WO2011013969A2 - Antenne à couches multiples utilisant un métamatériau et appareil de communication mobile comprenant cette dernière - Google Patents

Antenne à couches multiples utilisant un métamatériau et appareil de communication mobile comprenant cette dernière Download PDF

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Publication number
WO2011013969A2
WO2011013969A2 PCT/KR2010/004892 KR2010004892W WO2011013969A2 WO 2011013969 A2 WO2011013969 A2 WO 2011013969A2 KR 2010004892 W KR2010004892 W KR 2010004892W WO 2011013969 A2 WO2011013969 A2 WO 2011013969A2
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Prior art keywords
conductor
antenna
metamaterial
height
ground
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PCT/KR2010/004892
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English (en)
Korean (ko)
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WO2011013969A3 (fr
Inventor
유병훈
성원모
박영환
Original Assignee
주식회사 이엠따블유
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Publication of WO2011013969A2 publication Critical patent/WO2011013969A2/fr
Publication of WO2011013969A3 publication Critical patent/WO2011013969A3/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/0414—Substantially flat resonant element parallel to ground plane, e.g. patch antenna in a stacked or folded configuration
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/10—Resonant antennas
    • H01Q5/15—Resonant antennas for operation of centre-fed antennas comprising one or more collinear, substantially straight or elongated active elements

Definitions

  • the present invention relates to a multi-layered antenna using a metamaterial and a mobile communication device including the same. More particularly, fine tuning of a resonant frequency is possible through various structural variables, and is provided by a ground plane located around the antenna.
  • the present invention relates to a multilayer antenna using a metamaterial that can also prevent performance degradation and a mobile communication device including the same.
  • the small antenna used in a portable device or the like has a very small physical length compared to the electrical length of the antenna.
  • the LH characteristic refers to the characteristic of the electric field, the magnetic field, and the propagation direction of the electromagnetic wave following the left hand law as opposed to the right hand law. It is related to the theory of artificial metamaterial.
  • Metamaterial refers to a material or electromagnetic structure that is artificially designed to have special electromagnetic properties not normally found in nature. In general, and in this specification, metamaterial refers to permittivity. ) Or a material whose magnetic permeability is both negative or such an electromagnetic structure.
  • Such a material is also called a Double NeGative (DNG) material in the sense of having two negative parameters.
  • DNG Double NeGative
  • metamaterials have a negative reflection coefficient due to their negative dielectric constant and permeability, and thus are also called NRI (Negative Refractive Index) materials.
  • metamaterials are sometimes referred to as left-handed materials (LHMs).
  • LHMs left-handed materials
  • the relationship between ⁇ (phase constant) and ⁇ (frequency) is not linear in the metamaterial, and the characteristic curve is also present in the left half of the coordinate plane. Due to such nonlinear characteristics, the metamaterial has a small phase difference according to frequency, so that a wideband circuit can be realized. Since the phase change is not proportional to the length of the transmission line, a small circuit can be realized.
  • the practical application of the LH propagation phenomenon in the microwave field is mainly based on the transmission line LHM structure.
  • a typical transmission line equivalent circuit model which is generally represented by an equivalent circuit of a capacitor connected in parallel with an inductor connected in series to a power supply, the inductor and the capacitor are changed to include an inductor connected in parallel with a capacitor in series with the power supply.
  • the phase velocity of the electromagnetic wave transmitted through this is reversed. Since the LHM of the transmission line method is a non-resonant (or zero-order resonant) structure, it is much more advantageous in terms of bandwidth and loss than the method based on the general resonance structure.
  • the structural aspect can be implemented in the form of transmission lines widely used in the microwave field, there is a more convenient advantage for practical applications in microwave circuits. Accordingly, especially in the microwave application research using the characteristics of the LHM, a transmission line type LHM structure or a composite right-left-handed (CRLH) structure having both right-handed (RH) and LH characteristics is used.
  • a transmission line type LHM structure or a composite right-left-handed (CRLH) structure having both right-handed (RH) and LH characteristics is used.
  • FIG. 1 is a cross-sectional view for explaining the structure of an antenna using a metamaterial according to the prior art.
  • the antenna 10 has the 1st conductor 11 arrange
  • the second conductor 12 having a predetermined distance r from the first conductor 11 by being disposed to have a predetermined area horizontally with the floor 1 at the same height as the height of the).
  • the first conductor 11 is connected to the first pad 13 via a connection structure such as a via hole
  • the second conductor 12 is also connected to the second pad 14 via a connection structure such as a via hole.
  • the bottom 1, the top 3, and the side 5 of the solid line are represented by the first conductor 11, the second conductor 12, the first pad 13, and the second pad 14. It shows that it can be designed and manufactured to be mounted on one chip (chip) (7).
  • the chip 7 may be formed of a dielectric material.
  • the antenna 10 connects one of the first conductor 11 and the second conductor 12 to a power supply element (not shown), and connects the other to ground (not shown).
  • 11 and the second conductor 12 may form an electromagnetic coupling.
  • a printed circuit board PCB
  • the first conductor 11 and the second conductor 12 form an electromagnetic coupling, that is, a capacitor, so that an antenna having a CRLH structure is implemented.
  • the inductance component induced by the first conductor 11 and the second conductor 12 is adjusted or the inductance component by the inductor of the PCB is adjusted.
  • the tuning of the resonant frequency by adjusting the inductance component has a disadvantage in that fine tuning of the resonant frequency is difficult because the impedance and the resonant frequency change rapidly with the change of the inductance value.
  • the present invention is to solve the problems of the prior art as described above, by providing an antenna having a structure that can easily adjust the capacitance component of the capacitor affecting the resonance frequency and impedance of the antenna, in particular, the material antenna
  • the purpose of this is to facilitate fine tuning.
  • Another object of the present invention is to resonate by adjusting a capacitor influencing the resonant frequency and impedance through a variety of variables in the multilayer antenna, that is, the relationship between a plurality of conductors included in the antenna, the dielectric constant of the dielectric material included in the antenna This allows for easy tuning of frequencies.
  • another object of the present invention is to ensure that even if the antenna is located in the intermediate position of the printed circuit board typically included in the mobile communication terminal performance degradation due to the surrounding ground plane.
  • a first conductor formed horizontally with the floor at a first height from the bottom arranged to have a first area, at a second height from the bottom
  • a multilayer antenna using a metamaterial including a third conductor disposed to have a.
  • One of the first and second conductors may be connected to ground, the other of which may be connected to a power supply element, and the conductor connected to the power supply element may transfer power from the power supply element to the third conductor.
  • Feeding from the conductor connected to the feed element to the third conductor may be a coupling feed.
  • the conductor connected to the ground and the third conductor may be electromagnetically coupled.
  • Each of the first and second conductors may be connected to an inductor, and each of the inductors may be connected to the third conductor in parallel.
  • Connection between the first and second conductors, the ground, and the feed element may be made through conductive vias, and each inductor may be a parasitic component of the conductive vias.
  • the first conductor and the second conductor may be formed at the same height and may be spaced apart from each other by a predetermined distance in the horizontal direction.
  • the third conductor may be formed in parallel with at least a portion of the first conductor and the second conductor, and may have a cross area.
  • the multilayer antenna using the metamaterial further includes a fourth conductor formed horizontally with the floor at a fourth height different from the first height and the second height from the bottom, and arranged to have a fourth area. can do.
  • any one of the first conductor, the second conductor and the fourth conductor is connected to a feeding element, at least one of the conductors not connected to the feeding element is connected to ground, and the conductor connected to the feeding element is the feeding element.
  • the feed from can be delivered to the third conductor.
  • Feeding from the conductor connected to the feed element to the third conductor may be a coupling feed.
  • the conductor connected to the ground and the third conductor may be electromagnetically coupled.
  • the conductors connected to the power feeding element and the conductors connected to the ground may be respectively connected to an inductor, and each of the inductors may be connected to the third conductor in parallel.
  • Connection to the power supply element and connection to the ground may be made through conductive vias, and each inductor may be a parasitic component of the conductive vias.
  • the first conductor, the second conductor, and the fourth conductor may be formed at the same height and may be formed to be spaced apart by a predetermined distance in the horizontal direction.
  • the third conductor may be formed in parallel with at least a portion of the first conductor, the second conductor, and the fourth conductor, and may have a cross area.
  • a mobile communication device including a multi-layer antenna using the above-described metamaterial.
  • a first conductor formed horizontally with the floor at a first height from the bottom arranged to have a first area, at a second height from the bottom
  • a multilayer antenna using a metamaterial including a third conductor disposed to have a.
  • One of the first and second conductors may be connected to ground, the other of which may be connected to a power supply element, and the conductor connected to the power supply element may transfer power from the power supply element to the third conductor.
  • Feeding from the conductor connected to the feed element to the third conductor may be a coupling feed.
  • the conductor connected to the ground and the third conductor may be electromagnetically coupled.
  • Each of the first and second conductors may be connected to an inductor, and each of the inductors may be connected to the third conductor in parallel.
  • Connection between the first and second conductors, the ground, and the feed element may be made through conductive vias, and each inductor may be a parasitic component of the conductive vias.
  • the first conductor and the second conductor may be formed at the same height and may be spaced apart from each other by a predetermined distance in the horizontal direction.
  • the third conductor may be formed in parallel with at least a portion of the first conductor and the second conductor, and may have a cross area.
  • the multilayer antenna using the metamaterial further includes a fourth conductor formed horizontally with the floor at a fourth height different from the first height and the second height from the bottom, and arranged to have a fourth area. can do.
  • any one of the first conductor, the second conductor and the fourth conductor is connected to a feeding element, at least one of the conductors not connected to the feeding element is connected to ground, and the conductor connected to the feeding element is the feeding element.
  • the feed from can be delivered to the third conductor.
  • Feeding from the conductor connected to the feed element to the third conductor may be a coupling feed.
  • the conductor connected to the ground and the third conductor may be electromagnetically coupled.
  • the conductors connected to the power feeding element and the conductors connected to the ground may be respectively connected to an inductor, and each of the inductors may be connected to the third conductor in parallel.
  • Connection to the power supply element and connection to the ground may be made through conductive vias, and each inductor may be a parasitic component of the conductive vias.
  • the first conductor, the second conductor, and the fourth conductor may be formed at the same height and may be formed to be spaced apart by a predetermined distance in the horizontal direction.
  • the third conductor may be formed in parallel with at least a portion of the first conductor, the second conductor, and the fourth conductor, and may have a cross area.
  • a mobile communication device including a multi-layer antenna using the above-described metamaterial.
  • FIG. 1 is a cross-sectional view for explaining the structure of an antenna using a metamaterial according to the prior art.
  • 2 to 7 are a perspective view and a front view for showing the configuration of a multi-layer antenna using a metamaterial according to an embodiment of the present invention.
  • FIGS. 8 to 11 are equivalent circuit diagrams of a multilayer antenna using the metamaterial shown in FIGS. 2 to 7.
  • FIG. 14 is a graph illustrating reflection characteristics of a multilayer antenna using metamaterials according to an embodiment of the present invention.
  • 15 is a graph illustrating 3D gain characteristics of a multilayer antenna using metamaterials according to an embodiment of the present invention.
  • FIGS. 2 and 5 are perspective views of a multilayer antenna according to the present invention
  • FIGS. 3 and 6 illustrate a third conductor (to be described later) to describe in detail the configuration of the multilayer antenna of FIGS. 2 and 5. It is a figure which shows the state removed. 4 and 7 show front views of the multilayer antenna of FIGS. 2 and 5, respectively.
  • the multilayer antenna 100 is formed horizontally with the floor 101 at a first height from the floor 101 and is formed to have a first area.
  • the first conductor 110, the second conductor 120 is formed at a second height from the bottom 101 to the bottom 101, the second conductor 120 is formed to have a second area, the first height and the second from the bottom 101
  • a third conductor 130 formed horizontally with the bottom 101 at a third height different from the height, and having a third area, and intersecting the first conductor 111 and the second conductor 112 horizontally with each other;
  • the fourth conductor 140 may be formed horizontally with the bottom 101 at a fourth height different from the first height and the second height from the bottom 101, and may have a fourth area. .
  • the first conductor 110 may be connected to the lower first pad 112 through a connection structure such as a conductive via 111, and the second conductor 120 may also be connected to a connection structure such as a conductive via 121. It may be connected to the lower second pad 122 through.
  • the first pad 112 and the second pad 122 may be formed in the same plane, where the same plane may be the same plane as the bottom 101. Meanwhile, heights from the bottom on which the first conductor 110 and the second conductor 120 are formed, that is, the first height and the second height may be the same height as illustrated in FIGS. 2 to 7.
  • the third conductor 130 is a component that substantially serves as a radiator in the multilayer antenna 100. As illustrated in FIGS. 2 to 7, the third conductor 130 may be formed to completely cover the first conductor 110 and the second conductor 120 at a predetermined distance, but is not limited thereto. . That is, the third conductor 130 is sufficient to cross horizontally with at least a portion of the first conductor 110 and the second conductor 120.
  • a fourth conductor formed at a lower portion of the third conductor 130 at a fourth height from the bottom 101 and horizontally with the bottom 101 is formed to have a fourth area. 140 may be further formed.
  • the fourth conductor 140 may be connected to the lower third pad 142 through a connection structure such as a conductive via 141.
  • the fourth conductor 140 may be implemented in any form, and in some cases, the top surface of the conductive via 141 may function as the fourth conductor 140 without being implemented as a separate component.
  • any one of the first conductor 110, the second conductor 120, and the fourth conductor 140 is connected to a feed element (not shown), and at least one of the conductors not connected to the feed element is grounded. Can be connected to.
  • the conductor connected to the power feeding element among the first conductor 110, the second conductor 120, and the fourth conductor 140 is electromagnetically coupled (coupling-coupled) with the third conductor 130 to form a third conductor.
  • a coupling feed can be formed in relationship with 130.
  • the conductive vias 111, 121, and 141 coupled to the conductors connected to the power feeding element may extend to the upper portion of the conductors to be directly electrically connected to the third conductors 130.
  • the conductive via 141 extending upward from the third pad 142 may be the fourth. It may extend through the conductor 140 to the third conductor 130. In this case, the fourth conductor 140 may be omitted.
  • the power supply to the third conductor 130 by the power supply element can be implemented by a direct power supply method, not a coupling power supply, and the first conductor 110 and the second conductor 120 connected to the ground. The amount of electromagnetic coupling in the overall circuit can be adjusted according to the relationship between at least one of the and the third conductor 130. This will be described later in detail. Meanwhile, as illustrated in FIGS.
  • the fourth conductor 140 and the third conductor 130 which are connected to the power feeding element, are electromagnetically coupled and connected to ground, respectively, the first conductor 110 and the second conductor.
  • At least one of the conductors 120 may be directly electrically connected to the third conductor 130. That is, as shown in FIG. 6, the conductive via 111 extending from the first pad 112 may extend through the first conductor 110 to the third conductor 130.
  • the fourth conductor 140 and the third conductor 130 which are connected to the power feeding element are electromagnetically coupled, and the first conductor 110 and the second conductor 120 are connected to the third conductor 130.
  • the amount of electromagnetic coupling may be adjusted according to the relationship (interval, etc.) between the first conductor 110 and the second conductor 120.
  • the electromagnetic coupling amount may be adjusted according to the relationship between the fourth conductor 140 and the third conductor 130.
  • first conductor 110, the second conductor 120, and the fourth conductor 140 may be connected with a device that functions as a parallel inductor component in a composite right / left handed transmission line (CRLH-TL) structure.
  • a device functioning as the inductor component may be formed separately, but the first conductor 110, the second conductor 120, and the fourth conductor 140 may be formed of the first pad 112, the second pad 122, and the second conductor 122, respectively.
  • Parasitic components of the conductive vias 111, 121, and 141 connecting to the third pad 142 may function as the inductor component.
  • At least one of the first conductor 110, the second conductor 120, and the fourth conductor 140 and the third conductor 130 form an electromagnetic coupling to form a series capacitor component in the CRLH-TL structure. Can function.
  • at least one of the first conductor 110, the second conductor 120 and the fourth conductor 140 and the separation distance R between the third conductor 130 or the third conductor 130 By adjusting the cross-sectional area, the amount of electromagnetic coupling can be adjusted.
  • the distance between the first conductor 110, the second conductor 120, and the fourth conductor 140 is By adjusting, the amount of electromagnetic coupling can also be adjusted.
  • the amount of electromagnetic coupling it is possible to adjust the capacitance component of the CRLH-TL structure, and to fine tune the resonance frequency of the antenna 100 as a whole. For example, if the area of the first conductor 110 and the area of the second conductor 120 are increased, the cross sectional area is increased in relation to the third conductor 130, thereby increasing the amount of electromagnetic coupling. As a result, the capacitance component is increased. As another example, the amount of electromagnetic coupling may be adjusted by reducing the distance between the first conductor 110 and the second conductor 120.
  • the capacitance component in the CRLH-TL structure can be easily adjusted as desired, and finer tuning can be possible than in the prior art.
  • FIGS. 2 to 7 may be designed and manufactured to be mounted on one chip (not shown).
  • a chip may include a carrier formed of a dielectric material, and the amount of electromagnetic coupling according to the relationship between the conductors 110, 120, 130, and 140 may also be adjusted by adjusting the dielectric constant of the carrier.
  • Such a structure may be formed through a Low Temperature Cofired Ceramics (LTCC) method.
  • LTCC Low Temperature Cofired Ceramics
  • a multilayer antenna includes a first inductor L1 and a second inductor L2 functioning as parallel inductors, a first capacitor C0 functioning as a series capacitor, and a first transmission.
  • the circuit diagram of the CRLH-TL structure including the line T1 and the second transmission line T2 may be equivalent.
  • 9 is an equivalent circuit diagram of the circuit shown in FIG. 8. Referring to FIG. 9, the first transmission line T1 and the second transmission line T2 each have a series inductor L T1 , L T2 component and a parallel capacitor C T1 , C T2 component in the entire CRLH-TL structure. It can be expressed as having.
  • the first inductor L1 and the second inductor L1 may be components corresponding to the inductor connected to the first conductor 110, the second conductor 120, and the fourth conductor 140.
  • the parasitic components of the conductive vias 111, 121, and 141 may be equivalent to the first inductor L1 and the second inductor L2.
  • the first capacitor C0 is a capacitance component according to the amount of electromagnetic coupling determined by the relationship between the conductors 110, 120, 130, and 140.
  • the conductive vias 111 and 141 are formed of the first inductor L1 and the second inductor. Equivalent to (L2), the relationship between the fourth conductor 140 and the third conductor 130 (distance and intersection area), the relationship between the first conductor 110 and the third conductor 130 (distance ( The capacitance component determined by R) and the crossover area) may be equivalent to the first capacitor C0. In order for the capacitance component according to the relationship between the fourth conductor 140 and the third conductor 130 to exist, the fourth conductor 140 and the third conductor 130 must be electromagnetically coupled.
  • the conductive vias 121 and 111 are formed of the first inductor L1 and the second. It may be equivalent to the inductor (L2), and the relationship between the first conductor 110 and the second conductor 120 and the third conductor 130 (distance R and the intersection area), and the first conductor 110
  • the capacitance component according to the relationship between the second conductors 120 may be equivalent to the first capacitor C0.
  • any one of the first conductor 110, the second conductor 120, and the fourth conductor 140 may be connected to the power supply element, and two conductors not connected to the power supply element may be connected to the ground.
  • An equivalent circuit diagram of is shown in FIG. That is, the inductor components according to the two conductors connected to the ground may function as the parallel inductors L2 and L3.
  • the fourth conductor 140 is connected to the feed element and the first conductor 110 and the second conductor 120 are connected to the ground, the conductive via connected to the fourth conductor 140.
  • the conductive vias 111 and 121 connected to the first conductor 110 and the second conductor 120 are respectively the second inductor L2 and the third inductor ( L3).
  • the circuit shown in FIG. 10 is also equivalent to the second inductor L2 and the third inductor L3 by the fourth inductor L4 and can be represented as shown in FIG. The same can be said.
  • the multi-layer antenna according to the present invention can form a CRLH-TL structure circuit including both the LH structure of the series capacitor and the parallel inductor and the RH structure of the parallel capacitor and the series inductor, thereby forming a metamaterial circuit.
  • the metamaterial antennas shown in FIGS. 8 to 11 are merely exemplary, and of course, the number of radiators, the number of inductors, the number of capacitors, and the like may be freely changed as required by those skilled in the art.
  • FIG. 12 shows an actual implementation of a multilayer antenna using metamaterials according to the present invention
  • FIG. 13 is a diagram schematically showing the configuration shown in FIG.
  • the multilayer antenna of the present invention may include a pad layer formed under the first substrate 510, the second substrate 520, and the first substrate 510. P), at least one conductor layer C formed between the first substrate 510 and the second substrate 520, and a radiator layer R formed on the second substrate 520.
  • the pad layer P corresponds to the pads 112, 122, and 142 described with reference to FIGS. 2 to 7, and the conductor layer C includes the first conductor 110, the second conductor 120, and the fourth conductor ( Corresponds to 140, and the radiator layer R corresponds to the third conductor 130.
  • a series capacitance component is realized according to the relationship between the conductor layer C and the radiator layer R and the relationship between the plurality of conductors formed in the conductor layer C, and the conductor layer C
  • the parallel inductance component is realized by an inductor component that is separately connected to or formed by a conductive connection relationship between the conductor layer C and the pad layer P.
  • the multilayer antenna according to the present invention is formed at an intermediate position of the printed circuit board 500 which is typically included in the mobile terminal, performance does not decrease.
  • the multi-layer antenna of the present invention has a plurality of pads that can be connected to the ground, the antenna can be realized by connecting the plurality of pads to the ground plane even if the ground planes are located at both sides of the antenna. It is possible to prevent a decrease in radiation efficiency due to the ground plane located on both sides of the antenna.
  • the antenna is located in the middle portion of the printed circuit board 500 included in the conventional mobile terminal, that is, even if the ground plate is located on both sides of the antenna, the performance of the antenna is not degraded.
  • FIGS. 14 and 15 are graphs illustrating performance of a multilayer antenna according to the present invention, that is, an antenna implemented as shown in FIGS. 12 and 13.

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Abstract

La présente invention concerne une antenne à couches multiples utilisant un métamatériau et un appareil de communication mobile comprenant cette dernière. L'antenne à couches multiples utilisant un métamatériau selon un mode de réalisation de la présente invention comprend : un premier conducteur qui est formé à l'horizontale par rapport au sol à une première hauteur du sol et possède une première superficie ; un deuxième conducteur qui est formé à l'horizontale par rapport au sol à une deuxième hauteur du sol et possède une deuxième superficie ; et un troisième conducteur qui est formé à l'horizontale par rapport au sol à une troisième hauteur du sol et possède une troisième superficie, la troisième hauteur étant différente des première et deuxième hauteurs.
PCT/KR2010/004892 2009-07-27 2010-07-26 Antenne à couches multiples utilisant un métamatériau et appareil de communication mobile comprenant cette dernière WO2011013969A2 (fr)

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KR1020090068302A KR20110010938A (ko) 2009-07-27 2009-07-27 메타머티리얼을 이용한 다층 구조 안테나 및 이를 포함하는 이동 통신 장치
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102176544A (zh) * 2011-02-28 2011-09-07 复旦大学 一种超薄微波波片
CN102176544B (zh) * 2011-02-28 2013-10-16 复旦大学 一种超薄微波波片

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