Patent Application
20230299454
This application claims the benefit of Korean Patent Application No. 10-2022-0032382 filed on Mar. 15, 2022, in the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference for all purposes.
One or more embodiments relate to a waveguide-stripline feed transition element having a radiating function.
A frequency-scan array antenna having a mono-pulse function includes a combination of a plurality of sub-arrays provided with power from a series-feed circuitry. Each sub-array provides electronic beam scan characteristics by using a mounted phase shifter element. Much research is ongoing to improve the efficiency of an opening of the array antenna and reduce a side lobe level characteristic by using a waveguide-stripline feed transition element included in the sub-array and to improve the performance of the antenna by reducing a physical size of the array antenna.
According to an aspect, there is provided a waveguide-stripline feed transition element including a lower element in which a waveguide feed port is arranged, an upper element including a slot opening configured to radiate a portion of input power transmitted through the waveguide feed port to a free space, and a circuit board including a strip feed port configured to transmit remaining input power except for the portion of the input power radiated through the slot opening, the circuit board being arranged between the upper element and the lower element.
The strip feed port may include a first strip feed port configured to transmit the remaining input power except for the portion of the input power radiated through the slot opening in a first direction and a second strip feed port configured to transmit the remaining input power in a second direction, opposite to the first direction.
The waveguide-stripline feed transition element may be configured to adjust an amount of the remaining input power transmitted to a waveguide-stripline and an amount of the portion of the input power radiated to the free space, according to at least one of an offset distance from a center line of the slot opening, a width of the slot opening, and a length of the slot opening.
The amount of the portion of the input power radiated to the free space may decrease as the offset distance from the center line of the slot opening increases.
The amount of the portion of the input power radiated to the free space may increase as at least one of the width of the slot opening and the length of the slot opening increases.
The strip feed port may include a small miniature assembly (SMA) connector port.
The circuit board may further include a conductive via-hole.
According to an aspect, there is provided an antenna including a plurality of waveguide-stripline feed transition elements arranged in a horizontal direction or a vertical direction. The waveguide-stripline feed transition element may include a lower element in which a waveguide feed port is arranged, an upper element including a slot opening configured to radiate a portion of input power transmitted through the waveguide feed port to a free space, and a circuit board including a strip feed port configured to transmit remaining input power except for the portion of the input power radiated through the slot opening, the circuit board being arranged between the upper element and the lower element.
The strip feed port may include a first strip feed port configured to transmit the remaining input power except for the portion of the input power radiated through the slot opening in a first direction and a second strip feed port configured to transmit the remaining input power in a second direction, opposite to the first direction.
The waveguide-stripline feed transition element may be configured to adjust an amount of the remaining input power transmitted to a waveguide-stripline and an amount of the portion of the input power radiated to the free space, according to at least one of an offset distance from a center line of the slot opening, a width of the slot opening, and a length of the slot opening.
The amount of the portion of the input power radiated to the free space may decrease as the offset distance from the center line of the slot opening increases.
The amount of the portion of the input power radiated to the free space may increase as at least one of the width of the slot opening and the length of the slot opening increases.
The strip feed port may include an SMA connector port.
The circuit board may further include a conductive via-hole.
The plurality of arranged waveguide-stripline feed transition elements may be disconnected from each other and have a same radiation characteristic.
Additional aspects of embodiments will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the disclosure.
These and/or other aspects, features, and advantages of the invention will become apparent and more readily appreciated from the following description of embodiments, taken in conjunction with the accompanying drawings of which:
The following detailed structural or functional description is provided as an example only and various alterations and modifications may be made to the embodiments. Here, embodiments are not construed as limited to the disclosure and should be understood to include all changes, equivalents, and replacements within the idea and the technical scope of the disclosure.
Terms, such as first, second, and the like, may be used herein to describe various components. Each of these terminologies is not used to define an essence, order or sequence of a corresponding component but used merely to distinguish the corresponding component from other component(s). For example, a first component may be referred to as a second component, and similarly the second component may also be referred to as the first component.
It should be noted that if it is described that one component is “connected”, “coupled”, or “joined” to another component, a third component may be “connected”, “coupled”, and “joined” between the first and second components, although the first component may be directly connected, coupled, or joined to the second component.
The singular forms “a”, “an”, and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises/including” and/or “includes/including” when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groups thereof.
Unless otherwise defined, all terms, including technical and scientific terms, used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. Terms, such as those defined in commonly used dictionaries, are to be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art, and are not to be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. When describing the embodiments with reference to the accompanying drawings, like reference numerals refer to like constituent elements and a repeated description related thereto will be omitted.
In a waveguide-stripline feed transition element included in a conventional array antenna, a function of radiating power to a free space is absent. When sub-arrays are formed with waveguide-stripline feed transition elements without a radiation function and the sub-arrays are arranged to form a linear array antenna, a distance between the sub-arrays are spaced apart by a distance identical to a distance between the waveguide-stripline feed transition elements. In this case, a side lobe level characteristic, of which power is radiated in directions other than a main beam in horizontal direction patterns of an antenna directivity of an entire array antenna, may increase. Usually, when power is fed through a waveguide, a range of the electronic beam scan decreases as a particular side lobe level increases, leading to a reduction of performance of the array antenna. In addition, when the distance between the sub-arrays are spaced apart as in the prior art, although the directivity increases following an increase in a physical size of the entire array antenna, a non-radiation zone is generated between the sub-arrays, reducing an efficiency of an opening of the array antenna and thus causing reduction in the overall performance. Hereinafter, disclosed are a configuration and performance of the waveguide transition element for improving the performance of the array antenna through the configuration of the waveguide transition element radiating power to the upper free space.
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An amount of the power radiated to the free space may increase as at least one of the width 510 of the slot opening and the length 520 of the slot opening increases. When the offset location 540 of the slot opening of
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Here, F(θ) denotes radiation patterns of a linear array antenna, f(θ) denotes radiation patterns of the unit-arranged elements, An denotes an amplitude coefficient of the unit-arranged elements, θ denotes an observation angle, N denotes a number of array elements, dx denotes a spacing between the array elements, and β denotes a propagation constant (=2π/λc).
When a radiation patterns graph 710, in which a conventional waveguide feed port is used, is compared to a radiation patterns graph 720, in which a waveguide-stripline feed transition element having a radiation function is used, for example, a side lobe level characteristic may decrease and a 3 dB beam width may increase by about 0.9°. Through the comparison, it may be confirmed that when the waveguide-stripline feed transition element having a radiation function is used, an antenna efficiency increases under a condition of an array antenna having a same array and a range of an electronic beam scan increases.
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The components described in the embodiments may be implemented by hardware components including, for example, at least one digital signal processor (DSP), a processor, a controller, an application-specific integrated circuit (ASIC), a programmable logic element, such as a field programmable gate array (FPGA), other electronic devices, or combinations thereof. At least some of the functions or the processes described in the embodiments may be implemented by software, and the software may be recorded on a recording medium. The components, the functions, and the processes described in the embodiments may be implemented by a combination of hardware and software.
Embodiments described herein may be implemented using a hardware component, a software component, and/or a combination thereof. A processing device may be implemented using one or more general-purpose or special-purpose computers, such as, for example, a processor, a controller and an arithmetic logic unit (ALU), a DSP, a microcomputer, an FPGA, a programmable logic unit (PLU), a microprocessor, or any other device capable of responding to and executing instructions in a defined manner. The processing device may run an operating system (OS) and one or more software applications that run on the OS. The processing device also may access, store, manipulate, process, and create data in response to execution of the software. For purpose of simplicity, the description of a processing device is singular; however, one skilled in the art will appreciate that a processing device may include multiple processing elements and multiple types of processing elements. For example, the processing device may include a plurality of processors, or a single processor and a single controller. In addition, different processing configurations are possible, such as parallel processors.
The software may include a computer program, a piece of code, an instruction, or some combination thereof, to independently or uniformly instruct or configure the processing device to operate as desired. Software and data may be embodied permanently or temporarily in any type of machine, component, physical or virtual equipment, computer storage medium or device, or in a propagated signal wave capable of providing instructions or data to or being interpreted by the processing device. The software also may be distributed over network-coupled computer systems so that the software is stored and executed in a distributed fashion. The software and data may be stored by one or more non-transitory computer-readable recording mediums.
The methods according to the embodiment described above may be recorded in non-transitory computer-readable media including program instructions to implement various operations of the embodiments described above. The media may also include, alone or in combination with the program instructions, data files, data structures, and the like. The program instructions recorded on the media may be those specially designed and constructed for the purposes of an embodiment, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of non-transitory computer-readable media include magnetic media such as hard disks, floppy disks, and magnetic tape; optical media such as CD-ROM discs, DVDs, and/or Blue-ray discs; magneto-optical media such as optical discs; and hardware devices that are specially configured to store and perform program instructions, such as read-only memory (ROM), random access memory (RAM), flash memory (e.g., USB flash drives, memory cards, memory sticks, etc.), and the like. Examples of program instructions include both machine code, such as produced by a compiler, and files containing higher-level code that may be executed by the computer using an interpreter.
The devices described above may be configured to act as one or more software modules in order to perform the operations of the embodiments described above, or vice versa.
As described above, although the embodiments have been described with reference to the limited drawings, a person skilled in the art may apply various technical modifications and variations based thereon. For example, suitable results may be achieved if the described techniques are performed in a different order and/or if components in a described system, architecture, device, or circuit are combined in a different manner and/or replaced or supplemented by other components or their equivalents.
Therefore, the scope of the disclosure is defined not by the detailed description, but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents are to be construed as being included in the disclosure.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2022-0032382 | Mar 2022 | KR | national |
