CN-121997556-A - Radome antenna combination response rapid evaluation method based on spherical-domain generalized transmission line model

Abstract

The invention provides a radome antenna combination response rapid evaluation method based on a spherical-domain generalized transmission line model. The antenna housing is equivalent to a bidirectional spherical generalized transmission line by constructing a uniform spherical mode interface space, the antenna radiation behavior is represented as a spherical multiport response matrix, and the position and posture change of the antenna in the housing are described by utilizing an analyzed spherical geometric transformation operator. The two are combined in a cascading mode in a mode space, the directional diagram, the gain and the scattering sectional area under different installation conditions can be rapidly calculated without repeating full-wave simulation, and the method is suitable for antenna housing design and antenna installation optimization.

Inventors

• HU JUN
• Qin Xiaozhu
• SHI CHENBO
• PAN JIN
• LIU SIHAO
• CHEN YONGPIN
• YANG DEQIANG

Assignees

• 电子科技大学

Dates

Publication Date

20260508

Application Date

20251225

Claims (4)

1. 1. A radome antenna combination response rapid evaluation method based on a spherical domain generalized transmission line model comprises the following steps: (1) Constructing an interface mode space consisting of a spherical domain M type and an N type mode; (2) Performing one-time full-wave simulation on the radome and projecting the full-wave simulation to the mode space to obtain a spherical-domain generalized transmission line operator; (3) Performing one-time full-wave simulation on the antenna and constructing a spherical multi-port response matrix; (4) Constructing a spherical domain geometric transformation operator for describing translation and rotation of the antenna; (5) And cascading the antenna response, the geometric transformation and the radome transmission line operators to obtain the outer-domain radiation pattern coefficient of the combined system.
2. 2. The method of claim 1, wherein the spherical-domain generalized transmission line operator of the radome is represented as: ; Wherein, the Is a mode coefficient incident to the sphere interface from the outer side of the cover body; is the mode coefficient radiated outwards by the cover; is a mode coefficient incident to the inner sphere interface from the inside of the cover body; the mode coefficients radiating back from the inner interface of the housing to the inner region, the matrices a, B, C, D describe the outer self-response, the inner incident to outer coupling, the outer incident to inner coupling, and the inner self-response, respectively.
3. 3. The method of claim 1, wherein the sphere geometry transformation operator is: ; After full-wave simulation is carried out on the antenna once, the spherical mode coefficient of the radiation field of the antenna on the reference spherical surface is unfolded; For the sphere geometry transformation operator, For the translational position of the antenna relative to the core, Is an attitude angle (such as the euler angle), Is the mode coefficient in the new installation state.
4. 4. A method according to any one of claims 1 to 3, wherein only the geometric transformation operator is updated during the optimization process, the radome transmission line operator and the antenna response matrix remaining unchanged.

Description

Radome antenna combination response rapid evaluation method based on spherical-domain generalized transmission line model Technical Field The invention belongs to the technical field of electromagnetic field numerical analysis and antenna engineering, and relates to a method for rapidly evaluating combined response of an antenna housing and an antenna in the housing by utilizing a spherical-domain generalized transmission line model, which can be used for antenna housing design, mounting position and posture optimization of the antenna in the housing and array housing integrated performance analysis. Background Radomes are widely used in radar, communication, steering and detection systems, including protecting internal antennas, improving aerodynamic profile, and reducing scatter cross sectional area (RCS). The material, electromagnetic thickness, curved shape and multilayer structure of the radome can all significantly affect the radiation characteristics of the antenna within the radome. In engineering applications, the mounting position and attitude (including translational, rotational, and polarization directions) of the antenna within the enclosure have a critical impact on system performance. For example, in order to realize the integral stealth of the array cover, the integral scattering of the antenna cover needs to be reduced on the premise of ensuring the radiation performance of the antenna, and different installation modes can cause different incident angle spectrums, phase distributions and propagation paths, thereby changing the directional patterns, gains, beam offset and RCS. The traditional method adopts the integral simulation of the radome and the antenna, has huge calculation amount, needs repeated modeling and solving when exploring a plurality of installation positions and postures, and has extremely low efficiency. Therefore, a method is needed to enable the antenna housing and the antenna to be simulated only once respectively, so that the performance of the combined system at any position and any posture can be rapidly predicted. Disclosure of Invention The invention provides a radome antenna combination response rapid evaluation method based on a spherical-domain generalized transmission line model. The method comprises the following steps: 1. Equivalent the radome as a bidirectional spherical domain generalized transmission line; 2. Representing the antenna radiation behavior as a sphere multiport response matrix; 3. introducing an parsed spherical domain geometric transformation operator to describe the position and the posture change of the antenna; 4. realizing cascade solution of radome antennas in a sphere domain mode space; Thus, the rapid assessment of different installation states can be performed without repeating full-wave simulation. The technical scheme of the invention comprises the following steps: 1. building sphere schema base and interface space In the free space region outside and inside the radome, the electromagnetic field satisfies the homogeneous helmholtz equation. The invention selects two types of linear independent spherical domain vector modes as angular expansion bases: , Wherein the method comprises the steps of Is a mode index. The mode family forms a sphere interface space and can be used for uniformly describing the field distribution of the outer domain and the inner domain. 2. Spherical-domain generalized transmission line model of radome Setting: • the mode coefficient of the ball domain interface is incident from the outer side of the cover body; • the mode coefficient of the radiation outwards from the cover body; • Mode coefficients incident to the inner sphere interface from the inside of the cover body; • mode coefficients radiating back from the interface inside the enclosure to the interior region. The sphere generalized transmission line model defining the cover body is as follows: ,. The matrices a, B, C, D describe the outside self-response, the inside-to-outside coupling, the outside-to-inside coupling, and the inside self-response, respectively. The matrix can be obtained by one-time full-wave simulation and space projection in the sphere mode. 3. Spherical multiport response model of antenna Let the antenna port excitation vector be. After the antenna is subjected to full-wave simulation once, the radiation field of the antenna on the reference sphere is unfolded into a sphere mode coefficient: , Wherein the method comprises the steps ofIs a sphere multiport response matrix of the antenna. Because the reference sphere is consistent with the sphere interface on the inner side of the cover body,Can be directly used asIs input to the computer. 4. Spherical domain geometric transformation operator for antenna position and attitude The actual mounting position and attitude of the antenna is typically different from the reference coordinate system at the time of modeling. The invention introduces a sphere geometry transformation opera