EP0550320B1 - Waveguide with non-inclined slots activated by metallic inserts - Google Patents
Waveguide with non-inclined slots activated by metallic inserts Download PDFInfo
- Publication number
- EP0550320B1 EP0550320B1 EP92403491A EP92403491A EP0550320B1 EP 0550320 B1 EP0550320 B1 EP 0550320B1 EP 92403491 A EP92403491 A EP 92403491A EP 92403491 A EP92403491 A EP 92403491A EP 0550320 B1 EP0550320 B1 EP 0550320B1
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- EP
- European Patent Office
- Prior art keywords
- waveguide
- slots
- flaps
- guide
- slot
- 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.)
- Expired - Lifetime
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
- H01Q21/0037—Particular feeding systems linear waveguide fed arrays
- H01Q21/0043—Slotted waveguides
Definitions
- the present invention relates to a guide with non-inclined radiating slots of the type comprising slots perpendicular to the axis of the guide, cut on a small side of the guide with a spacing substantially but not exactly equal to a half wavelength of operation in the guide, and means for exciting each of these slots.
- Slotted guides are frequently used as linear arrays of radiating sources in array antennas, for example in radar. Their advantages are low cost and low losses. To obtain a radiation close to normal to the guide and a good adaptation, it is necessary on the one hand a distance between successive slits close to ⁇ g / 2, where ⁇ g is the wavelength in the guide, and on the other hand an additional phase shift of ⁇ between two consecutive slots.
- slots arranged on the long side of a rectangular section guide or on the short side have several drawbacks and in particular a large pitch between successive guides, which limits the scanning angle of the beam in a plane perpendicular to the guides. We therefore prefer to use slots on the short side of the guides.
- a first solution therefore consists in tilting the slots alternately on one side and on the other to obtain the necessary conditions specified above.
- this solution has the drawback, due to the inclination of the slits, of radiating a cross-polarized component which can reach levels incompatible with proper functioning of the antenna using these guides.
- Another known solution then consists in using non-inclined slots (perpendicular to the axis of the guide) and in exciting them by means of an obstacle placed in the guide (iris, stems).
- US Patent 4,435,715 (Hughes Aircraft) describes a guide with non-inclined slits in which the excitation of a slit is obtained by placing conductive rods on either side of the slit. Each rod is arranged between an edge of the slot and one of the long sides of the guide.
- a solution has the drawback of being costly to produce. Indeed, it is necessary to individually fix the rods inside the guide, for example by welding in a bath.
- the use of rods has significant drawbacks from the microwave point of view. Indeed, this solution has a certain frequency selectivity, hence a limited bandwidth and a relatively unsatisfactory standing wave rate (TOS).
- TOS standing wave rate
- the coupling by rods involves the use of relatively wide slots, hence a residual level of cross-polarization which can be troublesome for certain applications.
- the invention relates to a slotted guide overcomes these drawbacks through the use of metal shutters to excite each slot.
- a guide with non-inclined radiating slots of the type comprising slots perpendicular to the axis of the guide, cut on a small side of the guide with a spacing substantially but not exactly equal to half a length d operating wave in the guide, and means for excitation of each of these slots, characterized in that said excitation means consist of at least one metal flap inserted in the guide along a long side of the guide and of said short side carrying the slots, in a position adjacent to the associated slot and extending in a plane parallel to that of the slot.
- Figures 1 and 2 show a waveguide 1 comprising, cut on the short side, radiating slots 2, 3 not inclined, that is to say perpendicular to the longitudinal axis of the guide. As already mentioned, such slots are normally not coupled to the energy propagating in the guide 1 and therefore do not radiate.
- flaps 21, 22, 31, 32 are here of triangular shape. They are arranged and welded into mounting slots cut in the guide and of adequate depth, perpendicular to the walls of the guide.
- the flaps are associated with the slots 2, 3 in pairs, respectively 21-22, 31-32 and arranged adjacent to the associated slots and on either side thereof.
- Each flap is located in the guide against the short side carrying the slots and one of the long sides of the guide.
- the radiating slits are spaced apart by a pitch substantially equal to ⁇ g / 2, where ⁇ g is the wavelength of operation in the guide.
- ⁇ g is the wavelength of operation in the guide.
- the metal shutters are all cut to form similar right triangles whatever their size and therefore have the same angle ⁇ .
- This has been symbolized in FIG. 1 by showing in dotted lines a larger flap 21 ′ with the same angle ⁇ .
- the advantage of such a characteristic is that, during manufacture, all of the shutter mounting slots can be obtained by orienting the guide by rotation about its axis by a given fixed angle relative to the machine tool. .
- the angle ⁇ is chosen to obtain an optimum adaptation in the guide and can, for example, be of the order of 30 °.
- the metal shutters constitute obstacles in the guide and necessarily produce reflections of part of the energy which propagates there. It is clear that, when the spacing between homologous components is equal to ⁇ g / 2, the reflected energies are added and there is a sharp degradation of the TOS. When it is desired to operate in a given frequency band, it is therefore necessary to provide the guide with a spacing of the radiating slots such that, either this spacing is less than ⁇ g / 2 for all the frequencies of the band, or else it is greater than ⁇ g / 2 for all band frequencies. In practice, the first solution is preferred, because when the spacing is greater than ⁇ g / 2, there is a risk of seeing annoying lobes of the network appear.
- the coupling of a radiating slit is adjustable by the size of the flaps and by their spacing at the slit.
- One of the great advantages of metal shutters is that they can be placed right at the edge of the radiating slots (unlike the rods) and that it is in this position that the widest bandwidth is obtained.
- the metal shutters are less selective than, for example, rods or irises. We therefore obtain a wider bandwidth and a better TOS.
- a major advantage is that, in addition, it has been found that, with metal shutters as excitation devices, the radiating slots used could be much narrower, up to 50% narrower. However, this is essential for the performance of a rectilinearly polarized antenna using such slot guides since this results in a significant reduction in cross polarization.
Description
La présente invention se rapporte à un guide à fentes rayonnantes non inclinées du type comportant des fentes perpendiculaires à l'axe du guide, découpées sur un petit côté du guide avec un espacement sensiblement mais non exactement égal à une demi-longueur d'onde de fonctionnement dans le guide, et des moyens d'excitation de chacune de ces fentes.The present invention relates to a guide with non-inclined radiating slots of the type comprising slots perpendicular to the axis of the guide, cut on a small side of the guide with a spacing substantially but not exactly equal to a half wavelength of operation in the guide, and means for exciting each of these slots.
Les guides à fentes sont fréquemment utilisés comme réseaux linéaires de sources rayonnantes dans des antennes réseaux, par exemple en radar. Ils ont pour avantages un faible coût et des pertes faibles. Pour obtenir un rayonnement voisin de la normale au guide et une bonne adaptation, il faut d'une part une distance entre fentes successives voisine de λ g/2, où λg est la longueur d'onde dans le guide, et d'autre part un déphasage supplémentaire de π entre deux fentes consécutives.Slotted guides are frequently used as linear arrays of radiating sources in array antennas, for example in radar. Their advantages are low cost and low losses. To obtain a radiation close to normal to the guide and a good adaptation, it is necessary on the one hand a distance between successive slits close to λ g / 2, where λg is the wavelength in the guide, and on the other hand an additional phase shift of π between two consecutive slots.
On peut remplir ces conditions avec des fentes disposées sur le grand côté d'un guide de section rectangulaire ou sur le petit côté . Les fentes sur le grand côté ont plusieurs inconvénients et notamment un pas important entre guides successifs, ce qui limite l'angle de balayage du faisceau dans un plan perpendiculaire aux guides. On préfère donc utiliser des fentes sur le petit côté des guides.These conditions can be fulfilled with slots arranged on the long side of a rectangular section guide or on the short side. The slots on the long side have several drawbacks and in particular a large pitch between successive guides, which limits the scanning angle of the beam in a plane perpendicular to the guides. We therefore prefer to use slots on the short side of the guides.
Si les fentes sont perpendiculaires à l'axe du guide, il n'y a pas couplage d'énergie entre les fentes et le guide et le rayonnement est nul.If the slots are perpendicular to the axis of the guide, there is no energy coupling between the slots and the guide and the radiation is zero.
Une première solution consiste donc à incliner les fentes alternativement d'un côté et de l'autre pour obtenir les conditions nécessaires spécifiées précédemment. Cependant cette solution a l'inconvénient, du fait de l'inclinaison des fentes, de rayonner une composante en polarisation croisée qui peut atteindre des niveaux incompatibles avec un bon fonctionnement de l'antenne utilisant ces guides.A first solution therefore consists in tilting the slots alternately on one side and on the other to obtain the necessary conditions specified above. However, this solution has the drawback, due to the inclination of the slits, of radiating a cross-polarized component which can reach levels incompatible with proper functioning of the antenna using these guides.
Une autre solution connue consiste alors à utiliser des fentes non inclinées (perpendiculaires à l'axe du guide) et à les exciter au moyen d'un obstacle disposé dans le guide (iris, tiges).Another known solution then consists in using non-inclined slots (perpendicular to the axis of the guide) and in exciting them by means of an obstacle placed in the guide (iris, stems).
En particulier, le brevet américain US 4 435 715 (Hughes Aircraft) décrit un guide à fentes non inclinées dans lequel l'excitation d'une fente est obtenue en disposant des tiges conductrices de part et d'autre de la fente. Chaque tige est disposée entre un bord de la fente et un des grands côtés du guide. Cependant une telle solution a l'inconvénient d'être coûteuse à réaliser. En effet, il est nécessaire de fixer individuellement les tiges à l'intérieur du guide, par exemple par soudure au bain. D'autre part, l'utilisation de tiges a des inconvénients notables du point de vue hyperfréquences. En effet, cette solution présente une certaine sélectivité en fréquence, d'où une bande passante limitée et un taux d'ondes stationnaires (TOS) relativement peu satisfaisant. Par ailleurs, le couplage par tiges entraîne l'utilisation de fentes relativement larges, d'où un niveau de polarisation croisée résiduel qui peut être gênant pour certaines applications.In particular, US Patent 4,435,715 (Hughes Aircraft) describes a guide with non-inclined slits in which the excitation of a slit is obtained by placing conductive rods on either side of the slit. Each rod is arranged between an edge of the slot and one of the long sides of the guide. However, such a solution has the drawback of being costly to produce. Indeed, it is necessary to individually fix the rods inside the guide, for example by welding in a bath. On the other hand, the use of rods has significant drawbacks from the microwave point of view. Indeed, this solution has a certain frequency selectivity, hence a limited bandwidth and a relatively unsatisfactory standing wave rate (TOS). Furthermore, the coupling by rods involves the use of relatively wide slots, hence a residual level of cross-polarization which can be troublesome for certain applications.
L'invention a pour objet un guide à fentes remédiant à ces inconvénients grâce à l'utilisation de volets métalliques pour exciter chaque fente.The invention relates to a slotted guide overcomes these drawbacks through the use of metal shutters to excite each slot.
Selon l'invention, il est donc prévu un guide à fentes rayonnantes non inclinées du type comportant des fentes perpendiculaires à l'axe du guide, découpées sur un petit côté du guide avec un espacement sensiblement mais non exactement égal à une demi-longueur d'onde de fonctionnement dans le guide, et des moyens d'excitation de chacune de ces fentes, caractérisé en ce que lesdits moyens d'excitation sont constitués par au moins un volet métallique inséré dans le guide le long d'un grand côté du guide et dudit petit côté portant les fentes, dans une position adjacente à la fente associée et s'étendant dans un plan parallèle à celui de la fente.According to the invention, there is therefore provided a guide with non-inclined radiating slots of the type comprising slots perpendicular to the axis of the guide, cut on a small side of the guide with a spacing substantially but not exactly equal to half a length d operating wave in the guide, and means for excitation of each of these slots, characterized in that said excitation means consist of at least one metal flap inserted in the guide along a long side of the guide and of said short side carrying the slots, in a position adjacent to the associated slot and extending in a plane parallel to that of the slot.
L'invention sera mieux comprise et d'autres caractéristiques et avantages apparaîtront à l'aide de la description ci-après et des dessins joints où :
- la figure 1 représente, vu en perspective, un guide à fentes selon l'invention, et
- la figure 2 représente le guide de la figure 1 vu de face, côté fentes rayonnantes.
- FIG. 1 represents, in perspective, a slotted guide according to the invention, and
- 2 shows the guide of Figure 1 seen from the front, radiating slots side.
Sur les figures, les mêmes éléments sont désignés par les mêmes numéros de référence.In the figures, the same elements are designated by the same reference numbers.
Les figures 1 et 2 représentent un guide d'ondes 1 comportant, découpées sur le petit côté, des fentes rayonnantes 2, 3 non inclinées, c'est-à-dire perpendiculaires à l'axe longitudinal du guide. Ainsi qu'on l'a déjà mentionné, de telles fentes ne sont normalement pas couplées à l'énergie se propageant dans le guide 1 et ne rayonnent donc pas.Figures 1 and 2 show a
Selon l'invention, on prévoit d'insérer dans le guide des volets métalliques 21, 22, 31, 32. Ces volets sont ici de forme triangulaire. Ils sont disposés et soudés dans des fentes de montage découpées dans le guide et de profondeur adéquate, perpendiculairement aux parois du guide. Les volets sont associés aux fentes 2, 3 par paires, respectivement 21-22, 31-32 et disposés adjacents aux fentes associées et de part et d'autre de celles-ci.According to the invention, provision is made to insert
Chaque volet est situé dans le guide contre le petit côté portant les fentes et un des grands côtés du guide.Each flap is located in the guide against the short side carrying the slots and one of the long sides of the guide.
Ces volets ont pour effet de modifier le champ électrique au niveau de la fente et ainsi de l'exciter.These shutters have the effect of modifying the electric field at the level of the slot and thus of exciting it.
La valeur du couplage peut être réglée de deux manières :
- en modifiant les dimensions des volets ;
- en réglant leur position par rapport à la fente rayonnante, c'est-à-dire en réglant la distance de leur plan par rapport à la fente associée.
- by modifying the dimensions of the flaps;
- by adjusting their position relative to the radiating slot, that is to say by adjusting the distance of their plane from the associated slot.
Les fentes rayonnantes sont espacées entre elles d'un pas sensiblement égal à λg/2, où λg est la longueur d'onde de fonctionnement dans le guide. On précisera ultérieurement comment se fait en pratique le choix de cet espacement. Du fait de ce dernier, il est nécessaire de fournir un déphasage additionnel de π entre deux fentes rayonnantes consécutives. Ce déphasage est obtenu en inversant les positions des volets de part et d'autre de la fente dans les paires consécutives. Ainsi sur les figures 1 et 2, la position des volets 31 et 32 est inversée par rapport à celle des volets 21 et 22. Les volets associés à une fente 31, 32 par exemple sont symétriques par rapport à l'axe central XX' de la fente, c'est-à-dire l'axe normal au petit côté du guide portant les fentes passant au centre P de la fente.The radiating slits are spaced apart by a pitch substantially equal to λg / 2, where λg is the wavelength of operation in the guide. We will specify later how the choice of this spacing is made in practice. Because of the latter, it is necessary to provide an additional phase shift of π between two consecutive radiating slots. This phase shift is obtained by reversing the positions of the flaps on either side of the slot in the consecutive pairs. Thus in FIGS. 1 and 2, the position of the
De préférence, les volets métalliques sont tous découpés pour former des triangles rectangles semblables quelque soit leur taille et présentent donc le même angle α. Ceci a été symbolisé sur la figure 1 en représentant en pointillé un volet de plus grande taille 21' de même angle α. L'avantage d'une telle caractéristique est que, à la fabrication, toutes les fentes de montage des volets peuvent être obtenues en orientant le guide par une rotation autour de son axe d'un angle donné fixe par rapport à la machine d'usinage.Preferably, the metal shutters are all cut to form similar right triangles whatever their size and therefore have the same angle α . This has been symbolized in FIG. 1 by showing in dotted lines a
L'angle α est choisi pour obtenir une adaptation optimum dans le guide et peut, par exemple, être de l'ordre de 30°. Un avantage de l'utilisation de volets est que l'on peut avoir un volet de faible taille pour un couplage faible tout en permettant un montage simple et mécaniquement précis et fiable.The angle α is chosen to obtain an optimum adaptation in the guide and can, for example, be of the order of 30 °. An advantage of the use of shutters is that one can have a small shutter for a weak coupling while allowing a simple and mechanically precise and reliable assembly.
Comme on peut le voir, les volets métalliques constituent des obstacles dans le guide et produisent nécessairement des réflexions d'une partie de l'énergie qui s'y propage. Il est clair que, lorsque l'espacement entre volets homologues est égal à λg/2, les énergies réfléchies s'ajoutent et on aboutit à une forte dégradation du TOS. Lorsque l'on veut fonctionner dans une bande de fréquences donnée, il faut donc prévoir le guide avec un espacement des fentes rayonnantes tel que, ou bien cet espacement est inférieur à λg/2 pour toutes les fréquences de la bande, ou bien il est supérieur à λg/2 pour toutes les fréquences de la bande. Dans la pratique, on préfère la première solution, car lorsque l'espacement est supérieur à λg/2, on risque de voir apparaître des lobes de réseau gênants.As can be seen, the metal shutters constitute obstacles in the guide and necessarily produce reflections of part of the energy which propagates there. It is clear that, when the spacing between homologous components is equal to λg / 2, the reflected energies are added and there is a sharp degradation of the TOS. When it is desired to operate in a given frequency band, it is therefore necessary to provide the guide with a spacing of the radiating slots such that, either this spacing is less than λg / 2 for all the frequencies of the band, or else it is greater than λg / 2 for all band frequencies. In practice, the first solution is preferred, because when the spacing is greater than λg / 2, there is a risk of seeing annoying lobes of the network appear.
Comme on l'a indiqué plus haut, le couplage d'une fente rayonnante est réglable par la taille des volets et par leur espacement à la fente. Un des grands avantages des volets métalliques est qu'ils peuvent être disposés tout au bord des fentes rayonnantes (contrairement aux tiges) et que c'est dans cette position qu'on obtient la bande passante la plus large.As indicated above, the coupling of a radiating slit is adjustable by the size of the flaps and by their spacing at the slit. One of the great advantages of metal shutters is that they can be placed right at the edge of the radiating slots (unlike the rods) and that it is in this position that the widest bandwidth is obtained.
Naturellement, dans le cas d'un réseau comprenant un nombre important de fentes, il est difficilement envisageable industriellement de prévoir autant de tailles de volets que de fentes sur un guide. Ainsi, on détermine un nombre donné de tailles différentes pour les volets et on complète le réglage des couplages en modifiant les espacements entre volets et fentes correspondantes. Ce compromis permet de conserver une bande passante suffisamment large tout en conduisant à une fabrication optimisée.Naturally, in the case of a network comprising a large number of slots, it is difficult to envisage industrially to provide as many sizes of flaps as there are slots on a guide. Thus, a given number of different sizes is determined for the flaps and the adjustment of the couplings is completed by modifying the spacings between flaps and corresponding slots. This compromise makes it possible to conserve a sufficiently wide passband while leading to optimized manufacturing.
Du point de vue électrique en hyperfréquences, les volets métalliques sont moins sélectifs que par exemple des tiges ou iris. On obtient donc une bande passante plus large et un meilleur TOS. Mais un avantage majeur est qu'en outre on a constaté que, avec des volets métalliques comme dispositifs d'excitation, les fentes rayonnantes utilisées pouvaient être beaucoup plus étroites, jusqu'à 50% moins larges. Or, ceci est essentiel pour les performances d'une antenne à polarisation rectiligne utilisant de tels guides à fentes car il en résulte une diminution notable de la polarisation croisée.From the microwave electrical point of view, the metal shutters are less selective than, for example, rods or irises. We therefore obtain a wider bandwidth and a better TOS. However, a major advantage is that, in addition, it has been found that, with metal shutters as excitation devices, the radiating slots used could be much narrower, up to 50% narrower. However, this is essential for the performance of a rectilinearly polarized antenna using such slot guides since this results in a significant reduction in cross polarization.
Bien entendu, les exemples de réalisation décrits ne sont nullement limitatifs de l'invention. En particulier, on pourrait n'utiliser qu'un seul volet d'excitation par fente (par exemple les volets 21 et 32 ou 22 et 31) bien que les performances soient un peu moins bonnes. De même, la forme des volets n'est pas critique et l'on pourrait aussi utiliser par exemple des volets de forme rectangulaire ou arrondie.Of course, the embodiments described are in no way limitative of the invention. In particular, it would be possible to use only one excitation flap per slot (for
Claims (6)
- Waveguide with non-inclined radiating slots of the type including slots perpendicular to the axis of the waveguide, cut out on a narrow wall of the waveguide with a spacing substantially but not exactly equal to a half wavelength of operation in the waveguide, and means for exciting each of these slots, characterized in that the said excitation means consist of at least one metal flap (21, 22, 31, 32) inserted into the waveguide along a broad wall of the waveguide and the said narrow wall bearing the slots, in a position adjacent to the associated slot, and extending in a plane perpendicular to the walls of the waveguide.
- Slotted waveguide according to Claim 1, characterized in that the said excitation means comprise, for each slot, two metal flaps (21, 22; 31, 32) which are symmetric with respect to the central axis (P) of the associated slot, their relative positioning being reversed from one slot to the next.
- Slotted waveguide according to one of Claims 1 and 2, characterized in that the said flaps are triangular in shape.
- Slotted waveguide according to any one of Claims 1 to 3, characterized in that the size of the said flaps inside the waveguide is determined by the coupling to be achieved between the wave propagated in the waveguide and the associated slot and in that the said flaps all have the shape of similar triangles.
- Slotted waveguide according to Claim 4, characterized in that the said waveguide includes mounting slots, the plane of which is perpendicular to the walls of the waveguide, the said mounting slots being cut out with the same machining angle to enable the insertion of the said flaps into the said waveguide.
- Slotted waveguide according to any one of Claims 1 to 5, characterized in that the distance between the plane of a flap and the associated slot and the size of the said flap are determined as a function of the coupling to be achieved between the wave propagated in the waveguide and the associated slot.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9116384 | 1991-12-21 | ||
| FR9116384A FR2685820B1 (en) | 1991-12-31 | 1991-12-31 | GUIDE TO RADIANT SLOTS NOT INCLINED EXCITED BY METAL SHUTTERS. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0550320A1 EP0550320A1 (en) | 1993-07-07 |
| EP0550320B1 true EP0550320B1 (en) | 1996-11-13 |
Family
ID=9420705
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP92403491A Expired - Lifetime EP0550320B1 (en) | 1991-12-31 | 1992-12-21 | Waveguide with non-inclined slots activated by metallic inserts |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5422652A (en) |
| EP (1) | EP0550320B1 (en) |
| CA (1) | CA2085453A1 (en) |
| DE (1) | DE69215202T2 (en) |
| FR (1) | FR2685820B1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3336733B2 (en) * | 1994-04-07 | 2002-10-21 | 株式会社村田製作所 | Communication module for transportation |
| CN103326125B (en) * | 2013-06-29 | 2015-02-25 | 中国人民解放军国防科学技术大学 | One-dimensional waveguide narrow slot antenna capable of scanning |
| WO2019211908A1 (en) * | 2018-05-02 | 2019-11-07 | 三菱電機株式会社 | Waveguide slot array antenna |
| WO2023117427A1 (en) | 2021-12-23 | 2023-06-29 | Huber+Suhner Ag | Antenna device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2574433A (en) * | 1943-10-01 | 1951-11-06 | Roger E Clapp | System for directional interchange of energy between wave guides and free space |
| US2818565A (en) * | 1956-09-05 | 1957-12-31 | James S Ajioka | Slab excited continuous slot antenna |
| US3004259A (en) * | 1958-07-21 | 1961-10-10 | Hughes Aircraft Co | Electrically variable waveguide slot with longitudinal polarization |
| US4435715A (en) * | 1980-09-29 | 1984-03-06 | Hughes Aircraft Company | Rod-excited waveguide slot antenna |
| FR2654555B1 (en) * | 1989-11-14 | 1992-06-19 | Thomson Csf | GUIDE TO RADIANT SLOTS NOT INCLINED WITH EXCITATION BY RADIATION PATTERN. |
| US5030965A (en) * | 1989-11-15 | 1991-07-09 | Hughes Aircraft Company | Slot antenna having controllable polarization |
-
1991
- 1991-12-31 FR FR9116384A patent/FR2685820B1/en not_active Expired - Fee Related
-
1992
- 1992-12-15 CA CA002085453A patent/CA2085453A1/en not_active Abandoned
- 1992-12-15 US US07/991,374 patent/US5422652A/en not_active Expired - Fee Related
- 1992-12-21 DE DE69215202T patent/DE69215202T2/en not_active Expired - Fee Related
- 1992-12-21 EP EP92403491A patent/EP0550320B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| FR2685820A1 (en) | 1993-07-02 |
| FR2685820B1 (en) | 1994-03-18 |
| EP0550320A1 (en) | 1993-07-07 |
| DE69215202T2 (en) | 1997-03-27 |
| DE69215202D1 (en) | 1996-12-19 |
| US5422652A (en) | 1995-06-06 |
| CA2085453A1 (en) | 1993-06-22 |
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