EP1184934A1 - Antenne plane - Google Patents
Antenne plane Download PDFInfo
- Publication number
- EP1184934A1 EP1184934A1 EP01440211A EP01440211A EP1184934A1 EP 1184934 A1 EP1184934 A1 EP 1184934A1 EP 01440211 A EP01440211 A EP 01440211A EP 01440211 A EP01440211 A EP 01440211A EP 1184934 A1 EP1184934 A1 EP 1184934A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- printed circuit
- antenna
- quarter
- gamma
- radiating 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- Withdrawn
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
-
- 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
Definitions
- the present invention relates to a gamma feed antenna for radio frequency transceivers with components attached to a printed circuit.
- the antenna will be intended for radiocommunications in the automotive field, and will operate for transmissions to frequencies above 800 MHz, such as those by example used in GSM, DECT, ISM 868 MHz, blue standards tooth, etc ...
- the transmitters / receivers required must be small, their antenna must however obviously have the best possible performance in terms of gain and impedance matching.
- the antennas used must have a maximum efficiency in radiated energy, under a characteristic impedance equal in most case at 50 ⁇ .
- the antennas used in these applications operate in standing wave regime, with a radiating element comparable to a line quarter wave short-circuited at one of its ends to the circuit ground transmitter / receiver, a so-called gamma supply line connecting said circuit to a point of the quarter-wave line corresponding to an impedance of about 50 ⁇ .
- a radiating element comparable to a line quarter wave short-circuited at one of its ends to the circuit ground transmitter / receiver
- a so-called gamma supply line connecting said circuit to a point of the quarter-wave line corresponding to an impedance of about 50 ⁇ .
- Such quarter monopole antennas with gamma feed are well known in itself, but need to be adapted to the specific technical contexts in which they are used.
- the quarter-wave radiating element is used in association with an electronic circuit notably installed on a printed circuit.
- the particular problems to be solved are of several kinds, and aim not only to make an adaptation between the gamma supply line and the antenna aiming to transfer the maximum energy between the electronic circuit and the element quarter wave, but also to allow the simplest and least manufacturing expensive possible, and finally to obtain a minimum bulk.
- the antennas are consisting of a metal wire soldered to the printed circuit.
- the advantage of this configuration is that you can find antenna positions that reduce space, by folding, for example, the wire parallel to the printed circuit, or by soldering it to an edge of said circuit, said wire then being placed in the plane of the PCB support. A certain distance of air is then maintained between the active part of the antenna and the circuit, which allows the density control of the field lines, which must not be too close together so as not to decrease radiation from the antenna.
- the antenna is a track of a printed circuit, as for example described in document US-A-5 835 063.
- the radiating element then consists of a conductive track forming a portion of the conductive deposit of said printed circuit separated from its main part by a rectangular slot along the element beaming.
- the radiating element is supplied by a microstrip placed on the face of the support which does not include a conductive deposit, said microstrip crossing the above-mentioned slot in order to allow a double stub feeding.
- the idea on which the invention is based is to propose a configuration without welding, which takes advantage of the mass metal available in a printed circuit, and optimizes the circuit-antenna link, all with traditional materials to keep costs down of production at a level allowing to envisage an industrialization.
- the invention therefore relates precisely to a gamma feed antenna for radio frequency transmitter / receiver, the components of which are connected to a printed circuit comprising a track constituting a supply line connecting the radio transmitter / receiver at the antenna, which consists of a quarter-wave radiating element formed by a rectilinear metallic track of the circuit printed, said track being arranged on the edge of one side of the circuit support printed.
- This antenna is mainly characterized in that the track forming the quarter-wave radiating element is separated from the components by at least one cutting in the support of the printed circuit, along the track forming the quarter-wave radiating element, said cutout extending to the vicinity of the end of said element connected to the ground plane of the printed circuit.
- the printed circuit is at least double-sided, one side comprising the track forming the quarter-wave radiating element, the ground plane and the track forming the link between them, the other side comprising the circuit printed, on which the radiofrequency transmitter / receiver is installed, as well as the supply line of the quarter-wave radiating element whose connection to this the latter is carried out via a metallized orifice passing through the support of the printed circuit.
- This metallized hole configuration is very advantageous because the position of the radiating element with respect to the mass makes it possible to minimize the length of the adaptation link, in practice to the width of the cutout in the dielectric support of the printed circuit. This reduces the inductive impedance of the gamma matching bond, and makes it unnecessary the addition of a capacity which generally equips feeding antennas gamma.
- each conductive layer has a thickness of between 15 ⁇ m and 80 ⁇ m.
- the gamma jack of the invention works as indicated with an element radiating quarter wave.
- the length of this last is, of course, related to the frequency of use, and therefore at the emission / reception wavelength.
- the frequency domain used is that of the DECT band centered around 1880 MHz, hence an easy calculation of the order of magnitude of the length of the radiating element (see below).
- the length of the quarter-wave radiating element is between 0.9 ⁇ / 4 and 5 ⁇ / 8.
- the cut made in the support of the printed circuit is rectangular, with a width of at least 2 mm and a length at least three-quarters of the quarter-wave element, from the free end of the latter marking the start of cutting.
- This value is, of course, relating to a particular printed circuit, operating with transmission / reception according to the DECT standard, including the central wavelength (corresponding to 1880 MHz of frequency) is approximately 16 cm, which gives an element radiating quarter wave about 4 cm long. In the configuration of the invention, this means that the rectangular-shaped printed circuit has a width approximately 4 cm for a slightly longer length.
- the width of the cut is taken to be at least ⁇ / 50.
- the cut made in the support of the circuit printed is discontinuous, and formed of a succession of orifices made in the support.
- the orifices are shaped circular.
- the width of the quarter-wave radiating element is between ⁇ / 10 and ⁇ / 40. Tests have shown that a planar antenna in the form of a track printed circuit board allows optimum performance radiation with these widths.
- the quarter-wave radiating element has a length of 33 mm, a width of 4.5 mm, the cut in the support of the printed circuit having a width 2.5 mm.
- the gamma-feed quarter-wave radiating element antenna of the invention operates in regime standing waves along said radiating element (1).
- This element (1) is connected to ground (2) at its lower end, point where the high voltage frequency is therefore zero, while it is maximum at its end free.
- the current is quadrature, that is to say zero at the free end and maximum at the point of contact with the ground plane (2) which is the repository for food of the antenna.
- the impedance varies along the radiating element: it is weak and close to 0 ⁇ at the connection to the mass (2), and high at the free end of the radiating element (1), of the order of thousand Ohms.
- Adaptation consists in adjusting the impedance by displacement along the radiating element (1) of the socket (3) until the desired value is obtained, around 50 ⁇ .
- the conductive element (4) located between said power outlet (3) and the connection terminals (5) gives its name to the designation (in gamma) of the makes the shape it takes.
- R being the real resistive part adjustable by positioning of the socket (3), then that X is the reactive part, of an inductive nature, originating from said bond in gamma (4).
- a capacitor (6) is inserted between said link (4) and the terminals (5), which cancels the imaginary jX part to give a purely impedance real.
- FIG. 2 represents the configuration of a printed circuit support according to the invention, provided with a cutout (7) separating the tab (8) supporting the track forming the quarter-wave radiating element of the surface (9) supporting the circuit transmission / reception electronics (not shown). All of these are located in the same plane, which results in a considerable reduction in the size of the transmitter / receiver.
- the cutout (7) introducing air between the antenna arranged on the tab (8) and the circuit makes it possible to make the characteristics of the antenna independent of variations in the dielectric constant of the material forming the circuit support printed.
- FIG. 3 shows one side of the printed circuit, the black surface corresponding to the metallized coating forming the ground plane (10) on the one hand, and the quarter-wave element (11) on the other hand.
- the dielectric material support (12) comprises said cutout (7) which runs along approximately three quarters of the radiating element (11) which covers the tab (8).
- the ground plan (10) covers almost all of the surface (9).
- a metallized through hole (13) makes the electrical connection between the element radiating quarter wave (11) and the gamma bond (see Figure 4) and constitutes the socket (3) of figure 1.
- the second opposite side of the circuit support printed is shown, showing in its right part, in dotted lines, the tracks of the opposite face, and in particular the track (11) constituting the quarter element wave.
- the tracks of the printed circuit receiving in particular the transmitter / receiver do not are not accurately figured. In any case, they depend on components used, and are shown diagrammatically by the crossed-out rectangle.
- the through hole (13) metallized constituting the power outlet is located at the end of the link (14) in gamma constituting the antenna supply line.
- the width of the supply line (14) is determined according to the characteristic impedance of the transmitter / receiver input and high frequency characteristics of the printed circuit. As mentioned previously, this impedance is preferably close to 50 ⁇ .
- One of the major advantages of this structure is that the length of the element gamma (14) is reduced to the width of the cutout (7) resulting in a reduction of the inductive impedance of this adaptation element (14) which makes it possible to do without the addition of a capacity in series in the circuit.
- the antenna of this invention is grounded from the point of view of low frequencies and direct current. This feature has the effect of protect the electronic components of the radio part against discharges electrostatic on the end of the antenna.
- the arrangement of this antenna on the edge of the printed circuit also has the advantage of allowing the production of a product comprising the transmitter / receiver, the antenna and in addition all interface functions for the user such as a display, a keyboard, an audible signal etc ...
- This same arrangement of the antenna on the printed circuit makes it possible to focus the electromagnetic energy of the antenna in a preferred direction, which can prove to be advantageous for products laptops that should fit in the palm of your hand.
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- Details Of Aerials (AREA)
Abstract
Description
- augmentation du temps de fabrication ; et par conséquent
- augmentation du coût de production ;
- existence d'une faiblesse potentielle au niveau de la soudure, qui est une liaison dont la qualité mécanique n'est jamais assurée, ni d'ailleurs la pérennité.
- la figure 1 est un schéma théorique d'une liaison d'adaptation gamma à un élément rayonnant quart d'onde ;
- la figure 2 illustre la configuration d'un support de circuit imprimé comportant une antenne selon l'invention ;
- la figure 3 montre un côté du support de circuit imprimé ; et
- la figure 4 en représente l'autre côté.
- Fréquence centrale 1888 GHz
- Taux d'onde stationnaire inférieur à 2 pour une bande passante de -40 à +80 MHz autour de 1888 GHz.
- Performances radioélectriques équivalentes à une antenne quart d'onde.
Claims (12)
- Antenne à alimentation gamma pour émetteur/récepteur radiofréquences, dont les composants sont connectés à un circuit imprimé comportant une piste constituant une ligne d'alimentation reliant l'émetteur/récepteur radiofréquences à l'antenne, laquelle est constituée d'un élément rayonnant quart d'onde formée d'une piste rectiligne métallique du circuit imprimé, ladite piste étant disposée en bordure d'un côté du support du circuit imprimé, caractérisée en ce que la piste formant l'élément rayonnant quart d'onde est séparée des composants par au moins une découpe pratiquée dans le support du circuit imprimé, le long de la piste formant l'élément rayonnant quart d'onde, ladite découpe s'étendant jusqu'au voisinage de l'extrémité dudit élément reliée au plan de masse du circuit imprimé.
- Antenne à alimentation gamma pour émetteur/récepteur radiofréquences selon la revendication précédente, caractérisée en ce que le circuit imprimé est au moins double face, une face comportant la piste formant l'élément rayonnant quart d'onde, le plan de masse et la piste formant la liaison entre ces derniers, l'autre face comportant le circuit imprimé sur lequel est implanté l'émetteur/récepteur radiofréquences, ainsi que la ligne d'alimentation de l'élément rayonnant quart d'onde, reliée à cette dernière via un orifice métallisé traversant le support du circuit imprimé.
- Antenne à alimentation gamma pour émetteur/récepteur radiofréquences selon l'une des revendications précédentes, caractérisée en ce que le support du circuit imprimé présente une constante diélectrique comprise entre 3 et 10.
- Antenne à alimentation gamma pour émetteur/récepteur radiofréquences selon la revendication précédente, caractérisée en ce que chaque couche conductrice présente une épaisseur comprise entre 15 µm et 80 µm.
- Antenne à alimentation gamma pour émetteur/récepteur radiofréquences selon l'une quelconque des revendications précédentes, caractérisée en ce que la longueur de l'élément rayonnant quart d'onde est comprise entre 0,9 x λ/4 et 5λ/8.
- Antenne à alimentation gamma pour émetteur/récepteur radiofréquences selon l'une quelconque des revendications 2 à 5, caractérisée en ce que le plan de masse du circuit imprimé auquel sont fixés les composants de l'émetteur/récepteur radiofréquences est le même que celui auquel est relié l'élément rayonnant quart d'onde.
- Antenne à alimentation gamma pour émetteur/récepteur radiofréquences selon l'une quelconque des revendications précédentes, caractérisée en ce que la découpe pratiquée dans le support du circuit imprimé est rectangulaire, avec une largeur d'au moins 2 mm et une longueur d'au moins les trois quarts de l'élément quart d'onde, à partir de l'extrémité libre de ce dernier marquant le début de la découpe.
- Antenne à alimentation gamma pour émetteur/récepteur radiofréquences selon l'une quelconque des revendications 1 à 6, caractérisée en ce que la largeur de la découpe est égale à au moins λ/50.
- Antenne à alimentation gamma pour émetteur/récepteur radiofréquences selon l'une quelconque des revendications 1 à 6, caractérisée en ce que la découpe est discontinue, et formée d'une succession d'orifices pratiqués dans le support.
- Antenne à alimentation gamma pour émetteur/récepteur radiofréquences selon la revendication précédente, caractérisée en ce que les orifices sont d'allure circulaire.
- Antenne à alimentation gamma pour émetteur/récepteur radiofréquences selon l'une quelconque des revendications précédentes, caractérisée en ce que la largeur de l'élément rayonnant quart d'onde est comprise entre λ/10 et λ/40.
- Antenne à alimentation gamma pour émetteur/récepteur radiofréquences selon l'une quelconque des revendications précédentes, caractérisée en ce que l'élément rayonnant quart d'onde présente une longueur de 33 mm, une largeur de 4,5 mm, la découpe dans le support du circuit imprimé ayant une largeur de 2,5 mm.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0008728A FR2811478A1 (fr) | 2000-07-05 | 2000-07-05 | Antenne plane a alimentation gamma |
FR0008728 | 2000-07-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1184934A1 true EP1184934A1 (fr) | 2002-03-06 |
Family
ID=8852121
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01440211A Withdrawn EP1184934A1 (fr) | 2000-07-05 | 2001-07-05 | Antenne plane |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1184934A1 (fr) |
FR (1) | FR2811478A1 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102655267A (zh) * | 2011-03-03 | 2012-09-05 | Nxp股份有限公司 | 多频带天线 |
WO2018184369A1 (fr) * | 2017-04-07 | 2018-10-11 | 深圳市景程信息科技有限公司 | Antenne unipolaire bimode miniaturisée reconfigurable en forme de hache |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4746923A (en) * | 1982-05-17 | 1988-05-24 | The Singer Company | Gamma feed microstrip antenna |
WO1998027609A1 (fr) * | 1996-12-18 | 1998-06-25 | Raytheon Company | Petite antenne a fente, omnidirectionnelle |
US5835063A (en) * | 1994-11-22 | 1998-11-10 | France Telecom | Monopole wideband antenna in uniplanar printed circuit technology, and transmission and/or recreption device incorporating such an antenna |
DE29901255U1 (de) * | 1999-01-26 | 1999-06-24 | Stansch jun., Gerhard, 48155 Münster | Vollgespeiste Ganzwellen-Richtantenne mit zweifacher Gamma-Anpassung und Koaxial-Kabel als Phasenleitung |
-
2000
- 2000-07-05 FR FR0008728A patent/FR2811478A1/fr not_active Withdrawn
-
2001
- 2001-07-05 EP EP01440211A patent/EP1184934A1/fr not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4746923A (en) * | 1982-05-17 | 1988-05-24 | The Singer Company | Gamma feed microstrip antenna |
US5835063A (en) * | 1994-11-22 | 1998-11-10 | France Telecom | Monopole wideband antenna in uniplanar printed circuit technology, and transmission and/or recreption device incorporating such an antenna |
WO1998027609A1 (fr) * | 1996-12-18 | 1998-06-25 | Raytheon Company | Petite antenne a fente, omnidirectionnelle |
DE29901255U1 (de) * | 1999-01-26 | 1999-06-24 | Stansch jun., Gerhard, 48155 Münster | Vollgespeiste Ganzwellen-Richtantenne mit zweifacher Gamma-Anpassung und Koaxial-Kabel als Phasenleitung |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102655267A (zh) * | 2011-03-03 | 2012-09-05 | Nxp股份有限公司 | 多频带天线 |
US9190719B2 (en) | 2011-03-03 | 2015-11-17 | Nxp B.V. | Multiband antenna |
WO2018184369A1 (fr) * | 2017-04-07 | 2018-10-11 | 深圳市景程信息科技有限公司 | Antenne unipolaire bimode miniaturisée reconfigurable en forme de hache |
Also Published As
Publication number | Publication date |
---|---|
FR2811478A1 (fr) | 2002-01-11 |
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