EP2237371A2 - Feed network structure and arrangement method of planar waveguide antenna - Google Patents

Feed network structure and arrangement method of planar waveguide antenna Download PDF

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Publication number
EP2237371A2
EP2237371A2 EP09704021A EP09704021A EP2237371A2 EP 2237371 A2 EP2237371 A2 EP 2237371A2 EP 09704021 A EP09704021 A EP 09704021A EP 09704021 A EP09704021 A EP 09704021A EP 2237371 A2 EP2237371 A2 EP 2237371A2
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EP
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Prior art keywords
line
power
signal
type
structure
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EP09704021A
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German (de)
French (fr)
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EP2237371A4 (en
Inventor
Kyeong-Hwan Jeong
Ju-Wan Kim
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Microfaceinc Co Ltd
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Microfaceinc Co., Ltd
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Priority to KR20080008234 priority Critical
Application filed by Microfaceinc Co., Ltd filed Critical Microfaceinc Co., Ltd
Priority to PCT/KR2009/000385 priority patent/WO2009093875A2/en
Publication of EP2237371A2 publication Critical patent/EP2237371A2/en
Publication of EP2237371A4 publication Critical patent/EP2237371A4/en
Application status is Withdrawn legal-status Critical

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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00Antenna arrays or systems
    • H01Q21/0006Particular feeding systems
    • H01Q21/0037Particular feeding systems linear waveguide fed arrays
    • H01Q21/0043Slotted waveguides
    • H01Q21/005Slotted waveguides arrays
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01PWAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P5/00Coupling devices of the waveguide type
    • H01P5/12Coupling devices having more than two ports
    • H01P5/16Conjugate devices, i.e. devices having at least one port decoupled from one other port
    • H01P5/19Conjugate devices, i.e. devices having at least one port decoupled from one other port of the junction type
    • H01P5/20Magic-T junctions
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00Antenna arrays or systems
    • H01Q21/06Arrays of individually energised antenna units similarly polarised and spaced apart
    • H01Q21/061Two dimensional planar arrays
    • H01Q21/064Two dimensional planar arrays using horn or slot aerials

Abstract

Provided are a structure of a feeding network for a flat-type waveguide antenna and an array method thereof. In particular, by a structure of a feeding network for a flat-type waveguide antenna including a waveguide receiving a signal to be radiated, a T-type power divider including a first line receiving applied power, a second line receiving asymmetrically divided power, and a third line receiving power divided asymmetrically with the second line, wherein the signal is transmitted by adjusting a phase and an impedance of the signal, and a cell resonating and radiating the signal, the level of a side-lobe is lowered, thereby preventing wireless interference and jamming to adjacent base station and wiretapping.

Description

    [Technical Field]
  • The present invention relates to a feeding network that divides large power to the center of a flat-type waveguide antenna and divides power of a selected level toward the outside, and more particularly, to a structure of a feeding network for a flat-type waveguide antenna and an array method thereof that controls an power level of a side lobe because a large power level is divided to a cell positioned at the center and a level by designing is fed toward the outside by using a T type power divider.
  • [Background Art]
  • A frequency used in wireless communication is divided into various bandwidths. The higher the frequency is, the shorter a wavelength is. An electric length of an antenna is shortened and the linearity of an electric wave is excellent, such that the electric wave is generally transmitted far away with low power.
  • A micro wave, which is an electromagnetic wave in which a wavelength λ of a wireless frequency is in the range of 1 mm (300 Hz) to 1 m (30 GHz), has excellent linearity, such that the micro wave is primarily used to remotely communicate using comparatively low power in a space without obstacles. In particular, the micro wave is primarily used for communication between a ground base station and other base stations or an artificial satellite on the earth's orbit.
  • The antenna ANT is used for both transmitting TX and receiving RX of an electric signal by the electromagnetic wave and the transmitting TX is described for simple description and easy understanding and as necessary, the receiving RX is limitedly described in the present invention.
  • Conductors such as an electric wire, a coaxial cable, and the like are generally used to transmit the electric signal and in the case of a signal having a high frequency, a physical phenomenon in which current flows on the surface of the conductor appears by a skin effect. By using the phenomenon, a metal tube or pipe or a waveguide of which an inner part is plugged with a metallic conductor is used to transmit a signal having a comparatively short frequency such as a micro wave signal.
  • The waveguide which transmits the electromagnetic wave through a cavity in the metal tube, completely separates and isolates the electromagnetic wave from an external electromagnetic field to prevent noise introduced from the outside from being isolated and prevent the electromagnetic wave from being radiated to the outside. Further, the waveguide is very low in resistance loss and dielectric loss by transmission. Since the cross section of the waveguide is related to the length of the wavelength, a mode of a signal transmitted in the waveguide has a predetermined isolation wavelength. The waveguide serves as a filter that prevents a signal having a longer wavelength than the isolation wavelength from being passed and transmits a signal having a large output. A cross-sectional shape of the waveguide includes, for example, a square shape, a rectangular shape, a circular shape, an oval shape, and the like. The cross-sectional size of the waveguide is determined by the lowest frequency (isolation frequency) which is transmissible. A size having a length of a half-wavelength or more is used as the cross-sectional size, which is primarily used in a micro wave bandwidth of 1 GHz or more. In the case in which the waveguide is used as the antenna, the waveguide is referred to as a waveguide antenna. The waveguide antenna is classified into a slot antenna and a horn antenna on the basis of a structure in which a wireless signal is radiated.
  • The present invention describes a flat-type waveguide antenna in which a plurality of waveguide antennas are regularly arranged on the same surface and which wirelessly performs transmission and reception.
  • A general configuration of the waveguide antenna will schematically be described. The waveguide antenna includes an antenna that transmits and receives the wireless signal by the electromagnetic wave and a waveguide that transmits transmission and reception signals. The waveguide antenna further includes a T-type power divider that divides or synthesizes power. The waveguide is constituted by a conductive upper panel and a conductive lower panel that are formed in a facing structure divided into an upper surface and a lower surface. The antenna of the upper panel has a structure opened through the upper surface, and transmits and receives the wireless signal through the opened shape.
  • Each of the antennas constituting the flat-type antenna is referred to as a cell. Directionality and a gain of a radiation pattern of the electromagnetic wave are increased by arranging a plurality of cells on the same surface at regular intervals. A flat-type waveguide antenna is formed by applying the waveguide antenna to each cell.
  • A structure providing a signal to each of the antennas constituted by the plurality of cells is a feeding network. The feeding network includes the waveguide transmitting the signal, and symmetric and asymmetric T-type power dividers dividing or synthesizing the power of the signal.
  • The antenna which is used to transmit and receive the wireless signal includes a pattern radiating electromagnetic waves on the basis of transmission. A pattern in which a signal of a predetermined frequency is radiated with an output of the largest electric field or a large level is referred to as a main-lobe and a pattern in which the same signal or a harmonic wave is radiated with a low electric field is referred to as a side-lobe. The main-lobe which radiates the signal in 360° is classified into a non-directional antenna (isotropic antenna or omnidirectional antenna) and the main-lobe which radiates a large electric field in a predetermined direction is classified into a directional antenna. The non-directional antenna is attached with a reflection plate to be used as the directional antenna.
  • The flat-type antenna of the present invention is one kind of directional antenna and causes interference by a comparatively large side-lobe.
  • Further, since interference by the side-lobe occurs during communication between base stations using different frequencies, communication in an area adjacent to a plurality of countries, communication in an area where artificial satellites are densely arranged, and the like, a communication failure occurs by confusing a propagation environment and a security problem in which a communication content is exposed by wiretapping occurs.
  • In order to solve some of the problems in the prior art, a technology of accurately matching directions of the main-lobes of the transmitter and the receiver with each other and evading the direction of the side-lobe has been researched.
  • The improved prior art has an advantage of normally performing wireless communication without being influenced by jamming when beam directions of the main-lobes of the transmitter and the receiver are accurately matched with each other.
  • However, since even the improved prior art does not reduce the side-lobe but evade the side-lobe, the side-lobe may cause propagation interference to adjacent base stations or wiretapping by the adjacent base stations and deteriorates a circumferential propagation environment.
  • Therefore, a technology that reduces an influence of noise caused by the side-lobe by making a difference between a level of the signal outputted to the main-lobe and a level of a signal outputted to the side largely needs to be developed.
  • [Disclosure] [Technical Problem]
  • The present invention is contrived to solve the problems and necessities of the prior art. There is an object of the present invention to provide a structure of a feeding network for a flat-type waveguide antenna and an array method thereof that lower the level of a side-lobe by optionally arraying asymmetric and symmetric T-type power dividers through designing.
  • Further, there is another object of the present invention to provide a structure of a feeding network for a flat-type waveguide antenna and an array method thereof that controls phases and impedances of signals divided into branch lines in a T-type power divider.
  • In addition, there is yet another object of the present invention to provide a structure of a feeding network for a flat-type waveguide antenna and an array method thereof that efficiently transfers signals without a loss by matching phases and impedances of signals divided by a T-type power divider.
  • Besides, there is still another object of the present invention to provide a structure of a feeding network for a flat-type waveguide antenna and an array method thereof that remove noise caused by a side-lobe by controlling a radiation pattern of the flat-type waveguide antenna.
  • [Technical Solution]
  • In order to achieve the above-mentioned objects, an exemplary embodiment of the present invention provides a structure of a feeding network for a flat-type waveguide antenna that includes: a waveguide receiving and transmitting signal having predetermined power to be radiated by the flat-type waveguide antenna; a T-type power divider including a first line receiving power of the signal applied from the waveguide, a second line receiving power of a signal asymmetrically divided by a ratio between an inlet width of the second line itself and an inlet width of a third line asymmetrically forming the power of the signal applied from the first line, and transmitting the received signal power by changing the transmission direction, and a third line receiving power of a signal asymmetrically divided by a ratio between the inlet width of the third line itself and the inlet width of the second line asymmetrically forming the power of the signal applied from the first line, wherein the inlet width of the second line is larger than that of the third line, and the second line and the third line transmit the asymmetrically divided signals by adjusting phases and impedances of the corresponding signals; and a cell resonating and radiating the power signals divided and received from the T-type power divider.
  • Preferably, the second line further includes a first upper reflector changing a transmission direction of the signal divided and received from the first line.
  • Further, the third line further includes a second lower reflector changing the transmission direction of the signal divided and received from the first line.
  • Further, the third line further includes a second upper reflector changing a transmission direction of the signal received from the second lower reflector.
  • In addition, the third line further includes a step transformer matching a phase and an impedance of the signal received from the second upper reflector with each other.
  • Besides, the step transformer is provided on at least one of an upper part and a lower part of the third line.
  • Moreover, at least one step transformer is optionally provided in the third line.
  • In order to achieve the above-mentioned objects, another embodiment of the present invention provides a structure of a feeding network for a flat-type waveguide antenna that includes: a waveguide receiving and transmitting signal having predetermined power to be radiated by the flat-type waveguide antenna; a T-type power divider including a first line receiving power of the signal applied from the waveguide, a second line receiving the power of the signal applied from the first line as power of a signal divided by a ratio between an inlet width of the second line itself and an inlet width of a third line, and transmitting the received signal power by changing the transmission direction, and a third line receiving the power of the signal applied from the first line as power of a signal divided by a ratio between the inlet width of the third line itself and the inlet width of the second line, wherein the second line and the third line transmit the asymmetrically divided signals by adjusting phases and impedances of the corresponding signals; and a cell resonating and radiating the power signals divided and received from the T-type power divider.
  • Preferably, the second line further includes: a first lower reflector changing a transmission direction of the signal received from the first line; and a first upper reflector changing a transmission direction of the signal received from the first lower reflector.
  • In addition, the second line further includes a step transformer matching a phase and an impedance of the signal received from the first upper reflector with each other.
  • Besides, the step transformer is provided on at least one of an upper part and a lower part of the second line.
  • Moreover, at least one step transformer is optionally provided in the second line and matches the phase and impedance of the received signal with each other.
  • Further, the third line further includes: a second lower reflector changing a transmission direction of the signal received from the first line; and a second upper reflector changing a transmission direction of the signal received from the second lower reflector.
  • In addition, the third line further includes a step transformer matching a phase and an impedance of the signal received from the second upper reflector with each other.
  • Besides, at least one step transformer is optionally provided on at least one of an upper part and a lower part of the third line and matches the phase and impedance of the received signal with each other.
  • Moreover, the first line optionally further includes at least one input step transformer matching a phase and an impedance of the signal received from the waveguide with each other.
  • Further, an inlet width of the second line and an inlet width of the third line are formed in at least one selected from a symmetric structure or an asymmetric structure.
  • In addition, the first line transmits the power of the inputted signal at least one selected between straightly and obliquely.
  • Besides, the third line reduces the width of the inlet by combining a conductor to the inlet.
  • Moreover, the third line reduces the width of the inlet by forming a protrusion at the inlet.
  • In order to achieve the above-mentioned objects, yet another embodiment of the present invention provides an array method of a feeding network for a flat-type waveguide antenna by preparing waveguides, symmetric and asymmetric T-type power dividers, and cells that includes: arraying the cell in an area of the flat-type waveguide antenna at a regular intervals, determining positions of the T-type power dividers and waveguides connected to the arrayed cells, and verifying a designed power dividing pattern; a first array of when the power dividing pattern is designed to divide the maximum power to the center, arraying the asymmetric T-type power divider to divide small power toward the outside from the center of the flat-type waveguide antenna; and an analysis of connecting paths through which signals of array-completed cells and waveguides and T-type power dividers are transmitted with each other to analyze and design the radiation pattern of the flat-type waveguide antenna and when the radiation pattern is not analyzed, proceeding to the verification.
  • Preferably, the array method further includes when the power dividing pattern is verified to divide predetermined power to an intermediate part between the center and the outside part, a second array of arraying the symmetric T-type power divider to divide the predetermined power to the designed intermediate part and proceeding to the analysis.
  • Further, when the power dividing pattern is verified to divide the predetermined power to the outside part, arraying the asymmetric T-type power divider to divide the predetermined power to the designed outside part and proceeding to the analysis.
  • In addition, the asymmetric T-type power divider is at least one selected between a symmetric T-type power divider and the asymmetric T-type power divider and a T-type power divider is arrayed to divide large power to cells connected toward the outside of the flat-type waveguide antenna.
  • Besides, the dividing of the small power toward the outside arrays the asymmetric T-type power divider to averagely divide smaller power toward the outside from the center.
  • [Advantageous Effects]
  • The present invention has an industrial applicability of reducing noise caused by a side-lobe because the level of the side-lobe is designed to be low by optionally arraying asymmetric and symmetric T-type power dividers.
  • Further, the present invention has a usability of easily controlling power divided by adjusting the width of an inlet of each branch line in the T-type power divider.
  • In addition, the present invention has an industrial applicability of efficiently transferring divided and inputted signal power without a loss by matching phases and impedances of the corresponding signal power by using a step transformer that optionally arrays the divided and inputted signal power.
  • Besides, the present invention has a usability of improving an environment of a wireless signal by preventing an influence of wireless interference to adjacent base stations, and preventing wiretapping or jamming because a radiation pattern of a flat-type waveguide antenna is optionally adjusted through designing.
  • [Description of Drawings]
    • FIG. 1 is a perspective view showing an overall configuration of a feeding network for a flat-type waveguide antenna including a rectangular T-type power divider as an example of the present invention.
    • FIG. 2 is a detailed perspective view of a lower panel configuring a flat-type waveguide antenna as an example of the present invention.
    • FIG. 3 is a detailed structural diagram of a T-type power divider of a lower panel of a flat-type waveguide antenna according to an exemplary embodiment of the present invention.
    • FIG. 4 is a plan view of a T-type power divider configuring a feeding network for a flat-type waveguide antenna according to another embodiment of the present invention.
    • FIG. 5 is a plan view of a T-type power divider configuring a feeding network for a flat-type waveguide antenna according to yet another embodiment of the present invention.
    • FIG. 6 is a plan view of a T-type power divider configuring a feeding network for a flat-type waveguide antenna according to still another embodiment of the present invention.
    • FIG. 7 is a perspective view showing an overall configuration of a rectangular flat-type waveguide antenna as another example of the present invention.
    • FIG. 8 is a detailed plan view by a lower panel in FIG. 7.
    • FIG. 9 is a detailed structural diagram of a T-type power divider of an asymmetric structure which is applicable to an embodiment of the present invention.
    • FIG. 10 is a detailed structural diagram of T-type power dividers of symmetric and asymmetric structures which are applicable to an exemplary embodiment of the present invention.
    • FIG. 11 is a detailed explanatory diagram of a structure of a T-type power divider of an asymmetric structure as another example of the present invention.
    • FIG. 12 is a flowchart of an array method by a structure of a feeding network for a flat-type waveguide antenna as an example of the present invention.
    [Best Mode]
  • Prior to this, terms or words used in the specification and the appended claims should not be construed as normal and dictionaric meanings and should be construed as meanings and concepts which conform with the spirit of the present invention according to a principle that the inventor can properly define the concepts of the terms in order to describe his/her own invention in the best way.
  • A flat-type waveguide antenna is an antenna to have directionality by arraying a plurality of antennas on the same plane. In this case, each of the antennas constituting the flat-type waveguide antenna is referred to as a cell. The antenna has a pattern in which signal power is radiated. A main-lobe is a radiation pattern having the largest signal power which is radiated and a side-lobe represents all radiation patterns other than the main-lobe. A waveguide has a shape similar to a metallic pipe and transmits a signal through a path of which upper and lower and right and left sides are hermetically sealed with a minimum transmission loss. A T-type power divider symmetrically or asymmetrically divides and transmits signal power inputted into one line through branch lines and collects the signal powers applied to the branch lines and transmits the collected signal power through one line. In the description of the present invention, the T-type power divider will be described on the basis of power dividing for ease of a description.
  • FIG. 1 is a perspective view showing an overall configuration of a feeding network for a flat-type waveguide antenna including a rectangular T-type power divider as an example of the present invention, FIG. 2 is a detailed perspective view of a lower panel configuring a flat-type waveguide antenna as an example of the present invention, and FIG. 3 is a detailed structural diagram of a T-type power divider of a lower panel of a flat-type waveguide antenna according to an exemplary embodiment of the present invention.
  • Hereinafter, referring to FIGS. 1 to 3, the present invention will be described in detail. The flat-type waveguide antenna 100 includes a lower panel 110 and an upper panel 120, and a horn panel 130.
  • The lower panel 110 of FIG. 1 includes a waveguide 111 receiving and transmitting a signal of predetermined power to be radiated from an antenna, a T-type power divider 112 dividing the power of the signal applied from the waveguide 111 at a designed ratio, and cells 113 resonating the signals applied through the T-type power divider 112 and the waveguide 111, and radiating through wireless transmission or wirelessly receiving the resonated signals.
  • The T-type power divider 112 inputs the signal power applied through the waveguide 111 through a first line and symmetrically or asymmetrically divides the power by a ratio in an inlet width between a second line and a third line. Further, the signal powers applied to the second line and the third line are merged with each other and transmitted to the first line. Hereinafter, power dividing for transmission will primarily be described for easy of a description. The second line and the third line optionally includes at least one of an upper reflector or a lower reflector that changes the signals applied through power dividing and optionally includes at least one of step transformers that change phases of the signals and match impedances of the signals. As an example, when the inlet widths of the second line and the third line are the same as each other, the T-type power divider 112 becomes the symmetric T-type power divider 112 and when the inlet widths of the second line and the third line are different from each other, the T-type power divider 112 becomes an asymmetric T-type power divider 112.
  • The cells 113 resonate with the applied signal and when the cells 113 resonate with the signal applied through the waveguide and wirelessly radiate it, the cells serve as a transmitting (TX) antenna and when the cells 113 resonate with the wirelessly applied signal and transmit it to the waveguide, the cells 113 serve as a receiving (RX) antenna.
  • The plurality of waveguides 111, the plurality of T-type power dividers 112, and the plurality of cells 113 constitute a feeding network 114. The feeding network 114 includes a plurality of lower waveguides 111, a plurality of lower T-type power dividers 112, and a plurality of lower cells 113 as many as necessary by designing.
  • The structure of the feeding network 114 including the cells 113 of the lower panel 110 in the lower part of the upper panel 120 is similar as the structure of the lower panel of the lower panel. A duplicate description will be omitted. The upper panel 120 includes cell feeding units 121 at positions corresponding to the cell 113.
  • The horn panel 130 includes horn antennas 131 at positions corresponding to the cell feeding units 121 of the upper panel 120.
  • Each of the lower panel 110, the upper panel 120, and the horn panel 130 is conductive. In the accompanying drawings, each panel has a rectangular shape for ease of a description, but the shape of each panel is not limited to the rectangular shape and each panel may have various shapes including a polygonal shape, a circular shape, a geometric shape, and the like in addition to a triangular shape. Further, one of each of the lower panel 110 and the upper panel 120 is configured, but the plurality of lower panels 110 and upper panels 120 may be duplicated with each other. As such, the upper panel 110 and the lower panel 120 may be modified in various forms.
  • Referring to FIG. 2, the lower panel will be described in detail below. The lower panel 110 includes the waveguides 111, the T-type power dividers 112, the cells 113, and the like. A configuration corresponding to the bottom of the upper panel 120 shown in FIG. 1 is formed in the lower panel 110.
  • Referring to FIG. 3, the exemplary embodiment of the present invention will be described below. The plurality of T-type power dividers 112 are connected to the waveguide 111 provided in the lower panel 110. Each of the T-type power dividers 112 supplies large power to the cell 113 positioned at the center of the flat-type waveguide antenna. Widths of inlets of branch lines dividing the signal power are different from each other so as to supply smaller power toward the vicinity or outside of a predetermined direction. In this case, the level of an electromagnetic wave radiated to the main-lobe of the flat-type waveguide antenna is high and the level of an electromagnetic wave radiated to a side-lobe is low.
  • That is, as an example, signal power applied to a first line which is an input line of the T-type power divider 112 is divided into a second line 112a and a third line 112b which are two branch lines, in which the second and third lines 112a and 112b are asymmetric to each other to have different inlet widths. The larger power is divided to a branch line having the larger inlet width and the smaller power is divided to a branch line having the smaller inlet width. In general, the signal power is allocated and divided in accordance with the ratio of the inlet width and when the inlet widths are the same as each other, the signal power having the same magnitude is symmetrically divided.
  • By repetitively using the asymmetric T-type power divider 112, the cell positioned at the center of the flat-type waveguide antenna to the cell positioned at the outside of the flat-type waveguide antenna are connected with each other in sequence in an array sequence. In this case, two branch lines 112a and 112b of each T-type power divider 112 are configured to divide the larger signal power to a cell 113 positioned relatively closer to the center on the basis of the T-type power divider 112. The smaller signal power is configured to be divided to a cell 113 positioned relatively farther from the center.
  • That is, the second line 112a that is relatively closer to the center is configured and arrayed to have a width larger than the third line 112b opposite to the second line 112a. The cell 113 is provided at the end of each branch line of the T-type power divider 112.
  • The bottom of the upper panel 120 includes the same corresponding configuration as the feeding network 114 including the waveguides 111, the T-type power dividers 112, the cells 113, and the like. In particular, the cell feeding units 121 at positions corresponding to the lower cells 113 are penetrated to be opened through the top. The horn panel 130 is combined onto the top of the upper panel 120 and the horn antennas 131 are formed on the top of positions corresponding to the cell feeding units 121.
  • When signal power having predetermined magnitude is applied to the waveguide 111 configuring the feeding network 114 of the flat-type waveguide antenna 100, large power and small power corresponding inlet widths of branch lines are divided by the first T-type power divider 112. Large signal power is supplied to the cell 113 positioned closer to the center and small signal power is supplied to the second T-type power divider 112 having the same asymmetric specification again. The second asymmetric T-type power divider 112 divides the inputted signal power into large power and small power depending on the inlet widths of the branch lines again to supply large power to a cell 113 positioned second from the center and supply small power to the third T-type power divider 112 having the same asymmetric specification again.
  • By this configuration, since the asymmetric T-type power dividers 112 are repetitively arrayed and connected to the cells 113, large signal power is applied to the cell 113 positioned at the center through the asymmetric T-type power divider 112 and the magnitude of the signal power supplied to the cells 113 gradually decreases toward the outside.
  • The cell 113 resonates with the applied signal. The resonating signal is radiated through the cell feeding unit 121 and the horn antenna 131. The magnitude of the radiated signal corresponds to the level of the signal power applied to the cell 113. Therefore, the cell 113 positioned at the center radiates large signal power and the cells 113 positioned at the outside radiate small signal power toward the outside. Accordingly, since the level of the signal radiated from the cell at the center of the flat-type waveguide antenna is large and the radiation level is small toward the outside, the level of the side-lobe is reduced.
  • Further, when the wireless signal is received through the flat-type waveguide antenna 100, the wireless signal is inputted into the horn antenna 131 to be transferred to the cell 113 through the cell feeding unit 121 and resonates with the lower cell 113 to be transmitted through the waveguide 111 configuring the feeding network 114. In this process, a signal received toward the center is transmitted with large power while passing through each T-type power divider 112.
  • Graphs 1 to 3 shown below show general radiation characteristics for each frequency when the signal having the same magnitude is divided to each of the cells 113 configuring the feeding network for the flat-type waveguide antenna 100. Further, Graphs 4 to 6 show a radiation characteristic of a flat-type waveguide antenna having a structure in which larger power is divided toward the center as an example of the present invention.
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  • As shown in the graphs, the level of the side-lobe is lowered in the case of the radiation characteristic by the structure of the feeding network for the flat-type waveguide antenna including the T-type power dividing according to the exemplary embodiment of the present invention in comparison with the radiation characteristic of the flat-type waveguide antenna in the prior art. Therefore, in the case of the flat-type waveguide antenna 100 according to the exemplary embodiment of the present invention, since the magnitude of electromagnetic waves radiated in the direction of the side-lobe other than the direction of the main-lobe is reduced, transmission and reception characteristics are improved as well as problems such as wireless interference, noise, and the like do not occur in adjacent base stations, an artificial satellite, and the like. As an example, when the flat-type waveguide antenna 100 is applied to a region where satellites are densely arrayed and base stations are positioned adjacent to each other, such as Europe, it is possible to acquire a larger effect.
  • The symmetric and asymmetric T-type power dividers may optionally be applied to the flat-type waveguide antenna.
  • FIG. 4 is a plan view of a T-type power divider configuring a feeding network for a flat-type waveguide antenna according to another embodiment of the present invention.
  • Hereinafter, referring to FIG. 4, another embodiment of the present invention will be described in detail below. In FIG. 4, structures of a second line 203a and a third line 203b which are two branch lines of the asymmetric T-type power divider 203 that is directly connected with cells 204 are shown and a first line is included at a predetermined angle. An inlet width of the second line 203a provided relatively closer to the center of the flat-type waveguide antenna 200 between two branch lines 203a and 203b of the T-type power divider 203 connected with the cell 204 is larger than the inlet width of the third line 230b opposite to the inlet width of the second line 203a. The T-type power divider 202 has the same structure as the T-type power divider 112 of FIG. 3.
  • The flat-type waveguide antenna 200 according to another embodiment of the present invention performs the same functions as the flat-type waveguide antenna 100 according to the exemplary embodiment of the present invention of FIG. 3. However, the flat-type waveguide antenna 200 is different from the flat-type waveguide antenna 100 in that the first line receiving the signal is included at a predetermined angle.
  • That is, the flat-type waveguide antenna 200 is applied to be suitable for a case in which array positions of the lower cells 204 needs to be adjusted depending on the dimension or size of the flat-type waveguide antenna.
  • FIG. 5 is a plan perspective view of a T-type power divider configuring a feeding network for a flat-type waveguide antenna according to yet another embodiment of the present invention.
  • Hereinafter, referring to FIG. 5, yet another embodiment of the present invention will be described in detail below. In the T-type power divider 302 of the flat-type waveguide antenna 300, between a second line 302a and a third line 302b which are two branch lines of opposite directions, a conductor 303 is combined to the third line 302b positioned relatively farther from the center of the waveguide antenna 300 and line widths or dimensions of two branch lines 302a and 302b are asymmetric to each other by the conductor 300.
  • The second line 112a and the third line 112b of the T-type power divider 112 according to the exemplary embodiment of FIG. 3 have the inlet widths asymmetric to each other, but in yet another embodiment, cross-sectional areas of the second line 302a and the third line 302b are decreased. That is, the conductor 303 is disposed in the branch line 302b positioned relatively farther from the center to decrease the width or cross-sectional area of the branch line 302b. Undescribed reference numeral 304 represents the cell of the flat-type waveguide antenna 300.
  • The flat-type waveguide antenna 300 employing the T-type power divider 302 according to yet another embodiment of the present invention having such a configuration reduces the radiation level of the side-lobe in accordance with the same principle and operation as the flat-type waveguide antennas employing the T-type power dividers 112 and 203 according to the exemplary embodiment and another embodiment.
  • FIG. 6 is a plan view of a T-type power divider configuring a feeding network for a flat-type waveguide antenna according to still another embodiment of the present invention.
  • Hereinafter, referring to FIG. 6 still another embodiment of the present invention will be described in detail below. In the T-type power divider 402 of the flat-type waveguide antenna 400, between a second line 402a and a third line 402b which are two branch lines of opposite directions, a projection portion 403 for dividing low power by decreasing an inlet width of the branch line 402b that is positioned relatively farther from the center is formed. Undescribed reference numeral 404 represents the cell.
  • The flat-type waveguide antenna 400 employing the T-type power divider 402 according to still another embodiment of the present invention having such a configuration reduces the radiation level of the side-lobe in accordance with the same principle and operation as other flat-type waveguide antennas according to the embodiments.
  • FIG. 7 is a perspective view showing an overall configuration of a rectangular flat-type waveguide antenna as another example of the present invention and FIG. 8 is a detailed plan view by a lower panel in FIG. 7.
  • Hereinafter, referring to FIG. 7, the flat-type waveguide antenna will be described in detail. The flat-type waveguide antenna 500 as another example includes a conductive lower panel 510 and a conductive upper panel 520, and a conductive slot panel 530.
  • A waveguide 511 is formed on the top of the lower panel 510 and a waveguide (not shown) having a shape corresponding to the waveguide 511 by the lower panel 510 is formed on the bottom of the upper panel 520. Herein, the upper panel 510 and the lower panel 520 have a square shape.
  • When the structure of the feeding network formed by the upper panel 520 and the lower panel 510 is described, the waveguide 511 of the lower panel 510 and the waveguide (not shown) of the upper panel 520 face each other. Therefore, the feeding network of the lower panel 510 will be described as an example.
  • Hereinafter, referring to FIG. 8, the feeding network of the lower panel 510 will be described in detail. In the T-type power divider 512 connected to the waveguide 511 of the lower panel 510, an inlet width of a branch branched toward the center is larger than that of a branch line branched toward the outside. A second line 512a and a third line 512b which are two branch lines of the T-type power divider 512 are asymmetric to each other to have different line widths. That is, between two branch lines 512a and 512b, the second line 512a that is positioned relatively closer to the center has a larger inlet width than the third line 512b opposite to the second line 512a on the basis of the directions of both ends to reduce the radiation level of the side-lobe. A cell 513 is formed at the end of each branch line.
  • A feeding network having a shape corresponding to the feeding network of the lower panel 510 is formed on the bottom of the upper panel 520 and a cell feeding unit 521 is penetrated to be opened through the top of the upper panel 520. The slot panel 530 is combined to the top of the upper panel 520. The slot panel 530 is a conductive panel and includes a plurality of slots 531.
  • The flat-type waveguide antenna 500 having such a configuration reduces the radiation level of the side-lobe in accordance with the same principle and operation as the flat-type waveguide antennas employing the T-type power dividers 112, 203, 302, and 402 according to the embodiments. Therefore, a detailed description there of will be omitted.
  • FIG. 9 is a detailed structural diagram of a T-type power divider of an asymmetric structure which is applicable to an embodiment of the present invention.
  • Hereinafter, referring to FIGS. 9 and 3, the structure of the asymmetric T-type power divider according to the present invention will be described in detail. The T-type power dividers 112, 203, 302, 402, and 512 (hereinafter, referred to as '600') asymmetrically divide the power of the signal transmitted and applied by the waveguides 111, 201, 301, 401, and 511 (hereinafter, referred to as '111') by a ratio set in accordance with the inlet widths of the branch lines.
  • The T-type power divider 600 includes a first line 610 receiving power of a communication signal applied from the waveguide 111 at a predetermined level, a second line 620 receiving power of a communication signal divided at a ratio of inlet widths by the corresponding ratio from the first line 610, and transmitting the received power by changing the transmission direction into a predetermined progressing direction, and a third line 630 receiving power of a communication signal divided at a ratio of inlet widths by the corresponding ratio from the first line 610 and transmitting the received power by changing the transmission direction into a predetermined progressing direction. Since the second line 620 has a larger inlet width than the third line 630, the second line 620 receives signal power of a large level. That is, the third line 630 receives a communication signal of lower power than the second line 620 and transmits the received communication signal in a predetermined direction.
  • The second line 620 optionally further includes a first upper reflector 621. The first upper reflector 621 receives and reflects the power of the communication signal inputted into the first line 610 by a width a at a predetermined ratio to allow the communication signal to move fast in a predetermined direction. That is, since the inputted signal is progressed to the second line 620 by changing its progressing direction while being repetitively reflected on a wall of the first line 610 and a wall of the second line 620 in the case in which the first upper reflector 621 is not provided, problems such as a delay, and the like may occur, but since the first reflector 621 propagates the inputted signal to the second line 620 by changing the direction by reflecting the signal applied from the first line 610 at once, the direction of the communication is rapidly and accurately changed. Hereinafter, the functions and operations of the reflector are the same as those described above.
  • The third line 630 includes at least one selected from a second lower reflector 631, a second upper reflector 632, and step transformers 633, 634, 635, and 636. That is, the third line includes all of them and although not shown, the second line may optionally include them.
  • The second lower reflector 631 propagates signal power of a predetermined level inputted into the first line 610 and received at a predetermined ratio by rapidly changing and propagating the signal power in a predetermined direction and the second upper reflector 632 propagates the communication signal reflected and applied from the second lower reflector 631 by rapidly changing the propagation direction of the communication signal into a predetermined direction again. Further, as necessary, optionally, any one may be provided, all may be provided, or nothing may be provided.
  • In the case of the structure having the step transformers 633, 634, 635, and 636, a cross-sectional area of the third line 630 of each step transformer is decreased to have d or e. Therefore, by changing both a phase and an impedance of the applied communication signal, the phase and impedance match with each other and only any one or all may optionally be provided. As an example, when only the step transformer 633 is provided, the cross-sectional area of the third line 630 is decreased to a predetermined size, and the phase and impedance of the communication signal applied to the third line 630 are changed into a predetermined range by the decreased cross-sectional area. Since the cross-sectional area is further decreased within a predetermined range even in the case in which the step transformer 634 is further provided, the phase and impedance are further changed. Since the cross-sectional area is further decreased similarly even in the case in which the step transformer 635 is further provided, the phase and impedance are further changed. Since the cross-sectional area is further decreased even in the case in which the step transformer 636 is further provided, the phase and impedance are further changed.
  • Therefore, the third line 630 to which signal power corresponding to a width c optionally includes at least one selected from the step transformers 633, 634, 635, and 636 by values of the phase and impedance to be changed when the phase and impedance of the communication signal are attempted to be changed to the matching state.
  • The magnitudes of power of the second line 620 and the third line 630 into which the signal power applied to the first line 610 having the inlet width a is divided are different depending on the cross-sectional area of each of the second line 620 and the third line 630, but when the magnitudes are described on the basis of the inlet width, the signal power applied with the inlet width a of the first line 610 is determined by a ratio between the inlet width b of the second line 620 and the inlet width c of the third line 630. That is, the signal power applied to the first line 610 is divided corresponding to the sizes of the width b and width c.
  • The signals divided by the third line 620 and the third line 630 are designed to have a phase difference of 180° from each other in the case of an E-plane.
  • In this case, inlet widths c, d, e, and f by the third line 630 are designed such that c is smaller than d, d is smaller than e, and e is smaller than f. The width f is equal to the width b.
  • FIG. 10 is a detailed structural diagram of T-type power dividers of symmetric and asymmetric structures which are applicable to an exemplary embodiment of the present invention.
  • Hereinafter, referring to FIGS. 10 and 3, the symmetric and asymmetric T-type power dividers according to the present invention will be described in detail. The T-type power divider 700 symmetrically divides the power of the signal transmitted and applied from the waveguide 111 at the same ratio and at this time, phases of the divided signals are designed to be different from each other by 180° in the case of the E-plane.
  • The T-type power divider 700 includes a first line 710 receiving signal power applied from the waveguide 111 at a predetermined level, a second line 720 receiving signal power divided at a predetermined ratio from the first line 710 and transmitting the received signal power by changing the transmission direction into a predetermined progressing direction, and a third line 730 receiving signal power divided at a predetermined ratio from the first line 710 and transmitting the received signal power by changing the transmission direction into a predetermined progressing direction. The second line 720 and the third line 730 receive signal powers divided by the inlet width b and the inlet width e, respectively.
  • The second line 720 includes at least one selected from a first lower reflector 721, a first upper reflector 722, and step transformers 723 and 724 or does not include any one of them. Further, the third line 730 includes at least one selected from a second lower reflector 731, a second upper reflector 732, and step transformers 733 and 734 or does not include any one of them.
  • The second line 720 and the third line 730 have the same structure as each other except for a difference between the inlet width b and the inlet width e. Therefore, a description of the third line 730 will be omitted and only the structure of the second line 720 will be described.
  • The first lower reflector 721 configuring the second line 720 reflects the signal power that is inputted into the first line 710 and divided by the ratio between the inlet widths b and e to rapidly transmit the signal power in a predetermined direction. As an example, the signal divided and inputted from the first line 710 is repetitively reflected on the corresponding wall to be transmitted in the direction of the second line 720 in the case in which the first lower reflector 721 is not provided, but a reflection direction is constantly fixed by the first lower reflector 721. Therefore, the progressing direction is rapidly determined. Since the functions and operations of the first upper reflector 722 are the same as those of the first upper reflector described above, a duplicate description thereof will be omitted. In this case, when the inlet widths b and e are equal to each other, the T-type power divider 700 is a symmetric type and when the inlet widths b and e are not equal to each other, the T-type power divider 700 is an asymmetric type.
  • The step transformers 723 and 724 change a phase and an impedance of the signal power applied to the second line 720 by a predetermined value.
  • The first line 710 may apply the inputted communication signal to the second and third lines 720 and 730 without changing the phase and impedance. The first line 710 applies a communication signal having a phase and an impedance that are changed as necessary. A first input step transformer 711 and a second input step transformer 712 are optionally used to change the phase of the inputted communication signal. That is, the phase and impedance of the inputted communication signal need to be changed, at least one selected between the first input step transformer 711 and the second input step transformer 712 is provided and when the phase and impedance do not need to be changed, any one is not provided.
  • The T-type power divider 700 divides the signal power into signal power having the same magnitude when the inlet width b of the second line 720 is equal to the inlet width e of the third line 730, and divides the signal power into signal powers by the corresponding ratio and applies the signal powers when the inlet widths b and e are not equal to each other.
  • The width c is a value acquired by subtracting the width of the step transformer 723 from the width d when only the step transformer 723 is provided, the width c is a value acquired by subtracting the width of the step transformer 724 from the width d when only the step transformer 724 is provided, the width c is equal to the width d when any one is not provided, and the width c has a value of c shown in the figure when both are provided. Since the width c is similar even in the case of the third line 730, a duplicate description will not be omitted.
  • Therefore, when the T-type power divider 700 transmits a signal of the E-plane, the phases of the communication signal divided by the second line 720 and the third line 730 are different from each other by 180° and when the T-type power divider 700 transmits a signal of an H-plane, there is no difference between the phases.
  • FIG. 11 is a detailed explanatory diagram of a structure of a T-type power divider of an asymmetric structure as another example of the present invention.
  • Hereafter, referring to FIG. 11, the T-type power divider of the asymmetric structure will be described in detail. The T-type power divider 800 divides asymmetrically divides the power of the signal transmitted and applied from the waveguide 111 at a predetermined ratio and when the divided signals are the E-plane, the phases of the divided signals are different from each other by 180°.
  • The T-type power divider 800 includes a first line 810 receiving signal power applied from the waveguide 111 at a predetermined level, a second line 820 receiving power of a communication signal divided at a predetermined ratio from the first line 810 and transmitting the received signal power by changing the transmission direction into a predetermined progressing direction, and a third line 830 receiving signal power divided at a predetermined ratio from the first line 810 and transmitting the received signal power by changing the transmission direction into a predetermined progressing direction.
  • The second line 820 receives larger signal power than the third line 830 and the third line 830 receives smaller signal power than the second line 820 to transmit the received signal powers in a predetermined direction.
  • The first line 810 includes a triangular reflector 840 at an end portion thereof which contacts with the second line 820 and the third line 830. The third line 830 includes a protrusion 831 having a predetermined width from the reflector 840 of the first line and a triangular step transformer 832 having a predetermined width from the protrusion 831.
  • The reflector 840 divides the communication signal applied from the first line 810 into two and applies two divided communication signals to the second line 820 and the third line 830, respectively. Magnitudes of the powers divided to the second line 820 and the third line 830 are divided as corresponding values computed by a ratio between the inlet width b of the second line 820 and the inlet width c of the third line 830.
  • The step transformer 832 of the third line 830 is used to match the phase and impedance of the inputted communication signal with each other. When the phase and impedance do not need to be changed, the step transformer is not optionally provided and when the phase and impedance need to be changed, the step transformer 832 may further be provided. The width c is smaller than the width d and the width d is smaller than the width e. That is, the widths have a relationship of e > d > c.
  • FIG. 12 is a flowchart of an array method by a structure of a feeding network for a flat-type waveguide antenna as an example of the present invention.
  • Hereinafter, referring to FIG. 12, the array method will be described in detail. Waveguides, symmetric and asymmetric T-type power dividers, and cells as many as necessary are prepared in order to configure the feeding network for the flat-type waveguide antenna (S110).
  • A plurality of cells are arrayed in an area having a predetermined size designed as the flat-type waveguide antenna at a regular interval and array positions of the T-type power dividers and the waveguides are determined to correspond to the positions of the cells (S120). Thereafter, a power dividing pattern designed for the flat-type waveguide antenna is verified (S130).
  • As an example, the power dividing pattern is verified and when the power dividing pattern is verified as a pattern in which the maximum power concentrates on the center (S130), an asymmetric T-type power divider is arrayed to divide the maximum power to the center and divide small power that is averagely decreased toward the outside farther from the center. That is, branch lines to which large power of the asymmetric T-type power divider is divided are positioned and arrayed in a direction in which large power is divided. In the present invention, the asymmetric T-type power divider is arrayed to divide large power to the center of the flat-type waveguide antenna (S140) . In general, in the flat-type waveguide antenna, radiation patterns at the left and right sides of the center are designed to be symmetric to each other. That is, it is general not to separate upper and lower radiation patterns from each other.
  • As such, paths through which signals of array-completed cells and waveguides and asymmetric T-type power dividers are transmitted are connected with each other (S170) to calculate and analyze the radiation pattern. When the radiation pattern is verified to have the same shape as the power dividing pattern in the analysis, the process proceeds to the termination and when the radiation pattern is verified to be not the same, the process proceeds to the verification process (S130) to repeat a series of processes described above (S180).
  • In this case, as another example, according to the verification result of the designed radiation pattern (S130), when a power dividing pattern is verified to be designed to divide predetermined power to an intermediate part between the center and the outside, at least one of the asymmetric T-type power divider and the symmetric T-type power divider is selected to divide the predetermined power to the designed intermediate part (S150). As such, paths through which signals of array-completed cells and waveguides and asymmetric T-type power dividers are transmitted are connected with each other (S170) to analyze the radiation pattern (S180).
  • As yet another example, according to the verification result of the designed power dividing pattern (S130), when the power dividing pattern is verified as a pattern in which power having a predetermined magnitude is divided to the outside part, at least one of the asymmetric T-type power divider and the symmetric T-type power divider is selected to divide the power having the predetermined magnitude to the designed outside to divide the predetermined power to the outside part (S160). As such, paths through which signals of array-completed cells and waveguides and asymmetric T-type power dividers are transmitted are connected with each other (S170) to analyze the radiation pattern (S180).
  • The present invention having such a configuration has an advantage to divide power to the center of the flat-type waveguide antenna or divide the predetermined power to the intermediate part or the outside part.
  • Although the present invention described in detail with reference to the detailed example, it can be understood by those skilled in the art that various changes and modifications can be made within the scope and technical idea of the present invention. Thus, it is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

Claims (25)

  1. A structure of a feeding network for a flat-type waveguide antenna, comprising:
    a waveguide receiving and transmitting signal having predetermined power to be radiated by the flat-type waveguide antenna;
    a T-type power divider including a first line receiving power of the signal applied from the waveguide, a second line receiving power of a signal asymmetrically divided by a ratio between an inlet width of the second line itself and an inlet width of a third line asymmetrically forming the power of the signal applied from the first line, and transmitting the received signal power by changing the transmission direction, and a third line receiving power of a signal asymmetrically divided by a ratio between the inlet width of the third line itself and the inlet width of the second line asymmetrically forming the power of the signal applied from the first line, wherein the inlet width of the second line is larger than that of the third line, and the second line and the third line transmit the asymmetrically divided signals by adjusting phases and impedances of the corresponding signals; and
    a cell resonating and radiating the power signals divided and received from the T-type power divider.
  2. The structure of claim 1, wherein the second line further includes a first upper reflector changing a transmission direction of the signal divided and received from the first line.
  3. The structure of claim of claim 1, wherein the third line further includes a second lower reflector changing the transmission direction of the signal divided and received from the first line.
  4. The structure of claim 3, wherein the third line further includes a second upper reflector changing a transmission direction of the signal received from the second lower reflector.
  5. The structure of claim 4, wherein the third line further includes a step transformer matching a phase and an impedance of the signal received from the second upper reflector with each other.
  6. The structure of claim 5, wherein the step transformer is provided on at least one of an upper part and a lower part of the third line.
  7. The structure of claim 6, wherein at least one step transformer is optionally provided in the third line.
  8. A structure of a feeding network for a flat-type waveguide antenna, comprising:
    a waveguide receiving and transmitting signal having predetermined power to be radiated by the flat-type waveguide antenna;
    a T-type power divider including a first line receiving power of the signal applied from the waveguide, a second line receiving the power of the signal applied from the first line as power of a signal divided by a ratio between an inlet width of the second line itself and an inlet width of a third line, and transmitting the received signal power by changing the transmission direction, and a third line receiving the power of the signal applied from the first line as power of a signal divided by a ratio between the inlet width of the third line itself and the inlet width of the second line, wherein the second line and the third line transmit the asymmetrically divided signals by adjusting phases and impedances of the corresponding signals; and
    a cell resonating and radiating the power signals divided and received from the T-type power divider.
  9. The structure of claim 8, wherein the second line further includes:
    a first lower reflector changing a transmission direction of the signal received from the first line; and
    a first upper reflector changing a transmission direction of the signal received from the first lower reflector.
  10. The structure of claim 9, wherein the second line further includes a step transformer matching a phase and an impedance of the signal received from the first upper reflector with each other.
  11. The structure of claim 10, wherein the step transformer is provided on at least one of an upper part and a lower part of the second line.
  12. The structure of claim 11, wherein at least one step transformer is optionally provided in the second line and matches the phase and impedance of the received signal with each other.
  13. The structure of claim 8, wherein the third line further includes:
    a second lower reflector changing a transmission direction of the signal received from the first line; and
    a second upper reflector changing a transmission direction of the signal received from the second lower reflector.
  14. The structure of claim 13, wherein the third line further includes a step transformer matching a phase and an impedance of the signal received from the second upper reflector with each other.
  15. The structure of claim 14, wherein at least one step transformer is optionally provided on at least one of an upper part and a lower part of the third line and matches the phase and impedance of the received signal with each other.
  16. The structure of claim 8, wherein the first line optionally further includes at least one input step transformer matching a phase and an impedance of the signal received from the waveguide with each other.
  17. The structure of claim 8, wherein an inlet width of the second line and an inlet width of the third line are formed in at least one selected from a symmetric structure or an asymmetric structure.
  18. The structure of any one of claims 1 and 8, wherein the first line transmits the power of the inputted signal at least one selected between straightly and obliquely.
  19. The structure of any one of claims 1 and 8, wherein the third line reduces the width of the inlet by combining a conductor to the inlet.
  20. The structure of any one of claims 1 and 8, wherein the third line reduces the width of the inlet by forming a protrusion at the inlet.
  21. An array method of a feeding network for a flat-type waveguide antenna by preparing waveguides, symmetric and asymmetric T-type power dividers, and cells, comprising:
    arraying the cell in an area of the flat-type waveguide antenna at a regular intervals, determining positions of the T-type power dividers and waveguides connected to the arrayed cells, and verifying a designed power dividing pattern;
    a first array of when the power dividing pattern is designed to divide the maximum power to the center, arraying the asymmetric T-type power divider to divide small power toward the outside from the center of the flat-type waveguide antenna; and
    an analysis of connecting paths through which signals of array-completed cells and waveguides and T-type power dividers are transmitted with each other to analyze and design the radiation pattern of the flat-type waveguide antenna and when the radiation pattern is not analyzed, proceeding to the verification.
  22. The array method of claim 21, further comprising, when the power dividing pattern is verified to divide predetermined power to an intermediate part between the center and the outside part, a second array of arraying the symmetric T-type power divider to divide the predetermined power to the designed intermediate part and proceeding to the analysis.
  23. The array method of claim 21, wherein when the power dividing pattern is verified to divide the predetermined power to the outside part, arraying the asymmetric T-type power divider to divide the predetermined power to the designed outside part and proceeding to the analysis.
  24. The array method of claim 23, wherein the asymmetric T-type power divider is at least one selected between a symmetric T-type power divider and the asymmetric T-type power divider and a T-type power divider is arrayed to divide large power to cells connected toward the outside of the flat-type waveguide antenna.
  25. The array method of claim 21, wherein the dividing of the small power toward the outside arrays the asymmetric T-type power divider to averagely divide smaller power toward the outside from the center.
EP09704021.6A 2008-01-25 2009-01-23 Feed network structure and arrangement method of planar waveguide antenna Withdrawn EP2237371A4 (en)

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WO2009093779A1 (en) 2009-07-30
KR101035093B1 (en) 2011-05-19

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