JP2008283381A - Antenna device - Google Patents

Antenna device Download PDF

Info

Publication number
JP2008283381A
JP2008283381A JP2007124736A JP2007124736A JP2008283381A JP 2008283381 A JP2008283381 A JP 2008283381A JP 2007124736 A JP2007124736 A JP 2007124736A JP 2007124736 A JP2007124736 A JP 2007124736A JP 2008283381 A JP2008283381 A JP 2008283381A
Authority
JP
Japan
Prior art keywords
antenna
ebg
microstrip antenna
msa
metal
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
JP2007124736A
Other languages
Japanese (ja)
Inventor
Keizo Cho
Yoshitoshi Fujimoto
Toshikazu Hori
Makoto Yamaguchi
俊和 堀
山口  良
美俊 藤元
敬三 長
Original Assignee
Ntt Docomo Inc
Univ Of Fukui
国立大学法人福井大学
株式会社エヌ・ティ・ティ・ドコモ
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 Ntt Docomo Inc, Univ Of Fukui, 国立大学法人福井大学, 株式会社エヌ・ティ・ティ・ドコモ filed Critical Ntt Docomo Inc
Priority to JP2007124736A priority Critical patent/JP2008283381A/en
Publication of JP2008283381A publication Critical patent/JP2008283381A/en
Pending legal-status Critical Current

Links

Images

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antenna device which applies an electromagnetic band gap (EBG) structure and can improve radiation characteristics of a microstrip antenna (MSA). <P>SOLUTION: The antenna system is provided with a plurality of metal patch arrays which are arranged in parallel along both sides of the microstrip antenna 102. The resonance frequency of each metal patch 104 is higher than that of the microstrip antenna 102 and at least two arrays of metal patches 104 are arranged on both the sides of one direction of the microstrip antenna 102. A distance (d) from a feeding point P of the microstrip antenna 102 up to one side (b) is shorter than a distance from the center of the microstrip antenna 102 up to the side (b). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an antenna device, and more particularly to an antenna device using a microstrip antenna and an EBG structure.

  Antenna technology is one of the key technologies that support wireless communication technologies including mobile communication. Among antenna technologies, planar antennas including microstrip antennas (MSA) have recently attracted particular attention. The main reason is that it has various advantages such as being suitable for mass production because it is constituted by photo-etching technology, having a planar structure and being compact, and being excellent in design and mountability.

  An MSA is a very thin antenna with a square or circular metal element on a ground plane. Although this antenna has directivity on the metal element side, a sharp main beam cannot be obtained by itself due to unnecessary radiation.

  As a technique for suppressing unnecessary radiation of MSA, a method in which a parasitic patch is arranged close to each other is known (for example, see Patent Document 1). Furthermore, an EBG (electromagnetic band-gap) structure composed of metal patches periodically arranged at narrow intervals has been actively studied in recent years for application to microwave components and antennas.

  The EBG structure has a feature of frequency band suppression, and can suppress unnecessary radiation of radio waves. In MSA on a finite ground plane, edge diffraction affects the radiation pattern as ripple and back radiation. For this reason, it is thought that unnecessary radiation can be suppressed when an EBG structure is applied to a substrate on which an MSA is mounted.

JP-A-9-246852

  Although the EBG structure has an effect of suppressing unnecessary radiation, there has been a problem in that the gain in the radiation direction cannot be improved in the structure conventionally considered.

  As a method for improving the gain of MSA, a method (array antenna) in which a plurality of antenna elements are arranged and power is supplied to each of them is widely used. However, the array antenna needs to supply power to each antenna, and in the case of a multi-element array antenna, the feeder circuit becomes complicated and causes a loss.

  This problem is caused by the fact that a construction method for improving main radiation characteristics in the conventional EBG structure has not been clarified.

  The present invention has been made in view of such problems, and an object thereof is to provide an antenna device capable of improving the radiation characteristics of an MSA to which an EBG structure is applied.

  In order to achieve such an object, in the present invention, in the antenna in which the EBG structure is arranged on both sides of the MSA, the EBG column is arranged at a distance that maximizes the directivity gain.

  According to an embodiment of the present invention, an antenna device according to the present invention includes an array of metal patches arranged in parallel across a microstrip antenna, the plurality of metal patches being The resonance frequency is higher than that of the microstrip antenna, and at least two rows are arranged on both sides of the microstrip antenna, and the distances between the centers of adjacent metal patches included in the row of the metal patches are all equal.

  With such a configuration, gain can be improved and directivity can be sharpened.

  Here, the distance between the central axes of the metal patch rows arranged on one side of the microstrip antenna may be equal to the distance between the centers of adjacent metal patches included in the metal patch row. .

  Further, the metal patch rows may be arranged perpendicular to the direction of the electric field generated by the microstrip antenna.

  The microstrip antenna may be a rectangle, and the rows of the metal patches may be arranged in parallel with the short sides of the rectangle.

  Here, the distance from the center of the microstrip antenna to the axis passing through the center of the row of the metal patches closest to the microstrip antenna is 0.4 to 0.8 times the resonance wavelength of the microstrip antenna. Preferably there is.

  The number of metal patches included in the metal patch row is preferably 3 or more.

  According to the present invention, in an MSA to which an EBG structure that suppresses unnecessary radiation is applied, there is an effect that a feeding loss is eliminated and a gain in a desired radiation direction is improved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1 and 2 show the configuration of the antenna device according to the present embodiment. As shown in these drawings, the antenna device includes a rectangular MSA 102 and a plurality of rectangular metal patches 104 arranged on the substantially same plane as the MSA and in parallel with one side of the MSA. These two types of metal elements can be made of copper or brass.

  The horizontal length a and the vertical length b of the MSA 102 have a relationship of a> b. In addition, the metal patch 104 has a higher resonance frequency than the MSA 102.

  A ground metal surface 108 having a larger area than the MSA 102 and the metal patch 104 is provided on the rear surface of the antenna device. The ground metal surface 108 can be made of copper or brass as well as the metal element. The plurality of metal patches 104 constitute a mushroom type EBG structure connected to the ground metal surface 108 with a distance h, and the period (distance between the centers of the metal patches) T is two rows on each side of the MSA 102 in one direction. It is arranged.

  Hereinafter, a structure in which metal patches are periodically arranged is called an EBG structure, and each row of metal patches included in the EBG structure is called an EBG row. In this case, the metal patch is also called an EBG element.

  In the example shown in FIG. 1, the EBG rows 106 are arranged on the left and right sides of the MSA 102 in parallel with the Y axis. Hereinafter, such an arrangement is referred to as “Y-arrangement”. Here, each EBG row 106 is composed of six EBG elements 104.

  In the example shown in FIG. 2, the EBG rows 106 are arranged above and below the MSA 102 in parallel with the X axis. Hereinafter, such an arrangement is referred to as an “X-arrangement”. Here, each EBG row 106 is composed of six EBG elements 104.

  With reference to FIG. 3, how to count the EBG sequence will be described. In the EBG column, a pair of columns arranged symmetrically from the center of the MSA with the MSA interposed therebetween is counted as one column. Therefore, when two EBGs 304 are arranged on both sides of the MSA 302, the EBG column 306 becomes two columns.

  When the EBGs 304 are arranged vertically, they are all arranged with a period T. When the number of EBG columns 306 is two or more, the EBG structures are also arranged in the horizontal direction, but the arrangement period at this time is also T as in the vertical direction. That is, the distance between the central axes of the metal patch rows 306 disposed on one side of the MSA 302 is equal to T between the centers of adjacent metal patches 304 included in the metal patch row 306.

  Referring again to FIGS. 1 and 2, the distance d between the EBG structure and the square MSA is defined as the distance between the axis through the center of the nearest EBG column and the center of the MSA. The distance d is preferably 0.4 to 0.8 times the resonance wavelength of the MSA as will be described later.

  Further, in the example shown in FIG. 1, the feeding point is located at a position P at a distance c from the middle point of the side b and is a distance c from the side b, and power is supplied via the feeding line L. The When the feeding point is arranged in this way, a current flows in the MSA 102 in the horizontal direction of the drawing, and the direction of the electric field (E direction) is generated in the horizontal direction of the drawing. The EBG array is not arranged parallel to the direction of the electric field generated by the microstrip antenna (H-plane arrangement) but arranged perpendicular to the direction of the electric field (E-plane arrangement).

  When the antenna device according to the present embodiment is actually manufactured, the MSA and the metal patch can be formed by cutting a copper or brass metal plate. In this case, the connection between the metal patch and the short-circuit pin, and the connection between the finite ground plane and the short-circuit pin can be performed by soldering. Further, it is possible to make a hole in the finite ground plane, pass the power supply line, and connect the MSA to one end of the power supply line by soldering.

  Various embodiments other than those described above are possible.

  For example, in the above embodiment, nothing is provided between the ground metal surface and the MSA and EBG structures, but the MSA is formed on a dielectric substrate such as a Teflon (PTFE) substrate or a BT resin substrate. Etc. may be provided. In this case, a metal element such as an MSA or EBG structure can be formed on the dielectric substrate by etching.

  Moreover, although the mushroom type EBG structure was mentioned as an example in the above-mentioned embodiment, even if it employ | adopts the EBG structure which is not earth | grounded, there can exist the effect of this invention.

  Further, in the above-described embodiment, the feeding point is located at a position P at a distance c from the side b on the perpendicular extending from one midpoint of the side b, but the feeding point is further shifted in the vertical direction, It may be located near either one of the sides a. In this case, since the direction of the electric field also occurs in the vertical direction of the drawing, it is more effective not only to arrange the EBG columns on the left and right sides of the MSA as shown in FIG. 1, but also to arrange two EBG columns on the upper and lower sides respectively. Get higher.

  The present invention can be effective when the MSA is square, circular, or elliptical. However, the effect is high when the EBG rows are arranged in the E-plane.

  Various modifications other than those described above are possible. However, as long as it is based on the technical idea described in the claims, the modifications are within the technical scope of the present invention.

  Examples of the present invention will be described below.

  The antenna device shown in FIG. 1 was analyzed using a simulator (PLLAN-MM). The analytical model was designed so that the material is an ideal metal and the MSA operates at a frequency of 2.0 GHz. MSA sizes were a = 66 mm, b = 50 mm, and c = 7.5 mm. The EBG metal patch was short-circuited by a short-circuit pin having a width w of 30 mm and a radius r of 1 mm. The period T of the array was 32 mm. Further, the MSA and the metal patch were arranged at a distance h = 10 mm from an infinite ground plane. These parameters are selected so as to have forbidden band characteristics at the resonance frequency of the MSA.

  FIG. 4 shows an E-plane radiation pattern (xz plane) when the Y-arranged EBG structure is located on the left and right sides of the MSA as shown in FIG. The number of EBG columns is one in the case of FIG. 4A, and is three in the case of FIG. 4B. The radiation pattern of one row of EBG-structured MSAs deteriorated due to the influence of the EBG-structure as shown in FIG. On the other hand, the radiation pattern of the three-row EBG structure MSA was improved as shown in FIG. 4B, and the directivity gain was higher.

  FIG. 5 shows the relationship between the distance d and the directivity gain when the Y-arranged EBG rows are located on the left and right sides of the MSA as shown in FIG. The parameter in FIG. 5 is the number of EBG columns. From FIG. 5, it was found that the directivity gain of the MSA is improved at a distance d = 0.4λ to 0.8λ, and the maximum directivity is obtained when d = 0.55λ to 0.6λ. As the number of EBG columns increases, the maximum directivity gain of the EBG structure MSA is further improved. Here, the directivity gain of the single MSA is 9.2 dBi. Therefore, the maximum directivity gain of the MSA to which the EBG structure is applied is improved by about 2 dB as compared with the MSA alone.

  FIG. 6 shows the relationship between the number of EBG columns and the maximum directivity gain (dBi). In the Y-configuration, the maximum directivity gain increased as the number of EBG columns increased. In addition, the directivity gain of the MSA to which the EBG structure is applied is higher than the directivity gain of the MSA without the EBG structure. The improvement of the directivity gain by the EBG structure according to the present example was 2.1 dB in the case of the EBG structure having four rows of Y-arrangements.

FIG. 7 shows the relationship between the number of EBG sequences and the optimum distance d opt when the directivity gain is maximum, and the vertical axis is a value obtained by dividing the optimum distance d opt by the wavelength λ. From the figure, it was found that the optimum distance d opt depends on the arrangement of the EBG structure. It was also found that the distance d opt was 0.8λ when the number of EBG rows in the X-configuration was 2 to 4. Furthermore, it has been found that the optimum distance d opt for the Y-configuration EBG structure is narrower than that for the X-configuration EBG structure.

  FIG. 8 shows the radiation pattern of the MSA at the maximum directivity gain. 8A shows an E-plane radiation pattern (xz plane) in the Y-configuration EBG structure, and FIG. 8B shows an H-plane radiation pattern (yz plane) in the X-configuration EBG structure. Show. As the number of EBG rows increased, the main beam became sharper, and it was found that the effect was particularly remarkable in MSA to which the Y-configuration EBG structure was applied.

  INDUSTRIAL APPLICABILITY The present invention has a high utility value as an indoor base station antenna or a booster antenna, and can improve the service quality thereof.

It is a figure which shows the structure of the antenna apparatus which concerns on embodiment of this invention. It is a figure which shows the structure of the antenna apparatus which concerns on embodiment of this invention. It is a figure for demonstrating how to count an EBG row | line | column. (A) And (b) is a figure which shows an E-plane radiation pattern (xz surface) when the EBG structure of Y-configuration | positioning concerning the Example of this invention is located in the both sides of MSA. It is a figure which shows the relationship between the distance d when the EBG row | line | column of Y- arrangement | positioning is located in the both sides of MSA in the analytic model of an antenna apparatus, and a directivity gain. It is a figure which shows the relationship between the number of EBG rows | lines and the maximum directivity gain in the analysis model of an antenna apparatus. It is a figure which shows the relationship between the number of EBG row | line | columns when the directivity gain is the maximum, and the optimal distance dopt in the analysis model of an antenna apparatus. (A) is a figure which shows the E-plane radiation pattern (xz plane) of the Y-arrangement EBG structure in the analysis model of an antenna apparatus, (b) is the H-plane of the X-arrangement EBG structure in the analysis model of an antenna apparatus. It is a figure which shows a radiation pattern (yz plane).

Explanation of symbols

102 Microstrip Antenna 104 Metal Patch 106 EBG Row 302 Microstrip Antenna 304 Metal Patch 306 EBG Row

Claims (6)

  1. An antenna device comprising a plurality of rows of metal patches arranged in parallel across a microstrip antenna,
    The plurality of metal patches have a resonance frequency higher than that of the microstrip antenna, and are arranged in at least two rows on both sides of the microstrip antenna, and a distance between centers of adjacent metal patches included in the row of the metal patches is An antenna device characterized in that all are equal.
  2.   The distance between the central axes of metal patch rows arranged on one side of the microstrip antenna is equal to the distance between the centers of adjacent metal patches included in the metal patch row. The antenna device according to 1.
  3.   The antenna device according to claim 1, wherein the metal patch array is disposed perpendicular to a direction of an electric field generated by the microstrip antenna.
  4.   The antenna device according to any one of claims 1 to 3, wherein the microstrip antenna is rectangular, and the rows of the metal patches are arranged in parallel with the short sides of the rectangle.
  5.   The distance from the center of the microstrip antenna to the axis passing through the center of the row of the metal patches closest to the microstrip antenna is 0.4 to 0.8 times the resonance wavelength of the microstrip antenna. The antenna device according to any one of claims 1 to 4, wherein
  6.   6. The antenna device according to claim 1, wherein the number of metal patches included in the metal patch row is three or more.
JP2007124736A 2007-05-09 2007-05-09 Antenna device Pending JP2008283381A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2007124736A JP2008283381A (en) 2007-05-09 2007-05-09 Antenna device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007124736A JP2008283381A (en) 2007-05-09 2007-05-09 Antenna device

Publications (1)

Publication Number Publication Date
JP2008283381A true JP2008283381A (en) 2008-11-20

Family

ID=40143843

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2007124736A Pending JP2008283381A (en) 2007-05-09 2007-05-09 Antenna device

Country Status (1)

Country Link
JP (1) JP2008283381A (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102142604A (en) * 2010-11-30 2011-08-03 南京理工大学 Microstrip antenna element with controllable directional diagram
JP2011166416A (en) * 2010-02-09 2011-08-25 Toyota Central R&D Labs Inc Antenna device
KR101077439B1 (en) * 2009-06-24 2011-10-26 삼성전기주식회사 Printed circuit substrate using the electromanetic bandgap
WO2011136081A1 (en) 2010-04-28 2011-11-03 古河電気工業株式会社 Plane-structured ebg
CN102820513A (en) * 2012-08-22 2012-12-12 北京邮电大学 High-gain dielectric resonator antenna applied to 60 GHz system
JP2013532436A (en) * 2010-06-15 2013-08-15 オフィス オブ ザ ナショナル ブロードキャスティング アンド テレコミュニケーションズ コミッション Ultra-thin microstrip antenna using metamaterial
US8711055B2 (en) 2009-06-24 2014-04-29 Samsung Electro-Mechanics Co., Ltd. Printed circuit board including electromagnetic bandgap structure
CN105514612A (en) * 2016-01-29 2016-04-20 杭州电子科技大学 Low-profile dual-band omni-directional antenna
EP3211718A1 (en) 2016-02-29 2017-08-30 Panasonic Corporation Antenna substrate
US10008783B2 (en) 2013-12-03 2018-06-26 Murata Manufacturing Co., Ltd. Patch antenna
CN110323560A (en) * 2018-03-30 2019-10-11 三星电机株式会社 Antenna assembly, Anneta module and electronic equipment
KR20200009984A (en) * 2018-07-18 2020-01-30 삼성전기주식회사 Antenna apparatus

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101077439B1 (en) * 2009-06-24 2011-10-26 삼성전기주식회사 Printed circuit substrate using the electromanetic bandgap
US8711055B2 (en) 2009-06-24 2014-04-29 Samsung Electro-Mechanics Co., Ltd. Printed circuit board including electromagnetic bandgap structure
JP2011166416A (en) * 2010-02-09 2011-08-25 Toyota Central R&D Labs Inc Antenna device
WO2011136081A1 (en) 2010-04-28 2011-11-03 古河電気工業株式会社 Plane-structured ebg
CN102834974A (en) * 2010-04-28 2012-12-19 古河电气工业株式会社 Plane-structured ebg
JP2013532436A (en) * 2010-06-15 2013-08-15 オフィス オブ ザ ナショナル ブロードキャスティング アンド テレコミュニケーションズ コミッション Ultra-thin microstrip antenna using metamaterial
CN102142604B (en) * 2010-11-30 2013-12-04 南京理工大学 Microstrip antenna element with controllable directional diagram
CN102142604A (en) * 2010-11-30 2011-08-03 南京理工大学 Microstrip antenna element with controllable directional diagram
CN102820513A (en) * 2012-08-22 2012-12-12 北京邮电大学 High-gain dielectric resonator antenna applied to 60 GHz system
US10008783B2 (en) 2013-12-03 2018-06-26 Murata Manufacturing Co., Ltd. Patch antenna
CN105514612A (en) * 2016-01-29 2016-04-20 杭州电子科技大学 Low-profile dual-band omni-directional antenna
EP3211718A1 (en) 2016-02-29 2017-08-30 Panasonic Corporation Antenna substrate
US10256524B2 (en) 2016-02-29 2019-04-09 Panasonic Corporation Antenna substrate
CN110323560A (en) * 2018-03-30 2019-10-11 三星电机株式会社 Antenna assembly, Anneta module and electronic equipment
KR20200009984A (en) * 2018-07-18 2020-01-30 삼성전기주식회사 Antenna apparatus
KR102072649B1 (en) * 2018-07-18 2020-02-03 삼성전기주식회사 Antenna apparatus

Similar Documents

Publication Publication Date Title
EP2826097B1 (en) Phased array antenna
US8890750B2 (en) Symmetrical partially coupled microstrip slot feed patch antenna element
US7498988B2 (en) Antenna element, feed probe; dielectric spacer, antenna and method of communicating with a plurality of devices
US5629713A (en) Horizontally polarized antenna array having extended E-plane beam width and method for accomplishing beam width extension
CN101501934B (en) Antenna array and unit cell using an artificial magnetic layer
Chiu et al. Reduction of mutual coupling between closely-packed antenna elements
KR100952976B1 (en) Antenna element and frequency reconfiguration array antenna using the antenna element
US7423595B2 (en) Dual-polarized microstrip structure
Tomura et al. A 45$^\circ $ Linearly Polarized Hollow-Waveguide Corporate-Feed Slot Array Antenna in the 60-GHz Band
DE60125902T2 (en) Dual band antenna using a single column of elliptical Vivaldi slots
US8736505B2 (en) Phased array antenna
EP1380069B1 (en) Dual-band dual-polarized antenna array
US8633856B2 (en) Compact single feed dual-polarized dual-frequency band microstrip antenna array
JP3958350B2 (en) High frequency device
KR101202339B1 (en) Antenna with metamaterial superstrate simultaneosly providing high-gain and beam-width control
EP1521332B1 (en) A compact multiple-band antenna arrangement
US9379434B2 (en) Transmitting-receiving-separated dual-polarization antenna
US9537208B2 (en) Dual polarization current loop radiator with integrated balun
US9728856B2 (en) Dual-polarized dual-band broad beamwidth directive patch antenna
JP2004120760A (en) Dual polarization antenna
TWI489690B (en) Multi-band planar inverted-f (pifa) antennas and systems with improved isolation
US20100039343A1 (en) Antenna device
CA2699752C (en) Base station antenna with beam shaping structures
US10033110B2 (en) Multi-band, multi-polarized wireless communication antenna
US10003132B2 (en) Shared-aperture antenna and base station

Legal Events

Date Code Title Description
RD03 Notification of appointment of power of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7423

Effective date: 20080829

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A821

Effective date: 20080829

RD04 Notification of resignation of power of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7424

Effective date: 20081009