body 10.

When specific implementation, in HJ/T10.2-1996 " radiation environment conservative management leads then electromagnetic radiation monitoring instruments and methods ", the principle of work of probe there is is following description:

Dipole antenna equivalent capacity C_A, inductance L_A, try to achieve according to bipyramid antenna theory:

$C_A=\frac{\mathrm{\π}\·{\mathrm{\ϵ}}_0\·L}{\ln \frac{L}{a}+\frac{S}{2L}-1}$

$L_A=\frac{{\mathrm{\μ}}_0\·L}{3\mathrm{\π}}(ln\frac{2L}{a}-\frac{11}{b})$

In formula: α dipole antenna radius; S dipole antenna cross section; L dipole antenna physical length.

Owing to dipole antenna impedance is capacitive, output voltage is the function of frequency:

$V=\frac{L}{2}\·\frac{\mathrm{\ω}\·C_A\·R_L}{\sqrt{1+{\mathrm{\ω}}^2{(C_A+C_L)}^2{R}_L^2}}$

In formula: ω radian frequency, ω=2 π f, f frequency;

C_LDipole antenna slots electric capacity and load electric capacity; R_LPull-up resistor.

By formula

$V=\frac{L}{2}\·\frac{\mathrm{\ω}\·C_A\·R_L}{\sqrt{1+{\mathrm{\ω}}^2{(C_A+C_L)}^2{R}_L^2}}$

It may be seen that when ω is bigger, due toTherefore:

$V\≈\frac{L}{2}\·\frac{\mathrm{\ω}\·C_A\·R_L}{\mathrm{\ω}\·(C_A+C_L)\·R_L}=\frac{L}{2}\·\frac{C_A}{C_A+C_L}$

ω=2 π f, f are frequency again, namely represent at high band, and output voltage is not almost by the impact of frequency, and namely frequency response is better.

And in low-frequency range, owing to ω is less, cannot makeC must be improved_A, makeBy C in standard_AFormula be not difficult to find out, C will be improved_A, L will be increased, i.e. the length of dipole antenna.

In dipole antenna provided by the present invention, antenna body is divided into multistage sub antenna, and the width of each cross-talk antenna is reduced to the other end gradually by one end of antenna body, simultaneously, connect to get up by contact resistance by between adjacent sub antenna, and the resistance of contact resistance is reduced to the other end gradually by one end of antenna body, dipole antenna is made can better to receive the electromagnetic field signal of different frequency, add the equivalent length of dipole antenna, expand the survey frequency scope of probe, the frequency particularly improving low-frequency range rings characteristic, realize better being received by broadband electromagnetic field signal.

Another embodiment of the present invention also provides a kind of omni-directional probe.

Shown in Fig. 2, Fig. 3, Fig. 4 and Fig. 5, the omni-directional probe that the embodiment of the present invention provides comprises: three pieces of circuit cards 20;

Three pieces of described circuit cards 20 connect between two, form an equilateral triangular prism, and three pieces of described circuit cards 20 are respectively three sides of described equilateral triangular prism;

Circuit card 20 described in every block is provided with the dipole antenna 30 as the embodiment of the present invention provides;

Angle between the incline of described antenna body 10 and described equilateral triangular prism is 54.7 °.

When specific implementation, shown in Figure 4, the circuit card of ' C, C ' A that assumes that AA ' B ' B (" " represents tetragon), BB ' C ' C, CC ' A ' A are three pieces and are provided with dipole antenna A ' B, B, its end face △ ABC (" △ " represents trilateral) and △ A ' B ' C ' is equilateral triangle, three pieces of circuit cards define an equilateral triangular prism, and BB ', CC ', AA ' are respectively three inclines of equilateral triangular prism; The angle (θ) of dipole antenna A ' B, B ' C, C ' A and three incline is 54.7 °. Get the mid point O on B ' C ' limit, connect A ' O, OB, owing to above-mentioned △ A ' B ' C ' is equilateral triangle, A ' O ⊥ B ' C ', again △ A ' B ' C ' ⊥ BB ' C ' C, therefore A ' O ⊥ BB ' C ' C, so A ' O ⊥ B ' C. Shown in Figure 5, in BB ' C ' C, B ' C ' ∥ BC and ⊥ BB '. Due to θ=54.7 °, $sin\mathrm{\θ}=\sqrt{2}/\sqrt{3},$ If $B^{,}C=\sqrt{3}a,BC=\sqrt{2}a,$ Obtain BB '=α, againObtain according to Pythagorean theoremDue to B ' C ' ∥ BC, therefore $B^{,}D=DC/2=B^{,}C/3=\sqrt{3}a/3,DB=2OD=2OB/3=\sqrt{2}a/\sqrt{3},$ Can be calculated BD²+DB’²=BB '², meet Pythagorean theorem, therefore OB ⊥ B ' C, so B ' C ⊥ △ A ' OB, i.e. A ' B ⊥ B ' C. ' C, C ' A is orthogonal can to obtain A ' B, B with reason. Make X-axis along A ' B direction, Y-axis along B ' C direction, Z axle along C ' A direction, can meet high resistance line and X, Y, Z tri-axle be 54.7 °, and X, Y, Z tri-axles are mutually vertical. And then can meet in IEEE-1309 standard, the support bar of radio-frequency electromagnetic Field probe i.e. high resistance line part need with X, Y, Z tri-axle become 54.7 °, and X, Y, Z tri-orthogonal requirement of axle.

Omni-directional probe described in the embodiment of the present invention, by the set-up mode of three pieces of circuit cards and dipole antenna, meet IEEE-1309 standard, the support bar of radio-frequency electromagnetic Field probe, namely high resistance line part need with X, Y, Z tri-axle all become 54.7 °, and X, Y, Z tri-orthogonal requirement before axle. meanwhile, owing to employing the dipole antenna that the embodiment of the present invention provides. in this dipole antenna, antenna body is divided into multistage sub antenna, and the width of each cross-talk antenna is reduced to the other end gradually by one end of antenna body, simultaneously, connect to get up by contact resistance by between adjacent sub antenna, and the resistance of contact resistance is reduced to the other end gradually by one end of antenna body, dipole antenna is made can better to receive the electromagnetic field signal of different frequency, add the equivalent length of dipole antenna, expand the survey frequency scope of probe, the frequency particularly improving low-frequency range rings characteristic, realize better being received by broadband electromagnetic field signal.

In addition, shown in Fig. 2 and Fig. 3, in the omni-directional probe that the embodiment of the present invention provides, the dipole antenna 30 on circuit card 20 described in each all has two;

The axis of two described dipole antennas 30 is on same bar straight line;

On two described dipole antennas 30, the first end of antenna body 10 is close to each other, and is connected by Schottky detector diode 40 between the described sub antenna 101 of the first end of described antenna body 10.

When specific implementation, omni-directional probe is generally used on electromagnet radiation detection instrument, electromagnet radiation detection instrument utilizes antenna to carry out the electromagnetism signal of detection space environment, signal is after wave-detector detection, amplified by operational amplifier again, signal after amplification is converted to numerary signal through analog to digital converter (A/D) by simulating signal, and obtains electromagnetic field intensity values after this numerary signal is carried out data processing, finally shows with the form of digital quantity.And Schottky detector diode is exactly the wave-detector in this whole process. The omni-directional probe that the embodiment of the present invention provides, utilizes the electromagnetism signal of dipole antenna induction space environment exactly, then by Schottky detector diode, signal is carried out detection, and the electromagnetism signal recorded by dipole antenna is converted into voltage amount. On two dipole antennas, wider sub antenna 101 (sub antenna being namely positioned on antenna body first end) and two terminal connection of Schottky detector diode.

In addition, during the omni-directional provided in the embodiment of the present invention is popped one's head in, it may be preferred that described antenna body 10 is arranged on the side of described circuit card 20 near other described circuit card 20;

Described contact resistance 102 and described Schottky detector diode 40 are arranged on the side of described circuit card 20 away from other described circuit card 20.

Generally, contact resistance 102 and Schottky detector diode 40 are arranged on the side of circuit card 20, antenna body 10 is arranged on another side of circuit card 20, like this, it is arranged on the side identical with antenna body 10 relative to by contact resistance and Schottky detector diode 40, space can be saved, reduce the size of omni-directional probe.

Shown in Fig. 2 and Fig. 3, during the omni-directional that the embodiment of the present invention provides is popped one's head in, on two described dipole antennas 30, two connection terminals near described Schottky detector diode 40 connect a high resistance resistor chain 60 respectively by electric capacity 50.

When specific implementation, Schottky detector diode 40 has detection characteristic, coordinates electric capacity 50, it is possible to (radio frequency) sensed by antenna body exchanges signal and be converted to direct current signal, i.e. detection. The radiofrequency signal that dipole antenna (antenna body) receives, produces induced current, and induced current, by being converted into exchange (radio frequency) voltage after contact resistance, obtains the detection voltage of direct current after Schottky detector diode and electric capacity.

In addition, in order to avoid the signal on two two high resistance resistor chains 60 to cause interference each other, the high resistance resistor chain 60 that dipole antenna 30 described with two is connected respectively lays respectively at the both sides of described circuit card 20, and two described height resistance resistor chains are symmetrical arranged along described circuit card.

In addition, the described axis of height resistance resistor chain 60 and the axes normal of described dipole antenna 30. High resistance resistor chain 60 is perpendicular to dipole antenna 30 so that dipole antenna 30 Received signal strength better, reduce because of height hinder resistor chain 60 existence and to the interference of dipole sub antenna 30.

Shown in Fig. 2 and 3, in the omni-directional probe that the embodiment of the present invention provides, described height resistance resistor chain is also connected with high resistance line 70 away from one end of described electric capacity.

Preferably, described height resistance line 70 is attached on flexible PCB. Flexible PCB is the circuit card possessing certain elastic deformation ability actually, after being that high resistance resistor chain 60 connects, it is possible to bend to a radian, after the bearing of trend of triangular prism extends, be connected with the operational amplifier of electromagnet radiation detection instrument. And high resistance resistor chain 60 actually should hinder line 70 with height and forms an entirety, or say that high resistance resistor chain 60 is a part for high resistance line 70 actually, use the scheme that the high resistance line 70 of high resistance resistor chain 60 and flexibility combines, instead of all with flexible high resistance line, can so that high resistance resistor chain 60 be perpendicular to antenna near dipole antenna 30 place like this, reduce and antenna is affected, after pulling open certain distance, connect flexible high resistance line again, while convenient installation, expand the bandwidth of operation of probe, promote low frequency characteristic.Further, high resistance line is attached to flexible PCB so that resistance is uniformly distributed, and than traditional scheme realizing high resistance line with resistor chain, advantageously rings characteristic in the frequency widening probe.

Shown in Figure 6, the omni-directional probe that the embodiment of the present invention provides, also comprises: base 80;

Described base 80 is provided with card groove 90; Described circuit card 30 is installed in described card groove 90. Thus realizing circuit plate 30 is fixing.

The useful effect of the present invention:

1) meet IEEE-1309 standard, support bar i.e. high resistance line part need with X, Y, Z tri-axle be 54.7 °, and X, Y, Z tri-axles are mutually vertical.

2) probe realized is convenient to be installed, and ensures angle.

3) segmentation of dipole antenna is welded on the circuit card of rectangle, and the width of sub antenna attenuates from center gradually to both sides, expands the survey frequency scope of probe, and the frequency particularly improving low-frequency range rings characteristic, it is achieved better received by broadband electromagnetic field signal.

4) connecting with contact resistance between sub antenna, resistance reduces from center gradually to both sides, makes dipole antenna receive the electromagnetic field signal of different frequency better, expands the survey frequency scope of probe.

5) high resistance line is flexible PCB so that resistance is uniformly distributed, and than traditional scheme realizing high resistance line with resistor chain, advantageously rings characteristic in the frequency widening probe.

6) dipole antenna is connected by high resistance resistor chain with high resistance line, and the high resistor chain that hinders is perpendicular to dipole antenna so that dipole antenna Received signal strength better, reduction because of resistor chain existence and to the interference of dipole sub antenna.

7) high resistance resistor chain is a part for high resistance line, use the scheme that resistor chain and flexible high-resistance line combine, instead of all use flexible high-resistance line, it is being perpendicular to antenna near dipole antenna place like this, is reducing antenna impact, after pulling open certain distance, connect flexible PCB height resistance line again, while convenient installation, expand the bandwidth of operation of probe, promote low frequency characteristic.

The above; it is only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, any it is familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention. Therefore, protection scope of the present invention should described be as the criterion with the protection domain of claim.

Claims (10)

1. a dipole antenna, it is characterised in that, comprising: antenna body;

Described antenna body comprises multistage sub antenna;

The axis of sub antenna described in multistage is all on same bar straight line, and in two often adjacent described sub antennas, the width near the sub antenna of the first end of described antenna body is greater than the width of the sub antenna of the 2nd end near described antenna body;

Every section of described sub antenna is all connected with contact resistance away from the end of the first end of described antenna body;

Adjacent described sub antenna is all connected by described contact resistance;

In two often adjacent described contact resistances, the resistance near the contact resistance of the first end of described antenna body is greater than the resistance of the contact resistance of the 2nd end near described antenna body.

2. an omni-directional probe, it is characterised in that, comprising: three pieces of circuit cards;

Three pieces of described circuit cards connect between two, form an equilateral triangular prism, and three pieces of described circuit cards are respectively three sides of described equilateral triangular prism;

Circuit card described in every block is provided with dipole antenna as claimed in claim 1;

Angle between the axis of described antenna body and the incline of described equilateral triangular prism is 54.7 °.

3. omni-directional according to claim 2 probe, it is characterised in that, the dipole antenna on circuit card described in each all has two;

The axis of two described dipole antennas is on same bar straight line;

On two described dipole antennas, the first end of antenna body is close to each other, and is connected by Schottky detector diode between the described sub antenna of the first end of described antenna body.

4. omni-directional according to claim 3 probe, it is characterised in that, described antenna body is arranged on the side of described circuit card near other described circuit card;

Described contact resistance and described Schottky detector diode are arranged on the side of described circuit card away from other described circuit card.

5. omni-directional according to claim 4 probe, it is characterised in that, on two described dipole antennas, two connection terminals near described Schottky detector diode connect a high resistance resistor chain respectively by electric capacity.

6. omni-directional according to claim 5 probe, it is characterised in that, the high resistance resistor chain that dipole antenna described with two is connected respectively lays respectively at the both sides of described circuit card, and two described height resistance resistor chains are symmetrical arranged along described circuit card.

7. omni-directional according to claim 6 probe, it is characterised in that, the described axis of height resistance resistor chain and the axes normal of described dipole antenna.

8. omni-directional according to claim 7 probe, it is characterised in that, described height resistance resistor chain is also connected with high resistance line away from one end of described electric capacity.

9. omni-directional according to claim 8 probe, it is characterised in that, described height resistance line is attached on flexible PCB.

10. according to claim 2-9 any one omni-directional probe, it is characterised in that, also comprise base;

Described base is provided with card groove; Described circuit card is installed in described card groove.