WO2000046874A1 - Compact wideband antenna - Google Patents
Compact wideband antenna Download PDFInfo
- Publication number
- WO2000046874A1 WO2000046874A1 PCT/US2000/002717 US0002717W WO0046874A1 WO 2000046874 A1 WO2000046874 A1 WO 2000046874A1 US 0002717 W US0002717 W US 0002717W WO 0046874 A1 WO0046874 A1 WO 0046874A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- antenna
- radiator
- cap
- stud
- housing
- Prior art date
Links
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
- H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
- H01Q9/32—Vertical arrangement of element
- H01Q9/36—Vertical arrangement of element with top loading
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/362—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith for broadside radiating helical antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
- H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
Definitions
- the invention pertains to antennas usable at 800MHz and 900 MHz radiating frequencies More particularly, the invention pertains to compact, omnidirectional, broadband antennas usable in multiple bands encompassing 800-1000 MHz service.
- whip antennas While generally useful for their intended purposes, known whip antennas tend to be bendable or breakable even when the vehicle is only driven through a car wash This has been a long term inconvenience to users Another issue involves bandwidth, and impedance characteristics in view of the proliferating number of services operating in different bands It is inconvenient and expensive to have to manufacture, stock and install different antennas for different services
- a mobile or fixed station antenna has a compact profile and a wide instantaneous operating bandwidth
- the antenna enhances performance by enabling the transmission of signals over a very broad frequency bandwidth
- a single compact wideband antenna in accordance with the present invention provides supe ⁇ or antenna performance across multiple communication system bands, such as cellular AMPS, 800 MHz special mobile radio (SMR), 900 MHz ISM, and 900 MHz GSM Enhanced performance is achieved as a result of a compact, rugged, physical package that may be shorter than a standard quarter wave monopole
- the antenna does not have an exposed metal rod, or whip, as is standard for mobile antennas
- the conductive portion of the antenna is either enclosed in a protective housing, or is itself part of the housing enclosure
- the antenna includes a non-conductive protective housing which encloses, at least in part, a vertical conductive mast
- a contact at the antenna's base transfers energy from the base connector to the vertical conductive assembly
- Various types of RF connectors could be used
- the antenna can be coupled to industry standard mobile antenna mounts This allows for easy replacement of existing hardware
- the antenna radiator includes a conductive, elongated element of appropriate length for the desired operating frequency
- a conductive disc is connected to a distal end thereof
- the element is rod-like
- the element includes a helical coil with axially extending leads
- the element has an over-all length less than one-quarter wavelength of a selected operating frequency
- the respective radiator is substantially self- supporting with the radiator extending from an RF-type connector
- the radiator need axial support from an axially extending support such as an axially oriented printed circuit board
- the conductive disc serves dual electrical and mechanical functions Electrically, the disc functions as the top portion of the radiating antenna assembly Mechanically, it serves as the top cap for the compact wideband antenna assembly
- a metal ring at the base of the non-conductive housing can be used to fine-tune antenna performance
- antenna impedance can be tuned using a fixed capacitor coupled between the radiator and a ground
- Fig 1 illustrates an exploded view of a compact wideband antenna in accordance with the present invention
- Fig 2 is a side view of certain structural component of the preferred embodiment of the present invention.
- Fig 3 is a side view of an alternate embodiment of antenna of the present invention.
- Fig 4 A, 4B together illustrate exploded and assembled views of another embodiment of the present invention
- Fig 5 illustrates measured comparative VSWR plots vs frequency over a 900-2900 MHz range
- Fig 6 is a plot of measured VSWR over an 800-1000 MHz range
- Fig 7 illustrates comparative plots of antenna gain over an 770-970 MHz range
- Fig 8 illustrates measured VSWR over a 400-600 MHz range
- Fig 9 illustrates an assembled view of a dualband embodiment of the present invention.
- Fig 10 is a plot of measured VSWR of the dualband embodiment over an 800-2000 MHz range Detailed Description of the Preferred Embodiments:
- a compact wideband antenna assembly 10 is illustrated located on a conductive ground plane 12
- the compact antenna assembly can be threaded onto one of the standard mobile antenna mounts 16 used by the mobile industry
- the assembly 10 can also be mounted on other connector bases for use as a high performance fixed station antenna
- a signal source feedline 18, typically a coaxial cable, can be used to energize the assembly 10
- the assembly 10 includes a disc shaped metal radiator 22 which contains a central bore 22a which receives an end 26a of elongated radiator 26. A proximal end 26b engages mount 16.
- a non-conductive, hollow, molded housing 30 surrounds radiator 26.
- a distal end 30a abuts adjacent cap or radiator 22.
- a proximal end 30b slidably engages an optional, annular metal ring 32 which can be incorporated to improve performance.
- the non-conductive housing 30 serves to encapsulate the vertical conductive mast 26 and to provide mechanical support to the assembly 10
- the vertical conductive mast 26 is attached to the cap 22.
- one attachment method is to screw the threaded mast 26 into a tapped hole 22a in the bottom of the cap 22
- the ring 32 provides fine tuning of the antenna impedance As illustrated in the embodiment 10a of Fig. 3, the ring 32 can also be made from a non-conductive material such as PVC In this embodiment, the entire housing 30', as shown in Fig 3 can be formed of a single molded member.
- a washer 34 supports the conductive mast 26 and provides the correct physical alignment
- a spring-loaded contact 26c provides contact between the mount 16 and the vertical mast 26
- the contact 26c could also be formed as a leaf spring, or other conductive device
- the conductive cap 22 serves a dual mechanical and electrical function
- the mechanical function of the cap 22 is to act as the top enclosure of the assembly 10 and to provide mechanical strength to the assembly 10.
- the metallic cap 22 provides a capacitive load, thereby reducing the physical height of the assembly 10
- the electrical loading created by the cap 22 provides a more stable antenna impedance as a function of frequency than standard vertical monopole antennas
- the impedance bandwidth of the wideband antenna 10 is more than twice as great
- the cylindrical vertical conductive mast 26 is replaced by a helical wound coil 46 with top and bottom leads 46a, b
- the length of the vertical element is less than one quarter wavelength at the center of the frequency band
- a tuning capacitor 48 may be used to match the antenna impedance to fifty ohms.
- the tuning capacitor 48 leads are connected between a vertical element contact ring 50a and a ground contact ring 50b As noted above, the effective length of the coil 46 and leads 46a, b is less than one-quarter wavelength of a selected frequency The diameter of coil 46 is selected to optimize antenna performance
- Fig 5 illustrates comparative VSWR plots of the antenna 10 and a quarter wave monopole
- the antenna 10 has a VSWR less than 1 6- 1 over a frequency range from 990 to 2880 MHz, greater than 97% bandwidth
- the quarter wave monopole 1 6 1 VSWR bandwidth is only in a range of 1950 MHz to under 2300 MHz
- the antenna 10 tuned for the cellular AMPS frequency band has an impedance bandwidth that ranges from 775 MHz to 960 MHz at a VSWR of better than 1.6 1, see Fig 6
- This antenna is less than 6 1 cm tall, 30% shorter than a quarter wavelength monopole (quarter wavelength equals 8 72 cm at 860 MHz)
- the present antenna is also a more efficient wideband radiator than a quarter wave monopole, translating into a flatter gain response versus frequency
- Fig 7 illustrates comparative measured relative antenna gain for the antenna 10 and a quarter wave monopole
- the gain of antennas in accordance with the present invention is substantially constant over 805-935 MHz band
- an antenna 10 tuned for the UHF frequency band exhibited an impedance bandwidth of 465 MHz to 512 MHz with a VSWR less than 1 7 1 This wide bandwidth performance was achieved with an antenna 8 3 cm tall, or 0 13 wavelengths
- the antenna 10 can be optimized for dualband cellular AMPS (824-896 MHz) and PCS (1850-1900 MHz) operation
- Fig 9 illustrates the dimensions of one dualband implementation of the antenna 10c
- the overall height of the antenna less than 4 6 cm.
- a 100 pf capacitor 51 coupled between radiator 26 and ground, is used to optimize the antenna impedance in the two frequency bands
- Fig 10 illustrates the measured VSWR of the antenna 10c
- the peak VSWR is less than 1 85 1 in the AMPS band, and less than 1 7 1 in the PCS band
- Overall antenna height is less than one eighth of one wavelength a frequency of 824 MHz
- an antenna assembly such as antenna 10 can be expected to achieve superior wideband performance in both radiation efficiency and impedance bandwidth
- antennas such as antenna 10 exhibit the following performance features
- a wideband antenna as disclosed provides a novel means for a mobile or fixed station antenna with extremely wideband performance in a very rugged, durable package
Landscapes
- Details Of Aerials (AREA)
- Support Of Aerials (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU36962/00A AU3696200A (en) | 1999-02-04 | 2000-02-03 | Compact wideband antenna |
EP00915737A EP1151496A4 (en) | 1999-02-04 | 2000-02-03 | Compact wideband antenna |
CA002361446A CA2361446A1 (en) | 1999-02-04 | 2000-02-03 | Compact wideband antenna |
MXPA01007933A MXPA01007933A (en) | 1999-02-04 | 2000-02-03 | Compact wideband antenna. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11860099P | 1999-02-04 | 1999-02-04 | |
US60/118,600 | 1999-02-04 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2000046874A1 true WO2000046874A1 (en) | 2000-08-10 |
WO2000046874A9 WO2000046874A9 (en) | 2001-08-30 |
Family
ID=22379601
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2000/002717 WO2000046874A1 (en) | 1999-02-04 | 2000-02-03 | Compact wideband antenna |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1151496A4 (en) |
AU (1) | AU3696200A (en) |
WO (1) | WO2000046874A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003030302A1 (en) * | 2001-09-29 | 2003-04-10 | Motorola Inc | Helical antenna |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4328501A (en) * | 1980-04-23 | 1982-05-04 | The United States Of America As Represented By The Secretary Of The Army | Small broadband antennas using lossy matching networks |
US4366486A (en) * | 1981-03-16 | 1982-12-28 | Northern Illinois Gas Company | Low profile antenna for data transponders |
US5329287A (en) * | 1992-02-24 | 1994-07-12 | Cal Corporation | End loaded helix antenna |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3852756A (en) * | 1974-02-15 | 1974-12-03 | Us Navy | Electrically small resonant antenna with capacitively coupled load |
US5218372A (en) * | 1992-05-15 | 1993-06-08 | Cheng Chen Sheng | Wide band spherical antenna with improved impedance-matching circuit |
US5708445A (en) * | 1993-01-29 | 1998-01-13 | Motorola, Inc. | Antenna assembly for radio circuit and method therefor |
GB2317994B (en) * | 1996-10-02 | 2001-02-28 | Northern Telecom Ltd | A multiresonant antenna |
-
2000
- 2000-02-03 EP EP00915737A patent/EP1151496A4/en not_active Withdrawn
- 2000-02-03 WO PCT/US2000/002717 patent/WO2000046874A1/en not_active Application Discontinuation
- 2000-02-03 AU AU36962/00A patent/AU3696200A/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4328501A (en) * | 1980-04-23 | 1982-05-04 | The United States Of America As Represented By The Secretary Of The Army | Small broadband antennas using lossy matching networks |
US4366486A (en) * | 1981-03-16 | 1982-12-28 | Northern Illinois Gas Company | Low profile antenna for data transponders |
US5329287A (en) * | 1992-02-24 | 1994-07-12 | Cal Corporation | End loaded helix antenna |
Non-Patent Citations (1)
Title |
---|
See also references of EP1151496A4 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003030302A1 (en) * | 2001-09-29 | 2003-04-10 | Motorola Inc | Helical antenna |
Also Published As
Publication number | Publication date |
---|---|
WO2000046874A9 (en) | 2001-08-30 |
AU3696200A (en) | 2000-08-25 |
EP1151496A4 (en) | 2005-01-12 |
EP1151496A1 (en) | 2001-11-07 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP4298173B2 (en) | Circularly polarized dielectric resonator antenna | |
US7339542B2 (en) | Ultra-broadband antenna system combining an asymmetrical dipole and a biconical dipole to form a monopole | |
EP1291967B1 (en) | Multifrequency antenna | |
US6856286B2 (en) | Dual band spiral-shaped antenna | |
US9786990B2 (en) | Integrated multiband antenna | |
US6611691B1 (en) | Antenna adapted to operate in a plurality of frequency bands | |
AU724495B2 (en) | Dual band antenna | |
US20060284770A1 (en) | Compact dual band antenna having common elements and common feed | |
WO2002052679A1 (en) | Dual band wideband adjustable antenna assembly | |
US4890116A (en) | Low profile, broad band monopole antenna | |
KR20000010756A (en) | Antenna device having a matching means | |
US6448934B1 (en) | Multi band antenna | |
US7158819B1 (en) | Antenna apparatus with inner antenna and grounded outer helix antenna | |
US6229495B1 (en) | Dual-point-feed broadband whip antenna | |
CN101283482A (en) | Subminiature internal antenna | |
US4958164A (en) | Low profile, broad band monopole antenna | |
CA1123511A (en) | Wideband antenna with frequency dependent ferrite core inductor | |
US6798388B2 (en) | Stubby, multi-band, antenna having a large-diameter high frequency radiating/receiving element surrounding a small-diameter low frequency radiating/receiving element | |
GB2335312A (en) | An antenna adapted to operate in a plurality of frequency bands | |
WO2000046874A1 (en) | Compact wideband antenna | |
GB2316539A (en) | A broadband monopole antenna | |
CA2361446A1 (en) | Compact wideband antenna | |
CN109449611B (en) | Parasitic monopole multi-frequency adjustable-frequency antenna system | |
WO1999013530A1 (en) | Dual band, panel mount antenna | |
KR20040004219A (en) | Wide band antenna for wireless LAN |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AL AM AT AU AZ BA BB BG BR BY CA CH CN CR CU CZ DE DK DM EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT TZ UA UG UZ VN YU ZA ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): GH GM KE LS MW SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
ENP | Entry into the national phase |
Kind code of ref document: A Ref document number: 2361446 Country of ref document: CA |
|
WWE | Wipo information: entry into national phase |
Ref document number: PA/a/2001/007933 Country of ref document: MX Ref document number: 2000915737 Country of ref document: EP |
|
AK | Designated states |
Kind code of ref document: C2 Designated state(s): AE AL AM AT AU AZ BA BB BG BR BY CA CH CN CR CU CZ DE DK DM EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT TZ UA UG UZ VN YU ZA ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: C2 Designated state(s): GH GM KE LS MW SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG |
|
COP | Corrected version of pamphlet |
Free format text: PAGES 1/9-9/9, DRAWINGS, REPLACED BY NEW PAGES 1/8-8/8; DUE TO LATE TRANSMITTAL BY THE RECEIVING OFFICE |
|
WWP | Wipo information: published in national office |
Ref document number: 2000915737 Country of ref document: EP |
|
REG | Reference to national code |
Ref country code: DE Ref legal event code: 8642 |
|
WWW | Wipo information: withdrawn in national office |
Ref document number: 2000915737 Country of ref document: EP |