A high-efficiency evaluation method for mutual coupling effect of transceiving phased array

Abstract

The application relates to the field of phased array antennas, and discloses a high-efficiency evaluation method for the mutual coupling effect of a receiving phased array and a transmitting phased array. The method comprises the following steps: 1) selecting a receiving array element and a transmitting array element in the receiving phased array and the transmitting phased array; 2) modeling and simulating in simulation software HFSS according to the positions and models of the array elements to obtain the transmission coefficient between the two array elements; 3) moving the transmitting array element to the position of another transmitting array element and simulating again; 4) repeating step 3) until the positions of all the array elements in the transmitting phased array are traversed; 5) synthesizing all the transmission coefficients to obtain the coupling coefficient of the transmitting phased array to the selected receiving array element; 6) placing the receiving array element at the position of another receiving array element and repeating steps 2) to 5); and 7) repeating step 6) until the positions of all the array elements in the receiving phased array are traversed, and finally obtaining the coupling coefficient of the transmitting phased array to all the array elements in the receiving phased array. The application realizes high-efficiency and fast evaluation of the mutual coupling effect of a large receiving phased array and a transmitting phased array.

Description

Technical Field

[0001] This invention relates to the field of phased array antennas, and more specifically to an efficient evaluation method for the mutual coupling effect of transmit and receive phased arrays. Background Technology

[0002] Active phased arrays, as a current hot topic in array antenna development, have received widespread attention and are widely used in radar, communication, and electronic warfare fields. For complex application systems, especially integrated reconnaissance, interception, detection, and communication platforms, which are equipped with both transmitting and receiving phased arrays, the coupling effect between the transmitting and receiving phased arrays needs to be evaluated during the design process. Based on the evaluation results, necessary isolation measures should be taken to prevent the receiving phased array from malfunctioning or even burning out the receiving channel during transmission.

[0003] Phased arrays are typically large in scale, making it difficult for simulation software to directly simulate the entire array. Therefore, in response to the aforementioned application requirements and practical problems, it is necessary to propose an efficient evaluation method for the mutual coupling effect of transmit and receive phased arrays, in order to meet the application requirements of speed, accuracy, and ease of implementation. Summary of the Invention

[0004] The purpose of this invention is to propose an efficient evaluation method for the mutual coupling effect of transmit and receive phased arrays, which can accurately and efficiently obtain the coupling coefficients of each element of the transmit phased array to the receive phased array, thereby guiding the isolation design of the transmit and receive phased arrays and realizing full-duplex operation of the transmit and receive phased arrays.

[0005] The technical solution adopted in this invention is as follows:

[0006] An efficient method for evaluating the mutual coupling effect of transmit and receive phased arrays includes the following steps:

[0007] Step 1: Randomly select a receiving element in the receiving phased array and randomly select a transmitting element in the transmitting phased array;

[0008] Step 2: Based on the coordinate positions and array model of the two array elements selected in Step 1, use the simulation software HFSS to perform modeling and simulation to obtain the transmission coefficient between the two array elements.

[0009] Step 3: Keep the position of the receiving array element unchanged, place the transmitting array element in the position of other transmitting array elements, and simulate the transmission coefficient of the transmitting array element and the receiving array element at the current position.

[0010] Step 4: Repeat step 3 until the transmitting element has traversed the positions of all elements in its transmitting phased array;

[0011] Step 5: Combine all the obtained transmission coefficients to obtain the coupling coefficient of the entire transmitting phased array to the receiving array element;

[0012] Step 6: Place the receiving array element in the position of the adjacent array element, and repeat steps 2 to 5 to obtain the coupling coefficient of the transmitting phased array to the receiving array element in the new position.

[0013] Step 7: Repeat step 6 until the receiving array element has traversed the positions of all array elements in the receiving phased array, and finally obtain the coupling coefficient of the transmitting phased array to all array elements in the receiving phased array.

[0014] Furthermore, in step 2, modeling and simulation are performed based on the coordinate relationship of the designed transceiver array.

[0015] Furthermore, in step 2, modeling and simulation are performed using the simulation software HFSS, with the model boundary conditions being FE-BI boundaries.

[0016] Furthermore, the transmission coefficient mentioned in step 2 is expressed as S. mn,ij , represents the transmission coefficient of the (i,j)th transmitting element in the transmitting phased array to the (m,n)th receiving element in the receiving phased array.

[0017] Furthermore, the transmission coefficient S mentioned in step 3 mn,ij Represented using real and imaginary parts, i.e., Re(S) mn,ij ) and Im(S mn,ij ).

[0018] Furthermore, the method for synthesizing the transmission coefficients described in step 5 is specifically expressed as follows:

[0019]

[0020] In the formula, P and Q represent the P×Q array elements of the transmitting phased array.

[0021] The advantages of this invention are: This method overcomes the difficulty of simulating large phased array antennas with existing simulation software. By solving the transmission coefficients between elements, which can be obtained quickly and conveniently, and by synthesizing the solved transmission coefficients using a specific method, the coupling coefficients of the entire transmitting phased array to each element of the receiving phased array can be obtained, thereby realizing the efficient and rapid evaluation of the mutual coupling effect of large transmitting and receiving phased arrays. Attached Figure Description

[0022] Figure 1 This is a flowchart of an embodiment of the present invention.

[0023] Figure 2 This is a schematic diagram of the 4×8 transmitting phased array and the 8×8 receiving phased array in the embodiment.

[0024] Figure 3 This is a comparison of the coupling coefficient of the transmitting phased array pair (1,1) receiving array element obtained by this method in the embodiment with the coupling coefficient obtained by direct full array simulation. Detailed Implementation

[0025] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0026] This invention proposes an efficient method for evaluating the mutual coupling effect of transmit and receive phased arrays, the specific steps of which are as follows:

[0027] Define the first element at the top left corner of the receiving phased array and the transmitting phased array as (1,1) of their respective arrays. The sequence number relationship of each element in the transmitting phased array and the receiving phased array is as follows:

[0028]

[0029] (1) Select the (1,1)th element in the receiving phased array and select the (1,1)th element in the transmitting phased array;

[0030] (2) Based on the coordinate positions and array model of the two array elements selected in step (1), modeling and simulation are performed in the simulation software HFSS to obtain the transmission coefficient S between the two array elements. 11,11 Transmission coefficient S 11,11 With the real part Re(S) 11,11 ) and the imaginary part Im(S 11,11 The model is represented as FE-BI boundary conditions.

[0031] (3) Keeping the receiving element (1,1) unchanged, place the transmitting element at position (1,2) and simulate the transmission coefficient S between the transmitting element at position (1,2) and the receiving element at position (1,1). 11,12 ;

[0032] (4) Repeat step (3) until the transmitting element has traversed the positions of all elements in its transmitting phased array. It should be noted that there are only two transmitting and receiving elements in the entire simulation. The simulation only shows the elements traversing the positions of other elements according to the designed full array coordinates. The other elements in the phased array do not exist in the simulation model.

[0033] (5) Combine all the transmission coefficients obtained in the above steps to obtain the coupling coefficient of the entire transmitting phased array to the (1,1)th receiving element:

[0034]

[0035] (6) Place the receiving array element in the position of other receiving array elements, and repeat steps (2) to (5) to obtain the coupling coefficient of the transmitting phased array to the receiving array element in the new position.

[0036] (7) Repeat step (6) until the receiving array element has traversed the positions of all elements in the receiving phased array, and finally obtain the coupling coefficients of the transmitting phased array to all elements in the receiving phased array, which can be represented in matrix form:

[0037]

[0038] Example 1

[0039] To facilitate verification of the accuracy of this method, a relatively small-scale transceiver phased array was selected. Simulation verification can be found in [link to simulation]. Figure 2 . Figure 2 The diagram shows a 4×8 transmit phased array and an 8×8 receive phased array. The transmit phased array uses horn antennas as basic units with a unit spacing of 10mm, and the receive phased array uses microstrip antennas as basic units with a unit spacing of 10mm.

[0040] The following calculation uses the method of this invention to determine the coupling coefficient between the transmitting phased array operating in the 27GHz–31GHz frequency band and the receiving phased array element operating in the 17.7GHz–21.2GHz frequency band. The coupling coefficient of the entire transmitting phased array to the (1,1)th receiving element is obtained by synthesizing the transmission coefficients of each element in the transmitting phased array and the receiving phased array element. This coefficient is then compared with the coupling coefficient obtained from direct full-array simulation. Figure 3 As shown, the difference between the comprehensive value and the simulated value is about 2dB. Considering the simulation error and actual engineering use, this difference is completely acceptable.

[0041] The above description is merely one embodiment of the present invention. It should be noted that any modifications or variations made without departing from the principles and concept of the present invention should fall within the protection scope of the present invention.

Claims

1. A method for efficiently evaluating the mutual coupling effect of transmit and receive phased arrays, characterized in that, Includes the following steps: Step 1: Randomly select a receiving element in the receiving phased array and randomly select a transmitting element in the transmitting phased array; Step 2: Based on the coordinate positions and array model of the two array elements selected in Step 1, use the simulation software HFSS to perform modeling and simulation to obtain the transmission coefficient between the two array elements. Step 3: Keep the position of the receiving array element unchanged, place the transmitting array element in the position of other transmitting array elements, and simulate the transmission coefficient of the transmitting array element and the receiving array element at the current position. Step 4: Repeat step 3 until the transmitting element has traversed the positions of all elements in its transmitting phased array; Step 5: Combine all the obtained transmission coefficients to obtain the coupling coefficient of the entire transmitting phased array to the receiving array element; Step 6: Place the receiving array element in the position of the adjacent array element, and repeat steps 2 to 5 to obtain the coupling coefficient of the transmitting phased array to the receiving array element in the new position. Step 7: Repeat step 6 until the receiving array element has traversed the positions of all array elements in the receiving phased array, and finally obtain the coupling coefficient of the transmitting phased array to all array elements in the receiving phased array.

2. The efficient evaluation method for the mutual coupling effect of transmit and receive phased arrays as described in claim 1, characterized in that, In step 2, modeling and simulation are performed based on the coordinate relationship of the designed transceiver array.

3. The efficient evaluation method for the mutual coupling effect of transmit and receive phased arrays as described in claim 1, characterized in that, In step 2, the model is modeled and simulated using the simulation software HFSS, with the model boundary condition being FE-BI boundary.

4. The efficient evaluation method for the mutual coupling effect of transmit and receive phased arrays as described in claim 1, characterized in that, The transmission coefficient mentioned in step 2 is denoted as S. mn,ij , represents the transmission coefficient of the (i,j)th transmitting element in the transmitting phased array to the (m,n)th receiving element in the receiving phased array.

5. The efficient evaluation method for the mutual coupling effect of transmit and receive phased arrays as described in claim 4, characterized in that, The transmission coefficient S mentioned in step 3 mn,ij Represented using real and imaginary parts, i.e., Re(S) mn,ij ) and Im(S mn,ij ).

6. The efficient evaluation method for the mutual coupling effect of transmit and receive phased arrays as described in claim 5, characterized in that, The method for synthesizing the transmission coefficients described in step 5 is specifically expressed as follows: In the formula, P and Q represent the P×Q array elements of the transmitting phased array.

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