CN110277647B - Antenna for secret communication - Google Patents
Antenna for secret communication Download PDFInfo
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- CN110277647B CN110277647B CN201910485781.0A CN201910485781A CN110277647B CN 110277647 B CN110277647 B CN 110277647B CN 201910485781 A CN201910485781 A CN 201910485781A CN 110277647 B CN110277647 B CN 110277647B
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- 238000004891 communication Methods 0.000 title claims abstract description 20
- 230000005855 radiation Effects 0.000 claims abstract description 60
- 238000010586 diagram Methods 0.000 claims abstract description 8
- 230000005404 monopole Effects 0.000 claims description 25
- 239000000523 sample Substances 0.000 claims description 19
- 239000004020 conductor Substances 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 description 16
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000010287 polarization Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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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
-
- 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
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
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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
-
- 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
-
- 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
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
-
- 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
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
- H01Q5/321—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors within a radiating element or between connected radiating elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/045—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
- H01Q9/40—Element having extended radiating surface
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- Variable-Direction Aerials And Aerial Arrays (AREA)
- Waveguide Aerials (AREA)
Abstract
The invention discloses an antenna for secret communication, which is characterized by being applicable to very high frequency/ultrahigh frequency wave bands, comprising an antenna structure which works at the same frequency and generates a noise radiation zero point directional diagram and a sequence feed structure for realizing directional circularly polarized radiation, wherein the direction is the direction of the noise radiation zero point; and a sequence feed structure is arranged between the floor and the disc and is connected with the radiation patch for feeding. The invention has simple structure and can meet the requirement of secret communication without forming an array.
Description
Technical Field
The invention relates to the field of communication antennas, in particular to an antenna for secret communication.
Background
Nowadays, with the rapid development of wireless communication technology, information security becomes more and more important. In order to ensure security and confidentiality of information transmission, secure communication is an important data transmission protection means, and plays an increasingly important role in the field of information security. The traditional method for increasing the security of wireless communication mainly focuses on various digital coding technologies, but with the rapid development of the computer field, more and more algorithms for coding and decoding and higher efficiency are adopted, so that the traditional method for coding and secrecy is seriously impacted.
In fact, the most efficient method for realizing secure communication is to cover the secure information to be transmitted only on the designated space, and other spaces generate interference by sending noise signals, so as to prevent the secure information from being stolen. To realize such data transmission, a specific transmitting antenna is usually required, and a phased array antenna with high directivity is proposed in documents r.y.miyamoto, g.s.shiroma, and w.a.shiroma, "a high-directivity transponder using self-steering array," ieee MTT-S int.microw.symp.dig., Fort Worth, TX, jun.2004, pp.1683-1686 to realize data transmission of secret communication. The antenna consists of a 2 x 2 array of antennas, one antenna for transmitting the security signal to be transmitted and the other antenna for transmitting the noise signal to interfere with the spy receiver. The antenna for transmitting the secret signal has the maximum transmission power in the designated receiving direction, and the gain of the antenna for transmitting the noise signal in the direction is almost zero, so that a high signal-to-noise ratio in the receiving direction is ensured, and the received secret information is easy to demodulate from the noise signal. A 3 x 4 array antenna was studied, each antenna pair comprising one sub-array for data transmission and two sub-arrays for noise loading. The antenna realizes data transmission with high signal-to-noise ratio of a secret channel, and a non-receiving channel realizes anti-eavesdropping interference by loading noise, thereby ensuring the safety of data transmission. In the method for realizing the noise zero transmission, the antenna adopts a novel design, so that the data transmission of the confidential channel has higher signal-to-noise ratio, and finally the antenna realizes the antenna performance that the signal-to-noise ratio is higher than 25dB at a scanning angle of +/-27 degrees, and can well meet the application of GSM 1800.
The prior art has the following defects:
(1) the antenna is an array antenna, the number of antenna units is large, the size is large, the manufacturing cost is high, a power divider and a phase shifter need to be designed for a feed network part of the unit, and the design process is complex.
(2) The two designs respectively realize the emission of noise signals and secret signals through two types of antennas, the integration level of the antennas is low, the miniaturization is difficult to realize, and the miniaturization application of a very high frequency/ultrahigh frequency wave band is difficult to meet.
Disclosure of Invention
In order to overcome the defects and shortcomings of the prior art, the invention provides the antenna for secret communication, which has the characteristics of high directionality, high signal-to-noise ratio and capability of simultaneously radiating two different radio frequency powers by using a single antenna.
The secure communication is realized by ensuring that the secure signal is completely covered in a fixed direction or a fixed area, and the interference of the eavesdropping antenna is realized by loading noise in other directions or areas, so that the transmitted useful signal can be well ensured to be received by the fixed area, and only the noise signal can be received by other areas.
The invention adopts the following technical scheme:
an antenna for secret communication comprises an antenna structure for generating a noise radiation zero point directional diagram and a sequence feed structure for realizing directional circularly polarized secret signal radiation, wherein the antenna structure and the sequence feed structure work at the same frequency, and the direction is the direction of the noise radiation zero point.
The antenna structure comprises a monopole radiator, wherein a disc is loaded at the top end of the monopole radiator, a floor is loaded at the bottom end of the monopole radiator, a radiation patch is arranged on the upper surface of the disc, and a gap or a capacitor for adjusting frequency is loaded on the radiation patch; and a sequence feed structure is arranged between the floor and the disc and is connected with the radiation patch for feeding.
The sequence feed structure is a two-element orthogonal feed structure, a three-element sequence feed structure, a four-element sequence feed structure and a five-element sequence feed structure.
The sequence feed structure is specifically a ternary sequence feed structure and comprises three feed probes and a coaxial line, wherein the three feed probes are arranged around the center of a disc at equal intervals, the adjacent feed amplitudes are equal, the feed phase difference is 120 degrees, and the three feed probes are used for generating circularly polarized radiation waves.
And the center of the disc and the top end of the feed probe are loaded.
The antenna structure generating the noise radiation zero point directional diagram is specifically a monopole antenna or a dipole antenna.
The floor is circular in shape.
The feeder line is a copper strip.
The invention has the beneficial effects that:
(1) the invention realizes two radiation characteristics on one antenna, effectively reduces the volume of the antenna and reduces the cost of the antenna.
(2) The invention has strong directivity, and can effectively change the signal-to-noise ratio of transmission signals in different directions by changing the power of two kinds of radiation feed so as to be suitable for different application scenes.
Drawings
FIG. 1 is a block diagram of a monopole in the prior art;
FIG. 2 is the antenna pattern of FIG. 1;
FIG. 3 is a schematic structural view of the present invention;
FIG. 4 is a top view of the present invention;
FIG. 5 is a ternary sequence fed circularly polarized antenna radiation pattern;
fig. 6 is the antenna radiation pattern for the present invention when Phi is 0 deg.;
fig. 7 is a graph of antenna directivity (signal-to-noise ratio) of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited to these examples.
Examples
In order to realize the secure communication, it is necessary to ensure that the fixed direction or the fixed area completely covers the secure signal, and the other directions or areas realize the interference to the wiretapping antenna by loading noise, so that it is well ensured that the transmitted useful signal is received by the fixed area, and the other areas can only receive the noise signal.
To achieve such an objective, the designed antenna needs to implement two-part functions, the first part is a directional diagram for implementing a noise radiation zero point, and is used for zero noise loading in a specified direction, so as to ensure that signals in the direction can be transmitted with a high signal-to-noise ratio; the second part is to implement a directional circularly polarized radiation pattern to specify the transmission of secret signals in one direction, while the other direction is covered by noise. The two parts share one antenna structure, and simultaneously realize the transmission of noise signals and encrypted signals.
The antenna for the secret communication is suitable for a very high frequency/ultrahigh frequency band, and comprises an antenna structure which works at the same frequency and generates a noise radiation zero point directional diagram and a sequence feed structure for realizing directional circular polarization radiation, wherein the direction is the direction of the noise radiation zero point.
In the prior art, a dipole antenna or a monopole antenna is adopted to realize a radiation zero point directional pattern, as shown in fig. 1, a conventional monopole antenna is composed of a line radiator 1 and a floor 2, and a directional pattern as shown in fig. 2 can be generated by feeding through a coaxial line 3. In the normal direction of the antenna, the antenna will generate a radiation null, from which almost no electromagnetic waves will radiate, while in other directions the antenna will radiate. If a dipole or monopole antenna is used to transmit the noise signal, the antenna radiator need only be directed to a fixed location or area, which is hardly disturbed by the noise signal and can be used well for the transmission of the security signal. And because the monopole antenna has gain in other directions, the non-transmission area of the secret signal is covered by the noise signal, and the eavesdropping antenna can be well interfered.
However, the conventional monopole antenna has a too high profile and is not suitable for vhf/uhf band applications. In addition, to realize secure communication, two radiation performances (zero noise radiation and directional circularly polarized signal radiation) need to be realized on one antenna structure, and the conventional monopole antenna has a simple structure and cannot realize the second signal radiation, so that a new monopole antenna structure needs to be adopted for realization.
A disc-loaded monopole antenna is adopted, a coaxial probe penetrates through the ground to feed from the center of the disc, an outer conductor of the coaxial line is connected with the ground, an inner conductor is in contact with a radiation patch on the top disc, and a vertical current on the probe can generate a radiation zero-point directional diagram similar to that of figure 2. The design has the advantages that the section of the monopole antenna can be reduced because the disc loading at the top can generate the capacitance to the ground; in addition, the loading of the disc provides a good structural basis for realizing the circularly polarized radiation of the sequence feed, and two radiation performances under one antenna structure are easy to realize.
As shown in fig. 3, the antenna of the present invention, which generates a noise radiation zero pattern and operates at the same frequency, includes a monopole radiator 7 of a monopole antenna, a disc is loaded on the top end of the monopole radiator, the bottom end of the antenna is a metal mounting surface 10, a lower substrate 8 is disposed above the metal mounting surface, the metal mounting surface and the lower substrate are separated by an assembly screw 9, a circular metal layer is printed on the upper surface of the lower substrate to serve as a floor 2 of the antenna, and a copper wire 12 is printed on the lower surface of the lower substrate to serve as a feeder. A radiation patch 4 is arranged on the upper surface of the disc 5, and a gap or a capacitor 6 for adjusting frequency is loaded on the radiation patch; and a sequence feed probe 13 is arranged between the floor and the disc and connected with the radiation patch for feeding so as to realize a circularly polarized antenna.
The sequence feed structure can be a two-element orthogonal feed structure, a three-element sequence feed structure, a four-element sequence feed structure and a five-element sequence feed structure and is used for generating circularly polarized radiation waves.
This embodiment adopts ternary sequence feed structure, including three sequence feed probe 13 and coaxial line, three feed probe is put around disc center equidistant, and the feed amplitude of adjacent probe equals, feed phase difference 120 degrees, and the outer conductor of coaxial line is connected with the floor, and the inner conductor passes through the feeder to be connected with the feed probe, and the feed probe is connected with top radiation paster.
The three coaxial probes 11 are respectively arranged around the center of the disc at equal intervals, the phases of adjacent feeding points are sequentially lagged by 120 degrees in the clockwise rotation direction, and the feeding amplitudes are the same, so that the normal left-handed circularly polarized (LHCP) radiation can be realized, the radiation pattern is shown in figure 5, secret signals can be emitted in a directional mode through the circularly polarized antenna, and the signal coverage of a certain area is realized.
As shown in fig. 7, the present invention realizes the transmission of two radio frequency signals on the same antenna, and the isolation between the two signals is very important. In the invention, signal energy generated by the monopole antenna port is streamed to three feed ports of the circularly polarized antenna in phase, but as the circular polarization is fed by a ternary sequence, the phase difference of each port is 120 degrees, as shown in fig. 4, 14 represents 0-degree feed, 15 represents 120-degree feed, and 16 represents 240-degree feed, the energy of the streamed signal is naturally offset after reaching the circularly polarized antenna port, and good natural isolation is formed.
Finally, as shown in fig. 4, in order to make both radiation characteristics operate in the required frequency band, frequency modulation can be achieved by slotting the top disk or loading a capacitor, and specifically, frequency modulation can be achieved by adjusting the size of the arc portion of the disk slot and the radial slotting depth, in this embodiment, the slot is an arc slot, and is surrounded around the center point of the radiation patch at equal intervals.
The zero radiation pattern and the circularly polarized directional radiation pattern can be generated by respectively feeding at a central point and feeding at equidistant points which are deviated from the center by a certain distance through the ternary sequence, and the patterns generated by the two feeding modes are shown in figure 6. The solid part is the directional radiation gain of circular polarization, and the dotted part is the zero radiation gain of monopole antenna. In practical applications, circularly polarized radiation is used to transmit the security signal and monopole zero radiation is used to transmit the noise signal. As can be seen from fig. 6, the antenna can achieve good coverage of the secret signal in the area with the pitch angle ± 40 °, and the noise signal is almost zero, while the other areas are covered interference noise. The spatial signal-to-noise ratio distribution is shown in fig. 7. In addition, the control of the signal-to-noise ratio of the antenna can be realized by changing the feed power of two kinds of radiation, and the calculation formula of the signal-to-noise ratio is as follows:
the antenna structure of the invention adopts a disc-loaded monopole antenna, circularly polarized radiation waves are realized through a ternary sequence feed structure, two radiation patterns can be realized on a single antenna, and the invention has good practical application.
The invention has simple structure, and can meet the requirement of secret communication without forming an array; compared with other antennas for realizing secret communication, the invention can realize two radiation characteristics on a single antenna, thereby reducing the volume of the antenna and the cost of the antenna. The signal-to-noise ratio of the transmitted signal can be changed by controlling the feed power of the antenna, and very strong directionality can be realized.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (6)
1. An antenna for secret communication is characterized by comprising an antenna structure for generating a noise radiation zero point directional diagram and a sequence feed structure for realizing directional circularly polarized secret signal radiation, wherein the antenna structure and the sequence feed structure work at the same frequency, and the direction is the direction of the noise radiation zero point;
the antenna structure comprises a monopole radiator, wherein a disc is loaded at the top end of the monopole radiator, a floor is loaded at the bottom end of the monopole radiator, a radiation patch is arranged on the upper surface of the disc, and a gap or a capacitor for adjusting frequency is loaded on the radiation patch; a sequence feed structure is arranged between the floor and the disc and is connected with the radiation patch for feeding;
the sequence feed structure is a two-element orthogonal feed structure, a three-element sequence feed structure, a four-element sequence feed structure and a five-element sequence feed structure.
2. The antenna of claim 1, wherein the sequential feed structure is a ternary sequential feed structure, and comprises three feed probes and a coaxial line, the three feed probes are arranged around the center of the disc at equal intervals, the adjacent feed probes have equal feed amplitudes and 120 degrees feed phase difference, and are used for generating circularly polarized radiation waves, an outer conductor of the coaxial line is connected with the floor, an inner conductor of the coaxial line is connected with the feed probes through the feed lines, and the feed probes are connected with the top radiation patches.
3. The antenna of claim 1, wherein the center of the disk is loaded with the feed probe tip.
4. The antenna according to claim 1, characterized in that the antenna structure generating a noise radiation null pattern is embodied as a monopole antenna or a dipole antenna.
5. An antenna according to claim 1, characterized in that the floor is embodied as a circular shape.
6. The antenna of claim 2, wherein the feed line is a copper strip.
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| CN201910485781.0A CN110277647B (en) | 2019-06-05 | 2019-06-05 | Antenna for secret communication |
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| CN110277647B true CN110277647B (en) | 2020-10-27 |
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| CN112909580B (en) * | 2021-01-26 | 2021-11-02 | 华南理工大学 | Low-profile circularly polarized equal-flux antenna module |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5731205A (en) * | 1980-08-04 | 1982-02-19 | Oki Electric Ind Co Ltd | Antenna |
| CN1579036A (en) * | 2002-06-27 | 2005-02-09 | 松下电器产业株式会社 | Antenna device |
| CN101110499A (en) * | 2007-08-30 | 2008-01-23 | 大连海事大学 | Antenna apparatus of BGAN system portable terminal |
| CN103066379A (en) * | 2013-01-18 | 2013-04-24 | 西安电子科技大学 | Broad band low profile conic sleeve monopole antenna |
| CN109494458A (en) * | 2018-10-12 | 2019-03-19 | 重庆大学 | A kind of compact vertical polarized antenna of the low section of directional diagram reconstructable |
| CN208862173U (en) * | 2018-10-31 | 2019-05-14 | 南通至晟微电子技术有限公司 | Double frequency-band millimeter wave antenna |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9496620B2 (en) * | 2013-02-04 | 2016-11-15 | Ubiquiti Networks, Inc. | Radio system for long-range high-speed wireless communication |
| CN201797036U (en) * | 2010-05-05 | 2011-04-13 | 东南大学 | Double-frequency dual-polarized printed antenna |
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2019
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5731205A (en) * | 1980-08-04 | 1982-02-19 | Oki Electric Ind Co Ltd | Antenna |
| CN1579036A (en) * | 2002-06-27 | 2005-02-09 | 松下电器产业株式会社 | Antenna device |
| CN101110499A (en) * | 2007-08-30 | 2008-01-23 | 大连海事大学 | Antenna apparatus of BGAN system portable terminal |
| CN103066379A (en) * | 2013-01-18 | 2013-04-24 | 西安电子科技大学 | Broad band low profile conic sleeve monopole antenna |
| CN109494458A (en) * | 2018-10-12 | 2019-03-19 | 重庆大学 | A kind of compact vertical polarized antenna of the low section of directional diagram reconstructable |
| CN208862173U (en) * | 2018-10-31 | 2019-05-14 | 南通至晟微电子技术有限公司 | Double frequency-band millimeter wave antenna |
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