GB2447244A - Circularly polarized antenna with a radiating element surrounding a coupling element - Google Patents
Circularly polarized antenna with a radiating element surrounding a coupling element Download PDFInfo
- Publication number
- GB2447244A GB2447244A GB0704299A GB0704299A GB2447244A GB 2447244 A GB2447244 A GB 2447244A GB 0704299 A GB0704299 A GB 0704299A GB 0704299 A GB0704299 A GB 0704299A GB 2447244 A GB2447244 A GB 2447244A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circularly polarized
- dielectric substrate
- polarized antenna
- substrate
- coupling element
- 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- Withdrawn
Links
- 230000008878 coupling Effects 0.000 title claims abstract description 24
- 238000010168 coupling process Methods 0.000 title claims abstract description 24
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 24
- 239000000758 substrate Substances 0.000 claims abstract description 58
- 229910010293 ceramic material Inorganic materials 0.000 claims abstract description 3
- 230000010354 integration Effects 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract 1
- 230000005855 radiation Effects 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000010295 mobile communication Methods 0.000 description 2
- 240000006365 Vitis vinifera Species 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
- H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
-
- 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
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
-
- 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
- H01Q9/0428—Substantially flat resonant element parallel to ground plane, e.g. patch antenna radiating a circular polarised wave
-
- 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
- H01Q9/045—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means
- H01Q9/0457—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means electromagnetically coupled to the feed line
-
- 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
- H01Q9/0464—Annular ring patch
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Waveguide Aerials (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
A circularly polarized antenna 1 comprises a first dielectric substrate 11 with a ground element 12 on a first surface 111 and a feeding element 13 formed on a second surface 112. A second dielectric substrate 21 is arranged with a first surface 211 arranged adjacent to the second surface 112 of the first substrate 11. A coupling element 23 surrounded by a radiating element 22 are formed on the second surface 212 of the second substrate 21. The second substrate 21 is arranged such that it overlaps a portion of the feeding element 13. The first substrate 11 may be a rectangular sheet of FR-4 material with a rectangular ground element 12. The second substrate 21 may be a cylindrical member made from ceramic material. The feed element 13 may be a metallic strip, the coupling element 23 may be sector-shaped and the radiating element 22 ring-shaped. The antenna 1 may provide a light, compact, broadband, single -fed, circularly polarized antenna with easy adjustments for impedance matching, which is suitable for integration into smart handsets.
Description
CIRCULARLY POLARIZED MTTENNA
This invention relates to a circularly polarized antenna, more particularly to a circularly polarized antenna that is suitable for application to mobile communications devices.
The increase in market share of smart handsets makes incorporation of global positioning system (GPS) functjonaljtjeg, such as receiving of GPS signals, onto the smart handsets inevitable. Thus, integration of a circularly polarized antenna and the smart handset is a significant consideration since the GPS signals can only be efficiently received using the circularly polarized antenna.
Numerous circularly polarized antennas of single-fed or dual-fed type have been proposed in the art. The single-fed circularly polarized antenna, however, has the disadvantages of having a narrow operating frequency bandwidth and not being easy to adjust for impedance matching. The dual-fed circularly polarized antenna, on the other hand, has the disadvantages of being bulky and heavy.
The aforementioned conventional circularly polarized antennas are therefore not suitable for integration with the smart handsets.
Therefore, the object of the present invention is to provide a circularly polarized antenna that can
overcome the aforesaid drawbacks of the prior art.
According to the present invention, a circularly polarized antenna comprises first and second dielectric substrates, a grounding element, a feeding element, a coupling element, and a radiating element. The first dielectric substrate has opposite first and second surfaces. The grounding element is formed on the first surface of the first dielectric substrate. The feeding element is formed on the 5econcl surface of the first dielectric substrate. The second dielectric substrate hasafirstsurfacethatisdjsposedonthesecofldsurface of the first dielectric substrate and that overlaps a portion of the feeding element, and a second surface that is opposite to the first surface of the second dielectric substrate. The coupling element is formed onthe second surface of the seconddielectrjc substrate.
The radiating element is formed on the second surface of the second dielectric substrate and surrounds the coupling element.
Other features and advantages of the present invention will become apparent in the following detailed description of the preferred embodiment with reference to the accompanying drawings, of which: Figure 1 is a perspective view of the preferred embodiment of a circularly polarized antenna according to the present invention; Figure 2 is a schematic top view of Figure 1; Figure 3 is a plot illustrating a return loss of the preferred embodiment; Figure 4 is a Smith chart illustrating experimental results of the preferred embodiment; Figure 5 is a plot illustrating a radiation pattern of the preferred embodiment on the xz plane; Figure 6 is a plot illustrating a radiation pattern of the preferred embodiment on the xy plane; Figure 7 is a plot illustrating an axial ratio of the preferred embodiment; and Figure 8 is a plot illustrating an antenna gain of the preferred embodiment.
Referring to Figures 1 and 2, the preferred embodiment of a circularly polarized antenna 1 according to this invention is shown to include first and second dielectric substrates 11, 21, a grounding element 12, a feeding element 13, a coupling element 23, and a radiating element 22.
The circularly polarized antenna 1 of this embodiment is designed to operate at a center frequency of 2700 MHz.
The first dielectric substrate 1]. is generally square in shape, and has opposite first and second surfaces 111, 112. In this embodiment, the first dielectric substrate 11 has dimensions of 30 millimeters by 30 millimeters. Preferably, the first dielectric substrate 11 is a FR-4 substrate.
In an alternative embodiment, the first dielectric substrate 11 is circular in shape.
The grounding element 12 is generally square in shape and is formed on the first surface 11? of the first dielectric substrate 11. In this embodiment, the grounding element 12 has the same dimensions as the first dielectric substrate 11.
In an alternative embodiment, the grounding element 12 is circular or triangular in shape.
The feeding element 13 is generally rectangular in shape, is formed on the second surface 112 of the first dielectric substrate 11, and extends from a first side 113 of the first dielectric substrate 11 toward a center of the second surface 112 of the first dielectric substrate 11. In this embodiment, the feeding element 13 has dimensions of 13.5 millimeters by 3 millimeters.
Preferably, the feeding element 13 is a metallic strip, such as a micro-strip.
In an alternative embodiment, the feeding element 13 is L-shaped, cross-shaped, or X-shaped.
In yet another embodiment, the feeding element 13 is a coplanar waveguide (CPW), a slot feed, or a slot line.
The circularly polarized antenna 1 further includes a feeding point 131 provided on the feeding element 13 and disposed proximate to the first side 113 of the first dielectric substrate 11.
The second dielectric substrate 21 is cylindrical in shape, has a first surface 211 that is disposed on the second surface 112 of the first dielectric substrate 11 arid that overlaps a portion of the feeding element 13, anda second surface 212 opposite to the first surface 211 of the second dielectric substrate 21. In this embodiment, the second dielectric substrate 21 has a Preferably, the second dielectric substrate 21 is made from a ceramic material.
In an alternative embodiment, the second dielectric substrate 21 is cubic in shape.
In yet another embodiment, the second dielectric substrate 21 is a FR-4 substrate.
The coupling element 23 is sector-shaped, has opposite sides 231, 232, and is formed on the second surface 212 of the second dielectric substrate 21. In this embodiment, each of the opposite sides 231, 232 of the coupling element 23 has a dimension of 5 millimeters. Preferably, the opposite sides 231, 232 of the coupling element 23 define an angle of 90 degrees the rebe tweeri.
In an alternative embodiment, the coupling element 23 is rectangular, square, triangular, or semi-circular in shape.
The radiating element 22 is ring-shaped, is formed on the second surface 212 of the second dielectric substrate 21, and surrounds the coupling element 23.
In this embodiment, the radiating element 22 has an outer radius of 7 millimeters and an inner radius of 6 millimeters.
In an alternative embodiment, the radiating element 22 is rectangular, square, triangular, or elliptical in shape.
It is noted herein that, in this embodiment, since the coupling element 23 is formed on the second dielectric substrate 21 such that the coupling element 23 is disposed closer to a second side 114 of the first dielectric substrate 11 rather than to a third side 115 of the first dielectric substrate 11, the circularly polarized antenna 1 of this embodiment is a right hand circularly polarized (RHCP) antenna. Alternatively, when a left hand circularly polarized (LHCP) antenna is desired, the coupling element 23 may be simply formed on the second dielectric substrate 21 such that the coupling element 23 is disposed closer to the third side 115 of the first dielectric substrate 11 rather than to the second side 114 of the first dielectric substrate 11.
Figures 3 to 8 are plots from experimental results atthecenterfrequency (i.e., 2700MHz) ofthecircularly polarized antenna 1 of this invention. As illustrated in Figure 3, the circularly polarized antenna 1 of this invention achieves an impedance bandwidth of approximately 65MHZ (i.e. 2675 to 2740MHz) forareturn loss of -10dB (i.e., VSWR =2) . Moreover, as illustrated in Figures 5 and 6, the circularly polarized antenna 1 of this invention achieves a half power beamwidth of degrees for a ripple that ranges from OdE to 3dB.
Further, asillustratedinFigures7and 8, the circularly polarized antenna 1 of this invention achieves an axial ratio of less than 3dB (e.g., 0.5dB) and an antenna gain that varies between 2.5dBi and 3.5dBi.
It is noted that signals from a signal source (not shown) are fed to the circularly polarized antenna 1 of this invention through electromagnetic coupling between the feeding element 13, and the coupling and radiating elements 23, 22. That is, there is no physical connection between the feeding element 13, and the coupling and radiating elements 23, 22. Instead, the feeding element 13 generates an electric field radiation that radiates upwardly therefrom when the signal from the signal source, in the form of electric field energy, is transmitted therethrough. Moreover, the dimensions of the feeding element 13 may be simply adjusted for the purpose of impedance matching.
From the above description, since each of the first and second dielectric substrates 11, 21, the feeding element 13, the coupling element 23, and the radiating element 22 has a relatively small physical size, and sincethereisnophysical connectionbetween.the feeding element 13, and the coupling and radiating elements 23, 22, the circularly polarized antenna 1 of this invention is suitable for application to mobile communications devices, such as a smart handset.
Claims (10)
- CLAIMS: I. A circularly polarized antenna, comprising: a firstdielectric substrate having opposite first and second surfaces; a grounding element formed on said first surface of said first dielectric substrate; a feeding element formed on said second surface of said first dielectric substrate; a second dielectric substrate having a first surface that is disposed on said second surface of said first dielectric substrate and that overlaps a portion of said feeding element, and a second surface that is opposite to said first surface of said second dielectric substrate; a coupling element formed on said second surface of said second dielectric substrate; and a radiating element formed on said second surface of said second dielectric substrate and surround ng said coupling element.
- 2. The circularly polarized antenna as claimed in Claim 1, wherein said first dielectric substrate is generally rectangular in shape.
- 3. The circularly polarized antenna as claimed in Claim 1, wherein said first dielectric substrate is a FR-4 substrate.
- 4. The circularly polarized antenna as claimed in Claim 1, wherein said grounding element is generally rectangular in shape.
- 5. The circularly polarized antenna as claimed in Claim 1, wherein said feeding element is a metallic strip.
- 6. The circularly polarized antenna as claimed in Claim 1., wherein said second dielectric substrate is cylindrical in shape.
- 7. The circularly polarized antenna as claimed in Claim 1, wherein said second dielectric substrate is made from a ceramic material.
- 8. The circularly polarized antenna as claimed in Claim 1, wherein said coupling element is sector-shaped.
- 9. The circularly polarized antenna as claimed in Claim 1, wherein said radiating element is ring-shaped.
- 10. A circularly polarized antenna substantially as hereiribefore described with reference to and as illustrated in the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0704299A GB2447244A (en) | 2007-03-06 | 2007-03-06 | Circularly polarized antenna with a radiating element surrounding a coupling element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0704299A GB2447244A (en) | 2007-03-06 | 2007-03-06 | Circularly polarized antenna with a radiating element surrounding a coupling element |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB0704299D0 GB0704299D0 (en) | 2007-04-11 |
| GB2447244A true GB2447244A (en) | 2008-09-10 |
Family
ID=37966006
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0704299A Withdrawn GB2447244A (en) | 2007-03-06 | 2007-03-06 | Circularly polarized antenna with a radiating element surrounding a coupling element |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2447244A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110163921A1 (en) * | 2010-01-06 | 2011-07-07 | Psion Teklogix Inc. | Uhf rfid internal antenna for handheld terminals |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4943809A (en) * | 1985-06-25 | 1990-07-24 | Communications Satellite Corporation | Electromagnetically coupled microstrip antennas having feeding patches capacitively coupled to feedlines |
| WO1991017585A1 (en) * | 1990-04-20 | 1991-11-14 | Consejo Superior Investigaciones Cientificas | Microstrip radiator for circular polarization free of welds and floating potentials |
| EP0818846A2 (en) * | 1996-07-12 | 1998-01-14 | Harada Industry Co., Ltd. | Planar antenna |
| EP1357636A2 (en) * | 2002-04-25 | 2003-10-29 | Matsushita Electric Industrial Co., Ltd. | Multiple-resonant antenna, antenna module, and radio device using the multiple-resonant antenna |
| EP1450438A1 (en) * | 2001-11-28 | 2004-08-25 | Nippon Antena Kabushiki Kaisha | Composite antenna |
-
2007
- 2007-03-06 GB GB0704299A patent/GB2447244A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4943809A (en) * | 1985-06-25 | 1990-07-24 | Communications Satellite Corporation | Electromagnetically coupled microstrip antennas having feeding patches capacitively coupled to feedlines |
| WO1991017585A1 (en) * | 1990-04-20 | 1991-11-14 | Consejo Superior Investigaciones Cientificas | Microstrip radiator for circular polarization free of welds and floating potentials |
| EP0818846A2 (en) * | 1996-07-12 | 1998-01-14 | Harada Industry Co., Ltd. | Planar antenna |
| EP1450438A1 (en) * | 2001-11-28 | 2004-08-25 | Nippon Antena Kabushiki Kaisha | Composite antenna |
| EP1357636A2 (en) * | 2002-04-25 | 2003-10-29 | Matsushita Electric Industrial Co., Ltd. | Multiple-resonant antenna, antenna module, and radio device using the multiple-resonant antenna |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110163921A1 (en) * | 2010-01-06 | 2011-07-07 | Psion Teklogix Inc. | Uhf rfid internal antenna for handheld terminals |
| US9455488B2 (en) | 2010-01-06 | 2016-09-27 | Psion Inc. | Antenna having an embedded radio device |
| US9496596B2 (en) | 2010-01-06 | 2016-11-15 | Symbol Technologies, Llc | Dielectric structure for antennas in RF applications |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0704299D0 (en) | 2007-04-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |