EP1184930B1 - Frequency selective surface waveguide filter - Google Patents
Frequency selective surface waveguide filter Download PDFInfo
- Publication number
- EP1184930B1 EP1184930B1 EP00118658A EP00118658A EP1184930B1 EP 1184930 B1 EP1184930 B1 EP 1184930B1 EP 00118658 A EP00118658 A EP 00118658A EP 00118658 A EP00118658 A EP 00118658A EP 1184930 B1 EP1184930 B1 EP 1184930B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- waveguide
- frequency selective
- microstrip
- selective surface
- filter
- 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
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
- H01P5/10—Coupling devices of the waveguide type for linking dissimilar lines or devices for coupling balanced with unbalanced lines or devices
- H01P5/107—Hollow-waveguide/strip-line transitions
Definitions
- This invention relates generally to the separation of different wavelengths of electromagnetic waves. More specifically, the invention relates to the separation of electromagnetic waves utilizing a waveguide incorporating a two-dimensional frequency selective surface combined with a waveguide to microstrip transition.
- Microwave energy can be propagated in a number of different modes, and in a number of physical structures.
- the microwave energy propagated through such structures can exist at any arbitrary frequency or spectrum of frequencies.
- devices known as filters are commonly placed in the structure to separate the broad spectrum of microwave frequencies into specific frequencies.
- Waveguides offer very low loss to the passage of such waves, and further, confine the energy within the waveguide.
- One of the functions waveguides can be used for is the above-mentioned filtering, i.e. selection or suppression of a specific band of frequencies from a broad spectrum of frequencies.
- a single element positioned transversely in the waveguide may be sufficient for the desired degree of filtering.
- An example of this is a simple band-stop filter described in " Bandstop Iris for Rectangular Waveguide" by N.G. Patterson and I. Anderson, in Electronics Letters, 28th October 1976, Vol. 12, No.22 .
- the filter element is in the form of an iris in which the metallic pattern simulates an inductor and capacitor in series, (i.e. a bandstop structure). If the filtering effect is sufficient for a given requirement, such a simple structure does reduce the length of the waveguide.
- the waveguide may have to be equipped with a transition to another medium (e.g. a coaxial cable or a microstrip circuit) that requires an additional length of waveguide.
- microstrip Another structure commonly used for the transmission of electromagnetic energy is the microstrip.
- filters may be constructed using microstrip circuits.
- a microstrip circuit consists of a thin-film metallic trace deposited on a dielectric substrate.
- Conventional microstrip filters consist of planar conductive elements, which simulate inductors, capacitors, and resonant elements.
- a problem that arises when microstrip filters are employed to filter electromagnetic energy is that microwave energy outside of the frequency band of interest may bypass the microstrip circuitry, thus causing degradation of the filtering effect.
- conventional microstrip filters present a higher unwanted loss to the selected desired signal than waveguide filters.
- FSS Frequency Selective Surface
- FSS's although planar like microstrips, act on waves propagating in free space. They are used in certain antenna configurations to pass one band of frequencies and reflect another. They may be realized either by using a metallic plate with cutouts (e.g. holes of a certain size) or by a metallic pattern on a dielectric substrate, similar to a microstrip circuit with resonant circuits. It is possible to insert such planar structures into a waveguide to achieve a filtering effect.
- An important characteristic, for the purpose of comparison with other, FSS-like structures, is the fact that every such planar element can function as a filter on its own. The placement of more such elements along the longitudinal axis of the waveguide with proper spacings intensifies the filtering action.
- US Pat. No. 4,598,262 discloses a structure that, at first glance, appears to bear similarities to a FSS-type waveguide filter. It uses a series of transverse grating elements longitudinally repeated in a waveguide. However, the individual grating elements do not exhibit frequency selectivity of their own. Rather they simply pass a signal with a certain polarization and reflect a signal with polarization orthogonal to that of the former, regardless of frequency.
- the frequency sensitivity (i.e. filtering effect) is achieved by applying the signal in two orthogonal modes to the waveguide and orienting the gratings at predefined angles.
- This separation can be in the form of waveguide filters, located within the waveguide, or can be in the form of microstrip structures, located on the microstrip substrate, external to the waveguide.
- the transition is in yet another physical location in the waveguide.
- the resulting structure is relatively large and costly even in cases where a single-element waveguide filter would be sufficient for the degree of filtering required.
- the waveguide filter of this invention consists of a frequency selective surface oriented transversely within the waveguide and having a two-dimensional array of conductor elements supported by a dielectric substrate.
- the array of conductor elements is formed by a repeating geometric pattern.
- the repeating geometric pattern may be a multiplicity of open loops, crosses or grids.
- the arrangement of the repeating geometric pattern results in the formation of a number of inductive and capacitive elements.
- the interaction of these elements offers little opposition to certain frequencies while blocking other frequencies.
- the determination of which frequencies are allowed to pass through the filter, and which are opposed, is a function of the shape, width and spacing of the inductive and capacitive elements of the frequency selective surface.
- the waveguide, and thus the waveguide filter, of the present invention may have any cross-sectional shape including square, rectangular and circular.
- the signal enters the waveguide at one end, in a transverse mode known as the TE 1,0 mode.
- the signal is propagated at low loss in a longitudinal direction within the waveguide.
- Transversely located within the waveguide is a frequency sensitive surface. Electromagnetic waves of specified frequencies pass through the frequency sensitive surface unimpeded, whereas others are reflected by the filter elements. The waves which are selected and transmitted through the film continue to be propagated longitudinally along the waveguide.
- An alternate embodiment utilizes a waveguide having a circular cross-section.
- the frequency selective surface is also circular, and the filter elements on the frequency selective surface may be in the form of concentric circular sections.
- multiple frequency selective surfaces are employed, transversely oriented and longitudinally deployed along a waveguide.
- the required separation between such surfaces is a function of the wavelength of the electromagnetic spectrum to be transmitted or reflected.
- the waveguide filter of the present invention additionally comprises, on a common dielectric substrate, a frequency selective surface combined with a waveguide to microstrip transition in the form of a planar stub, operative to provide efficient coupling between the frequency selective surface and external microstrip circuitry.
- a section of a rectangular waveguide 10 is shown having a frequency selective surface 12 inserted within.
- the frequency selective surface 12 may have any of a number of patterns, so chosen as to perform the desired filtering action.
- the frequency selective surface 12 consists of a two-dimensional pattern produced on a metallic film supported by a dielectric substrate.
- the two-dimensional pattern produced on the metallic film consists of an array of outer conductor elements 14 and inner conductor elements 16.
- the outer and inner conductors elements 14 and 16 are formed from an electrically conductive metal.
- the conductive metal may be copper, gold, platinum or any material capable of conducting electricity and suitable for deposition on a dielectric substrate.
- the outer conductor elements 14 and inner conductor elements 16 are separated by spaces which may be formed by selective etching of thin metallic foil.
- the outer conductive elements 14 each consist of discrete open center loops. The loop of each outer conductive element 14 begins and terminates on the inner surface of the waveguide 10.
- the outer conductive elements 14 form a symmetric, repeating pattern that may be repeated any number of replications required to perform a specific application.
- the inner conductive elements 16 are arranged in a periodic array.
- the portions 18 of the inner conductive elements 16 that are parallel to the electric field component of the microwaves within the waveguide act as inductive elements (the direction of the electric field component is indicated by arrow A of Fig. 1 ).
- portions 18 of the inner conductive elements 16 create inductive elements within the waveguide that are functionally similar to inductor 27 (L1), in the discrete element equivalent circuit 26 .
- This capacitive element is functionally similar to capacitor 30 (C), as shown in Fig. 3 .
- the portions of the outer conductive elements 14 that are parallel to the electric field component within the waveguide are functionally similar to inductor 28 (L2), also shown in Fig. 3 .
- an alternate embodiment of the waveguide filter of this invention is depicted as having a circular frequency selective surface.
- the frequency selective surface is formed by the selective etching of a thin metallic foil yielding conductor elements 36 and 38 .
- the resulting circular frequency selective surface 34 is utilized within a cylindrical waveguide 32 .
- multiple frequency selective surfaces 42, 44 and 46 are shown deployed in a section of waveguide 40 , where the waveguide has a rectangular cross-section.
- the use of multiple circular waveguide filters may also be deployed within a cylindrical waveguide.
- Fig. 6 shows a waveguide filter in which a frequency selective surface 50 has been combined with a waveguide to microstrip transition 52 .
- the transition is a planar stub.
- the transition is co-located with the frequency selective surface on a supporting substrate.
- the substrate with the waveguide to microstrip transition 52 and the frequency selective surface 50 is transversally inserted into the rectangular waveguide 48.
- An exit port 54 is located in the wall of the waveguide 48 to enable waveguide to microstrip transition 52 to be coupled to external microstrip circuitry (not shown).
- the frequency selective surface 50 consists of a planar surface formed from a dielectric substrate coated with an electrically conductive metallic film. Specific portions of the metallic film have been removed to form circuit elements.
- the residual metallic film comprises an array of frequency selective surface filtering elements 56 and a waveguide to microstrip transition 52.
- the filtering elements 56 consist of a multiplicity of discrete open center square loops. The sizes of these loops are mathematically determined from the frequencies to be reflected or transmitted. While this invention is not limited to any one pattern, a specific pattern is shown in order to explain the functioning of the invention.
- the microstrip to waveguide transition 52 is approximately centrally located with respect to the frequency selective surface 50.
- the dimensions of the waveguide to microstrip transition 52 are determined by the impedance of the connecting microstrip circuit (not shown) which is external to the waveguide 48, and the dimensions of the waveguide 48.
- the dimensions of the waveguide to microstrip transition 52 can be varied, or impedance matching circuitry can be employed on the external microstrip circuit.
- the dielectric substrate supporting the frequency selective surface 50 and waveguide-to-microstrip transition 52 is located one-quarter of one electrical wavelength away from the short-circuited end 58 of the waveguide 48, said wavelength being that of the signal at the center of the frequency band desired to be efficiently transmitted through the structure. This ensures that the waveguide to microstrip transition 52 is located at a point of maximum electric field strength, which in turn enables optimum coupling between the waveguide and the external microstrip circuit.
- the performance of the integrated microstrip to waveguide transition and filter inserted in a waveguide can be seen to consist of a passband in which efficient and symmetrical transmission exists between the waveguide and the external microstrip circuit. Also, the filtering action is demonstrated by the suppression of the signal at either extremity of the band pass portion.
- This invention is not intended to be limited to the filtering and coupling characteristics illustrated in Fig. 7 . Said characteristics are representative of one embodiment only, to illustrate by means of example, the results obtainable by means of this invention.
Abstract
Description
- This invention relates generally to the separation of different wavelengths of electromagnetic waves. More specifically, the invention relates to the separation of electromagnetic waves utilizing a waveguide incorporating a two-dimensional frequency selective surface combined with a waveguide to microstrip transition.
- Microwave energy can be propagated in a number of different modes, and in a number of physical structures. The microwave energy propagated through such structures can exist at any arbitrary frequency or spectrum of frequencies. In general, for a given application only specific frequencies from the spectrum are utilized. Therefore, devices known as filters are commonly placed in the structure to separate the broad spectrum of microwave frequencies into specific frequencies.
- One of the structures commonly employed for the transmission of electromagnetic energy is the waveguide. Waveguides offer very low loss to the passage of such waves, and further, confine the energy within the waveguide. One of the functions waveguides can be used for is the above-mentioned filtering, i.e. selection or suppression of a specific band of frequencies from a broad spectrum of frequencies.
- Conventional waveguide filters for separating different frequencies or wavelengths generally rely on three-dimensional structures that simulate, in electromagnetic wave form, the well-known filter elements encountered at lower frequencies, such as inductors, capacitors, and combinations of same to form resonant and anti-resonant circuits. These filter elements may consist of posts, irises, and other physical shapes located both transversely and longitudinally along the waveguide. Along the longitudinal axis, the filter elements are separated by defined fractions of electromagnetic wavelengths. These fractions of wavelengths are defined by well known mathematical relationships between the frequency of the band of electromagnetic energy being transmitted and the dimensions of the waveguide. The more filter elements are used along the longitudinal axis of the waveguide, the greater the filtering effect and, unfortunately, the size of the waveguide. Thus, due to the nature of the elements used, conventional waveguide filters are relatively complex as well as large in size, thereby proving disadvantageous in applications where low cost and small physical size are essential.
- In some cases however, a single element positioned transversely in the waveguide may be sufficient for the desired degree of filtering. An example of this is a simple band-stop filter described in "Bandstop Iris for Rectangular Waveguide" by N.G. Patterson and I. Anderson, in Electronics Letters, 28th October 1976, Vol. 12, No.22. The filter element is in the form of an iris in which the metallic pattern simulates an inductor and capacitor in series, (i.e. a bandstop structure). If the filtering effect is sufficient for a given requirement, such a simple structure does reduce the length of the waveguide. However, in addition to the iris, for excitation purposes the waveguide may have to be equipped with a transition to another medium (e.g. a coaxial cable or a microstrip circuit) that requires an additional length of waveguide.
- Another structure commonly used for the transmission of electromagnetic energy is the microstrip. Correspondingly, filters may be constructed using microstrip circuits. A microstrip circuit consists of a thin-film metallic trace deposited on a dielectric substrate. Conventional microstrip filters consist of planar conductive elements, which simulate inductors, capacitors, and resonant elements. A problem that arises when microstrip filters are employed to filter electromagnetic energy is that microwave energy outside of the frequency band of interest may bypass the microstrip circuitry, thus causing degradation of the filtering effect. In addition to lower filtering performance compared to waveguide filters, conventional microstrip filters present a higher unwanted loss to the selected desired signal than waveguide filters.
- Another structure used to filter electromagnetic signals is known as a Frequency Selective Surface (FSS).
- FSS's, although planar like microstrips, act on waves propagating in free space. They are used in certain antenna configurations to pass one band of frequencies and reflect another. They may be realized either by using a metallic plate with cutouts (e.g. holes of a certain size) or by a metallic pattern on a dielectric substrate, similar to a microstrip circuit with resonant circuits. It is possible to insert such planar structures into a waveguide to achieve a filtering effect. An important characteristic, for the purpose of comparison with other, FSS-like structures, is the fact that every such planar element can function as a filter on its own. The placement of more such elements along the longitudinal axis of the waveguide with proper spacings intensifies the filtering action.
-
US Pat. No. 4,598,262 discloses a structure that, at first glance, appears to bear similarities to a FSS-type waveguide filter. It uses a series of transverse grating elements longitudinally repeated in a waveguide. However, the individual grating elements do not exhibit frequency selectivity of their own. Rather they simply pass a signal with a certain polarization and reflect a signal with polarization orthogonal to that of the former, regardless of frequency. The frequency sensitivity, (i.e. filtering effect) is achieved by applying the signal in two orthogonal modes to the waveguide and orienting the gratings at predefined angles. This, combined with proper spacing of the individual grating elements, results in a series of partial transmissions and reflections which support or cancel each other in the frequency band to be transmitted (or rejected). Thus this type of filter is fundamentally different from those using true resonant FSS structures. It is also bulky as it requires a converter from a single mode to two orthogonal modes on each end of the structure. - Apart from filtering considerations per se, it is frequently necessary to provide a transition between electromagnetic waves existing in a waveguide and electromagnetic waves in an external medium, such as a microstrip. Where both a filter and a transition from microstrip to waveguide are required, it is common practice to separate these two functions.
- This separation can be in the form of waveguide filters, located within the waveguide, or can be in the form of microstrip structures, located on the microstrip substrate, external to the waveguide. The transition is in yet another physical location in the waveguide. The resulting structure is relatively large and costly even in cases where a single-element waveguide filter would be sufficient for the degree of filtering required.
- Accordingly, it is an object of this invention to apply the FSS principle to a provide a high performance waveguide filter suitable for applications where low cost and small physical size is required.
- In general, the waveguide filter of this invention consists of a frequency selective surface oriented transversely within the waveguide and having a two-dimensional array of conductor elements supported by a dielectric substrate. The array of conductor elements is formed by a repeating geometric pattern. The repeating geometric pattern may be a multiplicity of open loops, crosses or grids. The arrangement of the repeating geometric pattern results in the formation of a number of inductive and capacitive elements. The interaction of these elements offers little opposition to certain frequencies while blocking other frequencies. The determination of which frequencies are allowed to pass through the filter, and which are opposed, is a function of the shape, width and spacing of the inductive and capacitive elements of the frequency selective surface.
- The waveguide, and thus the waveguide filter, of the present invention may have any cross-sectional shape including square, rectangular and circular.
- In an embodiment having a waveguide with a rectangular cross-section and a rectangular waveguide filter, the signal enters the waveguide at one end, in a transverse mode known as the TE1,0 mode. The signal is propagated at low loss in a longitudinal direction within the waveguide. Transversely located within the waveguide is a frequency sensitive surface. Electromagnetic waves of specified frequencies pass through the frequency sensitive surface unimpeded, whereas others are reflected by the filter elements. The waves which are selected and transmitted through the film continue to be propagated longitudinally along the waveguide.
- An alternate embodiment utilizes a waveguide having a circular cross-section. In this embodiment, the frequency selective surface is also circular, and the filter elements on the frequency selective surface may be in the form of concentric circular sections.
- In still a further embodiment, multiple frequency selective surfaces are employed, transversely oriented and longitudinally deployed along a waveguide. The required separation between such surfaces is a function of the wavelength of the electromagnetic spectrum to be transmitted or reflected.
- The waveguide filter of the present invention additionally comprises, on a common dielectric substrate, a frequency selective surface combined with a waveguide to microstrip transition in the form of a planar stub, operative to provide efficient coupling between the frequency selective surface and external microstrip circuitry.
- Many objects and advantages of the present invention will be apparent to those of ordinary skill in the art when this specification is read in conjunction with the attached drawings wherein like reference numerals are applied to like elements and wherein:
- Fig. 1 is a cut-away view of a section of a rectangular waveguide incorporating a frequency selective surface;
- Fig. 2 is a view of a rectangular embodiment of the frequency selective surface of this invention;
- Fig. 3 is a diagram of a circuit equivalent of the frequency selective surface depicted in Fig. 2;
- Fig. 4 is a cut-away view of a section of a cylindrical waveguide incorporating a circular frequency selective surface;
- Fig. 5 is a cut-away view of a section of a rectangular waveguide comprising a plurality of frequency selective surfaces;
- Fig. 6 is a cut-away view of a section of a rectangular waveguide comprising a frequency selective surface with a waveguide to microstrip transition; and
- Fig. 7 is a graph illustrating the coupling and filtering performance of the waveguide filter of Fig. 6.
- Referring to Fig. 1, a section of a
rectangular waveguide 10 is shown having a frequencyselective surface 12 inserted within. The frequencyselective surface 12 may have any of a number of patterns, so chosen as to perform the desired filtering action. - Referring to Fig. 2, an embodiment of the frequency
selective surface 12 is shown. The frequencyselective surface 12 consists of a two-dimensional pattern produced on a metallic film supported by a dielectric substrate. The two-dimensional pattern produced on the metallic film consists of an array ofouter conductor elements 14 andinner conductor elements 16. The outer andinner conductors elements outer conductor elements 14 andinner conductor elements 16 are separated by spaces which may be formed by selective etching of thin metallic foil. The outerconductive elements 14 each consist of discrete open center loops. The loop of each outerconductive element 14 begins and terminates on the inner surface of thewaveguide 10. The outerconductive elements 14 form a symmetric, repeating pattern that may be repeated any number of replications required to perform a specific application. - The inner
conductive elements 16 are arranged in a periodic array. Theportions 18 of the innerconductive elements 16 that are parallel to the electric field component of the microwaves within the waveguide act as inductive elements (the direction of the electric field component is indicated by arrow A of Fig. 1). - Referring to Figs. 2 and 3,
portions 18 of the innerconductive elements 16 create inductive elements within the waveguide that are functionally similar to inductor 27 (L1), in the discrete elementequivalent circuit 26. Theedges 20 of the innerconductive element 16 that are perpendicular to the electric field component within the waveguide, in conjunction with theedges 22 of the outerconductive elements 14, that are perpendicular to the electric field component within the waveguide, act as a capacitive element. This capacitive element is functionally similar to capacitor 30 (C), as shown in Fig. 3. The portions of the outerconductive elements 14 that are parallel to the electric field component within the waveguide are functionally similar to inductor 28 (L2), also shown in Fig. 3. - Referring to Fig. 4, an alternate embodiment of the waveguide filter of this invention is depicted as having a circular frequency selective surface. The frequency selective surface is formed by the selective etching of a thin metallic foil yielding
conductor elements selective surface 34 is utilized within acylindrical waveguide 32. - Referring to Fig. 5, multiple frequency
selective surfaces waveguide 40, where the waveguide has a rectangular cross-section. The use of multiple circular waveguide filters may also be deployed within a cylindrical waveguide. - Fig. 6 shows a waveguide filter in which a frequency
selective surface 50 has been combined with a waveguide tomicrostrip transition 52. Essentially, the transition is a planar stub. - The transition is co-located with the frequency selective surface on a supporting substrate. The substrate with the waveguide to
microstrip transition 52 and the frequencyselective surface 50 is transversally inserted into therectangular waveguide 48. Anexit port 54 is located in the wall of thewaveguide 48 to enable waveguide tomicrostrip transition 52 to be coupled to external microstrip circuitry (not shown). - The frequency
selective surface 50 consists of a planar surface formed from a dielectric substrate coated with an electrically conductive metallic film. Specific portions of the metallic film have been removed to form circuit elements. The residual metallic film comprises an array of frequency selectivesurface filtering elements 56 and a waveguide tomicrostrip transition 52. Thefiltering elements 56 consist of a multiplicity of discrete open center square loops. The sizes of these loops are mathematically determined from the frequencies to be reflected or transmitted. While this invention is not limited to any one pattern, a specific pattern is shown in order to explain the functioning of the invention. - Again with reference to Figure 6, the microstrip to
waveguide transition 52 is approximately centrally located with respect to the frequencyselective surface 50. The dimensions of the waveguide tomicrostrip transition 52 are determined by the impedance of the connecting microstrip circuit (not shown) which is external to thewaveguide 48, and the dimensions of thewaveguide 48. In order to obtain an efficient coupling between thewaveguide 48 and the external microstrip circuit, either the dimensions of the waveguide tomicrostrip transition 52 can be varied, or impedance matching circuitry can be employed on the external microstrip circuit. - The dielectric substrate supporting the frequency
selective surface 50 and waveguide-to-microstrip transition 52 is located one-quarter of one electrical wavelength away from the short-circuitedend 58 of thewaveguide 48, said wavelength being that of the signal at the center of the frequency band desired to be efficiently transmitted through the structure. This ensures that the waveguide tomicrostrip transition 52 is located at a point of maximum electric field strength, which in turn enables optimum coupling between the waveguide and the external microstrip circuit. - With reference to Fig. 7, the performance of the integrated microstrip to waveguide transition and filter inserted in a waveguide, can be seen to consist of a passband in which efficient and symmetrical transmission exists between the waveguide and the external microstrip circuit. Also, the filtering action is demonstrated by the suppression of the signal at either extremity of the band pass portion. This invention is not intended to be limited to the filtering and coupling characteristics illustrated in Fig. 7. Said characteristics are representative of one embodiment only, to illustrate by means of example, the results obtainable by means of this invention.
Claims (7)
- A waveguide filter comprising:(a) a waveguide (10; 32; 40; 48);(b) a frequency selective surface (12; 34; 42, 44, 46; 50) located within said waveguide (10; 32; 40; 48), said frequency selective surface (12; 34; 42, 44, 46; 50) comprising a planar electrically conductive film supported on a dielectric substrate located within said waveguide (10; 32; 40; 48) and oriented orthogonally to walls of said waveguide (10; 32; 40; 48); characterised by(c) a microstrip located externally to said waveguide (10; 32; 40; 48); and(d) a waveguide to microstrip transition (52), which couples said waveguide (10; 32; 40; 48) to said microstrip, wherein at least a portion of said waveguide to microstrip transition (52) is located on said substrate.
- The waveguide filter according to claim 1, wherein said film is selectively etched to form inductive and conductive elements.
- The waveguide filter according to claim 2, wherein said electrically conductive film is a copper film.
- The waveguide filter according to claim 1, wherein said waveguide has a rectangular cross-section and said frequency selective surface has a rectangular shape complementary to said cross-section of said waveguide.
- The waveguide filter of claim 1, wherein said frequency selective surface is located at a distance from a short-circuited end of said waveguide, said distance equal to one quarter of an electrical wavelength of a signal that is at the center of a frequency band desired to be efficiently passed through said waveguide filter.
- The waveguide filter of claim 1, wherein said waveguide filter comprises a plurality of frequency selective surfaces longitudinally spaced along an interior of said waveguide and orthogonally oriented with respect to said walls of said waveguide.
- The waveguide filter of claim 1, wherein said microstrip additionally comprises impedance matching circuitry.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00118658A EP1184930B1 (en) | 2000-08-28 | 2000-08-28 | Frequency selective surface waveguide filter |
AT00118658T ATE379852T1 (en) | 2000-08-28 | 2000-08-28 | WAVE GUIDE FILTER WITH FREQUENCY SELECTIVE SURFACE |
DE60037247T DE60037247T2 (en) | 2000-08-28 | 2000-08-28 | Waveguide filter with frequency-selective surface |
ES00118658T ES2296589T3 (en) | 2000-08-28 | 2000-08-28 | WAVE GUIDE FILTER WITH A SELECTIVE FREQUENCY SURFACE. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00118658A EP1184930B1 (en) | 2000-08-28 | 2000-08-28 | Frequency selective surface waveguide filter |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1184930A1 EP1184930A1 (en) | 2002-03-06 |
EP1184930B1 true EP1184930B1 (en) | 2007-11-28 |
Family
ID=8169681
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00118658A Expired - Lifetime EP1184930B1 (en) | 2000-08-28 | 2000-08-28 | Frequency selective surface waveguide filter |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1184930B1 (en) |
AT (1) | ATE379852T1 (en) |
DE (1) | DE60037247T2 (en) |
ES (1) | ES2296589T3 (en) |
Families Citing this family (165)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2261028B1 (en) * | 2004-08-20 | 2007-11-16 | Universidad Publica De Navarra | FREQUENCY FILTER AND SELECTIVE SURFACES. |
CN102903998B (en) * | 2011-07-29 | 2016-03-16 | 深圳光启高等理工研究院 | A kind of resonant cavity |
US10009065B2 (en) | 2012-12-05 | 2018-06-26 | At&T Intellectual Property I, L.P. | Backhaul link for distributed antenna system |
US9113347B2 (en) | 2012-12-05 | 2015-08-18 | At&T Intellectual Property I, Lp | Backhaul link for distributed antenna system |
US9999038B2 (en) | 2013-05-31 | 2018-06-12 | At&T Intellectual Property I, L.P. | Remote distributed antenna system |
US9525524B2 (en) | 2013-05-31 | 2016-12-20 | At&T Intellectual Property I, L.P. | Remote distributed antenna system |
US8897697B1 (en) | 2013-11-06 | 2014-11-25 | At&T Intellectual Property I, Lp | Millimeter-wave surface-wave communications |
US9209902B2 (en) | 2013-12-10 | 2015-12-08 | At&T Intellectual Property I, L.P. | Quasi-optical coupler |
US9692101B2 (en) | 2014-08-26 | 2017-06-27 | At&T Intellectual Property I, L.P. | Guided wave couplers for coupling electromagnetic waves between a waveguide surface and a surface of a wire |
US9768833B2 (en) | 2014-09-15 | 2017-09-19 | At&T Intellectual Property I, L.P. | Method and apparatus for sensing a condition in a transmission medium of electromagnetic waves |
US10063280B2 (en) | 2014-09-17 | 2018-08-28 | At&T Intellectual Property I, L.P. | Monitoring and mitigating conditions in a communication network |
US9628854B2 (en) | 2014-09-29 | 2017-04-18 | At&T Intellectual Property I, L.P. | Method and apparatus for distributing content in a communication network |
US9615269B2 (en) | 2014-10-02 | 2017-04-04 | At&T Intellectual Property I, L.P. | Method and apparatus that provides fault tolerance in a communication network |
US9685992B2 (en) | 2014-10-03 | 2017-06-20 | At&T Intellectual Property I, L.P. | Circuit panel network and methods thereof |
US9503189B2 (en) | 2014-10-10 | 2016-11-22 | At&T Intellectual Property I, L.P. | Method and apparatus for arranging communication sessions in a communication system |
US9973299B2 (en) | 2014-10-14 | 2018-05-15 | At&T Intellectual Property I, L.P. | Method and apparatus for adjusting a mode of communication in a communication network |
US9762289B2 (en) | 2014-10-14 | 2017-09-12 | At&T Intellectual Property I, L.P. | Method and apparatus for transmitting or receiving signals in a transportation system |
US9769020B2 (en) | 2014-10-21 | 2017-09-19 | At&T Intellectual Property I, L.P. | Method and apparatus for responding to events affecting communications in a communication network |
US9577306B2 (en) | 2014-10-21 | 2017-02-21 | At&T Intellectual Property I, L.P. | Guided-wave transmission device and methods for use therewith |
US9564947B2 (en) | 2014-10-21 | 2017-02-07 | At&T Intellectual Property I, L.P. | Guided-wave transmission device with diversity and methods for use therewith |
US9312919B1 (en) | 2014-10-21 | 2016-04-12 | At&T Intellectual Property I, Lp | Transmission device with impairment compensation and methods for use therewith |
US9780834B2 (en) | 2014-10-21 | 2017-10-03 | At&T Intellectual Property I, L.P. | Method and apparatus for transmitting electromagnetic waves |
US9653770B2 (en) | 2014-10-21 | 2017-05-16 | At&T Intellectual Property I, L.P. | Guided wave coupler, coupling module and methods for use therewith |
US9520945B2 (en) | 2014-10-21 | 2016-12-13 | At&T Intellectual Property I, L.P. | Apparatus for providing communication services and methods thereof |
US9627768B2 (en) | 2014-10-21 | 2017-04-18 | At&T Intellectual Property I, L.P. | Guided-wave transmission device with non-fundamental mode propagation and methods for use therewith |
US9654173B2 (en) | 2014-11-20 | 2017-05-16 | At&T Intellectual Property I, L.P. | Apparatus for powering a communication device and methods thereof |
US9544006B2 (en) | 2014-11-20 | 2017-01-10 | At&T Intellectual Property I, L.P. | Transmission device with mode division multiplexing and methods for use therewith |
US10340573B2 (en) | 2016-10-26 | 2019-07-02 | At&T Intellectual Property I, L.P. | Launcher with cylindrical coupling device and methods for use therewith |
US9954287B2 (en) | 2014-11-20 | 2018-04-24 | At&T Intellectual Property I, L.P. | Apparatus for converting wireless signals and electromagnetic waves and methods thereof |
US9680670B2 (en) | 2014-11-20 | 2017-06-13 | At&T Intellectual Property I, L.P. | Transmission device with channel equalization and control and methods for use therewith |
US9800327B2 (en) | 2014-11-20 | 2017-10-24 | At&T Intellectual Property I, L.P. | Apparatus for controlling operations of a communication device and methods thereof |
US9461706B1 (en) | 2015-07-31 | 2016-10-04 | At&T Intellectual Property I, Lp | Method and apparatus for exchanging communication signals |
US10243784B2 (en) | 2014-11-20 | 2019-03-26 | At&T Intellectual Property I, L.P. | System for generating topology information and methods thereof |
US10009067B2 (en) | 2014-12-04 | 2018-06-26 | At&T Intellectual Property I, L.P. | Method and apparatus for configuring a communication interface |
US9997819B2 (en) | 2015-06-09 | 2018-06-12 | At&T Intellectual Property I, L.P. | Transmission medium and method for facilitating propagation of electromagnetic waves via a core |
US9742462B2 (en) | 2014-12-04 | 2017-08-22 | At&T Intellectual Property I, L.P. | Transmission medium and communication interfaces and methods for use therewith |
US10144036B2 (en) | 2015-01-30 | 2018-12-04 | At&T Intellectual Property I, L.P. | Method and apparatus for mitigating interference affecting a propagation of electromagnetic waves guided by a transmission medium |
US9876570B2 (en) | 2015-02-20 | 2018-01-23 | At&T Intellectual Property I, Lp | Guided-wave transmission device with non-fundamental mode propagation and methods for use therewith |
US9749013B2 (en) | 2015-03-17 | 2017-08-29 | At&T Intellectual Property I, L.P. | Method and apparatus for reducing attenuation of electromagnetic waves guided by a transmission medium |
US10224981B2 (en) | 2015-04-24 | 2019-03-05 | At&T Intellectual Property I, Lp | Passive electrical coupling device and methods for use therewith |
US9705561B2 (en) | 2015-04-24 | 2017-07-11 | At&T Intellectual Property I, L.P. | Directional coupling device and methods for use therewith |
US9948354B2 (en) | 2015-04-28 | 2018-04-17 | At&T Intellectual Property I, L.P. | Magnetic coupling device with reflective plate and methods for use therewith |
US9793954B2 (en) | 2015-04-28 | 2017-10-17 | At&T Intellectual Property I, L.P. | Magnetic coupling device and methods for use therewith |
US9871282B2 (en) | 2015-05-14 | 2018-01-16 | At&T Intellectual Property I, L.P. | At least one transmission medium having a dielectric surface that is covered at least in part by a second dielectric |
US9748626B2 (en) | 2015-05-14 | 2017-08-29 | At&T Intellectual Property I, L.P. | Plurality of cables having different cross-sectional shapes which are bundled together to form a transmission medium |
US9490869B1 (en) | 2015-05-14 | 2016-11-08 | At&T Intellectual Property I, L.P. | Transmission medium having multiple cores and methods for use therewith |
US10679767B2 (en) | 2015-05-15 | 2020-06-09 | At&T Intellectual Property I, L.P. | Transmission medium having a conductive material and methods for use therewith |
US10650940B2 (en) | 2015-05-15 | 2020-05-12 | At&T Intellectual Property I, L.P. | Transmission medium having a conductive material and methods for use therewith |
US9917341B2 (en) | 2015-05-27 | 2018-03-13 | At&T Intellectual Property I, L.P. | Apparatus and method for launching electromagnetic waves and for modifying radial dimensions of the propagating electromagnetic waves |
US9866309B2 (en) | 2015-06-03 | 2018-01-09 | At&T Intellectual Property I, Lp | Host node device and methods for use therewith |
US9912381B2 (en) | 2015-06-03 | 2018-03-06 | At&T Intellectual Property I, Lp | Network termination and methods for use therewith |
US10154493B2 (en) | 2015-06-03 | 2018-12-11 | At&T Intellectual Property I, L.P. | Network termination and methods for use therewith |
US10103801B2 (en) | 2015-06-03 | 2018-10-16 | At&T Intellectual Property I, L.P. | Host node device and methods for use therewith |
US10812174B2 (en) | 2015-06-03 | 2020-10-20 | At&T Intellectual Property I, L.P. | Client node device and methods for use therewith |
US10348391B2 (en) | 2015-06-03 | 2019-07-09 | At&T Intellectual Property I, L.P. | Client node device with frequency conversion and methods for use therewith |
US9913139B2 (en) | 2015-06-09 | 2018-03-06 | At&T Intellectual Property I, L.P. | Signal fingerprinting for authentication of communicating devices |
US10142086B2 (en) | 2015-06-11 | 2018-11-27 | At&T Intellectual Property I, L.P. | Repeater and methods for use therewith |
US9608692B2 (en) | 2015-06-11 | 2017-03-28 | At&T Intellectual Property I, L.P. | Repeater and methods for use therewith |
US9820146B2 (en) | 2015-06-12 | 2017-11-14 | At&T Intellectual Property I, L.P. | Method and apparatus for authentication and identity management of communicating devices |
US9667317B2 (en) | 2015-06-15 | 2017-05-30 | At&T Intellectual Property I, L.P. | Method and apparatus for providing security using network traffic adjustments |
US9640850B2 (en) | 2015-06-25 | 2017-05-02 | At&T Intellectual Property I, L.P. | Methods and apparatus for inducing a non-fundamental wave mode on a transmission medium |
US9865911B2 (en) | 2015-06-25 | 2018-01-09 | At&T Intellectual Property I, L.P. | Waveguide system for slot radiating first electromagnetic waves that are combined into a non-fundamental wave mode second electromagnetic wave on a transmission medium |
US9509415B1 (en) | 2015-06-25 | 2016-11-29 | At&T Intellectual Property I, L.P. | Methods and apparatus for inducing a fundamental wave mode on a transmission medium |
US10170840B2 (en) | 2015-07-14 | 2019-01-01 | At&T Intellectual Property I, L.P. | Apparatus and methods for sending or receiving electromagnetic signals |
US10148016B2 (en) | 2015-07-14 | 2018-12-04 | At&T Intellectual Property I, L.P. | Apparatus and methods for communicating utilizing an antenna array |
US9882257B2 (en) | 2015-07-14 | 2018-01-30 | At&T Intellectual Property I, L.P. | Method and apparatus for launching a wave mode that mitigates interference |
US10044409B2 (en) | 2015-07-14 | 2018-08-07 | At&T Intellectual Property I, L.P. | Transmission medium and methods for use therewith |
US9722318B2 (en) | 2015-07-14 | 2017-08-01 | At&T Intellectual Property I, L.P. | Method and apparatus for coupling an antenna to a device |
US10341142B2 (en) | 2015-07-14 | 2019-07-02 | At&T Intellectual Property I, L.P. | Apparatus and methods for generating non-interfering electromagnetic waves on an uninsulated conductor |
US9836957B2 (en) | 2015-07-14 | 2017-12-05 | At&T Intellectual Property I, L.P. | Method and apparatus for communicating with premises equipment |
US10320586B2 (en) | 2015-07-14 | 2019-06-11 | At&T Intellectual Property I, L.P. | Apparatus and methods for generating non-interfering electromagnetic waves on an insulated transmission medium |
US10205655B2 (en) | 2015-07-14 | 2019-02-12 | At&T Intellectual Property I, L.P. | Apparatus and methods for communicating utilizing an antenna array and multiple communication paths |
US9847566B2 (en) | 2015-07-14 | 2017-12-19 | At&T Intellectual Property I, L.P. | Method and apparatus for adjusting a field of a signal to mitigate interference |
US9853342B2 (en) | 2015-07-14 | 2017-12-26 | At&T Intellectual Property I, L.P. | Dielectric transmission medium connector and methods for use therewith |
US10033108B2 (en) | 2015-07-14 | 2018-07-24 | At&T Intellectual Property I, L.P. | Apparatus and methods for generating an electromagnetic wave having a wave mode that mitigates interference |
US9628116B2 (en) | 2015-07-14 | 2017-04-18 | At&T Intellectual Property I, L.P. | Apparatus and methods for transmitting wireless signals |
US10033107B2 (en) | 2015-07-14 | 2018-07-24 | At&T Intellectual Property I, L.P. | Method and apparatus for coupling an antenna to a device |
US9608740B2 (en) | 2015-07-15 | 2017-03-28 | At&T Intellectual Property I, L.P. | Method and apparatus for launching a wave mode that mitigates interference |
US10090606B2 (en) | 2015-07-15 | 2018-10-02 | At&T Intellectual Property I, L.P. | Antenna system with dielectric array and methods for use therewith |
US9793951B2 (en) | 2015-07-15 | 2017-10-17 | At&T Intellectual Property I, L.P. | Method and apparatus for launching a wave mode that mitigates interference |
US9912027B2 (en) | 2015-07-23 | 2018-03-06 | At&T Intellectual Property I, L.P. | Method and apparatus for exchanging communication signals |
US10784670B2 (en) | 2015-07-23 | 2020-09-22 | At&T Intellectual Property I, L.P. | Antenna support for aligning an antenna |
US9749053B2 (en) | 2015-07-23 | 2017-08-29 | At&T Intellectual Property I, L.P. | Node device, repeater and methods for use therewith |
US9948333B2 (en) | 2015-07-23 | 2018-04-17 | At&T Intellectual Property I, L.P. | Method and apparatus for wireless communications to mitigate interference |
US9871283B2 (en) | 2015-07-23 | 2018-01-16 | At&T Intellectual Property I, Lp | Transmission medium having a dielectric core comprised of plural members connected by a ball and socket configuration |
US10020587B2 (en) | 2015-07-31 | 2018-07-10 | At&T Intellectual Property I, L.P. | Radial antenna and methods for use therewith |
US9967173B2 (en) | 2015-07-31 | 2018-05-08 | At&T Intellectual Property I, L.P. | Method and apparatus for authentication and identity management of communicating devices |
US9735833B2 (en) | 2015-07-31 | 2017-08-15 | At&T Intellectual Property I, L.P. | Method and apparatus for communications management in a neighborhood network |
US9904535B2 (en) | 2015-09-14 | 2018-02-27 | At&T Intellectual Property I, L.P. | Method and apparatus for distributing software |
US10079661B2 (en) | 2015-09-16 | 2018-09-18 | At&T Intellectual Property I, L.P. | Method and apparatus for use with a radio distributed antenna system having a clock reference |
US10009063B2 (en) | 2015-09-16 | 2018-06-26 | At&T Intellectual Property I, L.P. | Method and apparatus for use with a radio distributed antenna system having an out-of-band reference signal |
US10136434B2 (en) | 2015-09-16 | 2018-11-20 | At&T Intellectual Property I, L.P. | Method and apparatus for use with a radio distributed antenna system having an ultra-wideband control channel |
US10009901B2 (en) | 2015-09-16 | 2018-06-26 | At&T Intellectual Property I, L.P. | Method, apparatus, and computer-readable storage medium for managing utilization of wireless resources between base stations |
US9705571B2 (en) | 2015-09-16 | 2017-07-11 | At&T Intellectual Property I, L.P. | Method and apparatus for use with a radio distributed antenna system |
US10051629B2 (en) | 2015-09-16 | 2018-08-14 | At&T Intellectual Property I, L.P. | Method and apparatus for use with a radio distributed antenna system having an in-band reference signal |
US9769128B2 (en) | 2015-09-28 | 2017-09-19 | At&T Intellectual Property I, L.P. | Method and apparatus for encryption of communications over a network |
US9729197B2 (en) | 2015-10-01 | 2017-08-08 | At&T Intellectual Property I, L.P. | Method and apparatus for communicating network management traffic over a network |
US10074890B2 (en) | 2015-10-02 | 2018-09-11 | At&T Intellectual Property I, L.P. | Communication device and antenna with integrated light assembly |
US9876264B2 (en) | 2015-10-02 | 2018-01-23 | At&T Intellectual Property I, Lp | Communication system, guided wave switch and methods for use therewith |
US9882277B2 (en) | 2015-10-02 | 2018-01-30 | At&T Intellectual Property I, Lp | Communication device and antenna assembly with actuated gimbal mount |
US10665942B2 (en) | 2015-10-16 | 2020-05-26 | At&T Intellectual Property I, L.P. | Method and apparatus for adjusting wireless communications |
US10051483B2 (en) | 2015-10-16 | 2018-08-14 | At&T Intellectual Property I, L.P. | Method and apparatus for directing wireless signals |
US10355367B2 (en) | 2015-10-16 | 2019-07-16 | At&T Intellectual Property I, L.P. | Antenna structure for exchanging wireless signals |
US9912419B1 (en) | 2016-08-24 | 2018-03-06 | At&T Intellectual Property I, L.P. | Method and apparatus for managing a fault in a distributed antenna system |
US9860075B1 (en) | 2016-08-26 | 2018-01-02 | At&T Intellectual Property I, L.P. | Method and communication node for broadband distribution |
US10291311B2 (en) | 2016-09-09 | 2019-05-14 | At&T Intellectual Property I, L.P. | Method and apparatus for mitigating a fault in a distributed antenna system |
US11032819B2 (en) | 2016-09-15 | 2021-06-08 | At&T Intellectual Property I, L.P. | Method and apparatus for use with a radio distributed antenna system having a control channel reference signal |
US10340600B2 (en) | 2016-10-18 | 2019-07-02 | At&T Intellectual Property I, L.P. | Apparatus and methods for launching guided waves via plural waveguide systems |
US10135146B2 (en) | 2016-10-18 | 2018-11-20 | At&T Intellectual Property I, L.P. | Apparatus and methods for launching guided waves via circuits |
US10135147B2 (en) | 2016-10-18 | 2018-11-20 | At&T Intellectual Property I, L.P. | Apparatus and methods for launching guided waves via an antenna |
US9991580B2 (en) | 2016-10-21 | 2018-06-05 | At&T Intellectual Property I, L.P. | Launcher and coupling system for guided wave mode cancellation |
US10374316B2 (en) | 2016-10-21 | 2019-08-06 | At&T Intellectual Property I, L.P. | System and dielectric antenna with non-uniform dielectric |
US9876605B1 (en) | 2016-10-21 | 2018-01-23 | At&T Intellectual Property I, L.P. | Launcher and coupling system to support desired guided wave mode |
US10811767B2 (en) | 2016-10-21 | 2020-10-20 | At&T Intellectual Property I, L.P. | System and dielectric antenna with convex dielectric radome |
US10312567B2 (en) | 2016-10-26 | 2019-06-04 | At&T Intellectual Property I, L.P. | Launcher with planar strip antenna and methods for use therewith |
US10291334B2 (en) | 2016-11-03 | 2019-05-14 | At&T Intellectual Property I, L.P. | System for detecting a fault in a communication system |
US10498044B2 (en) | 2016-11-03 | 2019-12-03 | At&T Intellectual Property I, L.P. | Apparatus for configuring a surface of an antenna |
US10224634B2 (en) | 2016-11-03 | 2019-03-05 | At&T Intellectual Property I, L.P. | Methods and apparatus for adjusting an operational characteristic of an antenna |
US10225025B2 (en) | 2016-11-03 | 2019-03-05 | At&T Intellectual Property I, L.P. | Method and apparatus for detecting a fault in a communication system |
US10090594B2 (en) | 2016-11-23 | 2018-10-02 | At&T Intellectual Property I, L.P. | Antenna system having structural configurations for assembly |
US10340603B2 (en) | 2016-11-23 | 2019-07-02 | At&T Intellectual Property I, L.P. | Antenna system having shielded structural configurations for assembly |
US10178445B2 (en) | 2016-11-23 | 2019-01-08 | At&T Intellectual Property I, L.P. | Methods, devices, and systems for load balancing between a plurality of waveguides |
US10535928B2 (en) | 2016-11-23 | 2020-01-14 | At&T Intellectual Property I, L.P. | Antenna system and methods for use therewith |
US10340601B2 (en) | 2016-11-23 | 2019-07-02 | At&T Intellectual Property I, L.P. | Multi-antenna system and methods for use therewith |
US10305190B2 (en) | 2016-12-01 | 2019-05-28 | At&T Intellectual Property I, L.P. | Reflecting dielectric antenna system and methods for use therewith |
US10361489B2 (en) | 2016-12-01 | 2019-07-23 | At&T Intellectual Property I, L.P. | Dielectric dish antenna system and methods for use therewith |
US9927517B1 (en) | 2016-12-06 | 2018-03-27 | At&T Intellectual Property I, L.P. | Apparatus and methods for sensing rainfall |
US10694379B2 (en) | 2016-12-06 | 2020-06-23 | At&T Intellectual Property I, L.P. | Waveguide system with device-based authentication and methods for use therewith |
US10382976B2 (en) | 2016-12-06 | 2019-08-13 | At&T Intellectual Property I, L.P. | Method and apparatus for managing wireless communications based on communication paths and network device positions |
US10135145B2 (en) | 2016-12-06 | 2018-11-20 | At&T Intellectual Property I, L.P. | Apparatus and methods for generating an electromagnetic wave along a transmission medium |
US10637149B2 (en) | 2016-12-06 | 2020-04-28 | At&T Intellectual Property I, L.P. | Injection molded dielectric antenna and methods for use therewith |
US10020844B2 (en) | 2016-12-06 | 2018-07-10 | T&T Intellectual Property I, L.P. | Method and apparatus for broadcast communication via guided waves |
US10439675B2 (en) | 2016-12-06 | 2019-10-08 | At&T Intellectual Property I, L.P. | Method and apparatus for repeating guided wave communication signals |
US10755542B2 (en) | 2016-12-06 | 2020-08-25 | At&T Intellectual Property I, L.P. | Method and apparatus for surveillance via guided wave communication |
US10727599B2 (en) | 2016-12-06 | 2020-07-28 | At&T Intellectual Property I, L.P. | Launcher with slot antenna and methods for use therewith |
US10326494B2 (en) | 2016-12-06 | 2019-06-18 | At&T Intellectual Property I, L.P. | Apparatus for measurement de-embedding and methods for use therewith |
US10819035B2 (en) | 2016-12-06 | 2020-10-27 | At&T Intellectual Property I, L.P. | Launcher with helical antenna and methods for use therewith |
US10027397B2 (en) | 2016-12-07 | 2018-07-17 | At&T Intellectual Property I, L.P. | Distributed antenna system and methods for use therewith |
US10547348B2 (en) | 2016-12-07 | 2020-01-28 | At&T Intellectual Property I, L.P. | Method and apparatus for switching transmission mediums in a communication system |
US10243270B2 (en) | 2016-12-07 | 2019-03-26 | At&T Intellectual Property I, L.P. | Beam adaptive multi-feed dielectric antenna system and methods for use therewith |
US10389029B2 (en) | 2016-12-07 | 2019-08-20 | At&T Intellectual Property I, L.P. | Multi-feed dielectric antenna system with core selection and methods for use therewith |
US10168695B2 (en) | 2016-12-07 | 2019-01-01 | At&T Intellectual Property I, L.P. | Method and apparatus for controlling an unmanned aircraft |
US9893795B1 (en) | 2016-12-07 | 2018-02-13 | At&T Intellectual Property I, Lp | Method and repeater for broadband distribution |
US10139820B2 (en) | 2016-12-07 | 2018-11-27 | At&T Intellectual Property I, L.P. | Method and apparatus for deploying equipment of a communication system |
US10446936B2 (en) | 2016-12-07 | 2019-10-15 | At&T Intellectual Property I, L.P. | Multi-feed dielectric antenna system and methods for use therewith |
US10359749B2 (en) | 2016-12-07 | 2019-07-23 | At&T Intellectual Property I, L.P. | Method and apparatus for utilities management via guided wave communication |
US10938108B2 (en) | 2016-12-08 | 2021-03-02 | At&T Intellectual Property I, L.P. | Frequency selective multi-feed dielectric antenna system and methods for use therewith |
US10103422B2 (en) | 2016-12-08 | 2018-10-16 | At&T Intellectual Property I, L.P. | Method and apparatus for mounting network devices |
US10601494B2 (en) | 2016-12-08 | 2020-03-24 | At&T Intellectual Property I, L.P. | Dual-band communication device and method for use therewith |
US10916969B2 (en) | 2016-12-08 | 2021-02-09 | At&T Intellectual Property I, L.P. | Method and apparatus for providing power using an inductive coupling |
US10530505B2 (en) | 2016-12-08 | 2020-01-07 | At&T Intellectual Property I, L.P. | Apparatus and methods for launching electromagnetic waves along a transmission medium |
US10777873B2 (en) | 2016-12-08 | 2020-09-15 | At&T Intellectual Property I, L.P. | Method and apparatus for mounting network devices |
US9911020B1 (en) | 2016-12-08 | 2018-03-06 | At&T Intellectual Property I, L.P. | Method and apparatus for tracking via a radio frequency identification device |
US10411356B2 (en) | 2016-12-08 | 2019-09-10 | At&T Intellectual Property I, L.P. | Apparatus and methods for selectively targeting communication devices with an antenna array |
US10326689B2 (en) | 2016-12-08 | 2019-06-18 | At&T Intellectual Property I, L.P. | Method and system for providing alternative communication paths |
US10069535B2 (en) | 2016-12-08 | 2018-09-04 | At&T Intellectual Property I, L.P. | Apparatus and methods for launching electromagnetic waves having a certain electric field structure |
US9998870B1 (en) | 2016-12-08 | 2018-06-12 | At&T Intellectual Property I, L.P. | Method and apparatus for proximity sensing |
US10389037B2 (en) | 2016-12-08 | 2019-08-20 | At&T Intellectual Property I, L.P. | Apparatus and methods for selecting sections of an antenna array and use therewith |
US10264586B2 (en) | 2016-12-09 | 2019-04-16 | At&T Mobility Ii Llc | Cloud-based packet controller and methods for use therewith |
US10340983B2 (en) | 2016-12-09 | 2019-07-02 | At&T Intellectual Property I, L.P. | Method and apparatus for surveying remote sites via guided wave communications |
US9838896B1 (en) | 2016-12-09 | 2017-12-05 | At&T Intellectual Property I, L.P. | Method and apparatus for assessing network coverage |
US9973940B1 (en) | 2017-02-27 | 2018-05-15 | At&T Intellectual Property I, L.P. | Apparatus and methods for dynamic impedance matching of a guided wave launcher |
US10298293B2 (en) | 2017-03-13 | 2019-05-21 | At&T Intellectual Property I, L.P. | Apparatus of communication utilizing wireless network devices |
RU184986U1 (en) * | 2017-11-29 | 2018-11-15 | федеральное государственное автономное образовательное учреждение высшего образования "Южный федеральный университет" | WAVEGUIDE MICROWAVE FILTER |
US10812136B1 (en) | 2019-12-02 | 2020-10-20 | At&T Intellectual Property I, L.P. | Surface wave repeater with controllable isolator and methods for use therewith |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2816271A (en) * | 1950-11-22 | 1957-12-10 | Gen Electric | Microwave mode converter |
US4598262A (en) * | 1983-06-08 | 1986-07-01 | Trw Inc. | Quasi-optical waveguide filter |
JPS6025303A (en) * | 1983-07-22 | 1985-02-08 | Fujitsu Ltd | Waveguide form polarized filter |
-
2000
- 2000-08-28 AT AT00118658T patent/ATE379852T1/en not_active IP Right Cessation
- 2000-08-28 ES ES00118658T patent/ES2296589T3/en not_active Expired - Lifetime
- 2000-08-28 DE DE60037247T patent/DE60037247T2/en not_active Expired - Lifetime
- 2000-08-28 EP EP00118658A patent/EP1184930B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
ATE379852T1 (en) | 2007-12-15 |
ES2296589T3 (en) | 2008-05-01 |
DE60037247D1 (en) | 2008-01-10 |
EP1184930A1 (en) | 2002-03-06 |
DE60037247T2 (en) | 2008-11-27 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1184930B1 (en) | Frequency selective surface waveguide filter | |
EP1675212A1 (en) | Filters and antennas for microwaves and millimetre waves, based on open-loop resonators and planar transmission lines | |
US5739796A (en) | Ultra-wideband photonic band gap crystal having selectable and controllable bad gaps and methods for achieving photonic band gaps | |
US4578656A (en) | Microwave microstrip filter with U-shaped linear resonators having centrally located capacitors coupled to ground | |
US4837535A (en) | Resonant wave filter | |
Martin et al. | Miniaturized coplanar waveguide stop band filters based on multiple tuned split ring resonators | |
US5539420A (en) | Multilayered, planar antenna with annular feed slot, passive resonator and spurious wave traps | |
US2751558A (en) | Radio frequency filter | |
US5136268A (en) | Miniature dual mode planar filters | |
CN110838610B (en) | One-dimensional filter array dielectric waveguide band-pass filter and design method thereof | |
US5499005A (en) | Transmission line device using stacked conductive layers | |
US4757285A (en) | Filter for short electromagnetic waves formed as a comb line or interdigital line filters | |
EP2924800B1 (en) | Resonator and filter having the same | |
US7030463B1 (en) | Tuneable electromagnetic bandgap structures based on high resistivity silicon substrates | |
Zhou et al. | A frequency selective rasorber with three transmission bands and three absorption bands | |
US4990870A (en) | Waveguide bandpass filter having a non-contacting printed circuit filter assembly | |
Öznazı et al. | A comparative investigation of SRR‐and CSRR‐based band‐reject filters: Simulations, experiments, and discussions | |
Kim et al. | CPW bandstop filter using slot-type SRRs | |
US4873501A (en) | Internal transmission line filter element | |
WO1994000892A1 (en) | A waveguide and an antenna including a frequency selective surface | |
US4885556A (en) | Circularly polarized evanescent mode radiator | |
CN112002975B (en) | Miniaturized equalizer based on double-helix resonator and defected ground structure | |
US6194981B1 (en) | Slot line band reject filter | |
Dean | Suspended substrate stripline filters for ESM applications | |
Rhodes | Suspended substrate filters and multiplexers |
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 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
|
AX | Request for extension of the european patent |
Free format text: AL;LT;LV;MK;RO;SI |
|
17P | Request for examination filed |
Effective date: 20020722 |
|
AKX | Designation fees paid |
Free format text: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP |
|
REF | Corresponds to: |
Ref document number: 60037247 Country of ref document: DE Date of ref document: 20080110 Kind code of ref document: P |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CH Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20071128 Ref country code: LI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20071128 Ref country code: NL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20071128 Ref country code: SE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20080228 |
|
NLV1 | Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act | ||
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FG2A Ref document number: 2296589 Country of ref document: ES Kind code of ref document: T3 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20071128 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: AT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20071128 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20071128 |
|
ET | Fr: translation filed | ||
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20071128 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: PT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20080428 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed |
Effective date: 20080829 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20080229 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MC Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20080831 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CY Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20071128 Ref country code: IE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20080828 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: ES Payment date: 20090828 Year of fee payment: 10 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20090909 Year of fee payment: 10 Ref country code: GB Payment date: 20090902 Year of fee payment: 10 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: IT Payment date: 20090831 Year of fee payment: 10 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20080828 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20100828 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST Effective date: 20110502 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20100828 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R119 Ref document number: 60037247 Country of ref document: DE Effective date: 20110301 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20110301 Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20100831 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20100828 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20090914 Year of fee payment: 10 |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FD2A Effective date: 20111019 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20100829 |