EP2924801B1 - Feed network and antenna - Google Patents
Feed network and antenna Download PDFInfo
- Publication number
- EP2924801B1 EP2924801B1 EP15165234.4A EP15165234A EP2924801B1 EP 2924801 B1 EP2924801 B1 EP 2924801B1 EP 15165234 A EP15165234 A EP 15165234A EP 2924801 B1 EP2924801 B1 EP 2924801B1
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- EP
- European Patent Office
- Prior art keywords
- radio frequency
- frequency transmission
- feed network
- transmission channels
- antenna
- 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.)
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P3/00—Waveguides; Transmission lines of the waveguide type
- H01P3/02—Waveguides; Transmission lines of the waveguide type with two longitudinal conductors
- H01P3/08—Microstrips; Strip lines
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P3/00—Waveguides; Transmission lines of the waveguide type
- H01P3/02—Waveguides; Transmission lines of the waveguide type with two longitudinal conductors
- H01P3/08—Microstrips; Strip lines
- H01P3/088—Stacked transmission lines
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
- H01Q1/526—Electromagnetic shields
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems
Definitions
- the present invention relates to the field of wireless communication, and in particular, to a feed network and an antenna.
- PIM Passive InterModulation
- PIM is a frequency interference caused by the non-linear characteristic of passive devices in an emission system.
- the nonlinearity of the passive devices brings about higher harmonic waves relative to a working frequency.
- the mixture of the harmonic waves and the working frequency generates a new group of frequencies, which is similar to the generation of stray signals when two or more frequencies in an active device are mixed in a non-linear device.
- US 3 098 983 A discloses a conventional short slot hybrid including an input port, two output ports, and a fourth port. The input port and the fourth port, and the two output ports, are respectively separated by metal interlayers.
- US 5 534 877 A discloses a dual polarized printed circuit antenna operating in dual frequency bands.
- a first array of radiating elements radiates at a first frequency
- a second array of radiating elements radiates at a second, different frequency.
- Separate power divider arrays are provided for each array of radiating elements, and the overall structure is provided in a stacked configuration.
- a typical communication antenna includes several radiation elements, a feed network and a reflector.
- the function of the feed network is to allocate signals from a single connector to all dipole antennas.
- the feed network usually includes controlled impedance transmission lines.
- FIG. 1 For feed networks of multiband antennas and smart antennas, a method for separating multiple radio frequency transmission channels in the prior art is shown in FIG. 1 .
- a thin metal interlayer 2 and a thin metal interlayer 6 are used to separate adjacent radio frequency transmission channel 7 and radio frequency transmission channel 8.
- the metal interlayers are connected through a screw 11 and a screw 12.
- the complex and excessive metal connections in the feed network in the prior art easily cause the PIM index of the antenna to be unstable and unreliable, and deteriorate the received total wide band power (RTWP, Received Total Wide band Power) or received signal strength indication (RSSI, Received Signal Strength Indication) of the system.
- RWP Received Total Wide band Power
- RSSI Received Signal Strength Indication
- Embodiments of the present invention provide a feed network and an antenna, so as to reduce the passive intermodulation interference, and improve the reliability, stability, and mobile communication quality of the antenna.
- An embodiment of the present invention provides a feed network, comprising: at least two separate radio frequency transmission channels, the at least two separate radio frequency transmission channels are separated by a single metal interlayer being on the same plane, one physical surface of the single or metal interlayer faces one of the at least two separate radio frequency transmission channels, and the other physical surface of the single metal interlayer faces another one of the at least two separate radio frequency transmission channels, wherein the radio frequency transmission channels are completely or partially closed except for two ends of a signal transmission direction, wherein the at least two separate radio frequency transmission channels are separated by a single metal interlayer, wherein the single metal interlayer comprises a hole, wherein a metal object is in the hole, one part of the metal object is in one of the at least two separate radio frequency transmission channels, and the other part is in another one of the at least two separate radio frequency transmission channels.
- An embodiment of the present invention provides an antenna, including a feed network provided in the foregoing embodiment of the present invention.
- the radio frequency transmission channels are separated by a metal interlayer without using any screw or rivet connection. Therefore, passive intermodulation interference caused by the metal connection is reduced, which increases the reliability and stability of the antenna, enhances the RTWP or RSSI index of the system, and improves the mobile communication quality.
- a feed network includes at least two separate radio frequency transmission channels, which are a radio frequency transmission channel 21 and a radio frequency transmission channel 22.
- Signal lines such as a signal line 23, a signal line 24, and a signal line 25, are included in each radio frequency transmission channel.
- At least one radio frequency transmission channel includes at least two signal lines.
- the signal line 23 and the signal line 24 are included in the radio frequency transmission channel 21.
- the at least two separate radio frequency transmission channels in the feed network are separated by a metal interlayer 26.
- the metal interlayer 26 has a certain thickness. Therefore, one physical surface of the metal interlayer is exposed to one of the at least two separate radio frequency transmission channels, and the other physical surface of the metal interlayer is exposed to another one of the at least two separate radio frequency transmission channels. For example, one physical surface 261 of the metal interlayer 26 is exposed to the radio frequency transmission channel 21 and the other physical surface 262 is exposed to the radio frequency transmission channel 22.
- the metal interlayer separates the radio frequency transmission channels without using any screw or rivet. Therefore, the feed network provided in the embodiment of the present invention is devoid of unstable PIM index caused by unreliable connection.
- an Example of the present invention provides another feed network.
- FIG. 4 is a schematic diagram of a cross section, orthogonal to a signal transmission direction, of a feed network according to the Example of the present invention.
- a metal interlayer includes several physically continuous metal interlayers, where a gap is between the several physically continuous metal interlayers.
- the metal interlayer 26 shown in FIG. 2 may be replaced by a metal interlayer 461 and a metal interlayer 462 that are physically continuous.
- the term "physically continuous" refers to that, although the metal interlayer 26 shown in FIG.
- the metal interlayer 461 and the metal interlayer 462 may be replaced by the metal interlayer 461 and the metal interlayer 462, the metal interlayer 461 and metal interlayer 462 are on the same plane, and may be regarded as one metal interlayer if a gap between the interlayers is filled. Because there is a gap between the interlayers, a signal line or signal may run through the gap, thereby implementing information exchange between two adjacent radio frequency transmission channels or coupling between two radio frequency transmission channels.
- the feed network shown in FIG. 4 has an alternative solution, which is shown in FIG. 5 .
- a metal interlayer 56 is still one metal interlayer, but different from the metal interlayer 26 shown in FIG. 2 , the metal interlayer 56 includes a hole (indicated by the dashed line in FIG. 5 ), and a signal line or signal may also run through the hole, thereby still implementing information exchange between two adjacent radio frequency transmission channels or coupling between two radio frequency transmission channels.
- a metal object such as a aluminum alloy object, a zinc alloy object, or a copper object may be set in the gap (or hole) of the feed network shown in FIG. 4 (or FIG. 5 ); alternatively, a dielectric part such as FR4 material, microwave sheet material, PS (polystyrene), PTFE (polytetrafluoroethylene), PE (polyethylene), PA66 (polyamide) or POM (polyformaldehyde) is set in the gap (or hole).
- One part of the metal object or dielectric part is in one of the two separate radio frequency transmission channels, and the other part is in the other one of the two separate radio frequency transmission channels.
- a metal object or dielectric part may be set in the gap, as shown in FIG. 6 .
- one part of a metal object or dielectric part 69 is in the radio frequency transmission channel 21, and the other part is in the radio frequency transmission channel 22.
- Setting a metal object or dielectric part in the hole of the feed network shown in FIG. 5 is similar to setting a metal object or dielectric part in the gap of the feed network in FIG. 4 , which is not described in detail.
- the feed network shown in FIG. 2 to FIG. 6 may be made into a closed or semi-closed structure.
- the radio frequency transmission channel except two ends of the signal transmission direction, is completely closed or partially closed.
- the radio frequency transmission channel 21 is partially closed, and the radio frequency transmission channel 22 is completely closed.
- the radio frequency transmission channels are separated by the metal interlayer without using any screw or rivet connection, thereby reducing passive intermodulation interference caused by the metal connection, increasing the reliability and stability of the antenna, enhancing the RTWP or RSSI index of the system, and improving the mobile communication quality.
- the metal interlayer is a continuous material layer, no extra size is needed for connection. Therefore, the feed network provided in the present invention has a compact structure, establishes a necessary technical foundation for implementing miniaturization of antennas, especially for miniaturization of multiband and multi-system antennas, reduces the volume and wind load of the antenna, and lowers the requirement on the installation environment of the antenna.
- the radio frequency transmission channels are separated by a metal interlayer without using any screw or rivet connection, thereby reducing passive intermodulation interference caused by the metal connection, increasing the reliability and stability of the antenna, enhancing the RTWP or RSSI index of the system, and improving the mobile communication quality.
- the metal interlayer is a continuous material layer, no extra size is needed for connection. Therefore, the feed network provided in the present invention has a compact structure, establishes a necessary technical foundation for implementing miniaturization of antennas, especially for miniaturization of multiband and multi-system antennas, reduces the volume and wind load of the antenna, and lowers the requirement on the installation environment of the antenna.
Description
- The present invention relates to the field of wireless communication, and in particular, to a feed network and an antenna.
- In wireless communication systems, as more and more voice and data information need to be transmitted within a fixed bandwidth, passive intermodulation (Passive InterModulation, PIM) becomes an important factor that limits the system capacity. PIM is a frequency interference caused by the non-linear characteristic of passive devices in an emission system. For example, in systems with great power and multiple channels, the nonlinearity of the passive devices brings about higher harmonic waves relative to a working frequency. The mixture of the harmonic waves and the working frequency generates a new group of frequencies, which is similar to the generation of stray signals when two or more frequencies in an active device are mixed in a non-linear device. When a stray intermodulation signal falls in a receiving band of a base station, sensitivity of a receiver decreases, thereby decreasing voice quality or a system carrier-to-interface ratio (C/I), and reducing the capacity of a communication system. The PIM is caused by a lot of factors, including poor mechanical contact of a feed network.
US 3 098 983 A discloses a conventional short slot hybrid including an input port, two output ports, and a fourth port. The input port and the fourth port, and the two output ports, are respectively separated by metal interlayers.
US 5 534 877 A discloses a dual polarized printed circuit antenna operating in dual frequency bands. A first array of radiating elements radiates at a first frequency, and a second array of radiating elements radiates at a second, different frequency. Separate power divider arrays are provided for each array of radiating elements, and the overall structure is provided in a stacked configuration. - A typical communication antenna includes several radiation elements, a feed network and a reflector. The function of the feed network is to allocate signals from a single connector to all dipole antennas. The feed network usually includes controlled impedance transmission lines.
- For feed networks of multiband antennas and smart antennas, a method for separating multiple radio frequency transmission channels in the prior art is shown in
FIG. 1 . In this method, a thin metal interlayer 2 and athin metal interlayer 6 are used to separate adjacent radiofrequency transmission channel 7 and radiofrequency transmission channel 8. The metal interlayers are connected through ascrew 11 and ascrew 12. - With rapid development of the mobile communication market, the number of communication networks increases significantly, and operators have an increasingly stronger demand on multiband and multi-system shared antenna, and antenna miniaturization. The structure of the feed network of a multiband antenna and smart antenna is complex, and is critical to the reliability of the entire antenna. Therefore, a stable and reliable feed network with a compact structure is a necessary condition for ensuring multiband and multi-antenna performance.
- However, the complex and excessive metal connections in the feed network in the prior art easily cause the PIM index of the antenna to be unstable and unreliable, and deteriorate the received total wide band power (RTWP, Received Total Wide band Power) or received signal strength indication (RSSI, Received Signal Strength Indication) of the system.
- Embodiments of the present invention provide a feed network and an antenna, so as to reduce the passive intermodulation interference, and improve the reliability, stability, and mobile communication quality of the antenna.
- An embodiment of the present invention provides a feed network, comprising: at least two separate radio frequency transmission channels, the at least two separate radio frequency transmission channels are separated by a single metal interlayer being on the same plane, one physical surface of the single or metal interlayer faces one of the at least two separate radio frequency transmission channels, and the other physical surface of the single metal interlayer faces another one of the at least two separate radio frequency transmission channels, wherein the radio frequency transmission channels are completely or partially closed except for two ends of a signal transmission direction, wherein the at least two separate radio frequency transmission channels are separated by a single metal interlayer, wherein the single metal interlayer comprises a hole, wherein a metal object is in the hole, one part of the metal object is in one of the at least two separate radio frequency transmission channels, and the other part is in another one of the at least two separate radio frequency transmission channels. An embodiment of the present invention provides an antenna, including a feed network provided in the foregoing embodiment of the present invention.
- In the feed network provided in the embodiment of the present invention, the radio frequency transmission channels are separated by a metal interlayer without using any screw or rivet connection. Therefore, passive intermodulation interference caused by the metal connection is reduced, which increases the reliability and stability of the antenna, enhances the RTWP or RSSI index of the system, and improves the mobile communication quality.
- To illustrate the technical solutions in the embodiments of the present invention more clearly, the accompanying drawings required for describing the embodiments are briefly described in the following. Apparently, the accompanying drawings in the following description merely show some embodiments of the present invention, and persons of ordinary skill in the art may still derive other drawings from the accompanying drawings without creative efforts.
-
FIG. 1 is a cross-sectional schematic diagram of a feed network according to the prior art; -
FIG. 2 is a three-dimensional schematic diagram of a feed network structure according to Embodiment 1 of the present invention; -
FIG. 3 is a schematic diagram of a cross section, orthogonal to a signal transmission direction, of the feed network inFIG. 2 ; -
FIG. 4 is a schematic diagram of a cross section, orthogonal to a signal transmission direction, of a feed network according to an Example2 of the present invention; -
FIG. 5 is a schematic diagram of a cross section, orthogonal to a signal transmission direction, of a feed network according to Embodiment 2 of the present invention; -
FIG. 6 is a schematic diagram of a cross section, orthogonal to a signal transmission direction, of a feed network according to Embodiment 3 of the present invention; -
FIG. 7 is a schematic diagram of a cross section, orthogonal to a signal transmission direction, of a feed network according toEmbodiment 4 of the present invention; and -
FIG. 8 is a schematic assembly diagram of a multiband antenna according to an embodiment of the present invention. - Referring to
FIG. 2, FIG. 2 is a three-dimensional schematic diagram of a feed network structure according to Embodiment 1 of the present invention, andFIG. 3 is a schematic diagram of across section 27, orthogonal to a signal transmission direction, of the feed network inFIG. 2 . - In the embodiment shown in
FIG. 2 or FIG. 3 , a feed network includes at least two separate radio frequency transmission channels, which are a radiofrequency transmission channel 21 and a radiofrequency transmission channel 22. Signal lines, such as asignal line 23, asignal line 24, and asignal line 25, are included in each radio frequency transmission channel. At least one radio frequency transmission channel includes at least two signal lines. For example, thesignal line 23 and thesignal line 24 are included in the radiofrequency transmission channel 21. - Unlike the prior art in which two metal interlayers are connected through rivets or screws, in the embodiment of the present invention, the at least two separate radio frequency transmission channels in the feed network are separated by a
metal interlayer 26. In the embodiment of the present invention, themetal interlayer 26 has a certain thickness. Therefore, one physical surface of the metal interlayer is exposed to one of the at least two separate radio frequency transmission channels, and the other physical surface of the metal interlayer is exposed to another one of the at least two separate radio frequency transmission channels. For example, onephysical surface 261 of themetal interlayer 26 is exposed to the radiofrequency transmission channel 21 and the otherphysical surface 262 is exposed to the radiofrequency transmission channel 22. - The metal interlayer separates the radio frequency transmission channels without using any screw or rivet. Therefore, the feed network provided in the embodiment of the present invention is devoid of unstable PIM index caused by unreliable connection.
- In consideration of information exchange required between two adjacent radio frequency transmission channels or coupling required between two radio frequency transmission channels, the exchange or coupling being either in a wireless manner or a wired manner, an Example of the present invention provides another feed network.
- Referring to
FIG. 4, FIG. 4 is a schematic diagram of a cross section, orthogonal to a signal transmission direction, of a feed network according to the Example of the present invention. In this Example, a metal interlayer includes several physically continuous metal interlayers, where a gap is between the several physically continuous metal interlayers. For example, in the feed network shown inFIG. 4 , themetal interlayer 26 shown inFIG. 2 may be replaced by ametal interlayer 461 and ametal interlayer 462 that are physically continuous. The term "physically continuous" refers to that, although themetal interlayer 26 shown inFIG. 2 may be replaced by themetal interlayer 461 and themetal interlayer 462, themetal interlayer 461 andmetal interlayer 462 are on the same plane, and may be regarded as one metal interlayer if a gap between the interlayers is filled. Because there is a gap between the interlayers, a signal line or signal may run through the gap, thereby implementing information exchange between two adjacent radio frequency transmission channels or coupling between two radio frequency transmission channels. - The feed network shown in
FIG. 4 has an alternative solution, which is shown inFIG. 5 . In a feed network shown inFIG. 5 , ametal interlayer 56 is still one metal interlayer, but different from themetal interlayer 26 shown inFIG. 2 , themetal interlayer 56 includes a hole (indicated by the dashed line inFIG. 5 ), and a signal line or signal may also run through the hole, thereby still implementing information exchange between two adjacent radio frequency transmission channels or coupling between two radio frequency transmission channels. - In order to adjust an electrical property of a signal, for example, to adjust a resonance frequency, a metal object such as a aluminum alloy object, a zinc alloy object, or a copper object may be set in the gap (or hole) of the feed network shown in
FIG. 4 (or FIG. 5 ); alternatively, a dielectric part such as FR4 material, microwave sheet material, PS (polystyrene), PTFE (polytetrafluoroethylene), PE (polyethylene), PA66 (polyamide) or POM (polyformaldehyde) is set in the gap (or hole). One part of the metal object or dielectric part is in one of the two separate radio frequency transmission channels, and the other part is in the other one of the two separate radio frequency transmission channels. - Taking the feed network shown in
FIG. 4 as an example, a metal object or dielectric part may be set in the gap, as shown inFIG. 6 . In the feed network shown inFIG. 6 , one part of a metal object ordielectric part 69 is in the radiofrequency transmission channel 21, and the other part is in the radiofrequency transmission channel 22. Setting a metal object or dielectric part in the hole of the feed network shown inFIG. 5 is similar to setting a metal object or dielectric part in the gap of the feed network inFIG. 4 , which is not described in detail. - To protect signals in the radio frequency transmission channel from interference or prevent signals in the radio frequency transmission channel from interfering external signals, for example, generating electromagnetic leakage, the feed network shown in
FIG. 2 to FIG. 6 may be made into a closed or semi-closed structure. For example, the radio frequency transmission channel, except two ends of the signal transmission direction, is completely closed or partially closed. As shown inFIG. 7 , the radiofrequency transmission channel 21 is partially closed, and the radiofrequency transmission channel 22 is completely closed. - In the feed network provided in the embodiment of the present invention, the radio frequency transmission channels are separated by the metal interlayer without using any screw or rivet connection, thereby reducing passive intermodulation interference caused by the metal connection, increasing the reliability and stability of the antenna, enhancing the RTWP or RSSI index of the system, and improving the mobile communication quality. Meanwhile, because the metal interlayer is a continuous material layer, no extra size is needed for connection. Therefore, the feed network provided in the present invention has a compact structure, establishes a necessary technical foundation for implementing miniaturization of antennas, especially for miniaturization of multiband and multi-system antennas, reduces the volume and wind load of the antenna, and lowers the requirement on the installation environment of the antenna.
- The present invention also provides a wireless communication system antenna using the foregoing feed network, for example, a multiband antenna, a dual-polarized antenna, a long term evolution (Long Term Evolution, LTE) antenna, or a smart antenna. Referring to
FIG. 8, FIG. 8 is an assembly schematic view of a multiband antenna according to an embodiment of the present invention. To facilitate description, only the parts related to the present invention are shown. The antenna includes several radiation/receivingunits 801, afeed network 803 provided in the embodiment of the present invention, acalibration network 804 and adielectric part substrate 805. The radiation/receivingunits 801 are configured to radiate wireless signals to the outside or receive external wireless signals. Thefeed network 803 may be printed on thedielectric part substrate 805 and configured to allocate signals from a single connector to each of the radiation/receivingunits 801. Thecalibration network 804 is configured to perform real-time calibration on an amplitude and a phase of each radiation/receivingunit 801 during operation of the antenna system. - In the feed network provided in the present invention, the radio frequency transmission channels are separated by a metal interlayer without using any screw or rivet connection, thereby reducing passive intermodulation interference caused by the metal connection, increasing the reliability and stability of the antenna, enhancing the RTWP or RSSI index of the system, and improving the mobile communication quality. Meanwhile, because the metal interlayer is a continuous material layer, no extra size is needed for connection. Therefore, the feed network provided in the present invention has a compact structure, establishes a necessary technical foundation for implementing miniaturization of antennas, especially for miniaturization of multiband and multi-system antennas, reduces the volume and wind load of the antenna, and lowers the requirement on the installation environment of the antenna.
Claims (4)
- A feed network, comprising: at least two separate radio frequency transmission channels (21, 22),
the at least two separate radio frequency transmission channels (21, 22) are separated by a single metal interlayer (26, 56) being on the same plane,
one physical surface of the single metal interlayer (26, 56) faces one of the at least two separate radio frequency transmission channels (21, 22), and the other physical surface of the single metal interlayer (26, 56) faces another one of the at least two separate radio frequency transmission channels (21, 22),
wherein the radio frequency transmission channels (21, 22) are completely or partially closed except for two ends of a signal transmission direction,
wherein the at least two separate radio frequency transmission channels (21, 22) are separated by a single metal interlayer (56), wherein the single metal interlayer (56) comprises a hole; characterized in that a metal object is in the hole, one part of the metal object is in one of the at least two separate radio frequency transmission channels (21, 22), and the other part is in another one of the at least two separate radio frequency transmission channels (21, 22). - The feed network according to claim 1, wherein at least one of the radio frequency transmission channels (21, 22) comprises at least two signal lines.
- The feed network according to claim 1, wherein each radio frequency transmission channels (21, 22) comprises at least one signal line.
- An antenna, characterized in that the antenna comprises the feed network according to any one of claims 1 to 3.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201010215927.9A CN102315518B (en) | 2010-06-29 | 2010-06-29 | Feed network and antenna |
EP11780211.6A EP2573865A4 (en) | 2010-06-29 | 2011-05-12 | Feed network and antenna |
PCT/CN2011/073978 WO2011140990A1 (en) | 2010-06-29 | 2011-05-12 | Feed network and antenna |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11780211.6A Division EP2573865A4 (en) | 2010-06-29 | 2011-05-12 | Feed network and antenna |
Publications (2)
Publication Number | Publication Date |
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EP2924801A1 EP2924801A1 (en) | 2015-09-30 |
EP2924801B1 true EP2924801B1 (en) | 2018-09-26 |
Family
ID=44913959
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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EP11780211.6A Ceased EP2573865A4 (en) | 2010-06-29 | 2011-05-12 | Feed network and antenna |
EP15165234.4A Active EP2924801B1 (en) | 2010-06-29 | 2011-05-12 | Feed network and antenna |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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EP11780211.6A Ceased EP2573865A4 (en) | 2010-06-29 | 2011-05-12 | Feed network and antenna |
Country Status (4)
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EP (2) | EP2573865A4 (en) |
CN (1) | CN102315518B (en) |
CA (1) | CA2803456C (en) |
WO (1) | WO2011140990A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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US20180147812A1 (en) | 2016-11-28 | 2018-05-31 | Johns Manville | Roofing membrane for mitigating passive intermodulation |
SE542018C2 (en) * | 2018-06-08 | 2020-02-11 | Cellmax Tech Ab | An antenna arrangement, a radiating element and a method of manufacturing the radiating element |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2894216A (en) * | 1956-06-11 | 1959-07-07 | Bell Telephone Labor Inc | Non-reciprocal wave transmission |
US3098983A (en) * | 1960-06-29 | 1963-07-23 | Merrimac Res And Dev Inc | Wideband microwave hybrid |
SE441640B (en) * | 1980-01-03 | 1985-10-21 | Stiftelsen Inst Mikrovags | PROCEDURE AND DEVICE FOR HEATING BY MICROVAGS ENERGY |
US4818964A (en) * | 1986-04-28 | 1989-04-04 | Hughes Aircraft Company | Switchable multi-power-level short slot waveguide hybrid coupler |
CN88105654A (en) * | 1988-01-11 | 1988-12-07 | 国防科学技术大学 | Wavequide double orthogonal moulding bridge |
CA2030963C (en) * | 1989-12-14 | 1995-08-15 | Robert Michael Sorbello | Orthogonally polarized dual-band printed circuit antenna employing radiating elements capacitively coupled to feedlines |
GB2277832B (en) * | 1993-04-27 | 1997-01-15 | British Aerospace | Thin film multi-layer interconnect |
JP3059336B2 (en) * | 1994-04-06 | 2000-07-04 | 三菱電機株式会社 | Antenna device and mobile communication device |
JP3864093B2 (en) * | 2002-01-10 | 2006-12-27 | シャープ株式会社 | Printed circuit board, radio wave receiving converter and antenna device |
JP3784807B2 (en) * | 2004-02-24 | 2006-06-14 | 株式会社エヌ・ティ・ティ・ドコモ | Microstrip antenna |
-
2010
- 2010-06-29 CN CN201010215927.9A patent/CN102315518B/en active Active
-
2011
- 2011-05-12 CA CA2803456A patent/CA2803456C/en active Active
- 2011-05-12 EP EP11780211.6A patent/EP2573865A4/en not_active Ceased
- 2011-05-12 WO PCT/CN2011/073978 patent/WO2011140990A1/en active Application Filing
- 2011-05-12 EP EP15165234.4A patent/EP2924801B1/en active Active
Non-Patent Citations (1)
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Also Published As
Publication number | Publication date |
---|---|
EP2573865A4 (en) | 2013-06-05 |
CN102315518B (en) | 2014-03-12 |
WO2011140990A1 (en) | 2011-11-17 |
CA2803456A1 (en) | 2011-11-17 |
EP2924801A1 (en) | 2015-09-30 |
CA2803456C (en) | 2018-01-09 |
CN102315518A (en) | 2012-01-11 |
EP2573865A1 (en) | 2013-03-27 |
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