CN112467350A - Directional diagram reconfigurable antenna based on non-Foster circuit loading - Google Patents
Directional diagram reconfigurable antenna based on non-Foster circuit loading Download PDFInfo
- Publication number
- CN112467350A CN112467350A CN202011294720.5A CN202011294720A CN112467350A CN 112467350 A CN112467350 A CN 112467350A CN 202011294720 A CN202011294720 A CN 202011294720A CN 112467350 A CN112467350 A CN 112467350A
- Authority
- CN
- China
- Prior art keywords
- antenna
- parasitic
- foster
- directional diagram
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
-
- 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
- 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
Landscapes
- Aerials With Secondary Devices (AREA)
Abstract
The invention relates to a directional diagram reconfigurable antenna based on non-Foster circuit loading, and belongs to the technical field of wireless communication. The antenna includes a non-foster circuit and a parasitic array antenna; the parasitic array antenna adopts a binary array antenna and specifically comprises a parasitic unit and a driving unit; the non-Foster circuit is loaded on the parasitic element; the parasitic array antenna is used for converting signals into electromagnetic waves to be radiated, and a directional radiation directional diagram is generated. The antenna of the invention can improve the instantaneous bandwidth of the antenna and realize the directional diagram scanning of the antenna by loading the non-Foster circuit on the parasitic element and adjusting the non-Foster load. The non-foster circuit may be implemented by a negative impedance transformer.
Description
Technical Field
The invention belongs to the technical field of wireless communication, relates to the field of antenna technology and radio frequency circuits, and particularly relates to a directional pattern reconfigurable antenna based on non-Foster circuit loading.
Background
In recent years, in the field of wireless communication, spectrum resources and limited space resources are utilized effectively and reasonably to improve system capacity, increase system functions and prolong system bandwidth. The antenna plays an important role in the entire system, and thus, design research thereof becomes particularly important. In the current new generation of small volume, light weight, low cost requirements, antennas will work as much as possible in different environments depending on the application context or field of application. However, the development of the wireless system towards ultra-wideband, large capacity and multiple functions will bring about a significant increase in the number of antennas, which not only greatly increases the complexity of the wireless system, but also causes serious interference, so that the electromagnetic compatibility will be deteriorated, and the development of the wireless system will face a big "bottleneck" due to the restriction of the problems such as cost.
In this case, researchers have proposed reconfigurable antennas. The reconfigurable antenna can be divided into a frequency reconfigurable antenna, a directional diagram reconfigurable antenna, a frequency and directional diagram simultaneous reconfigurable antenna, a polarization reconfigurable antenna and the like according to functions. The directional diagram is an important characteristic of the antenna, and the antenna is required to have directional diagram controllability in systems such as military and civil radars, intelligent weapon guidance, wireless communication and the like, so that the directional diagram reconfigurable antenna is an important direction for research of the reconfigurable antenna. At present, the method for realizing the directional diagram reconfigurable antenna mainly comprises the following steps: (1) the antenna feeding mode adopts multi-feed-point feeding, and the phase of each feed point is changed, so that the radiation direction is changed; (2) by using the yagi antenna array, the radiation pattern of the antenna is changed by loading an adjustable element or a power switch; (3) by loading the reactive energy variable component or the electrically adjustable switch, the current distribution of the antenna is changed, so that the directional diagram is changed; (4) and changing the structure or the shape of the antenna by using a physical mechanical method to complete the change of the radiation pattern of the antenna.
The implementation methods of the directional diagram reconfigurable antenna are all passive schemes, and the phenomenon of narrow instantaneous bandwidth can occur when the directional diagram scanning is realized. Therefore, a new pattern reconfigurable antenna is needed to solve the above problems.
Disclosure of Invention
In view of the above, the present invention provides a directional pattern reconfigurable antenna based on non-foster circuit loading, which uses a parasitic array antenna to generate a directional radiation directional pattern, and since the parasitic array antenna generates a phase delay related to frequency during radiation, the maximum radiation angle of the antenna directional pattern changes with the change of frequency. A non-Foster circuit is adopted, and particularly, a negative impedance converter is used for offsetting the phase with a negative slope caused by propagation delay of a parasitic array antenna. The directional diagram reconfigurable antenna can improve the instantaneous bandwidth of the antenna and simultaneously realize directional diagram scanning of the antenna by loading the non-Foster circuit on the parasitic element and adjusting the non-Foster load.
In order to achieve the purpose, the invention provides the following technical scheme:
a non-foster circuit loading based pattern reconfigurable antenna comprising: non-foster circuits and parasitic array antennas; the parasitic array antenna adopts a binary array antenna and specifically comprises a parasitic unit and a driving unit; the non-foster circuit is loaded on the parasitic element;
the parasitic array antenna is used for converting signals into electromagnetic waves to be radiated, wireless transmission is achieved, and a directional radiation directional diagram is generated.
Furthermore, the non-Foster circuit is designed by adopting a negative impedance converter and consists of two transistors, a biasing circuit of the transistors, a stabilizing circuit and a parallel LC load.
Furthermore, the parasitic array antenna feeds electricity through a coaxial line, the parasitic unit or the driving unit adopts radiation patches, and the radiation patches on each unit are composed of 8 symmetrical semi-elliptical patches, so that the radiating capacity of the antenna is improved, and the antenna has better impedance matching characteristics; the overall height h of the antenna is 45cm, the width d of the antenna unit is 24cm, and the distance between the array units is optimized through HFSS software to ensure the coupling between the arrays.
Further, the parasitic array antenna is vertically fixed on a reflecting plate, and the diameter D of the reflecting plate is 100 cm.
Furthermore, the negative impedance converter adopts a grounding type design, the type of the adopted transistor is NE68133, and the load is a parallel inductor and a capacitor and is used for generating a reflection phase with a positive slope and offsetting a delay phase with a negative slope generated by a parasitic antenna; the load capacitance is variable capacitance, the variable capacitance diode generates adjustable capacitance, the reflection phase of the non-Foster circuit is changed by changing the load, and the current distribution of the antenna is changed, so that directional diagram scanning is realized; a stabilizing circuit is arranged in the circuit to ensure the working stability of the negative impedance converter.
The invention has the beneficial effects that: the invention solves the problems that the instantaneous bandwidth is narrow and the maximum radiation angle of the directional diagram can change along with the frequency when the directional diagram is scanned. The radiating surface of the antenna is enlarged by using the radiating patches of each antenna unit of the parasitic array antenna and adopting 8 symmetrical semi-elliptical patches, so that the radiating capacity of the antenna is improved, and the antenna has better impedance matching characteristic; then loading the non-Foster circuit on a parasitic unit of the parasitic array antenna, and offsetting a reflection phase with a positive slope generated by the non-Foster circuit and a transmission phase with a negative slope of the array antenna to enable the total phase of the antenna to tend to be a straight line in the whole working frequency band, so that the maximum radiation direction of a radiation pattern of the antenna in the working frequency band is basically kept unchanged; meanwhile, the directional diagram scanning can be realized by adjusting the capacitance value of the load capacitor. The invention is conventionally applied to ultrashort wave communication, and the maximum radiation angle of a radiation pattern of an antenna can be scanned from 90 degrees to about 60 degrees after a non-Foster circuit is loaded. The antenna of the invention realizes the broadband of the antenna and the maximum radiation angle of the directional diagram does not change along with the frequency.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a block diagram of a non-Foster loaded pattern reconfigurable antenna of the present invention;
FIG. 2 is a schematic structural diagram of a parasitic array antenna according to the present invention;
FIG. 3 is a graph of a simulation of a parasitic array antenna of the present invention;
FIG. 4 is a schematic diagram of a simulation of a non-Foster circuit of the present invention;
fig. 5 is a simulation graph of a non-foster loaded pattern reconfigurable antenna of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
The invention provides a directional diagram reconfigurable antenna design applied to ultrashort wave communication, and the working frequency range is 180 MHz-350 MHz. The current directional diagram reconfigurable antenna is designed by adopting a passive scheme, the phenomenon of narrower instantaneous bandwidth can occur when the directional diagram scanning is realized, and the antenna can generate phase delay related to frequency in the radiation process, so that the maximum radiation angle of the directional diagram of the antenna can change along with the frequency, therefore, the invention adopts a non-Foster-loaded parasitic array antenna to improve the instantaneous bandwidth of the antenna, and simultaneously realizes a non-deflected directional diagram, namely, the maximum radiation direction of the directional diagram does not change along with the frequency. The present invention will be described in further detail with reference to fig. 1 to 5.
The radiating patches of each antenna unit of the parasitic array antenna adopt 8 symmetrical semi-elliptical patches to increase the radiating surface of the antenna, so that the radiating capacity of the antenna is improved, and meanwhile, the antenna has better impedance matching characteristics. The parasitic array antenna is composed of a driving unit and a parasitic unit, wherein the driving unit is active, the parasitic unit is passive, and the parasitic unit generates radiation through coupling with the driving unit, so that the antenna units have proper spacing to ensure sufficient coupling between the antenna units, and the distance between the antennas is usually optimized in electromagnetic simulation software HFSS.
Importing the simulation data of the parasitic array antenna into ANSYS Designer simulation software for joint simulation, wherein S (1,1) is the reflection coefficient of the parasitic array antenna loaded with the non-Foster circuit; and (3) pushing the data of the joint simulation into HFSS simulation software to check the directional diagram of the antenna, wherein GainTotal (dB) is the two-dimensional coordinate representation of the radiation directional diagram of the parasitic array antenna after a non-Foster circuit is loaded.
The non-foster circuit is implemented by a grounded negative impedance converter. The negative impedance converter is the core design of a non-Foster circuit, and realizes a negative capacitance or a negative inductance with non-Foster element characteristics by utilizing circuit equivalence, wherein the load of the negative impedance converter is that an inductance of 15nH is connected in parallel with a capacitance of 23pF, and the equivalent of the negative impedance converter is that an inductance of-15 nH is connected in series with a capacitance of-23 pF; the circuit is different in that the bases and the collectors of the two transistors are not directly connected but connected through a resistor, so that the stability of the circuit can be ensured by the circuit structure; and a design for optimizing the Q value of the circuit is arranged between the base electrode and the collector electrode.
According to the technical scheme, the design of the directional diagram reconfigurable antenna in the ultra-short wave communication field is optimized. The design firstly designs the parasitic antenna array, adopts a binary array structure, and then loads the non-Foster circuit on the parasitic unit of the parasitic antenna array. The design scheme improves the instantaneous bandwidth of the antenna and realizes a deflection-free directional diagram, namely, the maximum radiation direction of the directional diagram does not change along with the frequency.
Fig. 1 is a structural diagram of the non-foster loaded pattern reconfigurable antenna according to the present invention, which is composed of an antenna part and a circuit part, wherein the non-foster circuit is loaded on a parasitic element. The driving unit is arranged on the left side, the parasitic unit is arranged on the right side, and the non-Foster circuit is loaded on the parasitic unit.
Fig. 2 is a schematic structural diagram of a parasitic array antenna according to the present invention, the antenna is composed of two antenna elements, feeding is performed through a coaxial line, and a radiation patch on each element is composed of 8 symmetrical semi-elliptical patches. After the antenna structure is optimized in the HFSS, the whole height of the antenna is 45cm, the distance between two antenna units is 24cm, the diameter of the reflecting plate is 100cm, the width of each antenna unit is 24cm, and the size of the antenna can meet the matching and coupling characteristics of 180 MHz-350 MHz in a working frequency band.
Fig. 3(a) is a simulation graph of S11 and S21 of the parasitic array antenna according to the present invention, and it can be seen that S11 of the antenna is less than-5 dB in a frequency band of 180MHz to 350MHz, which substantially meets the radiation requirement of the antenna, and it can also be seen from S21 that the coupling characteristic of the antenna also meets the requirement. Fig. 3(b) is a phase diagram of S21 of the parasitic array antenna proposed by the present invention, and the simulation graph reflects the phase delay of the antenna propagation process.
Fig. 4 shows a simulation schematic diagram of a non-foster circuit according to the present invention, the non-foster circuit is composed of two transistors BJT1 and BJT2, wherein resistors R1, R2, R3 and R4 form a stable circuit, Rc1, Rbc1 and Re1 form a bias circuit of transistor BJT1, Rc2 and Rbc2 form a bias circuit of BJT2, and R5, R6, Cap2, R7 and Ind2 have the function of improving quality factor.
Fig. 5(a) and 5(b) are simulation graphs of the non-foster loaded directional diagram reconfigurable antenna provided by the invention, fig. 5(a) is an H-plane directional diagram corresponding to a load state 1, fig. 5(b) is an H-plane directional diagram corresponding to a load state 2, and the H-plane directional diagrams of simulation results are compared, so that it can be seen that the position of the maximum value of the directional diagram changes from 90 ° of the load state 1 to about 60 ° of the load state 2; and along with the change of the frequency, the maximum radiation angle of the directional diagram changes in the range of about 10 degrees, and the antenna beam without deflection is realized.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (8)
1. A non-foster circuit loading based pattern reconfigurable antenna, the antenna comprising: non-foster circuits and parasitic array antennas; the parasitic array antenna adopts a binary array antenna and specifically comprises a parasitic unit and a driving unit; the non-foster circuit is loaded on the parasitic element;
the parasitic array antenna is used for converting signals into electromagnetic waves to be radiated, and a directional radiation directional diagram is generated.
2. The pattern reconfigurable antenna of claim 1, wherein the non-Foster circuit is designed using a negative impedance transformer, consisting of two transistors, a biasing circuit for the transistors, a stabilizing circuit, and a parallel LC load.
3. The directional diagram reconfigurable antenna according to claim 1, wherein the parasitic array antenna is fed through a coaxial line, the parasitic element or the driving element adopts a radiating patch, and the radiating patch on each element is composed of 8 symmetrical semi-elliptical patches.
4. The pattern reconfigurable antenna according to claim 1 or 3, wherein the parasitic array antenna is vertically fixed on a reflection plate.
5. The pattern reconfigurable antenna according to claim 4, wherein the diameter D of the reflection plate is 100 cm.
6. The pattern reconfigurable antenna according to claim 1 or 3, characterized in that the overall height h of the parasitic array antenna is 45 cm.
7. The pattern reconfigurable antenna according to claim 1 or 3, characterized in that the center-to-center distance d between the parasitic element and the driving element is optimized by HFSS software.
8. The pattern reconfigurable antenna of claim 2, wherein the negative impedance transformer is of a grounded type design.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011294720.5A CN112467350A (en) | 2020-11-18 | 2020-11-18 | Directional diagram reconfigurable antenna based on non-Foster circuit loading |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011294720.5A CN112467350A (en) | 2020-11-18 | 2020-11-18 | Directional diagram reconfigurable antenna based on non-Foster circuit loading |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112467350A true CN112467350A (en) | 2021-03-09 |
Family
ID=74837107
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011294720.5A Pending CN112467350A (en) | 2020-11-18 | 2020-11-18 | Directional diagram reconfigurable antenna based on non-Foster circuit loading |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112467350A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113571913A (en) * | 2021-08-04 | 2021-10-29 | 重庆大学 | Active small electric transmitting antenna capable of breaking through Bode-Fano limit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103636122A (en) * | 2011-04-07 | 2014-03-12 | Hrl实验室有限责任公司 | Non-foster circuit |
| CN111146574A (en) * | 2019-12-31 | 2020-05-12 | 重庆邮电大学 | Miniaturized discone antenna based on non-Foster matching circuit |
-
2020
- 2020-11-18 CN CN202011294720.5A patent/CN112467350A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103636122A (en) * | 2011-04-07 | 2014-03-12 | Hrl实验室有限责任公司 | Non-foster circuit |
| CN111146574A (en) * | 2019-12-31 | 2020-05-12 | 重庆邮电大学 | Miniaturized discone antenna based on non-Foster matching circuit |
Non-Patent Citations (1)
| Title |
|---|
| MINU M. JACOB等: "Non-Foster Loaded Parasitic Array for Broadband Steerable Patterns", 《IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113571913A (en) * | 2021-08-04 | 2021-10-29 | 重庆大学 | Active small electric transmitting antenna capable of breaking through Bode-Fano limit |
| CN113571913B (en) * | 2021-08-04 | 2024-04-26 | 重庆大学 | Active electric small transmitting antenna breaking through Bode-Fano limit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Nair et al. | Reconfigurable antenna with elevation and azimuth beam switching | |
| US12095165B2 (en) | Three dimensional antenna array module | |
| CN1881685B (en) | Cross feed broadband printed Yagi antenna | |
| CN114744409B (en) | Ten-fold frequency-range dual-polarized strong-coupling phased array antenna loaded by resistive material | |
| CN108598691B (en) | Broadband wide-angle scanning phased-array antenna based on flat-plate long-slot antenna | |
| CN113097736B (en) | Novel frequency and wave beam reconfigurable antenna | |
| US8253629B2 (en) | Dielectric rod antenna and method for operating the antenna | |
| CN104638359A (en) | Conical four-arm sinuous antenna and polarization control method of antenna | |
| KR102030696B1 (en) | Beam steering antenna with reconfigurable parasitic elements | |
| CN109888485B (en) | Compact low-profile multi-beam microstrip antenna | |
| CN105305056A (en) | Microstrip antenna capable of electrical adjustment of beam direction and beam width | |
| CN112201944A (en) | FP resonant cavity antenna based on super-structure surface | |
| CN107482310B (en) | Directional diagram electric tuning linear polarization dipole antenna | |
| CN113594680A (en) | Circular polarization octave ultra-wideband antenna unit and array | |
| CN210806003U (en) | Dual-circularly-polarized-beam reconfigurable microstrip antenna | |
| CN210443662U (en) | Novel K-band high-gain metamaterial microstrip antenna | |
| CN103296398B (en) | Microstrip antenna with directional diagram capable of being reconstructed | |
| CN112467350A (en) | Directional diagram reconfigurable antenna based on non-Foster circuit loading | |
| CN207611859U (en) | A kind of directional diagram electricity line transfer polarized dipole and electrical sub-antenna | |
| CN115084872A (en) | Ultra-wide bandwidth scanning angle tightly-coupled phased array antenna | |
| CN201233952Y (en) | Reader antenna for non-stop charge system | |
| CN110739536B (en) | Half-mode Vivaldi antenna and miniaturized large-angle frequency scanning antenna array | |
| CN114447599B (en) | Electric scanning high-gain quasi-cone beam FP antenna based on multi-beam switching | |
| CN217035994U (en) | Optimized structure for removing clutter in small base station antenna | |
| Sun et al. | An aperture coupled microstrip patch antenna array for terahertz application |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210309 |
|
| RJ01 | Rejection of invention patent application after publication |