EP0588465A1 - Diélectrique céramique pour antennes - Google Patents

Diélectrique céramique pour antennes Download PDF

Info

Publication number
EP0588465A1
EP0588465A1 EP93304068A EP93304068A EP0588465A1 EP 0588465 A1 EP0588465 A1 EP 0588465A1 EP 93304068 A EP93304068 A EP 93304068A EP 93304068 A EP93304068 A EP 93304068A EP 0588465 A1 EP0588465 A1 EP 0588465A1
Authority
EP
European Patent Office
Prior art keywords
dielectric material
ceramic dielectric
antenna
ceramic
antennas
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.)
Withdrawn
Application number
EP93304068A
Other languages
German (de)
English (en)
Inventor
Hiroshi Nemoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NGK Insulators Ltd
Original Assignee
NGK Insulators 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 NGK Insulators Ltd filed Critical NGK Insulators Ltd
Publication of EP0588465A1 publication Critical patent/EP0588465A1/fr
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna

Definitions

  • the present invention relates to a ceramic dielectric material for antennas.
  • the invention is directed to a ceramic dielectric material that lends itself particularly well for microstrip antennas such as communications antennas mounted on moving bodies and to a microstrip antenna formed of this ceramic dielectric material as well.
  • Microstrip antennas generally designed to receive relatively feeble radio waves from communication satellites are used on moving bodies such as cars, ships and airplanes, because they are of less air resistance, are well attachable to them, are simple in construction, have attractive appearance, and so on.
  • Such microstrip antennas are generally constructed from a flat plate form of dielectric material having a ground-side conductor on one side and a radiation conductor on the other or opposite side. On the one side of the dielectric material there is located an amplifier for amplifying radio signals received or transmitted by the radiation conductor.
  • the radiation conductor usually oscillates or receives quasi-micro or micro waves of about 1 to 10 GHz.
  • microstrip antennas are typically characterized by having a much narrower frequency bandwidth of, e.g., 1.8 to 3.5%, at the frequency used, when compared with other antennas such as Yagi and parabola antennas. For this reason, when moisture is adsorbed to the ceramic dielectric material forming them, their substantial relative dielectric constants change largely, giving rise to a deviation of their resonant frequencies f rc from the predetermined frequency, as will be understood from the following equation:
  • a ceramic material generally has open and closed pores. Especially in the case of some ceramic material having a large open pore rate, its relative dielectric constant increases, partly because of the skin effect, when water remains in the open pores, resulting in a variation of the oscillated or received central frequency mentioned above.
  • a primary object of the invention is to reduce the effect of water on a ceramic dielectric material.
  • the invention consists in presetting the water absorption of a ceramic dielectric material at a given or lower value.
  • a ceramic dielectric material for an antenna which is located between the ground-side and conductor electrodes of the antenna, said ceramic dielectric material being characterized by having a water absorption of 1.0% or below. It is noted that water absorption measurement is to be done according to JIS C2141.
  • the ceramic dielectric material is alumina or the ceramic dielectric material is a ceramic material based on CaTi0 3 -MgTi0 3 .
  • the ceramic dielectric material for an antenna according to the invention makes some considerable contribution to improving the reliability of the antenna, because its water absorption is preset at a given or lower value, so that its relative dielectric constant and, hence, its central frequency can be kept stable.
  • FIGURE 1 The rudimentary construction of a microstrip antenna - to which the invention is applied - is schematically represented in FIGURE 1.
  • the microstrip antenna shown at 1 is made up of a flat plate form of ceramic dielectric material 2 that may be in disc, rectangular or other configuration.
  • This material 2 is provided with a ground-side electrode 3 on the bottom and with a radiation electrode 4 on the top.
  • the ground-side electrode 3 is grounded by way of a conductor 5, and a conductor 6 coaxial with the conductor 5 is extended from the radiation electrode 4.
  • the feed is regulated to a given particle size distribution, and is then sintered at an elevated temperature for an extended time, using a pre-selected sintering aid.
  • the ceramic dielectric materials with varying water absorption rates were used to fabricate various microstrip antennas, which were then subjected to water immersion testing.
  • the procedure of the water immersion testing involved immersing each sample in water of 25°C held at atmospheric temperature for 24 hours, then removing the sample from the water to clear water droplets of its surface, and finally allowing it to stand alone in the air with a relative humidity of 50% and a temperature of 25°C for 10 minutes.
  • the wording "after immersion in water” is understood to refer to after the passing of 10 minutes during which the sample was allowed to stand alone in the air.
  • Table 3 results using alumina are shown in Table 3 and those using CaTi0 3 -MgTi0 3 are shown in Table 6.
  • the ceramic dielectric material for an antenna according to the invention which has a specific water absorption, it is possible for the antenna to receive a specific frequency and be improved in terms of reliability, as already noted.

Landscapes

  • Inorganic Insulating Materials (AREA)
EP93304068A 1992-09-11 1993-05-26 Diélectrique céramique pour antennes Withdrawn EP0588465A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP243634/92 1992-09-11
JP24363492 1992-09-11

Publications (1)

Publication Number Publication Date
EP0588465A1 true EP0588465A1 (fr) 1994-03-23

Family

ID=17106741

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93304068A Withdrawn EP0588465A1 (fr) 1992-09-11 1993-05-26 Diélectrique céramique pour antennes

Country Status (1)

Country Link
EP (1) EP0588465A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5859621A (en) * 1996-02-23 1999-01-12 Symmetricom, Inc. Antenna
US5945963A (en) * 1996-01-23 1999-08-31 Symmetricom, Inc. Dielectrically loaded antenna and a handheld radio communication unit including such an antenna
EP0999728A1 (fr) * 1998-11-04 2000-05-10 TELEFONAKTIEBOLAGET L M ERICSSON (publ) Composant électrique et module à circuit électrique ayant des plans de terre connectés
US6181297B1 (en) 1994-08-25 2001-01-30 Symmetricom, Inc. Antenna
US6300917B1 (en) 1999-05-27 2001-10-09 Sarantel Limited Antenna
US6369776B1 (en) 1999-02-08 2002-04-09 Sarantel Limited Antenna
US6552693B1 (en) 1998-12-29 2003-04-22 Sarantel Limited Antenna
US6690336B1 (en) 1998-06-16 2004-02-10 Symmetricom, Inc. Antenna
US20160156095A1 (en) * 2013-07-15 2016-06-02 Institut Mines Telecom / Telecom Bretagne Bung-type antenna and antennal structure and antennal assembly associated therewith

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4518737A (en) * 1978-12-26 1985-05-21 Rogers Corporation Dielectric material and method of making the dielectric material

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4518737A (en) * 1978-12-26 1985-05-21 Rogers Corporation Dielectric material and method of making the dielectric material

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
A.F. HARVEY: "Parallel-plate transmission systems for microwave frequencies", IEE PROCEEDINGS B. ELECTRICAL POWER APPLICATIONS, vol. 106, no. 25, January 1959 (1959-01-01), STEVENAGE GB, pages 129 - 139 *
H. JASIK: "Antenna engineering handbook", 1961, MCGRAW-HILL, NEW YORK *
K.R. CARVER ET AL.: "Microstrip antenna technology", IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, vol. 29, no. 1, January 1981 (1981-01-01), NEW YORK US, pages 2 - 24, XP002032227 *
P. LEMEUNIER: "Pour les circuits imprimés << hyperfréquences >> : les polymères fluorés", TOUTE L'ELECTRONIQUE, no. 416, December 1976 (1976-12-01), PARIS FR, pages 41 - 44 *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6181297B1 (en) 1994-08-25 2001-01-30 Symmetricom, Inc. Antenna
US5945963A (en) * 1996-01-23 1999-08-31 Symmetricom, Inc. Dielectrically loaded antenna and a handheld radio communication unit including such an antenna
US5859621A (en) * 1996-02-23 1999-01-12 Symmetricom, Inc. Antenna
US6690336B1 (en) 1998-06-16 2004-02-10 Symmetricom, Inc. Antenna
EP0999728A1 (fr) * 1998-11-04 2000-05-10 TELEFONAKTIEBOLAGET L M ERICSSON (publ) Composant électrique et module à circuit électrique ayant des plans de terre connectés
WO2000027174A1 (fr) * 1998-11-04 2000-05-11 Telefonaktiebolaget Lm Ericsson (Publ) Composant electrique et module circuit electrique avec plans de masse connectes
US6281844B1 (en) 1998-11-04 2001-08-28 Telefonaktiebolaget Lm Ericsson (Publ) Electrical component and an electrical circuit module having connected ground planes
US6552693B1 (en) 1998-12-29 2003-04-22 Sarantel Limited Antenna
US6369776B1 (en) 1999-02-08 2002-04-09 Sarantel Limited Antenna
US6300917B1 (en) 1999-05-27 2001-10-09 Sarantel Limited Antenna
US20160156095A1 (en) * 2013-07-15 2016-06-02 Institut Mines Telecom / Telecom Bretagne Bung-type antenna and antennal structure and antennal assembly associated therewith
US10944163B2 (en) * 2013-07-15 2021-03-09 Institut Mines Telecom/Telecom Bretagne Bung-type antenna and antennal structure and antennal assembly associated therewith

Similar Documents

Publication Publication Date Title
EP0588465A1 (fr) Diélectrique céramique pour antennes
US6218997B1 (en) Antenna for a plurality of radio services
DE69936657T2 (de) Zirkularpolarisierte dielektrische resonatorantenne
Mak et al. Broadband patch antenna with a T-shaped probe
US6967621B1 (en) Small low profile antennas using high impedance surfaces and high permeability, high permittivity materials
EP0996191A3 (fr) Système d&#39;antenne portant conformable pour exciter la structure d aéronef
FR2952240A1 (fr) Antenne a resonateur dielectrique a double polarisation
CA2156403A1 (fr) Antenne conique de faible hauteur
Denoth The pendular-funicular liquid transition and snow metamorphism
US4866016A (en) Alumina-based ceramic composition
DE19917087A1 (de) Hochfrequenzfilter
DE60105447T2 (de) Gedruckte patch-antenne
WO2015124463A1 (fr) Antenne à plusieurs gammes de fréquences pour un dispositif émetteur et/ou récepteur destiné à une utilisation mobile
JPH06140832A (ja) アンテナ用セラミック誘電体
WO2002009232A1 (fr) Dispositif d&#39;emission et/ou de reception d&#39;ondes electromagnetiques et procede de fabrication dudit dispositif
Zhou et al. Cumulative distributions of rainfall rate and microwave attenuation in Singapore's tropical region
KR100307886B1 (ko) 고주파용 유전체 조성물
US4808951A (en) Dielectric filter
US3739391A (en) Metallized channel guide antenna
SU1103316A1 (ru) Микрополоскова антенна
CA1268035A (fr) Porcelaine dielectrique, et resonateur qui en est garni
Al-Charchafchi et al. A stacked annular-ring microstrip patch antenna
Chamrasruangrong et al. Short-term Frequency Spectra of Amplitude Scintillation Observed by Thaicom Broadcasting Satellite
JP2008066585A (ja) 電波吸収体及びその製造方法
CN109665842A (zh) 改性BaO-TiO2-Pr6O11介电陶瓷的制备方法

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB IT

17P Request for examination filed

Effective date: 19940606

17Q First examination report despatched

Effective date: 19960927

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19970208