CN112134031B

CN112134031B - Transmit-receive antenna array apparatus and method of designing the same

Info

Publication number: CN112134031B
Application number: CN202010988014.4A
Authority: CN
Inventors: 张建新; 姜祥奔; 张殿坤; 黄平平; 李世龙
Original assignee: Obe Terahertz Technology Beijing Co ltd
Current assignee: Obe Terahertz Technology Beijing Co ltd
Priority date: 2020-08-18
Filing date: 2020-09-18
Publication date: 2021-09-21
Anticipated expiration: 2040-09-18
Also published as: CN212965469U; CN112162328A; CN112162327A; CN212872946U; CN112132002A; CN112162326A; CN112131525B; CN112162327B; CN112162328B; CN213692346U; CN112131525A; CN112132002B; CN112162326B; CN112134031A

Abstract

The present invention provides a transmitting-receiving antenna array apparatus, comprising: a substrate, wherein a surface of the substrate is parallel to a two-dimensional plane consisting of a first directional dimension and a second directional dimension that are perpendicular to each other; a transmit antenna array in which a plurality of transmit antenna elements are arranged on the substrate along the first directional dimension; a receive antenna array in which a plurality of receive antenna elements are arranged on the substrate along the first direction dimension; and a partition wall formed with choke grooves, the partition wall being arranged on the substrate along the first direction dimension in a length direction thereof and along the second direction dimension in a width direction thereof, and the partition wall being perpendicular to a surface of the substrate in a height direction thereof, wherein the choke grooves are formed on a side of the partition wall perpendicular to the surface of the substrate and extend in the length direction and the width direction of the partition wall.

Description

Transmit-receive antenna array apparatus and method of designing the same

Technical Field

Aspects of the present invention relate to a transmit-receive antenna array apparatus in the field of imaging detection and a method of designing the same.

Background

Imaging detection techniques are widely used today in a wide variety of application scenarios. One application scenario is that in areas with high public safety requirements, such as airports, stations, frontiers and the like, safety inspection devices are adopted to perform safety inspection on mobile personnel and articles carried by the mobile personnel. The carried articles generally include articles made of metal and articles made of nonmetal. However, the conventional security inspection apparatus has a good detection effect only on objects made of metal (e.g., metal contraband), and the detection effect on objects made of non-metal (e.g., non-metal contraband) is not ideal. To compensate for this situation, active millimeter wave human body security devices based on synthetic aperture imaging technology have been developed. The active millimeter wave human body security inspection device can effectively detect target objects (including metal objects and non-metal objects) hidden in various parts of the human body under clothing coverage without directly contacting the human body of the person to be inspected by using the active millimeter wave imaging technology, and can extract information such as the shape, size, and position of the hidden target objects from an image generated based on the detection. The active millimeter wave human body security inspection device generally comprises a transmitting-receiving antenna array, which further comprises a transmitting antenna array and a receiving antenna array, wherein the transmitting antenna array can transmit millimeter wave signals to a free space (including air and vacuum) according to specific gain requirements and beam width requirements, and the receiving antenna array can receive echo signals of the transmitted millimeter wave signals reflected by a target object from the free space. The active millimeter wave human body security device typically further includes a processor (e.g., CPU, GPU, etc.), wherein the processor is capable of signal processing the received echo signals to generate an image for the target item and extract information of the target item therefrom.

An active millimeter wave human body security device is generally regarded as a specific application of a continuous wave radar system. In such a system, the transmitting antenna array and the receiving antenna array are always in simultaneous operation, and accordingly, the receiving antenna array will inevitably receive electromagnetic interference signals directly transmitted from the transmitting antenna array (through free space) or indirectly coupled (for example, along a metal surface on which the transmitting and receiving antenna array is disposed), in addition to the echo signal reflected by the target object. Disadvantageously, such electromagnetic interference signals will raise the noise floor of the receiving antenna array and deteriorate the signal-to-noise ratio, thereby affecting the performance of the receiving and transmitting antenna array and further affecting the detection effect of the active millimeter wave human body security inspection device on smaller target objects.

In order to reduce such adverse effects of the electromagnetic interference signals, it is necessary to increase an isolation requirement value (also referred to as an isolation index, and for example, equal to a ratio between signal transmission power of a transmitting antenna unit in the transmitting antenna array and signal reception power of a receiving antenna unit in the receiving antenna array, usually in dB) of the transmitting-receiving antenna array, which is a key index for designing the transmitting-receiving antenna array and thus determines performance of the transmitting-receiving antenna array. Currently, conventional measures for improving isolation requirement values of transmit-receive antenna arrays include: the distance between the transmitting antenna array and the receiving antenna array is unconditionally increased, namely, the distance between the transmitting antenna array and the receiving antenna array is unconditionally increased, so that the transmission attenuation of the electromagnetic interference signals in a free space is realized, the influence of the electromagnetic interference signals on the receiving antenna array is reduced, and the isolation requirement value of the transmitting antenna array is improved; or a metal baffle or a wave-absorbing material is additionally arranged between the transmitting antenna array and the receiving antenna array, namely, a metal baffle or a wave-absorbing material wall with a certain height is arranged in a free space between the transmitting antenna array and the receiving antenna array and is used for reflecting or absorbing electromagnetic wave interference signals transmitted to the receiving antenna array by the transmitting antenna array, so that the isolation requirement value of the transmitting-receiving antenna array is improved.

The measure of unconditionally increasing the distance between the transmitting and receiving antenna arrays can simply and effectively improve the isolation requirement value of the transmitting and receiving antenna arrays, however, the measure is not applicable to the continuous wave radar system which needs a compact structure. In addition, for a quasi-single-station continuous wave radar system such as an active millimeter wave human body security device, increasing the pitch of the transmit-receive antenna array (e.g., improperly) may seriously deteriorate the imaging quality of its image, thereby deteriorating its detection effect.

For the measures of adding metal baffles, there is a challenge in how to select the optimal height of the metal baffles. For example, for an active millimeter wave human body security device: if the selected height is higher, the metal baffle plate not only has larger influence on an antenna directional diagram of the receiving and transmitting antenna array, but also increases the overall height of the receiving and transmitting antenna array, so that the detection space of a person to be detected in the equipment is further compressed, and the user experience is reduced; and if the selected height is lower, the required value of the isolation degree of the metal baffle plate is not obviously improved. For the measure of installing the wave-absorbing material wall additionally, the wave-absorbing material wall applicable to the broadband/high-frequency band (corresponding to the millimeter wave) of the active millimeter wave human body security inspection device has higher cost, and the height of the wave-absorbing material wall similarly influences the improvement of the required value of the isolation degree.

Disclosure of Invention

The present invention is directed to solving the aforementioned drawbacks in terms of improving isolation requirement values of transmit-receive antenna arrays in continuous wave radar systems (e.g., imaging devices such as active millimeter wave human body security devices), including: the method has the advantages that the inapplicability and the detection effect are deteriorated due to unconditional increase of the distance between the receiving and transmitting antenna arrays, the user experience is reduced due to the addition of a metal baffle or a wave-absorbing material wall, the isolation requirement value is not obviously improved, and the cost is high.

In order to solve the above-mentioned drawbacks, the present invention provides an improved transmit-receive antenna array apparatus in an imaging device (e.g., an active millimeter wave human body security inspection device) and a design scheme thereof, which can support effectively increasing a required isolation value of the transmit-receive antenna array in a wide frequency band range, thereby improving the imaging quality and the detection effect of the imaging device and further satisfying the requirement of the imaging system on size compactness.

According to an embodiment of the present invention, there is provided a method for designing the transceiving antenna array apparatus in an imaging device, including: determining parameters of the transmit antenna array and the receive antenna array according to a spatial resolution and an operating frequency of the imaging device on a two-dimensional plane composed of a first directional dimension and a second directional dimension that are perpendicular to each other; determining a parameter of the choke groove according to a system requirement of the imaging device.

According to an embodiment of the present invention, there is provided an apparatus for designing a transmit-receive antenna array device, including: a memory storing a computer program; a processor coupled to the memory and configured to cause the processor to perform the method when the computer program is executed.

According to an embodiment of the present invention, there is provided an image forming apparatus including: the transmit-receive antenna array apparatus; one or more processing units for controlling the transmit antenna array apparatus to transmit a beam and forming an image based on the beam received by the transmit antenna array apparatus.

According to an embodiment of the present invention, there is provided a method for manufacturing the transceiving antenna array apparatus, including: mounting the transmit antenna array on the substrate; mounting the receive antenna array on the substrate; the partition wall formed with the choke groove is mounted on the substrate.

Drawings

Embodiments are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings in which like reference numerals refer to similar elements.

Fig. 1 shows a schematic diagram of a transmit receive antenna array apparatus according to an embodiment of the invention.

Fig. 2 shows various views of a transmit-receive antenna array apparatus according to an embodiment of the invention.

Fig. 3 shows a schematic view of a multistage choke groove according to an embodiment of the invention.

Fig. 4 shows a schematic view of a 3-stage choke groove according to an embodiment of the invention.

Fig. 5 shows a flow chart of a method for designing a transmit receive antenna array apparatus according to an embodiment of the invention.

Fig. 6 shows an apparatus for implementing a method for designing a transmit receive antenna array apparatus according to an embodiment of the invention.

Fig. 7 shows a graph comparing isolation requirement values of a conventional transmit-receive antenna array apparatus compared to isolation requirement values of an improved transmit-receive antenna array apparatus according to an embodiment of the invention.

Fig. 8 shows a graph reflecting standing wave characteristics of transmit antenna elements in a transceiving antenna array according to an embodiment of the present invention.

Fig. 9, 10 and 11 respectively show azimuth and elevation directional patterns of the transmitting antenna unit in the transceiving antenna array apparatus 100 according to the embodiment of the present invention at a plurality of frequencies within a high frequency operating range.

Various aspects and features of various embodiments of the present invention are described with reference to the above-identified figures. The drawings described above are only schematic and are non-limiting. The arrangement, reference numerals, or appearance of the respective elements/components/modules/blocks in the above-described drawings may be changed without departing from the gist of the present invention, and are not limited by what is shown in the drawings.

Detailed Description

In the following description, numerous specific details are set forth. However, embodiments as described herein may be practiced without certain specific details. In particular embodiments, well-known structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

Fig. 1 shows a schematic diagram of a transmit receive antenna array apparatus according to an embodiment of the invention. As shown, the transmitting and receiving antenna array apparatus 100 includes: a substrate 101, a transmitting antenna array 102, a receiving antenna array 103, and a partition wall 105 formed with a choke groove 104. According to the embodiment of the present invention, the transmitting antenna array 102 and the receiving antenna array 103 may be collectively referred to as the transceiving antenna array 102 and 103.

In accordance with an embodiment of the present invention, the transmit receive antenna array apparatus 100 may be a component of an imaging device (e.g., an active millimeter wave human body security device). For ease of description, the transmit receive antenna array apparatus 100 is shown generally parallel to or in a two-dimensional plane made up of two directional dimensions that are perpendicular to each other (e.g., a pitch dimension as a first directional dimension and an azimuth dimension as a second directional dimension).

According to an embodiment of the present invention, as shown, the substrate 101 may be a metal floor, which may be arranged parallel to or coinciding with a two-dimensional plane, in other words, the surface of the substrate 101 may be parallel to or coinciding with a two-dimensional plane. According to another embodiment of the present invention, the substrate 101 may be an alloy floor, a non-metal floor, or the like.

According to an embodiment of the present invention, as shown, the transmit antenna array 102 may include a plurality of transmit antenna elements 102-1-102-i (where i is an integer greater than 1, e.g., i is equal to 8), and the plurality of transmit antenna elements 102-1-102-i may be arranged on the substrate 101 along the first direction dimension. According to an embodiment of the present invention, the receiving antenna array 103 may include a plurality of receiving antenna units 103-1 to 103-i (where i is an integer greater than 1, e.g., i is equal to 8), and the plurality of receiving antenna units 103-1 to 103-i may also be arranged on the substrate 101 along the first direction dimension. According to an embodiment of the present invention, the transmitting antenna elements 102-1 ~ 102-i and/or the receiving antenna elements 103-1 ~ 103-i may be planar antennas such as horn antennas, for example, pyramid horn antennas, conical horn antennas, and the like.

According to an embodiment of the present invention, as shown, the partition walls 105 may be arranged on the substrate 101 along a first direction dimension in a length direction thereof and along a second direction dimension in a width direction thereof, and the partition walls 105 may be perpendicular to a surface of the substrate 101 in a height direction thereof. According to an embodiment of the present invention, further as shown, two (or a single, not shown) partition walls 105 are arranged on both sides (or a single side, not shown) of the transmit antenna array 102 in the second direction dimension, and two (or a single, not shown) partition walls 105 are arranged on both sides (or a single side, not shown) of the receive antenna array 103 in the second direction dimension. According to another embodiment of the present invention, the partition wall 105 may be a wall of a metal material having a certain height, for example, a metal baffle.

According to an embodiment of the present invention, as will be described in further detail below, the choke groove 104 may be formed on a side of the partition wall 105 perpendicular to the surface of the substrate 101, and may extend in the length direction and the width direction of the partition wall 105. The choke groove 104 may have an opening 106 recessed from a side surface of the partition wall 105, wherein the opening 106 may extend in a width direction of the partition wall 105, and the opening 106 may have a shape (e.g., a rectangular shape) in a cross section of the choke groove 104 perpendicular to a length direction of the partition wall 105.

Fig. 2 shows various views of a transmit receive antenna array apparatus 100 according to an embodiment of the present invention. Fig. 2 may be an exhaustive view corresponding to the transmit receive antenna array apparatus 100 shown in fig. 1, in accordance with an embodiment of the present invention. According to an embodiment of the invention, fig. 2 may comprise: fig. 2- (a), which depicts a front view from above of the transmit receive antenna array apparatus 100 shown in fig. 1; fig. 2- (b), which depicts a cross-sectional view from the transmit receive antenna array apparatus 100 shown in fig. 1 as viewed along a first directional dimension (e.g., a pitch dimension); and fig. 2- (c), which depicts a back view from below of the transmit receive antenna array apparatus 100 shown in fig. 1.

According to an embodiment of the present invention, as shown in fig. 2- (a), the transmitting-receiving antenna array apparatus 100 may include a substrate 101, a transmitting antenna array 102, a receiving antenna array 103, and a partition wall 105 formed with a choke groove 104. According to embodiments of the present invention, depending on the particular application scenario, the substrate 101 may have a particular size in a first direction dimension (e.g., pitch dimension) and a second direction dimension (e.g., azimuth dimension), respectively, e.g., as shown, the size in the first direction dimension is equal to about 68.6mm and the size in the second direction dimension is equal to about 90 mm. According to further embodiments of the present invention, as shown, mounting holes for mounting the transceiving antenna array apparatus 100 may be uniformly arranged on the substrate 101. Those skilled in the art will appreciate that although example dimensions and top-down profiles of the substrate are shown in fig. 2- (a), the technical solution of the present application is not limited to specific dimensions and top-down profiles.

According to an embodiment of the present invention, as shown in fig. 2- (b), the transmitting-receiving antenna array apparatus 100 may include a substrate 101, a transmitting antenna array 102, a receiving antenna array 103, and a partition wall 105 formed with a choke groove 104. According to an embodiment of the present invention, the partition wall 105 may have a number of choke slots 104, wherein the number of choke slots 104 may be generally referred to as a choke slot number. As shown, each partition wall 105 may have three choke grooves 104, and thus may be referred to as having three-stage choke grooves. As further shown, a pair of isolation walls 105 may be disposed on both sides of the transmit antenna array 102, and all the openings 106 of the corresponding tertiary choke grooves thereof may all face the transmit antenna array 102, and a pair of isolation walls 105 may also be disposed on both sides of the receive antenna array 103, and all the openings 106 of the corresponding tertiary choke grooves thereof may all face the receive antenna array 103. According to further embodiments of the present invention, depending on the specific application scenario, a pair of isolation walls 105 may be arranged on both sides of the transmit antenna array 102, all openings 106 of their corresponding tertiary choke slots may face away from the transmit antenna array 102, and a pair of isolation walls 105 may also be arranged on both sides of the receive antenna array 103, all openings 106 of their corresponding tertiary choke slots may face away from the receive antenna array 103. According to further embodiments of the present invention, depending on the specific application scenario, a pair of isolation walls 105 may be arranged on both sides of the transmit antenna array 102, all openings 106 of their corresponding tertiary choke slots may be partially facing the transmit antenna array 102, and a pair of isolation walls 105 may also be arranged on both sides of the receive antenna array 103, all openings 106 of their corresponding tertiary choke slots may be partially facing the receive antenna array 103. According to further embodiments of the present invention, depending on a specific application scenario, one isolation wall 105 may be arranged on one side of the transmit antenna array 102, and all openings 106 of corresponding tertiary choke grooves may be all facing or partially facing the transmit antenna array 102, and one isolation wall 105 may be arranged on one side of the receive antenna array 103, and all openings 106 of corresponding tertiary choke grooves may be all facing or partially facing the receive antenna array 103. It may be understood by those skilled in the art that although example dimensions of the substrate thickness and the partition wall height are shown in fig. 2- (b), the technical solution of the present application is not limited to a specific dimension.

According to an embodiment of the present invention, as shown in fig. 2- (c), the transmitting-receiving antenna array apparatus 100 may include a substrate 101, a transmitting antenna array 102, a receiving antenna array 103, and a not-shown partition wall 105 formed with a choke groove 104. As shown, each transmit or receive antenna element in the transmit or receive antenna array 102 or 103 has a particular shape and size of waveguide ports 202-1-202-i or 203-1-203-i (where i is an integer greater than 1, e.g., i equals 8), e.g., the waveguide ports may have a rectangular shape, and the waveguide ports may have dimensions of 2.845mm in a first direction dimension and 5.69mm in a second direction dimension. According to further embodiments of the present invention, the waveguide ports of each transmit antenna element or receive antenna element have the same or different specific shapes and/or sizes. According to the embodiment of the invention, for example, each transmitting antenna unit or each receiving antenna unit is a pyramid horn antenna which is composed of a BJ400 rectangular waveguide port and a horn structure with the cross section thereof linearly widening outwards. Those skilled in the art will appreciate that although example dimensions of the waveguide port are shown in fig. 2- (c), the technical solution of the present application is not limited to a specific dimension.

Fig. 3 illustrates various views of a multistage choke groove according to an embodiment of the present invention. Fig. 3 may be a detailed view corresponding to choke groove 104 shown in fig. 2- (b), according to an embodiment of the present invention. Fig. 3 may depict a side view formed after the choke groove 104 is rotated counterclockwise by 90 ° as viewed in a cross section perpendicular to the length direction of the partition wall 105 from the choke groove 104 shown in fig. 2- (b), according to an embodiment of the present invention.

According to an embodiment of the present invention, as shown, the partition wall 105 may have a number of choke grooves 104, wherein the number of choke grooves 104 may be generally referred to as a number j of choke groove stages (where j is a positive integer equal to or greater than 1), and accordingly, the number of choke grooves 104 may be referred to as a 1 st-stage choke groove, a 2 nd-stage choke groove … … j-th-stage choke groove, respectively.

According to an embodiment of the present invention, each stage of choke slots 104 has an opening 106 as shown, the opening 106 having a slot width d_JAnd groove depth h_J(where J is 1,2 … J, where J represents the number of choke groove stages). According to an embodiment of the invention, as shown in FIG. 3 and with reference to FIG. 1, the groove depth h_JIs a dimension of each stage choke groove 104 in the width direction of the partition wall 105 in the aforementioned cross section, a groove width d_JIs a dimension of each stage choke groove 104 in the height direction of the partition wall 105 in the aforementioned cross section. According to the embodiment of the present invention, the groove width d of one choke groove J_JAnd groove depth h_JMay be equal to a quarter wavelength of the operating frequency corresponding to the choke groove J. According to another embodiment of the invention, in practical design, the width d of the choke groove J is such that_JAnd groove depth h_JIt may be approximately equal to a quarter wavelength of an operating frequency corresponding to the choke groove J in order to achieve better performance, such as reducing large fluctuations in the transmission distribution characteristics of the transmitting antenna unit due to the surrounding receiving antenna unit, choke groove, and metal floor.

According to the embodiment of the present invention, as shown in the figure, teeth may be formed between the adjacent two stages of choke grooves 104 and at both ends of the partition wall 105 in the height direction thereofIn other words, two teeth may be formed on both sides of each stage of the choke groove 104. According to an embodiment of the present invention, as shown in fig. 3 and referring to fig. 1, the dimension of the teeth in the height direction of the partition wall 105 is the thickness b of the teeth_k(where k is 1,2 … j +1, where j represents the number of choke groove stages), where the thickness b of the teeth_kMay generally depend on the height of the partition wall 105, the number of corresponding choke slots 104 (i.e., the number j of choke slot stages), and the slot width d of each stage of choke slot 104_JWherein the height of the partition wall 105 may generally be less than a desired threshold. The desired threshold value depends on the size requirements of the imaging device, and in order to increase the size of the internal space of the imaging device, for example a security check, given the overall size of the imaging device, it is necessary to reduce the height of the partition wall as much as possible.

Fig. 4 shows a schematic view of a 3-stage choke groove according to an embodiment of the present invention. Fig. 4 may be another detailed view corresponding to choke groove 104 shown in fig. 2- (b), according to an embodiment of the present invention. According to an embodiment of the invention, fig. 4 may include: fig. 4- (a) which depicts an oblique view of the three-dimensional topography of the choke groove 104 as viewed from the side of the opening 106 of the choke groove 104 shown in fig. 2- (b), the oblique view also showing to some extent a cross section of the choke groove 104 in a direction perpendicular to the length direction of the partition wall 105; and fig. 4- (b) which, similarly to fig. 3, depicts another side view formed after the choke groove 104 is rotated counterclockwise by 90 ° as viewed in a cross section perpendicular to the length direction of the partition wall 105 of the choke groove 104 shown in fig. 2- (b).

According to the embodiment of the present invention, as shown in fig. 4- (a), the number of the corresponding choke grooves 104 of the partition wall 105 (i.e., the number j of choke groove stages) is 3. According to an embodiment of the present invention, as shown in fig. 4- (a), 2 teeth are formed at both sides of each stage of the choke grooves 104, so that the 3 stages of the choke grooves 104 are formed with 4 teeth in a common shape, wherein each tooth may have a different or same thickness b_k(wherein k is 1-4). For example, as shown in FIG. 4- (a), thickness b₁＝0.7mm，b₂＝b₃＝b ₄1 mm. It may be understood by those skilled in the art that although an example size of the tooth thickness is illustrated in fig. 4- (a), the technical solution of the present application is not limited to a specific oneThe size of (c).

According to an embodiment of the present invention, as shown in fig. 4- (b), each stage of choke grooves 104 has an opening 106, and the opening 106 has a groove width d_JAnd groove depth h_J(where J is 1,2 … J, where J represents the number of choke groove stages and is equal to 3). According to an embodiment of the invention, as shown in FIG. 4- (b) and with reference to FIG. 1, the groove depth h_JIs a dimension of each stage choke groove 104 in the width direction of the partition wall 105 in the aforementioned cross section, a groove width d_JIs a dimension of each stage choke groove 104 in the height direction of the partition wall 105 in the aforementioned cross section. According to an embodiment of the invention, the slot width d_JAnd groove depth h_JMay be equal to a quarter wavelength of the corresponding operating frequency. According to an embodiment of the present invention, as shown in FIG. 4- (b), the groove width d_JAnd groove depth h_JMay be approximately equal to a quarter wavelength of the corresponding operating frequency. For example, as shown in FIG. 4- (b), the groove thickness d₁＝2.5mm，d₂＝2.3mm，d₃1.5mm and a groove thickness h₁＝2.35mm，h₂＝2.45mm，h₃＝2.55mm。

Fig. 5 shows a flow diagram of a method 500 for designing a transceiving antenna array apparatus according to an embodiment of the present invention. According to an embodiment of the present invention, the transmit-receive antenna array apparatus may be the transmit-receive antenna array apparatus 100 as shown in fig. 1-2, which may be a component of an imaging device (e.g., an active millimeter wave human body security device).

At step 502, parameters of the transmit antenna array and the receive antenna array may be determined according to the spatial resolution and operating frequency of the imaging device on a two-dimensional plane. For example, according to an embodiment of the present invention, with combined reference to fig. 1, parameters of the transmit antenna array 102 and the receive antenna array 103 may be determined according to the spatial resolution and the operating frequency of the imaging apparatus (or the transmit-receive antenna array apparatus 100) on a two-dimensional plane.

According to an embodiment of the present invention, referring to fig. 1 in combination, the two-dimensional plane may be a plane parallel to or coinciding with a surface of the substrate 101 in the transceiver antenna array device 100, and which comprises mutually perpendicular first direction dimensions (e.g.,pitch dimension) and a second direction dimension (e.g., azimuth dimension). According to an embodiment of the invention, the spatial resolution of the imaging device in the two-dimensional plane comprises the spatial resolution of the imaging device in the first direction dimension (e.g. denoted as ρ |)_Pit) And the spatial resolution of the imaging device in the second directional dimension (e.g., denoted as ρ_Azi) Each preconfigured according to the system requirements of the imaging device. According to an embodiment of the present invention, an imaging device may have a large operating frequency range, and thus may be referred to as a broadband imaging device. The operating frequency range of an imaging device can be generally denoted as f_L～f_H(e.g., 1 GH. ltoreq. f_L<f_H1THz) or less, wherein the center working frequency f in the working frequency range_c＝(f_L+f_H) A/2, wherein the central operating frequency corresponds to an operating wavelength λ_c＝C/f_cWhere C is a constant representing the propagation velocity of the electromagnetic wave in free space.

According to an embodiment of the present invention, with reference to fig. 1, determining parameters of the transmit antenna array 102 and the receive antenna array 103 may include: determining a beam width of a transmit antenna element in the transmit antenna array 102 on a two-dimensional plane, determining an effective size of the transmit antenna element on the two-dimensional plane, and determining a spacing relative to the transmit antenna array 102 and the receive antenna array 103, and determining a number of transmit antenna elements of the transmit antenna array 102 and/or a number of receive antenna elements of the receive antenna array 103.

According to an embodiment of the present invention, with reference to fig. 1 in combination, determining the beam widths of the transmit antenna elements in the transmit antenna array 102 on the two-dimensional plane may include: the beam width of the transmitting antenna element in the first direction dimension is determined and the beam width of the transmitting antenna element in the second direction dimension is determined, e.g. the beam width may be a 3dB beam width.

According to an embodiment of the invention, the beam width (e.g. denoted θ) of the transmit antenna unit in a first direction dimension (e.g. a pitch dimension)_Pit) Can be determined according to the following equation:

wherein λ is_cMay be the central operating frequency f of the operating frequency range of the imaging device_cCorresponding operating wavelength, p_PitIs the spatial resolution of the imaging device in a first directional dimension (e.g., the pitch dimension).

According to an embodiment of the invention, the beamwidth (e.g. denoted θ) of the transmit antenna element in a second directional dimension (e.g. the azimuth dimension)_Azi) Can be determined according to the following equation:

wherein λ is_cMay be the central operating frequency f of the operating frequency range of the imaging device_cCorresponding operating wavelength, p_AziIs the spatial resolution of the imaging device in a second directional dimension (e.g., the azimuthal dimension).

According to an embodiment of the present invention, with reference to fig. 1 in combination, determining the effective size of the transmit antenna element in the two-dimensional plane may comprise: an effective size of the transmit antenna element in a first directional dimension is determined, and an effective size of the transmit antenna element in a second directional dimension is determined.

According to an embodiment of the present invention, with combined reference to fig. 1, the effective size (e.g., denoted as D) of the transmit antenna element in a first directional dimension (e.g., a pitch dimension)_Pit) Can be determined according to the following equation:

wherein k is_PitThe constant value of lambda between 50 and 60 can be taken_cMay be a center operating frequency f in an operating frequency range of the imaging device_cCorresponding working waveLength, theta_PitIs the beamwidth of the transmit antenna element in a first directional dimension (e.g., a pitch dimension).

In accordance with an embodiment of the present invention, with combined reference to FIG. 1, the effective size (e.g., denoted as D) of the transmit antenna element in a second directional dimension (e.g., the azimuth dimension)_Azi) Can be determined according to the following equation:

wherein k is_AziThe constant value of lambda between 50 and 60 can be taken_cMay be a center operating frequency f in an operating frequency range of the imaging device_cCorresponding operating wavelength, θ_AziIs the beamwidth of the transmit antenna element in a second directional dimension (e.g., the azimuth dimension).

For example, according to an embodiment of the present invention, with reference to fig. 2- (c), in the case where the transmitting antenna unit employs a pyramidal horn antenna, D_AziCan be 10.2mm, D_PitMay take 7 mm.

In accordance with an embodiment of the present invention, with combined reference to fig. 1, determining the spacing associated with the transmit antenna array 102 and the receive antenna array 103 may comprise: determining a spacing between adjacent transmit antenna elements in the transmit antenna array 102 in a first directional dimension; and determining the spacing in the second directional dimension between the transmit antenna array 102 and the receive antenna array 103.

In accordance with an embodiment of the present invention, with combined reference to fig. 1, the spacing (e.g., denoted as Dis) between adjacent transmit antenna elements in a first directional dimension (e.g., a pitch dimension) in the transmit antenna array 102_Pit) Can be determined according to the following equation:

Dis_Pit＝2*ρ_Pit (5)

where ρ is_PitIs the spatial resolution of the imaging device in a first directional dimension (e.g., the pitch dimension).

According to an embodiment of the present invention, referring to fig. 1 in combination, determining the spacing between the transmit antenna array 102 and the receive antenna array 103 in the second directional dimension may further comprise: determining a spatial attenuation value of the electromagnetic wave transmitted by the transmission antenna array 102 based on the isolation requirement value of the imaging device, a gain value in the second direction dimension of the transmission antenna element obtained from the effective size of the transmission antenna element on the two-dimensional plane, and a target increase value of the relative isolation requirement value expected to be brought by the choke groove 104; and determining a spacing in the second directional dimension between the transmit antenna array 102 and the receive antenna array 103 from the spatial attenuation values.

According to an embodiment of the present invention, referring to fig. 1 in combination, the isolation requirement value of the imaging apparatus (or the transceiver antenna array apparatus 100 included therein) may also be generally referred to as an isolation indicator (e.g., denoted as Iso) and may be equal to a ratio, generally in dB, between the signal transmission power of the transmit antenna elements in the transmit antenna array 102 and the signal reception power of the receive antenna elements in the receive antenna array 103.

According to an embodiment of the present invention, referring in combination to fig. 1, a gain value (e.g. denoted Ga) of a transmitting antenna element in a second direction dimension (e.g. azimuth dimension) may be determined by calculating a radiation pattern of the transmitting antenna element in the second direction dimension using the effective sizes of the transmitting antenna element in the first direction dimension (e.g. elevation dimension) and the second direction dimension (e.g. azimuth dimension), respectively, and extracting a gain value of the radiation pattern at 90 ° (e.g. a gain value on a connection between a phase center of the transmitting antenna element and a phase center of the corresponding receiving antenna element). For example, the radiation pattern of the transmitting antenna element in the second direction dimension may be an output value calculated by using electromagnetic simulation software with the effective size of the transmitting antenna element in the first and second direction dimensions, respectively, as an input.

According to an embodiment of the invention, with reference to fig. 1 in combination, the boost value of the relative isolation requirement value by choke slot 104 may be determined based on one or more a priori values, for example, the boost value may be 10 dB.

According to an embodiment of the present invention, with reference to fig. 1 in combination, a spatial attenuation value (e.g., denoted as Loss) of an electromagnetic wave transmitted by the transmit antenna array 102 may be determined according to the following equation:

Loss＝-(Iso+10-2*Ga) (6)

where Iso is an isolation requirement/isolation index of the imaging apparatus (or the transceiver antenna array apparatus 100 included therein), Ga is a gain value of the transmitting antenna unit in the second direction dimension (for example, the azimuth dimension), and the constant 10 is an increase value of the relative isolation requirement value caused by the choke groove 104.

In accordance with an embodiment of the present invention, with combined reference to fig. 1, the spacing between the transmit antenna array 102 and the receive antenna array 103 in a second directional dimension (e.g., an azimuth dimension) (e.g., denoted as Dis)_Azi) Can be determined according to the following equation:

wherein Loss is a spatial attenuation value f of the electromagnetic wave transmitted by the transmitting antenna array 102_cMay be a center operating frequency in the operating frequency range of the imaging device.

According to an embodiment of the present invention, with reference to fig. 1, determining the number of transmit antenna elements of the transmit antenna array 102 and/or the number of receive antenna elements of the receive antenna array 103 further comprises: determining the shortest effective synthetic array length according to the beam width of the transmitting antenna unit in the first direction dimension and the shortest distance between the plane where the transmitting antenna array 102 is located and the plane where the target to be detected is located; and determining the number of transmit antenna elements and/or the number of receive antenna elements based on the shortest effective combined array length and the spacing between adjacent transmit antenna elements in the first direction dimension in the transmit antenna array 102.

According to embodiments of the present invention, with combined reference to FIG. 1, the shortest effective composite array length (e.g., denoted as L)_{minsyn_Pit}) Can be determined according to the following equation:

wherein R is the shortest distance between the plane where the transmitting antenna array 102 is located and the plane where the target to be measured is located, and θ_PitIs the beamwidth of the transmit antenna element in a first directional dimension (e.g., a pitch dimension). According to an embodiment of the present invention, L_{minsyn_Pit}Also equal to the minimum length of the transmit antenna array 102 or the receive antenna array 103 in a first direction dimension (e.g., a pitch dimension). The actual length of the transmit antenna array 102 or the receive antenna array 103 in the first direction dimension (e.g., the elevation dimension) may be determined according to the operating frequency range of the imaging device, as long as L is greater than or equal to L_{minsyn_Pit}And (4) finishing.

According to embodiments of the present invention, with reference to fig. 1 in combination, the number of transmit antenna elements and/or the number of receive antenna elements (e.g., denoted as i) may be determined according to the following equation:

i＝L_{minsyn_Pit}/Dis_Pit (9)

wherein L is_{minsyn_Pit}For the shortest effective synthesis array length, Dis_PitIs the spacing between adjacent transmit antenna elements in the transmit antenna array 102 in a first directional dimension (e.g., a pitch dimension). Those skilled in the art will appreciate that the calculated number i is the least effective number on the transmit-receive antenna array of the target imaging device. However, in order to reduce the manufacturing difficulty and size of the transceiving antenna array assembly, the transceiving antenna array of the target imaging device may be assembled by using a plurality of transceiving antenna arrays shown in fig. 1, so that the number of transmitting antenna elements or the number of receiving antenna elements on one transceiving antenna array is not necessarily greater than or equal to the number i, but may be smaller or even much smaller than the number i.

At step 504, parameters of the choke flow slot may be determined according to system requirements of the imaging device. For example, in accordance with embodiments of the present invention, with combined reference to fig. 1, system requirements (e.g., package) of an imaging device (or transceiver antenna array apparatus 100) may be based onCenter working frequency f_cIsolation requirement, size, etc.) to determine parameters of choke slot 104.

According to an embodiment of the present invention, with reference to fig. 1 in combination, determining parameters of choke groove 104 according to system requirements of an imaging device may include: the number of choke groove stages, which is equal to the number of choke grooves 104 formed on the partition wall 105, and the size of each stage of choke grooves, which includes the groove width and the groove depth of each stage of choke groove 104, are determined according to the system requirements of the image forming apparatus.

In accordance with an embodiment of the present invention, and with reference to FIG. 1 in combination, the slot width and slot depth (e.g., denoted as d, respectively) of each stage of choke slots 104_JAnd h_JWhere J is 1,2 … J, where J represents the number of choke groove stages) may be determined according to the following equation:

d_j＝λ_cj/4 (10)

h_j＝λ_cj/4 (11) wherein_cj(e.g., including λ)_c1，λ_c2……λ_cjWhere j is the number of choke groove stages) is the center operating frequency f of a number (e.g., j, where j is the number of choke groove stages) of operating frequency sub-ranges in the operating frequency range of the imaging device_cj(e.g. including f)_c1，f_c2……f_cjWhere j is the number of choke steps), wherein these frequency sub-ranges may or may not be evenly distributed in the operating frequency range of the imaging device, respectively, f_cjMay be selected from the operating frequency range of the imaging device in an equally spaced or unequally spaced manner.

According to an embodiment of the present invention, with reference to fig. 1 in combination, determining the groove width and the groove depth of each stage of the choke groove 104 according to the system requirements of the image forming apparatus may further include: determining an actual value of isolation (or referred to as an estimated value of isolation) of the transmitting and receiving antenna array apparatus 100 based on the determined parameters of the transmitting antenna array 102 and the receiving antenna array 103 and the determined parameters of the choke slot 104; and adjusting the slot width and slot depth of each stage of choke slots based at least in part on a comparison of the determined actual value of isolation to the isolation requirement value of the transceiver antenna array apparatus 100.

According to an embodiment of the present invention, referring to fig. 1 in combination, the actual value of isolation of the transmitting and receiving antenna array apparatus 100 may be an output value obtained by using electromagnetic simulation software with the determined parameters of the transmitting antenna array 102 and the receiving antenna array 103 and the determined parameters of the choke groove 104 as inputs.

According to an embodiment of the present invention, with combined reference to fig. 1 and 3, the slot width and slot depth (e.g., denoted as d, respectively) of each stage of choke slots_JAnd h_JWhere J is 1,2 … J, where J represents the choke groove order) may be iteratively adjusted based at least in part on a comparison of the determined actual value of isolation to the required value of isolation of the transceiving antenna array apparatus 100 to desirably attenuate large fluctuations in the transmission profile of the transmitting antenna elements due to surrounding receiving antenna elements, choke grooves, and metal floor.

According to an embodiment of the present invention, with reference to fig. 1 in combination, determining parameters of choke groove 104 according to system requirements of the imaging device may further include: determining the height of the partition wall 105, and determining the thickness of the teeth based on the height of the partition wall 105 and the groove width of each stage of the choke groove 104; and determines the opening direction of the choke groove 104 of each stage.

According to an embodiment of the present invention, with combined reference to fig. 4- (a), two teeth are formed on both sides of each choke groove 104, wherein each tooth may have a different or same thickness (e.g., denoted as b)_k(where k is 1,2 … j +1, where j represents the number of choke groove stages). According to an embodiment of the present invention, referring to fig. 4- (a) in combination, the thickness of each tooth may be based on the height of the partition wall 105 and the groove width (e.g., denoted as d, respectively) of each stage of the choke groove 104_JWhere J is 1,2 … J, where J represents the number of choke groove stages).

According to an embodiment of the present invention, with combined reference to fig. 2- (b), the selection of the opening direction of each stage of choke slot 104 depends mainly on the beam width requirement of the transmitting antenna element in the second directional dimension (e.g., azimuth dimension). Specifically, for example, referring to fig. 2- (b) in combination, when opening 106 of choke groove 104 faces transmit antenna array 102 due to the existence of choke groove 104, the transmit antenna element may be coupled with choke groove 104, so that the beam width of the transmit antenna element in the second direction dimension (e.g., azimuth dimension) may be larger than that in the case where opening 106 faces away from transmit antenna array 102, and thus the requirement of higher beam width may be satisfied.

Fig. 6 shows an apparatus 600 for implementing the method 500 for designing a transmit receive antenna array apparatus according to an embodiment of the invention. Method 500 may be implemented by apparatus 600 according to an embodiment of the present invention. The apparatus 600 may include a processor 601 and a memory 602.

The processor 601 may include a Central Processing Unit (CPU), a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a controller, a Field Programmable Gate Array (FPGA) device, another hardware device, a firmware device, or any combination thereof, configured to perform the operations described herein. The processor 1002 may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration (e.g., processor, CPU, FPGA, etc.).

The memory 602 may include cache memory (e.g., cache memory of the processor 601), Random Access Memory (RAM), magnetoresistive RAM (mram), Read Only Memory (ROM), Programmable Read Only Memory (PROM), Erasable Programmable Read Only Memory (EPROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory, solid state storage devices, hard drives, other forms of volatile and non-volatile memory, or combinations of different types of memory. In one embodiment, memory 602 includes a non-transitory computer-readable medium. The memory 602 may store a computer program 603 that, when executed by the processor 601, causes the processor 601 to perform the steps in the method 500.

Fig. 7 shows a graph comparing isolation requirement values of a conventional transmit-receive antenna array apparatus compared to isolation requirement values of an improved transmit-receive antenna array apparatus according to an embodiment of the invention. According to an embodiment of the present invention, referring to fig. 2- (c) in combination, in order to calculate an isolation requirement value of an improved transceiving antenna array apparatus (e.g., transceiving antenna array apparatus 100 as shown in fig. 1), waveguide ports 202-4 in a transmitting antenna array are taken as transmitting antenna units and waveguide ports 203-4 in a receiving antenna array are taken as receiving antenna units in a case where choke grooves 104 are designed. According to another embodiment of the present invention, referring to fig. 2- (c) and fig. 1 in combination, in order to calculate the isolation requirement value of the conventional transmitting-receiving antenna array apparatus, the waveguide port 202-4 in the transmitting antenna array is taken as the transmitting antenna unit and the waveguide port 203-4 in the receiving antenna array is taken as the receiving antenna unit without designing the choke groove 104. According to the embodiment of the present invention, as shown in fig. 7, in the case that the transmitting antenna units have the same beam width, the solid curve is the isolation requirement value of the improved transmitting-receiving antenna array device, and the dashed curve is the isolation requirement value of the conventional transmitting-receiving antenna array device.

For example, referring to fig. 1 and 7 in combination, in the case that the distance between the transmitting antenna array 102 and the receiving antenna array 103 in the second direction dimension (e.g., azimuth dimension) is equal to 35mm, the beam width of the transmitting antenna unit in the second direction dimension is greater than 50 °, and the operating bandwidth of the imaging device is a wide frequency band (e.g., frequency range is 28.6GHz-40GHz), the excellent performance of the transmit-receive isolation Iso < -60dB in the full frequency band is achieved, and the transmit-receive isolation index is improved by at least 10dB and generally by 12-15 dB compared with the transmit-receive array with the same azimuth dimension 3dB beam width and no tooth-shaped choke groove structure. As further shown, the solid curves show two regions of significant dips, which indicate a particularly significant improvement in the transmit-receive isolation index over the relevant local frequency range. Accordingly, in a narrow-band system where the operating bandwidth corresponds to such a local frequency range, the transmit-receive isolation index can be further improved by specific adjustment and optimization of the choke groove parameters.

Fig. 8 shows a graph reflecting standing wave characteristics of transmit antenna elements in a transceiving antenna array according to an embodiment of the present invention. According to the embodiment of the present invention, as shown in FIG. 8, the Voltage Standing Wave Ratio (VSWR) is ≦ 1.3 in the frequency range of 28.6GHz-40 GHz. Thus, a transceiving antenna array according to an embodiment of the present invention can enable: the impedance matching characteristic is good in most frequency ranges of a Ka wave band (generally having a frequency range of 27GHz-40GHz) commonly used by millimeter wave level imaging devices (such as active millimeter wave human body security devices).

Fig. 9, 10 and 11 respectively show azimuth and elevation directional patterns of the transmitting antenna unit in the transceiving antenna array apparatus 100 according to the embodiment of the present invention at a plurality of frequencies within a high frequency operating range. Specifically, as shown in fig. 9- (a) and 9- (b), 10- (a) and 10- (b), and 11- (a) and 11- (b), respectively, the central operating frequency f of the transmitting antenna unit in the frequency range of 28.6GHz-40GHz is shown_c34.3GHz and peripheral operating frequency f_L28.6GHz and f_HThe azimuth dimension directional diagram and the elevation dimension directional diagram at 40 GHz. As shown in the figure, the directional patterns at the respective frequencies have good wide beam characteristics, and better satisfy the system requirements of the imaging apparatus to which the transmitting-receiving antenna array apparatus 100 belongs.

As described above, the conventional transceiving antenna array apparatus in an imaging device (e.g., an active millimeter wave human body security device) has the following drawbacks. The quality of the isolation index of the transmitting-receiving antenna array equipment directly influences the image quality and the detection and identification effects of the imaging device. In this regard, means for increasing the isolation index, which have been widely used at present, include: the distance between the transmitting antenna array and the receiving antenna array is unconditionally increased, but extra space is occupied, and the compactness/miniaturization of the device and the actual image quality and detection effect are influenced; the metal baffle or the wave-absorbing material with a certain height is additionally arranged, but the overall section height of the transceiving antenna array is increased disadvantageously or the isolation index is improved slightly. In addition, other isolation measures based on the electromagnetic wave surface propagation principle are often only applicable to a microstrip antenna form, the bandwidth is narrow, the structure is complex, and the improvement effect of the isolation index is not great.

To this end, the present invention provides an improved design for a high isolation broadband transmit receive antenna array apparatus 100 for an imaging device. The transceiving antenna array equipment 100 solves the problems that the traditional transceiving antenna array equipment is often low in isolation index, easy to deteriorate image quality and detection effect and the like, and meanwhile, the broadband characteristic of the transceiving antenna array is also ensured due to the introduced multistage choke grooves; in addition, the design scheme of the invention has the advantages of simple operation, small processing difficulty and low cost, and can quickly manufacture the high-isolation broadband transmitting-receiving antenna array equipment applied to the imaging device without complex optimization calculation.

The apparatus and methods of the present invention have been described above with reference to various embodiments, which may include a particular feature, structure, or characteristic, but not every embodiment necessarily includes the particular feature, structure, or characteristic. In addition, some embodiments may have some, all, or none of the features described for other embodiments.

As used in the claims, unless otherwise specified the use of the ordinal adjectives "first", "second", etc., to describe a common term, merely indicate that different instances of like terms are being referred to, and are not intended to imply that the terms so described must be in a given sequence, either temporally, spatially, in ranking, or in any other manner.

Various features of different embodiments or examples may be combined in various ways with some features included and others excluded to accommodate various different applications. The figures and the foregoing description give examples of embodiments. One skilled in the art will appreciate that one or more of the described elements/components/modules/blocks may be combined into a single element/component/module/block. Alternatively, certain elements/components/modules/blocks may be divided into multiple elements/components/modules/blocks. Elements/components/modules/blocks from one embodiment may be added to another embodiment. For example, the order of the processes described herein may be changed and is not limited to the manner described herein. Moreover, the actions of any flow diagram need not be implemented in the order shown; nor does it necessarily require all acts to be performed. Further, those acts that are not dependent on other acts may be performed in parallel with the other acts. The scope of the embodiments is in no way limited by these specific examples. Many variations, such as differences in process order, product composition, and structure, are possible, whether or not explicitly set forth in the specification.

Claims

1. A transmit receive antenna array apparatus comprising:

a substrate, wherein a surface of the substrate is parallel to a two-dimensional plane consisting of a first directional dimension and a second directional dimension that are perpendicular to each other;

a transmit antenna array in which a plurality of transmit antenna elements are arranged on the substrate along the first direction dimension;

a receive antenna array in which a plurality of receive antenna elements are arranged on the substrate along the first direction dimension; and

a partition wall formed with a choke groove, wherein the partition wall is arranged on the substrate along the first direction dimension in a length direction thereof and along the second direction dimension in a width direction thereof, and the partition wall is perpendicular to a surface of the substrate in a height direction thereof, wherein the choke groove is formed on a side of the partition wall perpendicular to the surface of the substrate and extends in the length direction and the width direction of the partition wall, and wherein the choke groove does not penetrate the partition wall.

2. The transceiver antenna array apparatus of claim 1, wherein the choke groove formed on the side of the isolation wall comprises a plurality of choke grooves.

3. The transceiver antenna array apparatus of claim 2, wherein each of the plurality of choke slots has a rectangular opening in a cross section perpendicular to the length direction of the partition wall, the opening being recessed from the side of the partition wall.

4. The transceiver antenna array apparatus of claim 3, wherein a size of each of the plurality of choke slots in the cross-section is different.

5. The transceiver antenna array apparatus of claim 4, wherein a size of each of the plurality of choke slots in the cross-section corresponds to a different operating frequency.

6. The transceiver antenna array apparatus of claim 5, wherein dimensions of each of the plurality of choke grooves on the cross section include a groove width and a groove depth, wherein the groove width and the groove depth of each of the plurality of choke grooves are equal to a quarter wavelength of an operating frequency corresponding to the choke groove, and wherein the groove width is a dimension of the choke groove on the cross section in the height direction of the partition wall, and the groove depth is a dimension of the choke groove on the cross section in the width direction of the partition wall.

7. The transceiver antenna array apparatus of claim 6, wherein a tooth is formed between adjacent ones of the plurality of choke slots, wherein a thickness of the tooth is a dimension of the tooth in the height direction of the separation wall, and the thickness of the tooth depends on a height of the separation wall, a number of the plurality of choke slots, and a slot width, wherein the height of the separation wall is less than a threshold value.

8. The transmit-receive antenna array apparatus of claim 3, wherein one or more of the partition walls are disposed on one or both sides of the transmit antenna array along the second directional dimension, and one or more of the partition walls are disposed on one or both sides of the receive antenna array along the second directional dimension.

9. The transmit-receive antenna array apparatus of claim 8, wherein an opening of the choke groove formed on the side face of the partition wall arranged on one or both sides of the second direction dimension of the transmit antenna array faces the transmit antenna array, and an opening of the choke groove formed on the side face of the partition wall arranged on one or both sides of the second direction dimension of the receive antenna array faces the receive antenna array.

10. The transmit-receive antenna array apparatus of claim 8, wherein an opening of the choke groove formed on the side face of the partition wall arranged on one or both sides of the transmit antenna array in the second direction dimension faces away from the transmit antenna array, and an opening of the choke groove formed on the side face of the partition wall arranged on one or both sides of the receive antenna array in the second direction dimension faces away from the receive antenna array.

11. A method for designing a transmit receive antenna array apparatus as claimed in any one of claims 1 to 10 in an imaging device, comprising:

determining parameters of the transmit antenna array and the receive antenna array according to a spatial resolution and an operating frequency of the imaging device on a two-dimensional plane composed of a first directional dimension and a second directional dimension that are perpendicular to each other;

determining a parameter of the choke groove according to a system requirement of the imaging device.

12. The method of claim 11, wherein,

determining parameters of the transmit antenna array and the receive antenna array as a function of the spatial resolution and the operating frequency of the imaging device comprises:

determining a beamwidth of a transmit antenna element in the transmit antenna array from the spatial resolution and the operating frequency of the imaging device;

determining an effective size of the transmit antenna element as a function of a beam width of the transmit antenna element in the two-dimensional plane and the operating frequency of the imaging device;

determining a spacing associated with the transmit antenna array and the receive antenna array based on the spatial resolution of the imaging device;

determining a parameter of the choke groove as a function of the system requirements of the imaging device comprises:

determining a number of choke groove stages equal to the number of choke grooves formed on the side surface of the separation wall and a size of each stage of choke grooves including a groove width and a groove depth of the each stage of choke grooves according to the system requirements of the image forming apparatus.

13. The method of claim 12, wherein the groove width and the groove depth of each stage of choke grooves are initially set equal to a quarter wavelength of an operating frequency corresponding to the stage of choke grooves, wherein determining the groove width and the groove depth of each stage of choke grooves based on the system requirements of the imaging device further comprises:

determining an isolation value of the transmitting antenna array device according to the parameters of the transmitting antenna array and the receiving antenna array and the parameters of the choke slot; and

adjusting a slot width and a slot depth of the per-stage choke slots based at least in part on a comparison of the determined isolation value to an isolation requirement value of the transceiver antenna array apparatus.

14. The method of claim 13, wherein determining the parameters of the choke slot further comprises:

determining a height of the separation wall, and determining a thickness of teeth between adjacent choke grooves based on the height of the separation wall and a groove width of the choke groove of each stage; and

the opening direction of the choke groove is determined.

15. The method of claim 12, wherein determining the beamwidths of the transmit antenna elements in the transmit antenna array further comprises:

determining a beamwidth of the transmit antenna element in the first directional dimension as a function of the operating frequency and a spatial resolution of the imaging device in the first directional dimension; and

determining a beamwidth of the transmit antenna element in the second directional dimension as a function of the operating frequency and a spatial resolution of the imaging device in the second directional dimension.

16. The method of claim 15, wherein determining the effective size of the transmit antenna element further comprises:

determining an effective size of the transmit antenna element in the first direction dimension as a function of the operating frequency and a beamwidth of the transmit antenna element in the first direction dimension; and

determining an effective size of the transmit antenna element in the second directional dimension as a function of the operating frequency and a beamwidth of the transmit antenna element in the second directional dimension.

17. The method of claim 12, wherein determining a spacing associated with the transmit antenna array and the receive antenna array further comprises:

determining a spacing between adjacent transmit antenna elements in the transmit antenna array in the first directional dimension according to a spatial resolution in the first directional dimension; and

determining a spacing between the transmit antenna array and the receive antenna array in the second direction dimension according to an isolation requirement value of the imaging device.

18. The method of claim 17, wherein determining a spacing between the transmit antenna array and the receive antenna array in the second directional dimension further comprises:

determining a spatial attenuation value of the electromagnetic wave transmitted by the transmitting antenna array based on an isolation requirement value of the imaging device, a gain value of the transmitting antenna unit in the second direction dimension obtained based on an effective size of the transmitting antenna unit, and a predicted increase value from the isolation requirement value predicted to be brought by the choke groove; and

determining a spacing between the transmit antenna array and the receive antenna array in the second directional dimension as a function of the spatial attenuation values.

19. The method of claim 17, wherein determining parameters of the transmit antenna array and the receive antenna array further comprises: determining a number of transmit antenna elements of the transmit antenna array and a number of receive antenna elements of the receive antenna array,

wherein determining the number of transmit antenna elements of the transmit antenna array and the number of receive antenna elements of the receive antenna array further comprises:

determining the shortest effective synthetic array length according to the beam width of the transmitting antenna unit in the first direction dimension and the shortest distance between the plane where the transmitting antenna array is located and the plane where the target to be detected is located; and

determining the number of transmit antenna elements and the number of receive antenna elements from the shortest effective combined array length and a spacing between adjacent transmit antenna elements in the transmit antenna array in the first direction dimension.

20. An apparatus for designing a transmit receive antenna array device, comprising:

a memory storing a computer program;

a processor coupled to the memory and configured to cause the processor to perform the method of any of claims 11-19 when the computer program is executed.

21. An image forming apparatus comprising:

the transmit receive antenna array apparatus of any of claims 1-10;

one or more processing units for controlling the transmit antenna array apparatus to transmit a beam and forming an image based on the beam received by the transmit antenna array apparatus.

22. A method for manufacturing a transceiving antenna array apparatus according to any of claims 1-10, comprising:

mounting the transmit antenna array on the substrate;

mounting the receive antenna array on the substrate;

the partition wall formed with the choke groove is mounted on the substrate.