WO2006079994A1 - Radiation enhanced cavity antenna with dielectric - Google Patents

Radiation enhanced cavity antenna with dielectric Download PDF

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Publication number
WO2006079994A1
WO2006079994A1 PCT/IB2006/050296 IB2006050296W WO2006079994A1 WO 2006079994 A1 WO2006079994 A1 WO 2006079994A1 IB 2006050296 W IB2006050296 W IB 2006050296W WO 2006079994 A1 WO2006079994 A1 WO 2006079994A1
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WO
WIPO (PCT)
Prior art keywords
dielectric substrate
radiation
metalized
holes
antenna
Prior art date
Application number
PCT/IB2006/050296
Other languages
French (fr)
Inventor
Guang Hua
Wei Hong
Original Assignee
Southeast University
Koninklijke Philips Electronics N.V.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Southeast University, Koninklijke Philips Electronics N.V. filed Critical Southeast University
Publication of WO2006079994A1 publication Critical patent/WO2006079994A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/10—Resonant slot antennas
    • H01Q13/18—Resonant slot antennas the slot being backed by, or formed in boundary wall of, a resonant cavity ; Open cavity antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/22—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using a secondary device in the form of a single substantially straight conductive element

Definitions

  • the present invention relates to an antenna used for the electronic devices such as wireless communication device, radar, electronic navigation device and electronic countermeasures device and particularly, to a radiation-enhanced cavity antenna with a dielectric substrate.
  • the features of future wireless communication systems such as distributed access, broadband, high transmission rate and high moving speed, place more strict requirements on an antenna and its corresponding RF front-end than before.
  • the antenna has become an important part of system design, and the research thereon involves transmission properties of electric wave, local environmental conditions, construction of the communication system, signal- to- noise ratio (signal-to-interference ratio), bandwidth property, adaptability of the mechanical structure and the manufacturing technique of the antenna itself, the convenience for use and the like.
  • the existing cavity-backed antenna has the advantages of high gain, wide bandwidth, low side lobe and the like, but it is large in size, and even its short back cavity is rather large; moreover, the cavity-backed antenna is inconvenient to be integrated with other high-frequency devices because of the metal cavity body attached to its back, thus being kept from the applications requiring small volume, light weight and high integration.
  • the technical problem that the present invention addresses to is to provide a radiation-enhanced cavity antenna with a dielectric substrate, which has the features of wide bandwidth, high gain, small volume and light weight.
  • the present invention can be used to produce an antenna with dual polarization electrical performance, and facilitate the integration with a high-frequency circuit and the formation of a desired antenna array.
  • the radiation-enhanced cavity antenna with a dielectric substrate of the present invention comprises a ground plate, a radiation-enhanced cavity, a feed network and an antenna director attached onto the feed network, wherein the radiation-enhanced cavity having a high-frequency dielectric substrate is located between the ground plate and the feed network, and the dielectric substrate has multiple metalized through holes enclosing and surrounding a certain area.
  • a cavity-wall metal strip with a circle of metalized through holes distributed uniformly thereon for enclosing and surrounding a certain area is laid correspondingly on the upper and lower faces of the high-frequency dielectric substrate respectively.
  • the distance between the metalized through holes enables the metalized through holes to at least partially reflect the electromagnetic wave transmitted in the dielectric substrate.
  • the distance is substantially equal to or smaller than a quarter of the wavelength of the electromagnetic wave transmitted in the dielectric substrate.
  • the distance between the metalized through holes is substantially about one eighth of the wavelength of the electromagnetic wave transmitted therethrough.
  • the enclosed area of the radiation-enhanced cavity surrounded by the cavity-wall metal strip is rectangular, or a circular area or a non-fully regular closed area.
  • the present invention also provides a method for manufacturing the radiation- enhanced cavity antenna with a dielectric substrate, which comprising; disposing multiple metalized through holes enclosing and surrounding a certain area in a dielectric substrate; in an embodiment of the present invention, correspondingly laying a cavity-wall metal strip for enclosing and surrounding a certain area on the upper and lower faces of the high-frequency dielectric substrate respectively; uniformly distributing multiple metalized through holes on each cavity-wall metal strip, wherein the distance between the metalized through holes enable the metalized through holes to at least partially reflect the electromagnetic wave transmitted in the dielectric substrate, preferably being substantially equal to or smaller than a quarter of the wavelength of the electromagnetic wave transmitted in the dielectric substrate; and placing the radiation-enhanced cavity between a ground plate and a feed network, and attaching an antenna director onto the feed network.
  • the radiation-enhanced cavity antenna with a dielectric substrate of the present invention achieves a radiation-enhanced cavity with the features of high Q value and low loss.
  • the radiation-enhanced cavity forms a structure similar to a resonant cavity, and thereby forms a desired radiation model between the radiation-enhanced cavity body and the excitation slot and antenna director, so that the same phase superposition of the forward transmission wave and the backward resonant wave achieves high gain and directionality of the antenna radiation.
  • the components constituting the antenna of the present invention are produced on a dielectric substrate by the printed circuit and have the properties of simple structure and small volume, thus the radiation-enhanced cavity antenna is easy to be integrated with the microwave circuit or the millimeter-wave circuit.
  • the dielectric constant of the dielectric substrate is higher than that of the air, so the thickness and transverse dimension of the dielectric substrate are reduced.
  • the metalized through holes in the structure may be accomplished at the same time when making a microwave circuit, and the technology is simple.
  • the material of the substrate of the antenna in the present invention is the same as that of the microwave or millimeter- wave front-end, so that the phenomena of the contact electricity between the heterogeneous metals is avoided, thus enhancing the capability of the third-order intermodulation.
  • the antenna of the present invention has the advantages of a wide bandwidth, high efficiency, high gain, a small pattern of the back lobe of the antenna pattern and a good radiation property, and can be widely applied to the electronic devices such as the wireless communication device, radar, electronic navigation device and electronic countermeasures device.
  • FIG. 1 is a schematic view of the structure of a radiation-enhanced cavity antenna with a dielectric substrate according to an embodiment of the present invention
  • FIG. 2 is a schematic view of a ground plate according to an embodiment of the present invention.
  • FIG.3 is a rear view of the ground plate shown in FIG. 2;
  • FIG. 4 is a schematic view of the structure of a radiation-enhanced cavity according to an embodiment of the present invention.
  • FIG. 5 is a rear view of the radiation-enhanced cavity of the present invention shown in FIG. 4;
  • the ground plate 1 includes three portions: a high-frequency dielectric substrate 11, a cavity-wall metal strip 12 and the metal ground plate 13, wherein the high- frequency dielectric substrate 11 is located in the middle part, with the enclosed cavity- wall metal strip 12 on its upper part and the metal ground plate 13 under its lower part, and the cavity- wall metal strip 12 is connected to the metal ground plate 13 through the metalized through holes, so that the ground plate 1 is integrally constituted by the high- frequency dielectric substrate 11, the cavity-wall metal strip 12 and metal floor 13, which can be fixed by adhesion or mechanical connection.
  • the metalized through holes are uniformly distributed on the cavity-wall metal strip 12, and penetrate the metal ground plate 13. It can be seen that the metalized through holes shown in FIG. 2 correspond to those shown in FIG.3 one by one.
  • FIG. 4 illustrates the structure of a radiation-enhanced cavity described in an embodiment of the present invention
  • FIG. 5 is a rear view of the radiation-enhanced cavity shown in FIG. 4.
  • the cavity- wall metal strip (42,43) for enclosing and surrounding a certain area is correspondingly laid on the upper and lower sides of the high-frequency dielectric substrate 41 respectively (as shown in FIG. 5).
  • the metalized through holes 44 are uniformly distributed on the cavity-wall metal strips.
  • the distance between the metalized through holes should be about a quarter of the wavelength of electromagnetic wave transmitted therethrough, and preferably smaller than one eighth of the wavelength of electromagnetic wave transmitted therethrough, so as to constitute a structure of a resonant cavity.
  • the cavity- wall metal strip (42, 43) also has another circle of uniformly distributed metalized through holes added on the outer side of the cavity-wall metal strip (not shown in FIG. 4 and 5). The distance between them also should be about a quarter of the wavelength of electromagnetic wave transmitted therethrough, and preferably smaller than one eighth of the wavelength of electromagnetic wave transmitted therethrough. It should be noted that each metalized through hole of the outer side circle should be located correspondingly between every two holes of the inner circle. Such arrangement can further reduce the electromagnetic leakage.
  • the area of the radiation- enhanced cavity enclosed by the cavity- wall metal strip (42, 43) is rectangular. However, it also can be enclosed into a circular area or a non-fully regular closed area.
  • cavity-wall metal strip 12 in the ground plate unit shown in FIG. 2 should also be a rectangular, circular or not fully regular closed area correspondingly.
  • FIG. 6 is a specific embodiment of the feed network in an embodiment of the present invention
  • FIG. 7 is a rear view of the feed network embodiment of the present invention shown in FIG. 6. It can be seen from FIG.6 and FIG.7 that the feed network of the present invention is formed by overlapping the high-frequency dielectric substrate 21, the excitation circuit 22 attached to the upper surface of the high-frequency dielectric substrate 21 and the metal coupling plate 23 attached to the lower surface of the high- frequency dielectric substrate 21.
  • FIG. 6 shows two sets of excitation circuits, which actually constitute a dipole antenna.
  • the openings of the two excitation circuits are referred to as excitation slots, and its arrangement requires the two excitation slots to be orthogonal to each other, so that there is no interference between the two sets of excitation circuits.
  • excitation slots the two excitation slots to be orthogonal to each other, so that there is no interference between the two sets of excitation circuits.
  • Only one set excitation circuit is arranged, it will be a typical monopole antenna, which still can solve the technical problems that the present invention addresses.
  • a coupling slot 231 is carved on the metal coupling plate 23 attached to the lower surface of the high-frequency dielectric substrate 21.
  • the coupling slot is formed after the metal coating layer of the area is removed from the metal coupling plate 23.
  • FIG.7 shows a cross coupling slot, which also can be strip-shaped, with the length of a half of the guide wavelength.
  • the coupling slot 231 just faces the radiation-enhanced cavity located therebelow, functions to couple the electric signal introduced by a microstrip excitation circuit into the dielectric resonant cavity and to radiate the resonant signal within the dielectric resonant cavity into space.
  • the radiation-enhanced cavity is a resonant cavity in a circular or square array formed by making a series of metal through holes on a high-frequency dielectric substrate.
  • the dielectric substrate may be implemented to be a multilayer structure with a circular or square metal guide strip left between the layers for the metalized through holes to pass through.
  • a support material may be disposed between the excitation circuit 22 of the feed network and the antenna director, such as the low dielectric constant foamed material or other support materials, with metal sheets distributed thereon.
  • the present invention further provides a method for manufacturing the radiation-enhanced cavity antenna with a dielectric substrate, and particularly for manufacturing the radiation-enhanced cavity.
  • the method comprising: correspondingly laying a cavity-wall metal strip for enclosing and surrounding a certain area on the upper and lower faces of the high-frequency dielectric substrate respectively; uniformly distributing multiple metalized through holes on each cavity-wall metal strip, wherein the distance between the metalized through holes is about a quarter of the wavelength of electromagnetic wave transmitted therethrough; and placing the radiation-enhanced cavity between a ground plate and a feed network and attaching an antenna director onto the feed network.
  • the detailed step is disposing the low dielectric constant foamed material or other support material, with metal sheets distributed thereon, between the feed network and the antenna director, for the low dielectric constant foamed material can be used for supporting and fixing the metal sheets, of course, the dielectric bolts can also be used for fixation.
  • the high dielectric constant material will affect the bandwidth and radiation of an antenna, which should be avoided if possible, so that the low dielectric constant foamed material is employed.
  • the foamed dielectric has low specific gravity, it is easy to merge lots of air, thus lowering the average dielectric constant. Distributing the metal sheets onto the low dielectric constant foamed material which acting as the antenna director is also a way to enhance radiation and increase bandwidth.
  • FIG. 8-11 illustrate the test result of the radiation-enhanced cavity antenna with a dielectric substrate of the present invention accomplished in the 2.4Ghz. It is selected that the diameter of the metalized through holes of the radiation-enhanced cavity is 0.5 mm, the distance between the through holes is 2.5 mm, and the dielectric constant of the dielectric substrate is 2.65.
  • FIG. 8 illustrates an antenna pattern of the radiation-enhanced cavity antenna with a dielectric substrate according to an embodiment of the present invention. There are two curves in FIG. 8, wherein the thinner dashed line represents E-plane pattern, and the thicker one represents H-plane pattern. It can be seen that the patterns are ideal.
  • FIG. 9 illustrates the antenna standing-wave feature of the radiation-enhanced cavity dipole antenna with a dielectric substrate according to an embodiment of the present invention, wherein the real line and the dashed line represent respectively the standing wave features of two dual-polarized antennae. As seen from FIG. 9, the corresponding bandwidth below 10 decibel is about 700 MHz.
  • FIG. 10 is a test graph of the standing wave of the radiation-enhanced cavity antenna with a dielectric substrate according to an embodiment of the present invention, wherein four dots (1, 2, 3, 4) are marked, and the bandwidth from dot 1 to dot 3 has been already wider than 0.5 G, i.e. 500 M.
  • the corresponding bandwidth below 10 decibel is 700 MHz, and the relative bandwidth is 29%.
  • This indicates that the effect of the antenna of the present invention can be regarded as an ultrawideband antenna (the bandwidth of an ultrawideband antenna defined as 20%).
  • FIG. 11 is a test graph of the dual-polarization isolation employing the radiation- enhanced cavity dipole antenna with a dielectric substrate of an embodiment of the present invention. It can be seen that the curve is below - 20 decibel, indicating that the isolation between the two ports is fine and the interference between each other is quite small.

Abstract

The present invention relates to a radiation-enhanced cavity antenna with a dielectric substrate and the manufacturing method thereof. The antenna comprises a ground plate, a radiation-enhanced cavity, a feed network and an antenna director attached onto the feed network, wherein the radiation-enhanced cavity having a dielectric substrate is located between the ground plate and the feed network; the dielectric substrate has multiple metalized through holes enclosing and surrounding a certain area; and the distance between the metalized through holes enables the metalized through holes to at least partially reflect the electromagnetic wave transmitted in the dielectric substrate. The present invention has accomplished the radiation-enhanced cavity with the features of high Q value and low loss based on the dielectric substrate, and the radiation-enhanced cavity is produced by the printed circuit and has a simple structure and small size, and thus it is easy to be integrated. The present invention has the advantages of a wide bandwidth, high efficiency, high gain, a small back lobe of the antenna pattern and a preferred radiation property, and can be widely applied to the electronic devices such as the wireless communication device, radar, electronic navigation device and the electronic countermeasures device.

Description

RADIATION ENHANCED CAVITY ANTENNA WITH DIELECTRIC
FIELD OF THE INVENTION
The present invention relates to an antenna used for the electronic devices such as wireless communication device, radar, electronic navigation device and electronic countermeasures device and particularly, to a radiation-enhanced cavity antenna with a dielectric substrate.
BACKGROUND OF THE INVENTION The features of future wireless communication systems, such as distributed access, broadband, high transmission rate and high moving speed, place more strict requirements on an antenna and its corresponding RF front-end than before. The antenna has become an important part of system design, and the research thereon involves transmission properties of electric wave, local environmental conditions, construction of the communication system, signal- to- noise ratio (signal-to-interference ratio), bandwidth property, adaptability of the mechanical structure and the manufacturing technique of the antenna itself, the convenience for use and the like. The existing cavity-backed antenna has the advantages of high gain, wide bandwidth, low side lobe and the like, but it is large in size, and even its short back cavity is rather large; moreover, the cavity-backed antenna is inconvenient to be integrated with other high-frequency devices because of the metal cavity body attached to its back, thus being kept from the applications requiring small volume, light weight and high integration.
OBJECT AND SUMMARY OF THE INVENTION The technical problem that the present invention addresses to is to provide a radiation-enhanced cavity antenna with a dielectric substrate, which has the features of wide bandwidth, high gain, small volume and light weight. The present invention can be used to produce an antenna with dual polarization electrical performance, and facilitate the integration with a high-frequency circuit and the formation of a desired antenna array. The radiation-enhanced cavity antenna with a dielectric substrate of the present invention comprises a ground plate, a radiation-enhanced cavity, a feed network and an antenna director attached onto the feed network, wherein the radiation-enhanced cavity having a high-frequency dielectric substrate is located between the ground plate and the feed network, and the dielectric substrate has multiple metalized through holes enclosing and surrounding a certain area. In an embodiment of the present invention, a cavity-wall metal strip with a circle of metalized through holes distributed uniformly thereon for enclosing and surrounding a certain area is laid correspondingly on the upper and lower faces of the high-frequency dielectric substrate respectively. The distance between the metalized through holes enables the metalized through holes to at least partially reflect the electromagnetic wave transmitted in the dielectric substrate. Preferably, the distance is substantially equal to or smaller than a quarter of the wavelength of the electromagnetic wave transmitted in the dielectric substrate.
According to the specific embodiments of the present invention, the distance between the metalized through holes is substantially about one eighth of the wavelength of the electromagnetic wave transmitted therethrough.
According to the specific embodiments of the present invention, the enclosed area of the radiation-enhanced cavity surrounded by the cavity-wall metal strip is rectangular, or a circular area or a non-fully regular closed area.
The present invention also provides a method for manufacturing the radiation- enhanced cavity antenna with a dielectric substrate, which comprising; disposing multiple metalized through holes enclosing and surrounding a certain area in a dielectric substrate; in an embodiment of the present invention, correspondingly laying a cavity-wall metal strip for enclosing and surrounding a certain area on the upper and lower faces of the high-frequency dielectric substrate respectively; uniformly distributing multiple metalized through holes on each cavity-wall metal strip, wherein the distance between the metalized through holes enable the metalized through holes to at least partially reflect the electromagnetic wave transmitted in the dielectric substrate, preferably being substantially equal to or smaller than a quarter of the wavelength of the electromagnetic wave transmitted in the dielectric substrate; and placing the radiation-enhanced cavity between a ground plate and a feed network, and attaching an antenna director onto the feed network.
Based on the dielectric substrate, the radiation-enhanced cavity antenna with a dielectric substrate of the present invention achieves a radiation-enhanced cavity with the features of high Q value and low loss. The radiation-enhanced cavity forms a structure similar to a resonant cavity, and thereby forms a desired radiation model between the radiation-enhanced cavity body and the excitation slot and antenna director, so that the same phase superposition of the forward transmission wave and the backward resonant wave achieves high gain and directionality of the antenna radiation.
Since the components constituting the antenna of the present invention are produced on a dielectric substrate by the printed circuit and have the properties of simple structure and small volume, thus the radiation-enhanced cavity antenna is easy to be integrated with the microwave circuit or the millimeter-wave circuit. The dielectric constant of the dielectric substrate is higher than that of the air, so the thickness and transverse dimension of the dielectric substrate are reduced. The metalized through holes in the structure may be accomplished at the same time when making a microwave circuit, and the technology is simple.
The material of the substrate of the antenna in the present invention is the same as that of the microwave or millimeter- wave front-end, so that the phenomena of the contact electricity between the heterogeneous metals is avoided, thus enhancing the capability of the third-order intermodulation.
The antenna of the present invention has the advantages of a wide bandwidth, high efficiency, high gain, a small pattern of the back lobe of the antenna pattern and a good radiation property, and can be widely applied to the electronic devices such as the wireless communication device, radar, electronic navigation device and electronic countermeasures device.
Other objects and achievements of the present invention will be apparent, and the present invention will be fully understood through the following descriptions of the present invention in conjunction with the accompanying figures and claims.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic view of the structure of a radiation-enhanced cavity antenna with a dielectric substrate according to an embodiment of the present invention;
FIG. 2 is a schematic view of a ground plate according to an embodiment of the present invention;
FIG.3 is a rear view of the ground plate shown in FIG. 2;
FIG. 4 is a schematic view of the structure of a radiation-enhanced cavity according to an embodiment of the present invention;
FIG. 5 is a rear view of the radiation-enhanced cavity of the present invention shown in FIG. 4;
Figure imgf000005_0001
In FIG.2, the ground plate 1 includes three portions: a high-frequency dielectric substrate 11, a cavity-wall metal strip 12 and the metal ground plate 13, wherein the high- frequency dielectric substrate 11 is located in the middle part, with the enclosed cavity- wall metal strip 12 on its upper part and the metal ground plate 13 under its lower part, and the cavity- wall metal strip 12 is connected to the metal ground plate 13 through the metalized through holes, so that the ground plate 1 is integrally constituted by the high- frequency dielectric substrate 11, the cavity-wall metal strip 12 and metal floor 13, which can be fixed by adhesion or mechanical connection. In conjunction with FIGS. 2 and 3, the metalized through holes are uniformly distributed on the cavity-wall metal strip 12, and penetrate the metal ground plate 13. It can be seen that the metalized through holes shown in FIG. 2 correspond to those shown in FIG.3 one by one.
FIG. 4 illustrates the structure of a radiation-enhanced cavity described in an embodiment of the present invention, and FIG. 5 is a rear view of the radiation-enhanced cavity shown in FIG. 4. Based on the high-frequency dielectric substrate 41, the cavity- wall metal strip (42,43) for enclosing and surrounding a certain area is correspondingly laid on the upper and lower sides of the high-frequency dielectric substrate 41 respectively (as shown in FIG. 5). The metalized through holes 44 are uniformly distributed on the cavity-wall metal strips. According to the theory of the cavity mode of electromagnetic wave, the distance between the metalized through holes should be about a quarter of the wavelength of electromagnetic wave transmitted therethrough, and preferably smaller than one eighth of the wavelength of electromagnetic wave transmitted therethrough, so as to constitute a structure of a resonant cavity.
According to another preferred embodiment of the present invention, the cavity- wall metal strip (42, 43) also has another circle of uniformly distributed metalized through holes added on the outer side of the cavity-wall metal strip (not shown in FIG. 4 and 5). The distance between them also should be about a quarter of the wavelength of electromagnetic wave transmitted therethrough, and preferably smaller than one eighth of the wavelength of electromagnetic wave transmitted therethrough. It should be noted that each metalized through hole of the outer side circle should be located correspondingly between every two holes of the inner circle. Such arrangement can further reduce the electromagnetic leakage. According to an embodiment of the present invention, the area of the radiation- enhanced cavity enclosed by the cavity- wall metal strip (42, 43) is rectangular. However, it also can be enclosed into a circular area or a non-fully regular closed area.
According to the shape formed by the above-mentioned cavity-wall metal strips, it will be known to those skilled in the art that the area enclosed by cavity-wall metal strip 12 in the ground plate unit shown in FIG. 2 should also be a rectangular, circular or not fully regular closed area correspondingly.
FIG. 6 is a specific embodiment of the feed network in an embodiment of the present invention, and FIG. 7 is a rear view of the feed network embodiment of the present invention shown in FIG. 6. It can be seen from FIG.6 and FIG.7 that the feed network of the present invention is formed by overlapping the high-frequency dielectric substrate 21, the excitation circuit 22 attached to the upper surface of the high-frequency dielectric substrate 21 and the metal coupling plate 23 attached to the lower surface of the high- frequency dielectric substrate 21.
FIG. 6 shows two sets of excitation circuits, which actually constitute a dipole antenna. The openings of the two excitation circuits are referred to as excitation slots, and its arrangement requires the two excitation slots to be orthogonal to each other, so that there is no interference between the two sets of excitation circuits. Obviously, if only one set excitation circuit is arranged, it will be a typical monopole antenna, which still can solve the technical problems that the present invention addresses.
Referring to FIG. 7, a coupling slot 231 is carved on the metal coupling plate 23 attached to the lower surface of the high-frequency dielectric substrate 21. The coupling slot is formed after the metal coating layer of the area is removed from the metal coupling plate 23. FIG.7 shows a cross coupling slot, which also can be strip-shaped, with the length of a half of the guide wavelength.
The coupling slot 231 just faces the radiation-enhanced cavity located therebelow, functions to couple the electric signal introduced by a microstrip excitation circuit into the dielectric resonant cavity and to radiate the resonant signal within the dielectric resonant cavity into space.
In the embodiment as above-mentioned, the radiation-enhanced cavity is a resonant cavity in a circular or square array formed by making a series of metal through holes on a high-frequency dielectric substrate. If the thickness of one dielectric layer is not enough, the dielectric substrate may be implemented to be a multilayer structure with a circular or square metal guide strip left between the layers for the metalized through holes to pass through. In the above-mentioned embodiment, referring to FIG.l, a support material may be disposed between the excitation circuit 22 of the feed network and the antenna director, such as the low dielectric constant foamed material or other support materials, with metal sheets distributed thereon.
According to the above-mentioned embodiments, the present invention further provides a method for manufacturing the radiation-enhanced cavity antenna with a dielectric substrate, and particularly for manufacturing the radiation-enhanced cavity. Specifically, the method comprising: correspondingly laying a cavity-wall metal strip for enclosing and surrounding a certain area on the upper and lower faces of the high-frequency dielectric substrate respectively; uniformly distributing multiple metalized through holes on each cavity-wall metal strip, wherein the distance between the metalized through holes is about a quarter of the wavelength of electromagnetic wave transmitted therethrough; and placing the radiation-enhanced cavity between a ground plate and a feed network and attaching an antenna director onto the feed network.
In the above method, the detailed step is disposing the low dielectric constant foamed material or other support material, with metal sheets distributed thereon, between the feed network and the antenna director, for the low dielectric constant foamed material can be used for supporting and fixing the metal sheets, of course, the dielectric bolts can also be used for fixation. The high dielectric constant material will affect the bandwidth and radiation of an antenna, which should be avoided if possible, so that the low dielectric constant foamed material is employed. As the foamed dielectric has low specific gravity, it is easy to merge lots of air, thus lowering the average dielectric constant. Distributing the metal sheets onto the low dielectric constant foamed material which acting as the antenna director is also a way to enhance radiation and increase bandwidth.
FIG. 8-11 illustrate the test result of the radiation-enhanced cavity antenna with a dielectric substrate of the present invention accomplished in the 2.4Ghz. It is selected that the diameter of the metalized through holes of the radiation-enhanced cavity is 0.5 mm, the distance between the through holes is 2.5 mm, and the dielectric constant of the dielectric substrate is 2.65.
FIG. 8 illustrates an antenna pattern of the radiation-enhanced cavity antenna with a dielectric substrate according to an embodiment of the present invention. There are two curves in FIG. 8, wherein the thinner dashed line represents E-plane pattern, and the thicker one represents H-plane pattern. It can be seen that the patterns are ideal.
FIG. 9 illustrates the antenna standing-wave feature of the radiation-enhanced cavity dipole antenna with a dielectric substrate according to an embodiment of the present invention, wherein the real line and the dashed line represent respectively the standing wave features of two dual-polarized antennae. As seen from FIG. 9, the corresponding bandwidth below 10 decibel is about 700 MHz.
FIG. 10 is a test graph of the standing wave of the radiation-enhanced cavity antenna with a dielectric substrate according to an embodiment of the present invention, wherein four dots (1, 2, 3, 4) are marked, and the bandwidth from dot 1 to dot 3 has been already wider than 0.5 G, i.e. 500 M. The corresponding bandwidth below 10 decibel is 700 MHz, and the relative bandwidth is 29%. This indicates that the effect of the antenna of the present invention can be regarded as an ultrawideband antenna (the bandwidth of an ultrawideband antenna defined as 20%).
FIG. 11 is a test graph of the dual-polarization isolation employing the radiation- enhanced cavity dipole antenna with a dielectric substrate of an embodiment of the present invention. It can be seen that the curve is below - 20 decibel, indicating that the isolation between the two ports is fine and the interference between each other is quite small.
Although the technical content and features of the present invention have been disclosed according to the above descriptions, it will apparent to those skilled in the art that various alternations and modifications may be made based on the teachings and disclosure of the present invention, without departing from the spirit of the present invention. Therefore, the scope of the present invention should not be limited to the disclosure of the embodiments, but include various alternations and modifications, without deviating from the present invention and being contemplated by the following claims.

Claims

CLAIMS:
1. A radiation-enhanced cavity antenna with a dielectric substrate comprising: a ground plate, a radiation-enhanced cavity, a feed network and an antenna director attached onto the feed network, wherein the radiation-enhanced cavity having a dielectric substrate is located between the ground plate and the feed network; the dielectric substrate has multiple metalized through holes enclosing and surrounding a certain area; and the distance between the metalized through holes enables the metalized through holes to at least partially reflect the electromagnetic wave transmitted in the dielectric substrate.
2. The radiation-enhanced cavity antenna with a dielectric substrate according to Claim 1, wherein the distance between the metalized through holes is substantially a quarter of the wavelength of the electromagnetic wave transmitted in the dielectric substrate.
3. The radiation-enhanced cavity antenna with a dielectric substrate according to Claim 1, wherein the distance between the metalized through holes is substantially smaller than a quarter of the wavelength of the electromagnetic wave transmitted in the dielectric substrate.
4. The radiation-enhanced cavity antenna with a dielectric substrate according to Claim 1,
2 or 3, wherein the periphery of the metalized through holes is surrounded by another circle of metalized through holes.
5. The radiation-enhanced cavity antenna with a dielectric substrate according to Claim 1, 2 or 3, wherein the ground plate includes a substrate, under which a metal ground plate is overlapped, and the substrate has multiple metalized through holes enclosing and surrounding a certain area through the substrate and the metal ground plate.
6. The radiation-enhanced cavity antenna with a dielectric substrate according to Claim 5, wherein the positions of the multiple metalized through holes within the substrate correspond to the positions of the multiple metalized through holes within the radiation- enhanced cavity.
7. The radiation-enhanced cavity antenna with a dielectric substrate according to Claim 1, 2 or 3, wherein the dielectric substrate in the radiation-enhanced cavity is accomplished by a multilayer structure with the metalized through holes of each layer corresponding to and electrically connecting to each other.
8. A method for manufacturing a radiation-enhanced cavity antenna with a dielectric substrate, comprising: disposing multiple metalized through holes enclosing and surrounding a certain area in a dielectric substrate, wherein the distance between the metalized through holes enables the metalized through holes to at least partially reflect the electromagnetic wave transmitted in the dielectric substrate; disposing a radiation-enhanced cavity having the dielectric substrate between a ground plate and a feed network; and attaching an antenna director onto the feed network.
9. The method for manufacturing the radiation-enhanced cavity antenna with a dielectric substrate according to Claim 8, wherein the distance between the metalized through holes is substantially smaller than or equal to a quarter of the wavelength of the electromagnetic wave transmitted in the dielectric substrate.
10. The method for manufacturing the radiation-enhanced cavity antenna with a dielectric substrate according to Claim 8, further comprising disposing another circle of the metalized through holes around the periphery of the metalized through holes.
PCT/IB2006/050296 2005-01-31 2006-01-27 Radiation enhanced cavity antenna with dielectric WO2006079994A1 (en)

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CN 200510005026 CN1815806B (en) 2005-01-31 2005-01-31 Medium substrate radiation reinforcing-chamber type antenna

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104681981A (en) * 2015-02-27 2015-06-03 南通大学 Integrated short backfire antenna of millimeter wave dielectrics
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KR102138841B1 (en) 2014-05-13 2020-08-11 삼성전자 주식회사 Antenna device
CN104617398B (en) * 2015-01-30 2018-10-09 中天宽带技术有限公司 With low axis than circular polarisation cavity-backed radiator antenna
US10862211B2 (en) 2018-08-21 2020-12-08 Htc Corporation Integrated antenna structure
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CN104681981A (en) * 2015-02-27 2015-06-03 南通大学 Integrated short backfire antenna of millimeter wave dielectrics
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CN114927868A (en) * 2022-06-16 2022-08-19 南通大学 Bidirectional radiation filtering antenna
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