EP2132824A1 - A direct current energy supplying antenna structure - Google Patents
A direct current energy supplying antenna structureInfo
- Publication number
- EP2132824A1 EP2132824A1 EP08723893A EP08723893A EP2132824A1 EP 2132824 A1 EP2132824 A1 EP 2132824A1 EP 08723893 A EP08723893 A EP 08723893A EP 08723893 A EP08723893 A EP 08723893A EP 2132824 A1 EP2132824 A1 EP 2132824A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- direct current
- current energy
- antenna structure
- additional
- resistive 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- Withdrawn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
- 238000004891 communication Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000010295 mobile communication Methods 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000000872 buffer Substances 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000005476 soldering 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
- H01Q1/248—Supports; Mounting means by structural association with other equipment or articles with receiving set provided with an AC/DC converting device, e.g. rectennas
-
- 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 invention relates to a direct current energy supplying antenna structure for converting radio frequency energy to direct current energy, comprising a micro strip patch antenna and a rectifier circuitry.
- Such direct current energy supplying antenna structures are known for providing direct current energy to wireless mobile communication devices, thereby reducing the need for local energy suppliers, such as batteries.
- the invention aims at obtaining a direct current energy supplying antenna structure according to the preamble wherein the antenna structure can be used for both providing direct current energy and wireless communicating.
- the antenna structure further comprises a resistive element arranged in series with the rectifier circuitry, the resistive element and the rectifier circuitry forming an interconnection circuit and connecting a printed pattern near an edge of the micro strip patch on a first side of a dielectric layer to a ground plane on a second side, opposite to the first side of the dielectric layer, and wherein the patch antenna is connected to a signal output port.
- DC power can advantageously be retrieved from RF energy that is received by the antenna.
- wireless communication signals can be retrieved.
- an antenna structure comprising a resistive element connecting a printed pattern on a first side of a dielectric layer with a ground plane on a second, opposite to the first side of the dielectric layer near an edge of the strip patch, is known per se, see e.g. 'Broadband circularly polarised square microstrip antenna using chip -resistor loading' by C-Y. Huang a.o.
- the direct current energy supplying antenna structure according to the invention can advantageously be used for mobile communication devices, especially in low power wireless communication applications with reduced power sources, or in applications wherein the use of local power sources is even undesired or impossible.
- Examples of low power wireless communication applications are autonomous low poser low duty cycle sensors, such as a temperature sensor.
- the direct current energy supplying antenna structure further comprises an additional resistive element arranged in series with an additional rectifier circuitry, the additional resistive element and the additional rectifier circuitry forming an additional interconnection circuit and connecting a printed pattern near an additional edge of the micro strip patch on the first side of a dielectric layer with a ground plane on the second side of the dielectric layer, wherein the edge and the additional edge are oriented substantially transverse with respect to each other.
- more DC energy can be obtained from RF waves as radio waves having different polarizations interact substantially with one or both rectifier circuitries.
- Fig. 1 shows a direct current energy supplying antenna structure according to the invention.
- the antenna structure 1 comprises a micro strip patch antenna 2 implemented in a planar structure.
- the antenna 2 is connected to an output port 9 serving as a signal output port for enabling wireless communication.
- the connection between the antenna and the output port is implemented as a transmission line segment that is realized in the same technology as the patch antenna. In principle, however, also other techniques are available, such as a coax cable.
- the transmission line and the patch 2 are realized using micro strip technology.
- a ground plate of a printed circuit board serves as the earth, while on the opposite side of the board an electrically conducting pattern is printed. It is noted, however, that also other techniques could be used, such as etching techniques.
- the printed circuit board has dielectric properties to electromagnetically couple the printed pattern and the ground plate.
- the transmission line segment is formed as printed tracks.
- the patch is formed as a rectangular plane section that is designated for optimal receipt and transmission of e.g. 2.45 GHz.
- a first edge 3 of the patch 2 is connected via a rectifier circuitry 7 in series with a discrete resistive element 10 to an electrically conducting via 5 that is connected to the ground plane of the antenna structure 1.
- the discrete resistive element 10 is assembled on the side of the printed circuit board on which the electrically conducting pattern is printed. Alternatively, the discrete resistive element 10 is arranged in the via 5 interconnecting both opposite surfaces of the printed circuit board.
- a second edge 4 being oriented substantially transverse with respect to the first edge 3, is similarly connected in series via a rectifier circuitry 8 and a discrete resistive element 11 to an additional via 6 interconnecting both opposite surfaces of the printed circuit board.
- the rectifier circuitries 7, 8 are e.g. implemented as a single diode component. However, also other rectifier circuitries 7, 8 are possible, such as a diode structure having two anti-parallel arranged diode components for improved gain of the direct current energy.
- the DC energy is retrieved by connecting to interconnection, output ports of the rectifier circuitries 7, 8 and can be fed to local energy buffers, such as a capacitor or a rechargeable battery. Any communication radio signal received by the patch 2 can be retrieved from the signal port 9.
- circuitries 7, 8 and the discrete resistors 10, 11 might be connected to the other components of the patch 2 using several techniques, such as soldering, gluing or otherwise to obtain an electrical conducting connection. Further, a more complex diode structure can be employed to further enhance a direct current energy retrieval from the received radio waves.
- the rectifier circuitry and the resistive element are arranged in series, forming an interconnecting circuit and connecting an edge of the printed pattern patch to the ground plane.
- one port of the rectifier circuitry is connected to the patch edge.
- the relative position of the rectifier circuitry and the resistive element in the interconnecting circuit can mutually be interchanged, so that a port of the resistive element is connected to the patch edge.
- geometries of the antenna patches can also be designed for performing wireless communication using radio waves having other frequencies, e.g. more or less than 2.45 GHz.
- the resistor in stead of using a discrete resistor in series with a rectifier circuitry, the resistor can be implemented integrally with a via structure interconnecting the printed pattern with the ground plane.
- an additional signal output port can be connected to an edge of the patch 2 in a substantially transverse orientation with respect to the earlier described signal output port 12, thereby enabling retrieval of mutually orthogonal oriented radio waves.
- transmission line segments interconnecting the micro strip patch with the signal output ports, respectively are oriented substantially mutually transversely and connected to the patch at edges that are oriented substantially mutually transversely.
Landscapes
- Waveguide Aerials (AREA)
Abstract
The invention relates to a direct current energy supplying antenna structure for converting radio frequency energy to direct current energy. The antenna structure comprises a micro strip patch antenna and a rectifier circuitry. The antenna structure further comprises a resistive element arranged in series with the rectifier circuitry. The resistive element and the rectifier circuitry form an interconnection circuit and connect a printed pattern near an edge of the micro strip patch on a first side of a dielectric layer to a ground plane on a second side, opposite to the first side of the dielectric layer. In addition, the patch antenna is connected to a signal output port.
Description
Title: A direct current energy supplying antenna structure
The invention relates to a direct current energy supplying antenna structure for converting radio frequency energy to direct current energy, comprising a micro strip patch antenna and a rectifier circuitry.
Such direct current energy supplying antenna structures are known for providing direct current energy to wireless mobile communication devices, thereby reducing the need for local energy suppliers, such as batteries.
In particular, a so-called rectenna is known wherein the micro strip patch antenna is connected to the rectifier circuitry.
However, an antenna that is connected to a rectifier cannot be used for communication purposes.
It is an object of the invention to provide a direct current energy supplying antenna structure according to the preamble, wherein the disadvantage identified above is reduced. In particular, the invention aims at obtaining a direct current energy supplying antenna structure according to the preamble wherein the antenna structure can be used for both providing direct current energy and wireless communicating. Thereto, according to the invention, the antenna structure further comprises a resistive element arranged in series with the rectifier circuitry, the resistive element and the rectifier circuitry forming an interconnection circuit and connecting a printed pattern near an edge of the micro strip patch on a first side of a dielectric layer to a ground plane on a second side, opposite to the first side of the dielectric layer, and wherein the patch antenna is connected to a signal output port.
By applying the rectifier circuitry in an electrically conducting path between the printed pattern on a first side of a dielectric layer and a ground plane on the second side of the dielectric layer, DC power can advantageously be retrieved from RF energy that is received by the antenna. Via the signal output port, wireless communication signals can be retrieved.
It is noted that an antenna structure comprising a resistive element connecting a printed pattern on a first side of a dielectric layer with a ground plane on a second, opposite to the first side of the dielectric layer near an edge of the strip patch, is known per se, see e.g. 'Broadband circularly polarised square microstrip antenna using chip -resistor loading' by C-Y. Huang a.o. in Antennas and Propagation, IEE Proceedings on Microwaves, 1999, page 94 sqq. Such lumped resistive connections of the printed pattern and a ground plane improve a bandwidth of the antenna and decrease a required antenna area, thus allowing miniaturization of micro strip patch antennas. The direct current energy supplying antenna structure according to the invention can advantageously be used for mobile communication devices, especially in low power wireless communication applications with reduced power sources, or in applications wherein the use of local power sources is even undesired or impossible. Examples of low power wireless communication applications are autonomous low poser low duty cycle sensors, such as a temperature sensor.
In a preferred embodiment the direct current energy supplying antenna structure further comprises an additional resistive element arranged in series with an additional rectifier circuitry, the additional resistive element and the additional rectifier circuitry forming an additional interconnection circuit and connecting a printed pattern near an additional edge of the micro strip patch on the first side of a dielectric layer with a ground plane on the second side of the dielectric layer, wherein the edge and the additional edge are oriented substantially transverse with respect to each other. In the preferred embodiment more DC energy can be obtained from RF waves as radio waves having different polarizations interact substantially with one or both rectifier circuitries.
Other advantageous embodiments according to the invention are described in the following claims.
By way of example only, an embodiments of the present invention will now be described with reference to the accompanying figures in which Fig. 1 shows a direct current energy supplying antenna structure according to the invention. The antenna structure 1 comprises a micro strip patch antenna 2 implemented in a planar structure. The antenna 2 is connected to an output port 9 serving as a signal output port for enabling wireless communication. The connection between the antenna and the output port is implemented as a transmission line segment that is realized in the same technology as the patch antenna. In principle, however, also other techniques are available, such as a coax cable.
The transmission line and the patch 2 are realized using micro strip technology. In doing so, a ground plate of a printed circuit board serves as the earth, while on the opposite side of the board an electrically conducting pattern is printed. It is noted, however, that also other techniques could be used, such as etching techniques. The printed circuit board has dielectric properties to electromagnetically couple the printed pattern and the ground plate. In particular, the transmission line segment is formed as printed tracks. The patch is formed as a rectangular plane section that is designated for optimal receipt and transmission of e.g. 2.45 GHz.
A first edge 3 of the patch 2 is connected via a rectifier circuitry 7 in series with a discrete resistive element 10 to an electrically conducting via 5 that is connected to the ground plane of the antenna structure 1. By using the resistive element 10 the bandwidth of the antenna is enlarged while sizes of the patch antenna 1 are kept small. The discrete resistive element 10 is assembled on the side of the printed circuit board on which the electrically conducting pattern is printed. Alternatively, the discrete resistive element 10 is arranged in the via 5 interconnecting both opposite surfaces of the printed circuit board. A second edge 4 being oriented substantially transverse with respect to the first edge 3, is similarly connected in series via a rectifier
circuitry 8 and a discrete resistive element 11 to an additional via 6 interconnecting both opposite surfaces of the printed circuit board.
The rectifier circuitries 7, 8 are e.g. implemented as a single diode component. However, also other rectifier circuitries 7, 8 are possible, such as a diode structure having two anti-parallel arranged diode components for improved gain of the direct current energy. The DC energy is retrieved by connecting to interconnection, output ports of the rectifier circuitries 7, 8 and can be fed to local energy buffers, such as a capacitor or a rechargeable battery. Any communication radio signal received by the patch 2 can be retrieved from the signal port 9.
The circuitries 7, 8 and the discrete resistors 10, 11 might be connected to the other components of the patch 2 using several techniques, such as soldering, gluing or otherwise to obtain an electrical conducting connection. Further, a more complex diode structure can be employed to further enhance a direct current energy retrieval from the received radio waves.
According to an aspect of the invention, the rectifier circuitry and the resistive element are arranged in series, forming an interconnecting circuit and connecting an edge of the printed pattern patch to the ground plane. In the shown embodiment, one port of the rectifier circuitry is connected to the patch edge. In this respect it is noted that the relative position of the rectifier circuitry and the resistive element in the interconnecting circuit can mutually be interchanged, so that a port of the resistive element is connected to the patch edge. The invention is not restricted to the embodiments described herein.
It will be understood that many variants are possible.
As an example, geometries of the antenna patches can also be designed for performing wireless communication using radio waves having other frequencies, e.g. more or less than 2.45 GHz.
In addition, in stead of using a discrete resistor in series with a rectifier circuitry, the resistor can be implemented integrally with a via structure interconnecting the printed pattern with the ground plane.
Further, optionally, an additional signal output port can be connected to an edge of the patch 2 in a substantially transverse orientation with respect to the earlier described signal output port 12, thereby enabling retrieval of mutually orthogonal oriented radio waves. Using micro strip technology, transmission line segments interconnecting the micro strip patch with the signal output ports, respectively, are oriented substantially mutually transversely and connected to the patch at edges that are oriented substantially mutually transversely.
Other such variants will be obvious for the person skilled in the art and are considered to lie within the scope of the invention as formulated in the following claims.
Claims
1. A direct current energy supplying antenna structure for converting radio frequency energy to direct current energy, comprising a micro strip patch antenna and a rectifier circuitry, wherein the antenna structure further comprises a resistive element arranged in series with the rectifier circuitry, the resistive element and the rectifier circuitry forming an interconnection circuit and connecting a printed pattern near an edge of the micro strip patch on a first side of a dielectric layer to a ground plane on a second side, opposite to the first side of the dielectric layer, and wherein the patch antenna is connected to a signal output port.
2. A direct current energy supplying antenna structure according to claim 1, wherein the rectifier comprises a single diode component.
3. A direct current energy supplying antenna structure according to claim 1, wherein the rectifier comprises two anti-parallel placed diode components.
4. A direct current energy supplying antenna structure according to any of the previous claims, further comprising an additional resistive element arranged in series with an additional rectifier circuitry, the additional resistive element and the additional rectifier circuitry forming an additional interconnection circuit and connecting a printed pattern near an additional edge of the micro strip patch on the first side of a dielectric layer with a ground plane on the second side of the dielectric layer, wherein the edge and the additional edge are oriented substantially transverse with respect to each other.
5. A direct current energy, further comprising an additional signal output port being connected to an edge of the patch 2 in a substantially transverse orientation with respect to the signal output port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP08723893A EP2132824A1 (en) | 2007-03-12 | 2008-03-12 | A direct current energy supplying antenna structure |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP07103007A EP1970994A1 (en) | 2007-03-12 | 2007-03-12 | A direct current energy supplying antenna structure |
| EP08723893A EP2132824A1 (en) | 2007-03-12 | 2008-03-12 | A direct current energy supplying antenna structure |
| PCT/NL2008/050142 WO2008111836A1 (en) | 2007-03-12 | 2008-03-12 | A direct current energy supplying antenna structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP2132824A1 true EP2132824A1 (en) | 2009-12-16 |
Family
ID=37907083
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP07103007A Withdrawn EP1970994A1 (en) | 2007-03-12 | 2007-03-12 | A direct current energy supplying antenna structure |
| EP08723893A Withdrawn EP2132824A1 (en) | 2007-03-12 | 2008-03-12 | A direct current energy supplying antenna structure |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP07103007A Withdrawn EP1970994A1 (en) | 2007-03-12 | 2007-03-12 | A direct current energy supplying antenna structure |
Country Status (2)
| Country | Link |
|---|---|
| EP (2) | EP1970994A1 (en) |
| WO (1) | WO2008111836A1 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS611102A (en) * | 1984-01-13 | 1986-01-07 | Japan Radio Co Ltd | Microstrip antenna circuit switching polarized wave |
| DE3628583C2 (en) * | 1986-08-22 | 1993-12-09 | Licentia Gmbh | Receiving device for microwave signals |
| JPH0636492B2 (en) * | 1989-04-03 | 1994-05-11 | 山武ハネウエル株式会社 | Microwave power receiver |
| JP3063513B2 (en) * | 1994-02-10 | 2000-07-12 | 松下電器産業株式会社 | Microwave detection feed circuit |
-
2007
- 2007-03-12 EP EP07103007A patent/EP1970994A1/en not_active Withdrawn
-
2008
- 2008-03-12 EP EP08723893A patent/EP2132824A1/en not_active Withdrawn
- 2008-03-12 WO PCT/NL2008/050142 patent/WO2008111836A1/en not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2008111836A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2008111836A1 (en) | 2008-09-18 |
| EP1970994A1 (en) | 2008-09-17 |
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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 |
|
| 17P | Request for examination filed |
Effective date: 20091005 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR |
|
| 17Q | First examination report despatched |
Effective date: 20100112 |
|
| DAX | Request for extension of the european patent (deleted) | ||
| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: NEDERLANDSE ORGANISATIE VOOR TOEGEPAST -NATUURWETE |
|
| 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: 20100526 |