WO2019216692A1 - Quadrifilar antenna device - Google Patents

Abstract

An S-band quadrifilar antenna device having a stop band is disclosed. A quadrifilar antenna device according to an embodiment comprises: a quadrifilar antenna; and a feeding circuit for generating feeding signals from an input signal by using a coupler and a distributor, and outputting the feeding signals to the quadrifilar antenna, wherein the feeding circuit includes a filter disposed on at least one of a plurality of signal paths through which the input signal is transferred to the coupler and the distributor.

Description

Quad refiller antenna device

The following embodiments relate to an S-band quad refiller antenna device having a cutoff band.

Quad refiller antenna is a type of antenna used for satellite communication in a device such as a mobile terminal or a GPS receiver. Quad refiller antennas provide circularly polarized radiation and are designed to have a quarter-wave or half-wavelength structure with shorted ends.

The quad refiller antenna is an electrical microantenna for providing circular polarization in the angular region of the blog. Quad refiller antennas generally consist of four helices, each helix formed identically on the circumferential surface of a dielectric cylinder or dielectric disc support, and fed with a signal of the same amplitude with four phases applied, respectively. .

The quad refiller antenna required performance only within the S-band, but it is necessary to block unnecessary signal components such as interference with other antennas and to reduce radiation performance in a specific band.

Embodiments can provide a technique of applying a band pass filter to a feeder circuit with a printed circuit on a substrate without using passive elements to block unwanted signal components in a particular band.

Quad refiller antenna apparatus according to an embodiment comprises a quadrature refiller antenna, a feeder circuit for generating an input signal as a feed signal using a coupler and a divider, and outputs the feed signal to a quadriple filler antenna, The feed circuit includes a filter disposed on at least one of a plurality of signal paths for delivering the input signal to the coupler and divider.

The filters may be arranged in parallel with respect to the at least one path.

The filter may be a band pass filter.

The filter may include a first filter disposed in any one of the plurality of signal paths, and a second filter disposed in any other of the plurality of signal paths.

The filter may be implemented in a printed circuit.

As a result, the present invention has an effect of providing a technique of applying a band pass filter to a power supply circuit with a printed circuit on a substrate without using a passive element to cut off unnecessary signal components in a specific band.

1 is a schematic structural diagram of a quad refiller antenna device according to an embodiment.

2 illustrates an example of the power supply circuit shown in FIG. 1.

3 is an equivalent circuit diagram of the filter shown in FIG. 2.

4 is an example of a graph for describing the performance of the quad refiller antenna device shown in FIG. 1.

FIG. 5 is another example of a graph for describing the performance of the quad refiller antenna device shown in FIG. 1.

FIG. 6 is another example of a graph for describing the performance of the quad refiller antenna device shown in FIG. 1.

FIG. 7 is another example of a graph for describing the performance of the quad refiller antenna device shown in FIG. 1.

Hereinafter, exemplary embodiments will be described in detail with reference to the accompanying drawings. However, various changes may be made to the embodiments so that the scope of the patent application is not limited or limited by these embodiments. It is to be understood that all changes, equivalents, and substitutes for the embodiments are included in the scope of rights.

The terminology used herein is for the purpose of description and should not be construed as limiting. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as "comprise" or "have" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof described on the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Terms such as first or second may be used to describe various components, but the components should not be limited by the terms. The terms are for the purpose of distinguishing one component from another component only, for example, without departing from the scope of the rights according to the concepts of the embodiment, the first component may be named a second component, and similarly The second component may also be referred to as the first component.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

In addition, in the description with reference to the accompanying drawings, the same components regardless of reference numerals will be given the same reference numerals and duplicate description thereof will be omitted. In the following description of the embodiment, when it is determined that the detailed description of the related known technology may unnecessarily obscure the gist of the embodiment, the detailed description thereof will be omitted.

1 is a schematic structural diagram of a quad refiller antenna device according to an embodiment.

Referring to FIG. 1, a quadrefilar antenna apparatus 100 includes a quadrefiller antenna 110 and a power feeding circuit 130.

The quad refiller antenna device 100 may be implemented in a radio frequency identification (RFID), a global positioning system (GPS), a satellite, or the like. In addition, the quad refiller antenna device 100 may be implemented in a personal computer (PC), a data server, or a portable electronic device.

Portable electronic devices include laptop computers, mobile phones, smart phones, tablet PCs, mobile internet devices (MIDs), personal digital assistants (PDAs), enterprise digital assistants (EDAs). ), Digital still cameras, digital video cameras, portable multimedia players (PMPs), personal navigation devices or portable navigation devices (PNDs), handheld consoles, e-books ( It may be implemented as an e-book or a smart device. For example, the smart device may be implemented as a smart watch or a smart band.

The quad refiller antenna 110 may include a plurality of radiating elements. The plurality of radiating elements may emit radiating signals in response to the feeding signals transmitted from the feeding circuit 130. The plurality of radiating elements may be electrically connected to the power feeding circuit 130.

For example, the plurality of radiating elements may be formed in a helix structure. In addition, the plurality of radiating elements may be formed in various shapes such as straight lines and diagonal lines. In this case, the plurality of radiating elements may be electrically connected, and a distance between the plurality of radiating elements may be constant.

The feed circuit 130 may transmit feed signals to a plurality of radiating elements included in the quad refiller antenna 100. That is, the power supply circuit 130 may power the plurality of fireproof elements through the power supply signals. For example, the feed signals may be signals having a phase difference.

The feed signals may be generated from the feed circuit 170, but are not necessarily limited thereto. For example, the feed signals may be power (or current or voltage) supplied from the outside. That is, the power supply circuit 130 may supply power, for example, feed signals from the outside to feed the radiating elements.

2 illustrates an example of the power supply circuit shown in FIG. 1, and FIG. 3 is an equivalent circuit diagram of the filter illustrated in FIG. 2.

2 and 3, the power supply circuit 130 may connect the input port 131, the coupler 133, the divider 135, the filter 137, and the plurality of signal paths SP1 to SP4. Include. The input port 131 may be configured of a plurality of input ports, and the distributor 135 may also be configured of a plurality of distributors.

The feeder circuit 130 may generate signals input to the input port 131 as feed signals output to the quadrefiller antenna 110 through the coupler 133 and the divider 135.

The signal input to the input port 131 may be transmitted to the coupler 133 and the divider 135 through the plurality of signal paths SP1 to SP4. For example, signal paths SP1 and SP2 may be located between input port 131 and coupler 133, and signal paths SP3 and SP4 may be located between coupler 133 and divider 135. have.

The filter 137 may be disposed on at least one path among the plurality of signal paths SP1 to SP4. For example, the filters 137 may be disposed in parallel with respect to at least one path. The filter 137 may be a bandpass filter, and may block unnecessary signal components in a specific band.

The filter 137 may include an inductor L and a capacitor C. One end of the inductor L and the capacitor C may be connected to the signal path, and the other end may be connected to the ground.

The filter 137 may include a plurality of filters. For example, when one filter is disposed on any one of the plurality of signal paths SP1 to SP4, the other filter is disposed on the other one of the plurality of signal paths SP1 to SP4. Can be deployed.

Each of the components of the power supply circuit 130, for example, the coupler 133, the divider 135, the filter 137, and the plurality of signal paths SP1 to SP4 may be implemented as a printed circuit on a substrate. have. In addition, the filter 137 may also be implemented as a printed circuit on the substrate. For example, the substrate can be a PCB and / or an FPCB.

As described above, the quad refiller antenna device 100 may block unnecessary signal components in a specific band through the filter 137, and may deteriorate radiation performance in a specific band. Since the filter 137 is implemented as a printed circuit on a substrate without using a passive element, the filter 137 may be easily manufactured and may be effectively used when performance is required in a specific band due to low loss in a pass band.

Hereinafter, the performance of the quad refiller antenna will be described by comparing the feeder circuit 130 including the filter 137 with the conventional feeder circuit in which the filter 137 is omitted.

4 and 5 are graphs for explaining the performance of the quad refiller antenna device shown in FIG.

4 and 5 are graphs of performance using a conventional power supply circuit in which the filter 137 is omitted, and graph (b) is a performance graph using a power supply circuit 130 including a filter 137.

4 shows the output insertion loss for each circuit. The loss difference is small in the main band, 2 ~ 2.3GHz, and the band blocking occurs in 3.5 ~ 4.5GHz, 8 ~ 9GHz.

5 shows radiation performance including each circuit and quadrefill antenna. A gain difference of less than 1dB in the s-band shows that the loss due to the filter in the s-band is small.

6 and 7 are other graphs for describing the performance of the quad refiller antenna device shown in FIG. 1.

In FIG. 6 and FIG. 7, the solid line represents the performance of the quad refiller antenna device in which the filter 137 is omitted, and the dotted line represents the performance of the quad refiller antenna device in which the filter 137 is implemented.

In Figure 6, it can be seen that the maximum gain at 3-4 GHz shows a radio performance degradation of more than 10dB per frequency.

In Figure 7 it can be seen that even in the 8-9GHz band shows a deterioration in radiation performance and more than 4dB difference.

5 to 7, the quadrefiller antenna device 100 according to the embodiment may block unnecessary signal components in a specific band through the filter 137, and may deteriorate radiation performance in a specific band. have. Quad refiller antenna device 100 may be effectively used when the loss in the pass band is required to reduce the performance in a specific band.

The method according to the embodiment may be embodied in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. The program instructions recorded on the media may be those specially designed and constructed for the purposes of the embodiments, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

The software may include a computer program, code, instructions, or a combination of one or more of the above, and configure the processing device to operate as desired, or process it independently or collectively. You can command the device. Software and / or data may be any type of machine, component, physical device, virtual equipment, computer storage medium or device in order to be interpreted by or to provide instructions or data to the processing device. Or may be permanently or temporarily embodied in a signal wave to be transmitted. The software may be distributed over networked computer systems so that they may be stored or executed in a distributed manner. Software and data may be stored on one or more computer readable recording media.

Although the embodiments have been described with reference to the accompanying drawings as described above, those skilled in the art may apply various technical modifications and variations based on the above. For example, the described techniques may be performed in a different order than the described method, and / or components of the described systems, structures, devices, circuits, etc. may be combined or combined in a different form than the described method, or other components. Or even if replaced or substituted by equivalents, an appropriate result can be achieved.

Therefore, other implementations, other embodiments, and equivalents to the claims are within the scope of the following claims.

Claims (4)

Quad refiller antenna; A feeder circuit generates an input signal as feed signals using a coupler and a divider, and outputs the feed signals to a quad refiller antenna. Including, The power supply circuit, A filter disposed on at least one of a plurality of signal paths for delivering the input signal to the coupler and divider Quad refiller antenna device comprising a. The method of claim 1, And the filter is disposed in parallel with respect to the at least one path. The method of claim 1, And said filter is a band pass filter. The method of claim 1, The filter, A first filter disposed in any one of the plurality of signal paths; And A second filter disposed in any one of the plurality of signal paths Quad refiller antenna device comprising a.

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