Patent Application
20210242600
The present disclosure relates to the technical field of antenna, and specifically, to a method and device for calculating directional pattern of a beam pointing adjustable antenna.
A waveguide-based beam pointing adjustable antenna (leaky-wave antenna) has advantages of low costs, long life, low profile, full shielding to eliminate complex internal scattering. Key factors for designing the beam pointing adjustable antenna includes: slot unit, slot spacing, slot arrangement, slot on and off control, etc. Among them, in order to achieve precise regulation of specific beam directions and low side-lobe control in a working frequency band, linkage optimization of the above-mentioned key factors is required.
A conventional design method for a beam pointing adjustable antenna having regular slots is relatively mature, factors such as slot size and spacing are related to directional pattern formed by the antenna, and the form is relatively intuitive. However, it does not have turning-on or cutting-off function, and cannot achieve beam pointing deflection.
A design method for a beam pointing adjustable antenna having irregular slots greatly depends on simulation software, global optimization takes a relatively long time, which is difficult for engineering applications.
For a beam-adjustable system, the principle of phased arrays is usually used for reference, and the array elements are the same. However, the beam control of the system is implemented through precise phase modulation of each array element. Compared with the beam pointing adjustable antenna having a plurality of slot units, the control mechanism is different. For the beam pointing adjustable antenna, it is difficult to provide guidance for turning-on or cutting-off each slot unit.
For the prior-art problems that beam pointing and deflection cannot be achieved, dependency on the simulation software is large, and it is difficult to provide guidance for turning-on or cutting-off each slot unit according to the phased array principle, no effective solution have been proposed.
For the prior-art problems that beam pointing and deflection cannot be achieved, dependency on the simulation software is large, and it is difficult to provide guidance for turning-on or cutting-off each slot unit according to the phased array principle, the present disclosure provides a method and device for calculating directional pattern of a beam pointing adjustable antenna, which can realize the weighted calculation of directional pattern of the beam pointing adjustable antenna without depending on simulation software, at the same time, various key parameters can be globally optimized, so as to realize the fast beam switching.
The technical solutions in the present disclosure are implemented as follows:
According to one aspect of the present disclosure, a method for calculating directional pattern of a beam pointing adjustable antenna is provided, the beam pointing adjustable antenna comprises a plurality of slot units, the method comprises the following steps:
S1. obtaining a scattering parameter matrix of a single-slot waveguide corresponding to a single slot unit and a transmission matrix of a seamless waveguide through measurement, and obtaining an equivalent transmission matrix of the single slot unit according to the scattering parameter matrix of the single-slot waveguide and the transmission matrix of the seamless waveguide;
S2. obtaining an arrangement and combination mode of the slot units and a beam pointing control code representing on or off state of each slot unit, and obtaining a transmission matrix cascading mode of the beam pointing adjustable antenna according to the arrangement and combination mode, the beam pointing control code, and an equivalent scattering parameter matrix of the single slot unit; and
S3. obtaining the directional pattern of the single-slot waveguide excited at the left end and the directional pattern of the single-slot waveguide excited at the right end, and obtaining a composite directional pattern of the beam pointing adjustable antenna according to the directional pattern of the single-slot waveguide excited at the left end, the directional pattern of the single-slot waveguide excited at the right end, and the transmission matrix cascading mode of the beam pointing adjustable antenna.
According to another aspect of the present disclosure, a device for calculating directional pattern of the beam pointing adjustable antenna is provided, the device comprises:
a slot transmission matrix obtaining module configured for: obtaining a scattering parameter matrix of a single-slot waveguide corresponding to a single slot unit and a transmission matrix of a seamless waveguide through measurement, and obtaining an equivalent transmission matrix of the single slot unit according to a total transmission matrix of the single-slot waveguide and the transmission matrix of the seamless waveguide;
an antenna transmission matrix obtaining module configured for: obtaining an arrangement and combination mode of the slot units and a beam pointing control code representing on or off state of each slot unit, and obtaining a transmission matrix cascading mode of the beam pointing adjustable antenna according to the arrangement and combination mode, the beam pointing control code, and an equivalent scattering parameter matrix of the single slot unit; and
an antenna directional pattern generating module configured for: obtaining the directional pattern of the single-slot waveguide excited at the left end and the directional pattern of the single-slot waveguide excited at the right end, and obtaining a composite directional pattern of the beam pointing adjustable antenna according to the directional pattern of the single-slot waveguide excited at the left end, the directional pattern of the single-slot waveguide excited at the right end, and the transmission matrix cascading mode of the beam pointing adjustable antenna.
In the present disclosure, the scattering parameter of the single slot unit is obtained through direct measurement, therefore, operability is strong or high, and directional pattern of the beam pointing adjustable antenna is calculated without depending on simulation software. In addition, the weighted calculation of directional pattern of the beam pointing adjustable antenna is realized. Key information including a form of the slot unit and arrangement and combination mode of the slot units can be globally optimized. Which greatly saves the optimization of slot unit selection, arrangement, combination, and spacing during antenna design, so as to focus on structural form of the slot unit. In addition, according to the beam pointing and deflection requirement, the corresponding beam pointing control codes for on and off states of each slot unit may be further calculated, so as to provide guidance for the regulation of the beam pointing and achieve fast beam shaping and switching.
To describe the technical solutions in the embodiments of the present disclosure or in the prior art more clearly, the following briefly describes the accompanying drawings required for describing the embodiments. Apparently, the accompanying drawings in the following description show merely some embodiments of the present disclosure, and a person of ordinary skill in the art may still derive other drawings from these accompanying drawings without creative efforts.
The following clearly and completely describes the technical solutions in the embodiments of the present disclosure with reference to the accompanying drawings in the embodiments of the present disclosure. Apparently, the described embodiments are merely some but not all of the embodiments of the present disclosure. All other embodiments obtained by a person of ordinary skill in the art according to the embodiments of the present disclosure shall fall within the protection scope of the present disclosure.
According to an embodiment of the present disclosure, a directional pattern calculation method for a beam pointing adjustable antenna is provided. Usually, the beam pointing adjustable antenna is also referred to as a leaky-wave antenna, and includes a plurality of slots that generate leaky waves.
As shown in
S101. obtaining a scattering parameter matrix of a single-slot waveguide corresponding to a single slot unit and a transmission matrix of a seamless waveguide through measurement, and obtaining an equivalent transmission matrix of the single slot unit according to the scattering parameter matrix of the single-slot waveguide and the transmission matrix of the seamless waveguide.
S103. obtaining an arrangement and combination mode of the slot units and a beam pointing control code representing on or off state of each slot unit, and obtaining a transmission matrix cascading mode of the beam pointing adjustable antenna according to the arrangement and combination mode, the beam pointing control code, and an equivalent scattering parameter matrix of the single slot unit.
S105. obtaining the directional pattern of the single-slot waveguide excited at the left end and the directional pattern of the single-slot waveguide excited at the right end, and obtaining a composite directional pattern of the beam pointing adjustable antenna according to the directional pattern of the single-slot waveguide excited at the left end, the directional pattern of the single-slot waveguide excited at the right end, and the transmission matrix cascading mode of the beam pointing adjustable antenna.
Furthermore, various electrical performance indicators of the array antenna can be evaluated, such as: beam pointing angle, main lobe 3 dB beam width, a first null width, a side lobe level, a front-to-rear ratio, etc.
The above technical solution of the present disclosure quantifies key control factors such as the arrangement and combination of multiple slot units, the slot unit spacing, and the wave control coding of the on and off states of the slot units, and evaluates the array antennas with different slot unit combinations and adjustments. The far-field pattern can be used to evaluate the electrical performance indicators of the array antenna; the weighted calculation of the beam pointing adjustable antenna pattern is realized; the key information including the slot unit form, the combination and arrangement of the slot unit can be performed Global optimization greatly saves the optimization of slot unit selection, arrangement, combination, and spacing in antenna design, so as to focus on the design of the slot unit structure; in addition, it can also calculate the corresponding slot unit according to the beam pointing and deflection requirements The wave control coding of the on and off states provides guidance for the adjustment of the beam pointing to achieve rapid beam shaping and switching.
In the present disclosure, the scattering parameter of the single slot unit is obtained through direct measurement, therefore, operability is strong or high, and directional pattern of the beam pointing adjustable antenna is calculated without depending on simulation software. In addition, the weighted calculation of directional pattern of the beam pointing adjustable antenna is realized. Key information including a form of the slot unit and arrangement and combination mode of the slot units can be globally optimized. Which greatly saves the optimization of slot unit selection, arrangement, combination, and spacing during antenna design, so as to focus on structural form of the slot unit. In addition, according to the beam pointing and deflection requirement, the corresponding beam pointing control codes for on and off states of each slot unit may be further calculated, so as to provide guidance for the regulation of the beam pointing and achieve fast beam shaping and switching.
In one embodiment, at step S101, obtaining the total transmission matrix of the single-slot waveguide corresponding to one slot unit may specifically include the following steps: simulating the single-slot waveguide to obtain the total scattering parameter of the single-slot waveguide; The total scattering parameter of the waveguide obtains the total transmission matrix of the single-slit waveguide.
In one embodiment, at step S101, obtaining the scattering parameter matrix of the single-slot waveguide through measurement specifically includes: obtaining the scattering parameter matrix of the single-slot waveguide by performing a two-port test on the single-slot waveguide.
In one embodiment, at step S101, obtaining the transmission matrix of the seamless waveguide specifically includes: obtaining an equivalent transmission line model of the seamless waveguide; and performing calculation according to the equivalent transmission line model of the seamless waveguide and transmission line matrix theory to obtain the transmission matrix of the seamless waveguide.
In one embodiment, at step S103, the arrangement and combination mode of the slot unit includes a spacing between the slot units, a form of the slot unit, or a combination of them.
In one embodiment, the step S105 specifically include: obtaining an equivalent input-to-output ratio of a single slot unit according to a transmission matrix of the beam pointing adjustable antenna; obtaining the directional pattern of the single-slot waveguide excited at the left end and the directional pattern of the single-slot waveguide excited at the right end; and obtaining the composite directional pattern according to the directional pattern of the single-slot waveguide excited at the left end, the directional pattern of the single-slot waveguide excited at the right end, and the equivalent input-to-output ratio of the single slot unit.
S201. Performing a two-port test on a single-slot waveguide to obtain a total scattering parameter Sn of n single-slot waveguides, wherein the total scattering parameter Sn includes a scattering parameter Sn1 of different slot units in the on state and a scattering parameter Sn0 of different slot units in the off state. In other words, the scattering parameter Sn=Sn1 of different slot units in the on state and the scattering parameter Sn=Sn0 of different slot units in the off state are measured by using the two-port test method.
S202. Obtaining the total transmission matrix of the single-slot waveguide according to the total scattering parameter Sn of the single-slot waveguide. The total transmission matrix includes transmission matrixes Tn1 and Tn0. Wherein, the transmission matrix Tn1 is obtained by conversion according to the scattering parameter Sn1 in the on state. The transmission matrix Tn0 is obtained by conversion according to the scattering parameter Sn0 in the off state.
S203. Obtaining an equivalent transmission line model of a seamless waveguide.
S204. Performing calculation according to the equivalent transmission line model of the seamless waveguide and transmission line matrix theory, to obtain a transmission matrix Tnd of the seamless waveguide.
S205. Obtaining an equivalent transmission matrix Ts of the slot unit according to the total transmission matrixes Tn1 and Tn0 of the single-slot waveguide and the transmission matrix Tnd of the seamless waveguide.
S206. Obtaining a beam pointing control code fln=1 indicating the on state of each slot unit or a beam pointing control code fln=0 indicating the off state of each slot unit.
S207. Obtaining arrangement and combination mode of a plurality of slot units and a spacing between slot units (denoted as do for a one-dimensional array, and denoted as dn1 and dnw for a two-dimensional array respectively).
S208. According to the arrangement and combination mode and the beam pointing control code, simulating a transmission matrix Ta of the beam pointing adjustable antenna in the form of a transmission matrix cascading mode.
S209. Calculating the equivalent input-to-output ratio of the single slot unit according to the transmission matrix Ta of the beam pointing adjustable antenna, that is, an input ratio a1n at an input end 1 of the nth slot unit in a two-port equivalent network in a single-port and unit-excitation case, and an input ratio a2n at an output end 2.
S210. Obtaining right end excitation directional pattern data Enr excited at the right end of the slot unit in the on and off states through measurement. The right end excitation directional pattern data Enr includes right end excitation directional pattern data Enr1 in the on state and right end excitation directional pattern data Enr0 in the off state.
S211. Obtaining left end excitation directional pattern data En1 excited at the left end of the slot unit in the on and off states through measurement. The left end excitation directional pattern data En1 includes left end excitation directional pattern data Enl1 in the on state and left end excitation directional pattern data Enl0 in the off state.
S212. Performing weighted calculation on the directional pattern of the beam pointing adjustable antenna according to the right end excitation directional pattern data, the left end excitation directional pattern data, and the equivalent input-to-output ratio of the single slot unit.
Among them, the order of steps S206 and S207 can be interchanged or performed simultaneously, and the order of steps S210 and S211 can also be interchanged or performed simultaneously.
In the directional pattern calculation method for a beam pointing adjustable antenna shown in
In one embodiment, the beam pointing adjustable antenna is a one-dimensional or two-dimensional array structure. The directional pattern calculation method for a beam pointing adjustable antenna in the present disclosure is applicable to a plurality of combinations of slot units, is applicable to both a one-dimensional array and a two-dimensional array, and therefore has relatively high value in engineering application.
In summary, in the present disclosure, the method for calculating directional pattern of beam pointing adjustable antenna is quantized by key control factors, for example, arrangement and combination mode of n slot units, a spacing between slot units (denoted as do for one-dimensional array, and denoted as dn1 and dnw for two-dimensional array), beam pointing control code (fln=1) for on state of the slot unit, and beam pointing control code (fln=0) for off state of the slot unit. The present disclosure evaluates far-field directional pattern of the array antenna controlled by different combination and adjustment of the slot units, and further evaluates the electrical performance indicators (for example, beam pointing angle, main-lobe beam width at 3 dB, first null width, side-lobe level, and front-to-rear ratio) of the array antenna. The scattering parameters in the on state (Sn=Sn1) and the off state (Sn=Sn0) of different slot units are extracted by measurement and other methods. The scattering parameter (Snd) is calculated with reference to the equivalent transmission line theory of the seamless waveguide of any length. After conversion, the transmission matrixes (Tn1, Tn0, and Tnd) are obtained, and the equivalent transmission matrix (Tn) of the slot unit is extracted. And then according to information of different slot units, slot unit spacing, and beam pointing control code, the transmission matrix is cascaded to simulate the total transmission characteristic (Ta) of the beam pointing adjustable antenna. The present disclosure then calculates an input ratio a1n of an input end 1, an input ratio a2n of an output end 2 under a two-port equivalent network of the nth slot unit and under a single-port and single-unit excitation. The present disclosure then directly measure the directional pattern data based on the left end and right end of various slot units that are separately excited, on and off states of each slot unit (En1 for left-end excitation includes Enl1 and Enl0, and Enr for right-end excitation includes Enr1 and Enr0).
Therefore, operability is strong or high, and directional pattern of the beam pointing adjustable antenna is calculated without depending on simulation software. In addition, the weighted calculation of directional pattern of the beam pointing adjustable antenna is realized. Key information including a form of the slot unit and arrangement and combination mode of the slot units can be globally optimized. Which greatly saves the optimization of slot unit selection, arrangement, combination, and spacing during antenna design, so as to focus on structural form of the slot unit. In addition, according to the beam pointing and deflection requirement, the corresponding beam pointing control codes for on and off states of each slot unit may be further calculated, so as to provide guidance for the regulation of the beam pointing and achieve fast beam shaping and switching.
As shown in
a slot transmission matrix obtaining module 310, configured for: obtaining a scattering parameter matrix of a single-slot waveguide corresponding to a single slot unit and a transmission matrix of a seamless waveguide through measurement, and obtaining an equivalent transmission matrix of the single slot unit according to a total transmission matrix of the single-slot waveguide and the transmission matrix of the seamless waveguide;
an antenna transmission matrix obtaining module 320, configured for: obtaining an arrangement and combination mode of the slot units and a beam pointing control code representing on or off state of each slot unit, and obtaining a transmission matrix cascading mode of the beam pointing adjustable antenna according to the arrangement and combination mode, the beam pointing control code, and an equivalent scattering parameter matrix of the single slot unit; and
an antenna directional pattern generating module 330, configured for: obtaining the directional pattern of the single-slot waveguide excited at the left end and the directional pattern of the single-slot waveguide excited at the right end, and obtaining a composite directional pattern of the beam pointing adjustable antenna according to the directional pattern of the single-slot waveguide excited at the left end, the directional pattern of the single-slot waveguide excited at the right end, and the transmission matrix cascading mode of the beam pointing adjustable antenna.
In one embodiment, the slot transmission matrix obtaining module 310 includes: a single-slot waveguide measurement submodule 312, configured for: performing a two-port test on the single-slot waveguide to obtain the scattering parameter matrix of the single-slot waveguide.
In one embodiment, the slot transmission matrix obtaining module 310 includes the following sequentially connected submodules: a seamless waveguide transmission model obtaining submodule (not shown) configured for: obtaining an equivalent transmission line model of the seamless waveguide; and a seamless waveguide transmission matrix obtaining submodule (not shown) configured for: performing calculation according to the equivalent transmission line model of the seamless waveguide and transmission line matrix theory, to obtain the transmission matrix of the seamless waveguide.
In an embodiment, the antenna directional pattern generating module 330 includes the following sequentially connected submodules: a slot unit equivalent input-output ratio obtaining submodule configured for: obtaining an equivalent input-to-output ratio of a single slot unit according to a transmission matrix of the beam pointing adjustable antenna; a single-slot waveguide directional pattern obtaining submodule configured for: obtaining the directional pattern of the single-slot waveguide excited at the left end and the directional pattern of the single-slot waveguide excited at the right end; and an antenna directional pattern generating submodule configured for: obtaining the composite directional pattern according to the directional pattern of the single-slot waveguide excited at the left end, the directional pattern of the single-slot waveguide excited at the right end, and the equivalent input-to-output ratio of the single slot unit.
In one embodiment, the beam pointing adjustable antenna is a one-dimensional or two-dimensional array structure.
The foregoing are merely preferred embodiments of the present disclosure, but are not intended to limit the present disclosure. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure shall fall within the protection scope of the present disclosure.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201810431836.5 | May 2018 | CN | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2018/124555 | 12/28/2018 | WO | 00 |
