WO2009061015A1 - Slotted waveguide antenna for reception of circular polarized waves - Google Patents

Slotted waveguide antenna for reception of circular polarized waves Download PDF

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Publication number
WO2009061015A1
WO2009061015A1 PCT/KR2007/005618 KR2007005618W WO2009061015A1 WO 2009061015 A1 WO2009061015 A1 WO 2009061015A1 KR 2007005618 W KR2007005618 W KR 2007005618W WO 2009061015 A1 WO2009061015 A1 WO 2009061015A1
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WO
WIPO (PCT)
Prior art keywords
conductive plate
polarized waves
polarizer
plate
circularly polarized
Prior art date
Application number
PCT/KR2007/005618
Other languages
French (fr)
Inventor
Chan Goo Park
Original Assignee
Wiworld Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wiworld Co., Ltd. filed Critical Wiworld Co., Ltd.
Priority to CN2007801014599A priority Critical patent/CN101919118A/en
Priority to JP2010532981A priority patent/JP2011503996A/en
Publication of WO2009061015A1 publication Critical patent/WO2009061015A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/0006—Particular feeding systems
    • H01Q21/0037—Particular feeding systems linear waveguide fed arrays
    • H01Q21/0043—Slotted waveguides
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/20—Non-resonant leaky-waveguide or transmission-line antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/22—Longitudinal slot in boundary wall of waveguide or transmission line
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/24—Polarising devices; Polarisation filters 
    • H01Q15/242—Polarisation converters
    • H01Q15/244—Polarisation converters converting a linear polarised wave into a circular polarised wave
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/0006—Particular feeding systems
    • H01Q21/0037—Particular feeding systems linear waveguide fed arrays
    • H01Q21/0068—Dielectric waveguide fed arrays
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
    • H01Q21/061—Two dimensional planar arrays
    • H01Q21/064—Two dimensional planar arrays using horn or slot aerials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
    • H01Q21/245—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction provided with means for varying the polarisation 

Definitions

  • the present invention relates to a slotted waveguide antenna for reception of circularly polarized waves, and more particularly to a slotted waveguide antenna for receiving circularly polarized waves capable of improving impedance matching, an axial ratio and an axial ratio bandwidth by a ⁇ tionally forming a dielectric plate between a conductive plate having waveguides and a polarizer of an uppermost layer.
  • a feeding line to which satellite signals are transmitted is formed as a waveguide to minimize feeding loss generated in a process of transmitting signals in a conventional microstrip patch array antenna.
  • the slotted waveguide antenna is formed by stacking a lower conductive plate having a feeding line and a waveguide, an intermediate conductive plate and an upper conductive plate.
  • the slotted waveguide antenna having such a multilayer structure has low resistance loss and low radiation loss by transmitting satellite signals through the waveguide.
  • the antenna formed of the lower conductive plate, the intermediate conductive plate and the upper conductive plate is generally a slotted waveguide antenna for receiving linearly polarized waves, the antenna has low reception efficiency when it receives circularly polarized waves instead of linearly polarized waves.
  • a polarizer with strip conductors for converting linearly polarized waves into circularly polarized waves is disposed on the upper conductive plate to receive circularly polarized waves. Even when the polarizer is disposed on the upper conductive plate, there still exists a problem of low reception efficiency due to poor impedance matching, axial ratio and axial ratio bandwidth.
  • Patent No. 686606 entitled “lotted Waveguide Satellite Antenna for Receiving Circularly Polarized Waves", wherein strip conductors and matching stubs are formed on a polarizer for converting linearly polarized waves into circularly polarized waves to improve the axial ratio and axial ratio bandwidth of circularly polarized waves, and grooves are formed at upper ends of slots of the upper conductive plate to improve impedance matching of the antenna and the axial ratio and axial ratio bandwidth of circularly polarized waves, thereby receiving circularly polarized waves at high efficiency.
  • the present invention has been made in view of the above problems, and it is an object of the present invention to provide a slotted waveguide antenna for receiving circularly polarized waves capable of improving impedance matching, an axial ratio and an axial ratio bandwidth by additionally coupling a dielectric plate having a specified dielectric constant and thickness between an upper conductive plate and a polarizer of the slotted waveguide antenna for receiving circularly polarized waves, thereby receiving satellite signals of circularly polarized waves at high efficiency.
  • a slotted waveguide antenna for reception of circularly polarized waves, which includes a lower conductive plate and an intermediate conductive plate which are coupled to each other to have a feeding line and a waveguide to which satellite frequency signals are transmitted and an upper conductive plate which is coupled to an upper portion of the intermediate conductive plate and has a plurality of cavities and slots to communicate with the waveguide so as to transmit and receive satellite frequency signals
  • the slotted waveguide antenna comprising: a polarizer with strip conductors for converting linearly polarized waves into circularly polarized waves and matching stubs which are formed at an upper portion of the upper conductive plate; and a dielectric plate which is disposed between the upper conductive plate and the polarizer to perform impedance matching with space impedance.
  • the dielectric plate is coupled to the polarizer and the upper conductive plate respectively disposed above and below the dielectric plate through double-sided tapes.
  • through holes are formed on the double-sided tapes at positions corresponding to the slots formed on the upper conductive plate disposed below the double- sided tape.
  • Hg. 1 illustrates a combined perspective view of a slotted waveguide antenna for receiving circularly polarized waves according to the present invention
  • Hg. 2 illustrates an exploded perspective view of the slotted waveguide antenna for receiving circularly polarized waves according to the present invention
  • Hg. 3 illustrates a combined cross-sectional view of the slotted waveguide antenna for receiving circularly polarized waves according to the present invention.
  • Hg. 1 illustrates a combined perspective view of a slotted waveguide antenna for receiving circularly polarized waves according to the embodiment of the present invention.
  • Hg. 2 illustrates an exploded perspective view of the slotted waveguide antenna for receiving circularly polarized waves.
  • Hg. 3 illustrates a combined cross- sectional view of the slotted waveguide antenna for receiving circularly polarized waves.
  • the slotted waveguide antenna for receiving circularly polarized waves includes a lower conductive plate 400, an intermediate conductive plate 300, an upper conductive plate 200, a dielectric plate 500 and a polarizer 100, which are sequentially stacked.
  • Fastening holes 401, 301 and 201 are respectively formed at corresponding positions of the lower conductive plate 400, the intermediate conductive plate 300 and the upper conductive plate 200 such that the lower conductive plate 400, the intermediate conductive plate 300 and the upper conductive plate 200 are coupled to each other by a fastening means such as a screw.
  • Waveguides 420 and 320 for transmitting satellite signals and distributors 421, 422 and 423 for distributing signals are formed on the lower conductive plate 400 and the intermediate conductive plate 300.
  • the lower conductive plate 400 includes a radiation pipe 430 and a bulge
  • a feeding line 410 is formed at the end of the waveguide 420 to output the satellite signals to the outside.
  • radiation grooves 310 are formed on the intermediate conductive plate 300 at the end of the waveguide 320 distributed through the distributors to communicate with an upper outer side.
  • the upper conductive plate 200 has a plurality of slots 210 passing through the upper conductor plate 200, grooves 230 which are formed around upper portions of the slots 210 and have an upper portion removed to a specified depth, and an upper surface 240 which defines boundaries between the grooves 230. Further, cavities 220 are formed at a lower portion of the upper conductive plate 200 such that the lower side of the cavities 220 is open and the upper side of the cavities 220 communicates with the slots 210. The cavities 220 are formed with a size to communicate with four neighboring slots 210.
  • the slots 210 serve to receive the satellite signals.
  • the grooves 230 and the upper surface 240 serve to minimize interference between the satellite signals received respectively to the slots 210.
  • the cavities 220 serve to expand an impedance bandwidth of the antenna and transmit the satellite signals received through the respective slots 210 to the radiation grooves 310 of the intermediate conductor plate 300.
  • the grooves 230 are formed in a cylindrical shape having a diameter equal or similar to a length of the slots 210 to rotate linearly polarized waves by a certain angle.
  • the upper surface 240 which defines the boundaries between the plural grooves 230 serves to prevent the satellite signals applied to the respective slots 210 from leaking to cause interference.
  • the polarizer 100 is configured in the form of a film.
  • the polarizer 100 includes strip conductors 110 and matching stubs 120 which are formed on an upper portion of the upper conductive plate 200, wherein the strip conductors 110 convert linearly polarized waves into circularly polarized waves and the matching stubs 120 are formed to be protruded at opposite sides of the strip conductors 110 to change an impedance.
  • the strip conductors 110 serve to convert linearly polarized waves into circularly polarized waves by radiation interference with the slots 210.
  • the strip conductors 110 are formed at about 45 degrees with the slots 210 such that frequency signals are properly radiated from the slots 210 while influencing the strip conductors 110.
  • the matching stubs 120 serve to improve an axial ratio and an axial ratio bandwidth of circularly polarized waves converted through the strip conductors 110.
  • the matching stubs 120 serving as inductance or capacitance elements, are coupled to the strip conductors 110 to change the impedance of the antenna. Accordingly, the matching stubs 120 serve to improve the axial ratio bandwidth by shifting a resonance frequency of the antenna or expanding the bandwidth. Further, the matching stubs 120 change a phase of the frequency signals converted into the circularly polarized waves by the strip conductors 110 to produce the circularly polarized waves having an improved axial ratio.
  • the dielectric plate 500 is a plate having a specified dielectric constant and thickness.
  • the dielectric plate 500 is disposed between the polarizer 100 and the upper conductive plate 200.
  • the dielectric plate 500 is formed to have low insertion loss and a low dielectric constant, thereby preventing surface waves and increasing the frequency bandwidth.
  • the dielectric plate 500 is formed to have a dielectric constant similar to a dielectric constant of air to serve as an air layer inserted between the polarizer 100 and the upper conductive plate 200. In this embodiment, the dielectric plate 500 is formed to have a dielectric constant of 1 ⁇ 2.
  • the dielectric plate 500 serves to support the polarizer 100 and the upper conductive plate 200 such that the polarizer 100 and the upper conductive plate 200 are maintained to be spaced by a thickness of the dielectric plate 500 at a dielectric constant of the dielectric plate 500.
  • the upper conductive plate 200 is very close to the polarizer 100, when signals induced to the upper conductive plate 200 are excited to the strip conductors 110 of the polarizer 100, impedance mismatching is generated, thereby causing a problem such that only a portion of the signals excited to the strip conductors 110 of the polarizer 100 is radiated to a space. Further, as a distance between the upper conductive plate 200 and the polarizer 100 becomes larger, the impedance and the axial ratio bandwidth are increased, whereas the intensity of energy transferred between the strip conductors 110 and the slots 210 becomes smaller. Accordingly, impedance matching becomes difficult.
  • the dielectric plate 500 is formed to have a thickness of about 1 mm with regard to impedance matching of the upper conductive plate 200 and the strip conductors 110 of the polarizer 100.
  • the dielectric plate 500 properly adjusts the distance between the upper conductive plate 200 and the strip conductors 110 of the polarizer 100 and provides a specified dielectric constant between the upper conductive plate 200 and the polarizer 100 to reduce a relative dielectric constant of a radiation portion of the antenna. Accordingly, it facilitates impedance matching with the space impedance, and it is possible to improve the gain of the antenna by reducing the antenna loss according to the impedance mismatching generated in receiving satellite signals and shifting a communication frequency band. Also, it is possible to solve problems such as deterioration of axial ratio characteristics and reduction of the axial ratio bandwidth which are generated when the axial ratio frequency is shifted by changing the used band.
  • An upper portion of the dielectric plate 500 is coupled to the polarizer 100 disposed above the dielectric plate 500 through a double-sided tape 510. Also, a lower portion of the dielectric plate 500 is coupled to the upper conductive plate 200 disposed below the dielectric plate 500 through a double-sided tape 510.
  • Through holes 511 are formed on the double-sided tape 510 at positions corresponding to the slots 210 and the grooves 230 formed on the upper conductive plate 200 disposed below the double- sided tape 510.
  • the through holes 511 serve to reduce the slight loss which may be generated according to variation of the relative dielectric constant due to a dielectric constant of the double-sided tape 510 disposed between the upper conductive plate 200 and the polarizer 100.
  • the double-sided tape 510 is formed of a thin and transparent material.
  • the dielectric plate 500 is inserted between the polarizer 100 and the upper conductive plate 200, thereby facilitating impedance matching with the space impedance, improving the gain of the antenna, and improving the axial ratio and the axial ratio bandwidth of circularly polarized waves.
  • a dielectric plate having a specified dielectric constant and thickness is formed between an upper conductive plate with slots and a polarizer for converting linearly polarized waves into circularly polarized waves to facilitate impedance matching with the space impedance.

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  • Waveguide Aerials (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Aerials With Secondary Devices (AREA)

Abstract

A slotted waveguide antenna for receiving circularly polarized waves capable of improving impedance matching, an axial ratio and an axial ratio bandwidth by additionally forming a dielectric plate between a conductive plate having waveguides and a polarizer of an uppermost layer is disclosed. The slotted waveguide antenna for reception of circularly polarized waves, which includes a lower conductive plate and an intermediate conductive plate which are coupled to each other to have a feeding line and a waveguide to which satellite frequency signals are transmitted and an upper conductive plate which is coupled to an upper portion of the intermediate conductive plate and has a plurality of cavities and slots to communicate with the waveguide so as to transmit and receive satellite frequency signals, includes a polarizer (100) with strip conductors (110) for converting linearly polarized waves into circularly polarized waves and matching stubs (120) which are formed at an upper portion of the upper conductive plate (200), and a dielectric plate (500) which is disposed between the upper conductive plate (200) and the polarizer (100) to perform impedance matching with space impedance.

Description

Description
SLOTTED WAVEGUIDE ANTENNA FOR RECEPTION OF CIRCULAR POLARIZED WAVES
Technical Field
[1] The present invention relates to a slotted waveguide antenna for reception of circularly polarized waves, and more particularly to a slotted waveguide antenna for receiving circularly polarized waves capable of improving impedance matching, an axial ratio and an axial ratio bandwidth by aάϊtionally forming a dielectric plate between a conductive plate having waveguides and a polarizer of an uppermost layer.
[2]
Background Art
[3] In a slotted waveguide antenna among satellite antennas, a feeding line to which satellite signals are transmitted is formed as a waveguide to minimize feeding loss generated in a process of transmitting signals in a conventional microstrip patch array antenna.
[4] Generally, the slotted waveguide antenna is formed by stacking a lower conductive plate having a feeding line and a waveguide, an intermediate conductive plate and an upper conductive plate. The slotted waveguide antenna having such a multilayer structure has low resistance loss and low radiation loss by transmitting satellite signals through the waveguide.
[5] Since the antenna formed of the lower conductive plate, the intermediate conductive plate and the upper conductive plate is generally a slotted waveguide antenna for receiving linearly polarized waves, the antenna has low reception efficiency when it receives circularly polarized waves instead of linearly polarized waves.
[6] Thus, a polarizer with strip conductors for converting linearly polarized waves into circularly polarized waves is disposed on the upper conductive plate to receive circularly polarized waves. Even when the polarizer is disposed on the upper conductive plate, there still exists a problem of low reception efficiency due to poor impedance matching, axial ratio and axial ratio bandwidth.
[7] To solve the problem, an applicant of the present invention has proposed Korean
Patent No. 686606, entitled "lotted Waveguide Satellite Antenna for Receiving Circularly Polarized Waves", wherein strip conductors and matching stubs are formed on a polarizer for converting linearly polarized waves into circularly polarized waves to improve the axial ratio and axial ratio bandwidth of circularly polarized waves, and grooves are formed at upper ends of slots of the upper conductive plate to improve impedance matching of the antenna and the axial ratio and axial ratio bandwidth of circularly polarized waves, thereby receiving circularly polarized waves at high efficiency.
[8] In the above-mentioned Patent, however, since the polarizer is stacked directly on the upper end of the upper conductive plate, impedance mismatching is occasionally generated in shifting satellite signals and the communication frequency band, thereby reducing the gain of the antenna, deteriorating axial ratio characteristics in shifting the axial ratio frequency, or decreasing the axial ratio bandwidth.
[9]
Disclosure of Invention Technical Problem
[10] Therefore, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a slotted waveguide antenna for receiving circularly polarized waves capable of improving impedance matching, an axial ratio and an axial ratio bandwidth by additionally coupling a dielectric plate having a specified dielectric constant and thickness between an upper conductive plate and a polarizer of the slotted waveguide antenna for receiving circularly polarized waves, thereby receiving satellite signals of circularly polarized waves at high efficiency.
[H]
Technical Solution
[12] In accordance with an aspect of the present invention, the above and other objects can be accomplished by the provision of a slotted waveguide antenna for reception of circularly polarized waves, which includes a lower conductive plate and an intermediate conductive plate which are coupled to each other to have a feeding line and a waveguide to which satellite frequency signals are transmitted and an upper conductive plate which is coupled to an upper portion of the intermediate conductive plate and has a plurality of cavities and slots to communicate with the waveguide so as to transmit and receive satellite frequency signals, the slotted waveguide antenna comprising: a polarizer with strip conductors for converting linearly polarized waves into circularly polarized waves and matching stubs which are formed at an upper portion of the upper conductive plate; and a dielectric plate which is disposed between the upper conductive plate and the polarizer to perform impedance matching with space impedance.
[13] Preferably, the dielectric plate is coupled to the polarizer and the upper conductive plate respectively disposed above and below the dielectric plate through double-sided tapes. Preferably, through holes are formed on the double-sided tapes at positions corresponding to the slots formed on the upper conductive plate disposed below the double- sided tape.
[14]
Brief Description of the Drawings
[15] The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
[16] Hg. 1 illustrates a combined perspective view of a slotted waveguide antenna for receiving circularly polarized waves according to the present invention;
[17] Hg. 2 illustrates an exploded perspective view of the slotted waveguide antenna for receiving circularly polarized waves according to the present invention; and
[18] Hg. 3 illustrates a combined cross-sectional view of the slotted waveguide antenna for receiving circularly polarized waves according to the present invention.
[19]
Best Mode for Carrying Out the Invention
[20] Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings.
[21] Hg. 1 illustrates a combined perspective view of a slotted waveguide antenna for receiving circularly polarized waves according to the embodiment of the present invention. Hg. 2 illustrates an exploded perspective view of the slotted waveguide antenna for receiving circularly polarized waves. Hg. 3 illustrates a combined cross- sectional view of the slotted waveguide antenna for receiving circularly polarized waves.
[22] As shown in Hgs. 1 to 3, the slotted waveguide antenna for receiving circularly polarized waves according to the present invention includes a lower conductive plate 400, an intermediate conductive plate 300, an upper conductive plate 200, a dielectric plate 500 and a polarizer 100, which are sequentially stacked. Fastening holes 401, 301 and 201 are respectively formed at corresponding positions of the lower conductive plate 400, the intermediate conductive plate 300 and the upper conductive plate 200 such that the lower conductive plate 400, the intermediate conductive plate 300 and the upper conductive plate 200 are coupled to each other by a fastening means such as a screw.
[23] Waveguides 420 and 320 for transmitting satellite signals and distributors 421, 422 and 423 for distributing signals are formed on the lower conductive plate 400 and the intermediate conductive plate 300.
[24] Meanwhile, the lower conductive plate 400 includes a radiation pipe 430 and a bulge
440 which receive satellite signals and change the direction of the received satellite signals to transmit the satellite signals to the waveguide 420. A feeding line 410 is formed at the end of the waveguide 420 to output the satellite signals to the outside. Further, radiation grooves 310 are formed on the intermediate conductive plate 300 at the end of the waveguide 320 distributed through the distributors to communicate with an upper outer side.
[25] The upper conductive plate 200 has a plurality of slots 210 passing through the upper conductor plate 200, grooves 230 which are formed around upper portions of the slots 210 and have an upper portion removed to a specified depth, and an upper surface 240 which defines boundaries between the grooves 230. Further, cavities 220 are formed at a lower portion of the upper conductive plate 200 such that the lower side of the cavities 220 is open and the upper side of the cavities 220 communicates with the slots 210. The cavities 220 are formed with a size to communicate with four neighboring slots 210.
[26] The slots 210 serve to receive the satellite signals. The grooves 230 and the upper surface 240 serve to minimize interference between the satellite signals received respectively to the slots 210. The cavities 220 serve to expand an impedance bandwidth of the antenna and transmit the satellite signals received through the respective slots 210 to the radiation grooves 310 of the intermediate conductor plate 300. The grooves 230 are formed in a cylindrical shape having a diameter equal or similar to a length of the slots 210 to rotate linearly polarized waves by a certain angle. The upper surface 240 which defines the boundaries between the plural grooves 230 serves to prevent the satellite signals applied to the respective slots 210 from leaking to cause interference.
[27] The polarizer 100 is configured in the form of a film. The polarizer 100 includes strip conductors 110 and matching stubs 120 which are formed on an upper portion of the upper conductive plate 200, wherein the strip conductors 110 convert linearly polarized waves into circularly polarized waves and the matching stubs 120 are formed to be protruded at opposite sides of the strip conductors 110 to change an impedance. The strip conductors 110 serve to convert linearly polarized waves into circularly polarized waves by radiation interference with the slots 210. The strip conductors 110 are formed at about 45 degrees with the slots 210 such that frequency signals are properly radiated from the slots 210 while influencing the strip conductors 110. The matching stubs 120 serve to improve an axial ratio and an axial ratio bandwidth of circularly polarized waves converted through the strip conductors 110. The matching stubs 120, serving as inductance or capacitance elements, are coupled to the strip conductors 110 to change the impedance of the antenna. Accordingly, the matching stubs 120 serve to improve the axial ratio bandwidth by shifting a resonance frequency of the antenna or expanding the bandwidth. Further, the matching stubs 120 change a phase of the frequency signals converted into the circularly polarized waves by the strip conductors 110 to produce the circularly polarized waves having an improved axial ratio.
[28] The dielectric plate 500 is a plate having a specified dielectric constant and thickness. The dielectric plate 500 is disposed between the polarizer 100 and the upper conductive plate 200. The dielectric plate 500 is formed to have low insertion loss and a low dielectric constant, thereby preventing surface waves and increasing the frequency bandwidth. The dielectric plate 500 is formed to have a dielectric constant similar to a dielectric constant of air to serve as an air layer inserted between the polarizer 100 and the upper conductive plate 200. In this embodiment, the dielectric plate 500 is formed to have a dielectric constant of 1 ~ 2.
[29] The dielectric plate 500 serves to support the polarizer 100 and the upper conductive plate 200 such that the polarizer 100 and the upper conductive plate 200 are maintained to be spaced by a thickness of the dielectric plate 500 at a dielectric constant of the dielectric plate 500.
[30] If the upper conductive plate 200 is very close to the polarizer 100, when signals induced to the upper conductive plate 200 are excited to the strip conductors 110 of the polarizer 100, impedance mismatching is generated, thereby causing a problem such that only a portion of the signals excited to the strip conductors 110 of the polarizer 100 is radiated to a space. Further, as a distance between the upper conductive plate 200 and the polarizer 100 becomes larger, the impedance and the axial ratio bandwidth are increased, whereas the intensity of energy transferred between the strip conductors 110 and the slots 210 becomes smaller. Accordingly, impedance matching becomes difficult.
[31] Thus, the distance between the upper conductive plate 200 and the strip conductors
110 of the polarizer 100 should be properly adjusted. The distance between the upper conductive plate 200 and the strip conductors 110 of the polarizer 100 is adjusted by the thickness of the dielectric plate 500. In this embodiment of the present invention, the dielectric plate 500 is formed to have a thickness of about 1 mm with regard to impedance matching of the upper conductive plate 200 and the strip conductors 110 of the polarizer 100.
[32] The dielectric plate 500 properly adjusts the distance between the upper conductive plate 200 and the strip conductors 110 of the polarizer 100 and provides a specified dielectric constant between the upper conductive plate 200 and the polarizer 100 to reduce a relative dielectric constant of a radiation portion of the antenna. Accordingly, it facilitates impedance matching with the space impedance, and it is possible to improve the gain of the antenna by reducing the antenna loss according to the impedance mismatching generated in receiving satellite signals and shifting a communication frequency band. Also, it is possible to solve problems such as deterioration of axial ratio characteristics and reduction of the axial ratio bandwidth which are generated when the axial ratio frequency is shifted by changing the used band.
[33] An upper portion of the dielectric plate 500 is coupled to the polarizer 100 disposed above the dielectric plate 500 through a double-sided tape 510. Also, a lower portion of the dielectric plate 500 is coupled to the upper conductive plate 200 disposed below the dielectric plate 500 through a double-sided tape 510. Through holes 511 are formed on the double-sided tape 510 at positions corresponding to the slots 210 and the grooves 230 formed on the upper conductive plate 200 disposed below the double- sided tape 510. The through holes 511 serve to reduce the slight loss which may be generated according to variation of the relative dielectric constant due to a dielectric constant of the double-sided tape 510 disposed between the upper conductive plate 200 and the polarizer 100. Preferably, the double-sided tape 510 is formed of a thin and transparent material.
[34] As described above, in the slotted waveguide antenna for receiving circularly polarized waves according to the present invention, the dielectric plate 500 is inserted between the polarizer 100 and the upper conductive plate 200, thereby facilitating impedance matching with the space impedance, improving the gain of the antenna, and improving the axial ratio and the axial ratio bandwidth of circularly polarized waves.
[35] Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, acϋtions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. [36]
Industrial Applicability
[37] In the slotted waveguide antenna for receiving circularly polarized waves according to the present invention, a dielectric plate having a specified dielectric constant and thickness is formed between an upper conductive plate with slots and a polarizer for converting linearly polarized waves into circularly polarized waves to facilitate impedance matching with the space impedance. Thus, it is possible to improve the gain of the antenna and enhance the axial ratio and axial ratio bandwidth of circularly polarized waves by reducing the antenna loss according to the impedance mismatching generated in shifting the use frequency.

Claims

Claims
[1] A slotted waveguide antenna for reception of circularly polarized waves, which includes a lower conductive plate and an intermediate conductive plate which are coupled to each other to have a feeding line and a waveguide to which satellite frequency signals are transmitted and an upper conductive plate which is coupled to an upper portion of the intermediate conductive plate and has a plurality of cavities and slots to communicate with the waveguide so as to transmit and receive satellite frequency signals, the slotted waveguide antenna comprising: a polarizer (100) with strip conductors (110) for converting linearly polarized waves into circularly polarized waves and matching stubs (120) which are formed at an upper portion of the upper conductive plate (200); and a dielectric plate (500) which is disposed between the upper conductive plate (200) and the polarizer (100) to perform impedance matching with space impedance.
[2] The slotted waveguide antenna according to claim 1, wherein the dielectric plate
(500) is coupled to the polarizer (100) and the upper conductive plate (200) respectively disposed above and below the dielectric plate (500) through double- sided tapes (510).
[3] The slotted waveguide antenna according to claim 2, wherein through holes
(511) are formed on the double-sided tapes (510) at positions corresponding to the slots (210) formed on the upper conductive plate (200) disposed below the double-sided tape (510).
[4] The slotted waveguide antenna according to claim 1, wherein the dielectric plate
(500) is formed to have a dielectric constant of 1 ~ 2.
PCT/KR2007/005618 2007-11-07 2007-11-08 Slotted waveguide antenna for reception of circular polarized waves WO2009061015A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN2007801014599A CN101919118A (en) 2007-11-07 2007-11-08 Slotted waveguide antenna for reception of circular polarized waves
JP2010532981A JP2011503996A (en) 2007-11-07 2007-11-08 Improved circularly polarized wave receiving waveguide slot array antenna

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2007-0112969 2007-11-07
KR1020070112969A KR20090047015A (en) 2007-11-07 2007-11-07 Improved waveguide slot array antenna for receiving circularly polarized wave

Publications (1)

Publication Number Publication Date
WO2009061015A1 true WO2009061015A1 (en) 2009-05-14

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JP (1) JP2011503996A (en)
KR (1) KR20090047015A (en)
CN (1) CN101919118A (en)
WO (1) WO2009061015A1 (en)

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