TWI420812B - Filter - Google Patents
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- TWI420812B TWI420812B TW97108074A TW97108074A TWI420812B TW I420812 B TWI420812 B TW I420812B TW 97108074 A TW97108074 A TW 97108074A TW 97108074 A TW97108074 A TW 97108074A TW I420812 B TWI420812 B TW I420812B
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Description
本發明涉及一種濾波器，尤其涉及一基於奈米碳管的濾波器。 The present invention relates to a filter, and more particularly to a carbon nanotube based filter.
濾波器係無線電技術中的主要器件之一，它被廣泛應用於通訊、雷達、導航、電子對抗、衛星、測試儀錶等電子設備中(請參見，Design and analysis of planar printed microwave and PBG filter using an FDTD method,Microelectronics Journal,V35,P777-781(2004))。 Filter is one of the main components in radio technology, it is widely used in communications, radar, navigation, electronic countermeasures, satellite, test instrumentation and other electronic equipment (see, Design and analysis of planar printed microwave and PBG filter using an FDTD method, Microelectronics Journal, V35, P777-781 (2004)).
請參閱圖1，先前技術提供一種腔體濾波器10，其包括：一屏蔽盒102，一隔離牆114設置於該屏蔽盒102內，且該隔離牆114將屏蔽盒102內部空間分割為兩個諧振腔104，兩個諧振子106分別設置於兩個諧振腔104內，以及一輸入裝置108和一輸出裝置110。該諧振子106一端固定於屏蔽盒102底部的內壁上，另一端延伸至諧振腔104內。該輸入裝置108一端通過一諧振腔104的側壁與諧振腔104外的輸入連接器(圖中未顯示)相連，且另一端延伸至該諧振腔104內。該輸出裝置110一端通過另一諧振腔104的側壁與諧振腔104外的輸出連接器(圖中未顯示)相連，該另一端延伸至該諧振腔104內。在兩個諧振腔104的隔離牆114上開有一槽孔116，該槽孔116用來實現相鄰兩個諧振腔104之間的電容耦合。在該槽孔116內還可以進一步設置一電容耦合元件(圖中未顯 示)。進一步，每個諧振腔104內還可以設置至少一個調頻器112，用來調節腔體濾波器10的諧振頻率。該腔體濾波器10中的屏蔽盒102又稱外導體，諧振子106又稱內導體，故，該腔體濾波器10可以構成兩個電抗元件。所述兩個電抗元件與外電路連接可以形成一個等效諧振電路。當該腔體濾波器10工作時，微波訊號由裝置108輸入，經過等效諧振電路時，電抗元件會對電流的大小與方向的改變起到阻礙。故，通過控制腔體濾波器10構成的電抗元件的性能，就可以選擇不同頻率的微波訊號。 Referring to FIG. 1 , the prior art provides a cavity filter 10 including: a shielding box 102 , a partition wall 114 is disposed in the shielding box 102 , and the partition wall 114 divides the internal space of the shielding box 102 into two The resonant cavity 104, the two resonators 106 are disposed in the two resonant cavities 104, respectively, and an input device 108 and an output device 110. The resonator 106 is fixed at one end to the inner wall of the bottom of the shield case 102 and at the other end to the cavity 104. One end of the input device 108 is connected to an input connector (not shown) outside the resonant cavity 104 through a sidewall of a resonant cavity 104, and the other end extends into the resonant cavity 104. One end of the output device 110 is connected to an output connector (not shown) outside the resonant cavity 104 through a sidewall of the other resonant cavity 104, and the other end extends into the resonant cavity 104. A slot 116 is formed in the partition wall 114 of the two resonant cavities 104 for achieving capacitive coupling between adjacent resonant cavities 104. A capacitive coupling element can be further disposed in the slot 116 (not shown in the figure) Show). Further, at least one frequency modulator 112 may be disposed in each of the resonant cavities 104 for adjusting the resonant frequency of the cavity filter 10. The shield box 102 in the cavity filter 10 is also referred to as an outer conductor, and the resonator 106 is also referred to as an inner conductor. Therefore, the cavity filter 10 can constitute two reactive elements. The two reactive components are connected to an external circuit to form an equivalent resonant circuit. When the cavity filter 10 is in operation, the microwave signal is input by the device 108. When the equivalent resonant circuit is passed, the reactance element hinders the change in the magnitude and direction of the current. Therefore, by controlling the performance of the reactance element formed by the cavity filter 10, microwave signals of different frequencies can be selected.
先前的腔體濾波器10中，諧振子106通常為一中空圓柱形結構，該中空圓柱諧振子106的底部通過螺釘固定於屏蔽盒102底部的內壁上。該諧振子106通常採用陶瓷或金屬製作。然而，採用陶瓷製作的諧振子106，由於電阻率較大，故，歐姆損耗較大。採用金屬製作諧振子106，重量較沉，使用不便。 In the previous cavity filter 10, the resonator 106 is generally a hollow cylindrical structure, and the bottom of the hollow cylindrical resonator 106 is fixed to the inner wall of the bottom of the shield case 102 by screws. The resonator 106 is typically fabricated from ceramic or metal. However, the resonator 106 made of ceramic has a large resistivity and therefore has a large ohmic loss. The resonator 106 is made of metal, which is heavy and inconvenient to use.
有鑒於此，提供一種歐姆損耗低，且重量輕，使用方便的腔體濾波器實為必要。 In view of this, it is necessary to provide a cavity filter which is low in ohmic loss and light in weight and easy to use.
一種腔體濾波器，其包括：一屏蔽盒；至少一隔離牆設置於該屏蔽盒內，且該隔離牆上開有一位於隔離牆頂部的槽孔；至少兩個諧振腔按照預定的順序設置於該屏蔽盒內，相鄰的諧振腔之間通過一隔離牆隔離，每個諧振腔內設置一個諧振子，該諧振子一端固定於屏蔽盒內壁上，另一端延伸至諧振腔內；以及一輸入裝置和一輸出裝置，該輸入裝置和輸出裝置分別設置於第一級諧振腔與最後一級諧振腔內，且該輸入裝置和輸出裝置的一端與屏蔽盒內壁電連接，另一端延伸至諧振腔內；其中，所述諧振子包括一 支撐體以及一奈米碳管結構設置於該支撐體表面。 A cavity filter includes: a shielding box; at least one partition wall is disposed in the shielding box, and the partition wall has a slot at the top of the partition wall; at least two resonant cavities are disposed in a predetermined order In the shielding box, adjacent resonant cavities are separated by a partition wall, and each resonant cavity is provided with a resonator, one end of which is fixed on the inner wall of the shielding box, and the other end extends into the resonant cavity; An input device and an output device, wherein the input device and the output device are respectively disposed in the first-stage resonant cavity and the last-stage resonant cavity, and one end of the input device and the output device are electrically connected to the inner wall of the shielding box, and the other end extends to the resonance Inside the cavity; wherein the harmonic oscillator comprises a The support body and a carbon nanotube structure are disposed on the surface of the support.
相較於先前技術，該腔體濾波器中的諧振子包括一支撐體以及一奈米碳管結構設置於該支撐體表面。該諧振子具有以下優點：第一，由於奈米碳管電阻率低，故，該腔體濾波器的歐姆損耗低。第二，該奈米碳管結構具有良好的導電性能且本身的比表面積大，故，腔體濾波器功率容量大。第三，由於奈米碳管密度小，故，該腔體濾波器重量輕，使用方便。 Compared to the prior art, the resonator in the cavity filter includes a support body and a carbon nanotube structure disposed on the surface of the support body. The resonator has the following advantages: First, the ohmic loss of the cavity filter is low due to the low resistivity of the carbon nanotube. Second, the carbon nanotube structure has good electrical conductivity and has a large specific surface area, so the cavity filter has a large power capacity. Third, since the density of the carbon nanotubes is small, the cavity filter is light in weight and convenient to use.
10,20‧‧‧濾波器 10,20‧‧‧ filter
102,202‧‧‧屏蔽盒 102,202‧‧‧ Shielding box
104,204‧‧‧諧振腔 104,204‧‧‧Resonator
106,206‧‧‧諧振子 106,206‧‧‧harmonic oscillator
108,208‧‧‧輸入裝置 108,208‧‧‧ Input device
110,210‧‧‧輸出裝置 110,210‧‧‧output device
112,212‧‧‧調頻器 112,212‧‧‧frequency modulator
114,214‧‧‧隔離牆 114,214‧‧‧The wall
116,216‧‧‧槽孔 116,216‧‧‧ slots
218‧‧‧支撐體 218‧‧‧Support
220‧‧‧奈米碳管結構 220‧‧‧Nano carbon nanotube structure
圖1為先前技術中的腔體濾波器的示意圖。 1 is a schematic diagram of a cavity filter in the prior art.
圖2為本技術方案實施例的腔體濾波器的示意圖。 FIG. 2 is a schematic diagram of a cavity filter according to an embodiment of the present technical solution.
下面將結合附圖對本技術方案作進一步的詳細說明。 The technical solution will be further described in detail below with reference to the accompanying drawings.
請參閱圖2，本技術方案實施例提供一種腔體濾波器20，其包括：一屏蔽盒202，一隔離牆214設置於該屏蔽盒202內，且該隔離牆214將屏蔽盒202內部空間分割為兩個諧振腔204，兩個諧振子206分別設置於兩個諧振腔204內，以及一輸入裝置208和一輸出裝置210。該諧振子206一端固定於屏蔽盒202底部的內壁上，另一端延伸至諧振腔204內。該諧振子206包括一支撐體218以及一奈米碳管結構220設置於該支撐體218表面。該輸入裝置208一端通過一諧振腔204的側壁與諧振腔204外的輸入連接器(圖中未顯示)相連，且另一端延伸至該諧振腔204內。該輸出裝置210一端通過另一諧振腔204的側壁與諧振腔204外的輸出連接器(圖中未顯示)相連，該另一端延伸至該諧振腔204內。 Referring to FIG. 2, the embodiment of the present invention provides a cavity filter 20, which includes: a shielding box 202, a partition wall 214 is disposed in the shielding box 202, and the partition wall 214 divides the internal space of the shielding box 202. Two resonant cavities 204 are disposed in the two resonant cavities 204, respectively, and an input device 208 and an output device 210. The resonator 206 is fixed at one end to the inner wall of the bottom of the shield case 202 and at the other end to the cavity 204. The resonator 206 includes a support 218 and a carbon nanotube structure 220 disposed on the surface of the support 218. One end of the input device 208 is connected to an input connector (not shown) outside the resonant cavity 204 through a sidewall of a resonant cavity 204, and the other end extends into the resonant cavity 204. One end of the output device 210 is connected to an output connector (not shown) outside the resonant cavity 204 through a sidewall of the other resonant cavity 204, and the other end extends into the resonant cavity 204.
所述屏蔽盒202為一密封結構，如：中空的立方體、長方體、棱柱體或圓柱體等。該屏蔽盒202的體積不限，可以根據實際情況設計。本實施例中，屏蔽盒202優選為一長方體，其長度為2厘米~20厘米，寬度為1厘米~10厘米，高度為1厘米~10厘米。該屏蔽盒202的材料為金屬或合金，優選為鋁。屏蔽盒202表面進一步包括一金屬電鍍層，優選為銀膜或銅膜，用來抑制互調失真。 The shielding box 202 is a sealed structure, such as a hollow cube, a rectangular parallelepiped, a prism or a cylinder. The volume of the shielding box 202 is not limited and can be designed according to actual conditions. In this embodiment, the shielding box 202 is preferably a rectangular parallelepiped having a length of 2 cm to 20 cm, a width of 1 cm to 10 cm, and a height of 1 cm to 10 cm. The material of the shielding box 202 is a metal or an alloy, preferably aluminum. The surface of the shield case 202 further includes a metal plating layer, preferably a silver film or a copper film, for suppressing intermodulation distortion.
所述隔離牆214為一金屬板或合金板，優選為鋁板。通常，採用鑄模的方法將隔離牆214與上述屏蔽盒202鑄為一體。該隔離牆214的厚度不限，其與屏蔽盒202的大小以及所要設計的腔體濾波器20的性能有關。該隔離牆214的厚度以及屏蔽盒202的大小決定諧振腔204的大小與諧振頻率。可以理解，屏蔽盒202越大，隔離牆214越薄，則諧振腔204越大，反之，則諧振腔204越小。本實施例中，隔離牆214的厚度優選為5毫米~2厘米。進一步，兩個諧振腔204的隔離牆214上開有一位於隔離牆214頂部中間位置的槽孔216。該槽孔216用來實現相鄰兩個諧振腔204之間的電容耦合。可以理解，於該槽孔216內還可以進一步設置一電容耦合元件(圖中未顯示)，用來調節相鄰兩個諧振腔204之間的電容耦合頻率。可以理解，本實施例的腔體濾波器20可以包括複數個隔離牆214，將屏蔽盒202內部空間分割為複數個諧振腔204，也可以沒有隔離牆214，即整個屏蔽盒202內部空間形成一個諧振腔204。 The partition wall 214 is a metal plate or an alloy plate, preferably an aluminum plate. Generally, the partition wall 214 is integrally molded with the above-described shield case 202 by a mold. The thickness of the partition wall 214 is not limited and is related to the size of the shield box 202 and the performance of the cavity filter 20 to be designed. The thickness of the partition wall 214 and the size of the shield box 202 determine the size and resonant frequency of the resonant cavity 204. It can be understood that the larger the shielding box 202 is, the thinner the partition wall 214 is, the larger the resonant cavity 204 is, and the smaller the resonant cavity 204 is. In this embodiment, the thickness of the partition wall 214 is preferably 5 mm to 2 cm. Further, the partition wall 214 of the two resonant cavities 204 is provided with a slot 216 at a position intermediate the top of the partition wall 214. The slot 216 is used to achieve capacitive coupling between two adjacent resonant cavities 204. It can be understood that a capacitive coupling element (not shown) can be further disposed in the slot 216 for adjusting the frequency of capacitive coupling between the adjacent two resonant cavities 204. It can be understood that the cavity filter 20 of the embodiment may include a plurality of isolation walls 214, and the internal space of the shielding box 202 is divided into a plurality of resonant cavities 204, or the isolation wall 214 may be omitted, that is, the entire internal space of the shielding box 202 forms a space. Resonant cavity 204.
所述諧振腔204為一密封空間，其形狀可以為立方體、長方體、圓柱體、橢圓柱體或多邊棱柱體等。該諧振腔204的大小不限，可以根據實際情況設計。本實施例中，諧振腔204優選為一立方 體，其邊長為1厘米~8厘米。可以理解，腔體濾波器20的諧振腔204數量不限，可以僅有一個諧振腔204，也可以根據實際情況設計至少兩個諧振腔204串聯或並聯設置。當一個腔體濾波器20包括複數個諧振腔204時，相鄰諧振腔204之間通過槽孔216以及設置於槽孔216內的電容耦合元件實現電容耦合。 The resonant cavity 204 is a sealed space and may be in the shape of a cube, a rectangular parallelepiped, a cylinder, an elliptical cylinder or a polygonal prism. The size of the resonant cavity 204 is not limited and can be designed according to actual conditions. In this embodiment, the resonant cavity 204 is preferably a cubic The body has a side length of 1 cm to 8 cm. It can be understood that the number of the resonant cavity 204 of the cavity filter 20 is not limited, and there may be only one resonant cavity 204. At least two resonant cavityes 204 may be designed to be connected in series or in parallel according to actual conditions. When a cavity filter 20 includes a plurality of resonant cavities 204, capacitive coupling is achieved between adjacent resonant cavities 204 through slots 216 and capacitive coupling elements disposed within slots 216.
所述支撐體218為一實心柱狀體或中空柱狀體，如：立方體、長方體、圓柱體、橢圓柱體或其他多邊棱柱體等。本實施例中，優選地，採用帶有底面的中空柱狀體作為支撐體218。可以理解，採用帶有底面的中空柱狀體可以節省材料，減輕重量，且底面可以用來固定。該支撐體218的大小可以根據實際情況設計。該支撐體218的底面可以通過螺釘或其他固定方式固定於屏蔽盒202內壁上，優選地，將支撐體218的底面固定於屏蔽盒202的底部內壁上，且使通過支撐體218上底面與下底面中點的中心軸與通過諧振腔204上底面與下底面中點的中心軸重合。本實施例中，支撐體218優選為一中空且帶有底面的圓柱體，其直徑為5毫米~5厘米，長度為1厘米~5厘米。該支撐體218採用絕緣低損耗材料製作，如：陶瓷、樹脂。本實施例中，支撐體218的材料優選為聚四氟乙烯。該支撐體218用來支撐奈米碳管結構220。 The support body 218 is a solid columnar body or a hollow columnar body, such as a cube, a rectangular parallelepiped, a cylinder, an elliptical cylinder or other polygonal prisms. In the present embodiment, it is preferable to use a hollow columnar body having a bottom surface as the support body 218. It can be understood that the use of a hollow cylindrical body with a bottom surface can save material, reduce weight, and the bottom surface can be used for fixing. The size of the support body 218 can be designed according to actual conditions. The bottom surface of the support body 218 can be fixed to the inner wall of the shielding box 202 by screws or other fixing means. Preferably, the bottom surface of the supporting body 218 is fixed on the bottom inner wall of the shielding box 202, and the bottom surface of the supporting body 218 is passed. The central axis of the midpoint of the lower bottom surface coincides with the central axis passing through the midpoint of the upper surface and the lower bottom surface of the resonant cavity 204. In this embodiment, the support body 218 is preferably a hollow cylindrical body having a bottom surface having a diameter of 5 mm to 5 cm and a length of 1 cm to 5 cm. The support body 218 is made of an insulating low loss material such as ceramic or resin. In this embodiment, the material of the support body 218 is preferably polytetrafluoroethylene. The support body 218 is used to support the carbon nanotube structure 220.
所述奈米碳管結構220設置於上述支撐體218的外表面形成一中空柱狀結構，其具體形狀取決於支撐體218的形狀。可以理解，本實施例中，當該支撐體218為一中空柱狀體時，所述奈米碳管結構220還可以進一步通過粘結劑粘結設置於支撐體218內表面。本實施例中，該奈米碳管結構220的長度、寬度以及厚度不限，可以根據實際需要選擇。可以理解，本實施例中可以製備一厚度較 小、長度較大的奈米碳管結構220多層重疊纏繞設置於支撐體218的外表面，也可以製備一厚度較大、長度較小的奈米碳管結構220單層包裹於支撐體218的外表面。所述奈米碳管結構220的寬度小於或等於支撐體218的的高度。所述設置於支撐體218的外表面的奈米碳管結構220的寬度與厚度越大，其表面電阻就越小，反之則表面電阻越大。而表面電阻大小會影響諧振子206的阻抗，從而影響腔體濾波器20的損耗。可以理解，奈米碳管結構220的電阻越大，腔體濾波器20的損耗也就越大，反之則損耗越小。 The carbon nanotube structure 220 is disposed on the outer surface of the support body 218 to form a hollow columnar structure, and the specific shape thereof depends on the shape of the support body 218. It can be understood that, in this embodiment, when the support body 218 is a hollow columnar body, the carbon nanotube structure 220 can be further disposed on the inner surface of the support body 218 by adhesive bonding. In this embodiment, the length, width and thickness of the carbon nanotube structure 220 are not limited, and may be selected according to actual needs. It can be understood that a thickness can be prepared in this embodiment. A small, long-length carbon nanotube structure 220 is stacked on the outer surface of the support body 218 in a plurality of layers, and a single-layer carbon nanotube structure 220 having a larger thickness and a smaller length can be prepared and wrapped in the support body 218. The outer surface. The width of the carbon nanotube structure 220 is less than or equal to the height of the support body 218. The larger the width and thickness of the carbon nanotube structure 220 disposed on the outer surface of the support 218, the smaller the surface resistance, and vice versa. The magnitude of the surface resistance affects the impedance of the resonator 206, thereby affecting the loss of the cavity filter 20. It can be understood that the greater the resistance of the carbon nanotube structure 220, the greater the loss of the cavity filter 20, and vice versa.
所述奈米碳管結構220為任意奈米碳管結構。該奈米碳管結構220可以包括無序排列或各向同性排列的奈米碳管，且奈米碳管相互纏繞。該奈米碳管結構220也可以包括沿一個固定方向擇優取向排列或沿不同方向擇優取向排列的奈米碳管。該奈米碳管結構220還可以包括至少一奈米碳管長線。該奈米碳管結構220由奈米碳管長線纏繞而成。所述的奈米碳管長線包括複數個首尾相連且擇優取向排列的奈米碳管束，且所述的奈米碳管束之間通過凡德瓦爾力緊密連接。 The carbon nanotube structure 220 is of any carbon nanotube structure. The carbon nanotube structure 220 may include a disordered or isotropically arranged carbon nanotubes, and the carbon nanotubes are intertwined with each other. The carbon nanotube structure 220 may also include carbon nanotubes arranged in a preferred orientation in a fixed orientation or in a preferred orientation in different directions. The carbon nanotube structure 220 can also include at least one nanotube long line. The carbon nanotube structure 220 is formed by winding a long carbon nanotube wire. The long carbon nanotube line comprises a plurality of carbon nanotube bundles arranged end to end and in a preferential orientation, and the carbon nanotube bundles are closely connected by a van der Waals force.
本實施例中，優選地，該奈米碳管結構220包括一奈米碳管薄膜或至少兩個平行且重疊鋪設的奈米碳管薄膜，且相鄰兩個奈米碳管薄膜之間通過凡德瓦爾力緊密連接。所述奈米碳管薄膜的厚度為0.01~100微米。所述奈米碳管薄膜包括複數個首尾相連且擇優取向排列的奈米碳管束。奈米碳管薄膜中的奈米碳管束的長度基本相同，所述奈米碳管束包括複數個具有相同長度且相互平行排列的奈米碳管，奈米碳管束之間通過凡德瓦爾力緊密連接。所述奈米碳管薄膜中的奈米碳管具有相同的排列方向。可以理解，由 複數個奈米碳管薄膜組成的奈米碳管結構220中，相鄰兩個奈米碳管薄膜中的奈米碳管的排列方向有一夾角α，且0°≦α≦90°。相鄰兩個奈米碳管薄膜中的奈米碳管束之間包括複數個微孔結構，該微孔結構均勻且規則分佈於奈米碳管結構中，其中微孔直徑為1奈米~0.5微米。 In this embodiment, preferably, the carbon nanotube structure 220 comprises a carbon nanotube film or at least two parallel and overlapping carbon nanotube films, and the adjacent two carbon nanotube films pass between Van der Valli is closely connected. The carbon nanotube film has a thickness of 0.01 to 100 μm. The carbon nanotube film comprises a plurality of carbon nanotube bundles arranged end to end and arranged in a preferred orientation. The length of the carbon nanotube bundle in the carbon nanotube film is substantially the same, and the carbon nanotube bundle comprises a plurality of carbon nanotubes having the same length and arranged in parallel with each other, and the carbon nanotube bundles are closely coupled by van der Waals force connection. The carbon nanotubes in the carbon nanotube film have the same alignment direction. Understandably, by In the carbon nanotube structure 220 composed of a plurality of carbon nanotube films, the arrangement of the carbon nanotubes in the adjacent two carbon nanotube films has an angle α and 0° ≦ α ≦ 90°. The carbon nanotube bundles in the adjacent two carbon nanotube films comprise a plurality of microporous structures uniformly and regularly distributed in the carbon nanotube structure, wherein the micropore diameter is from 1 nm to 0.5 Micron.
本實施例中，當所述夾角α=0，即奈米碳管結構220中的奈米碳管排列方向相同時，優選地，將奈米碳管結構220纏繞於支撐體218的外表面，且確保奈米碳管沿纏繞方向排列。該結構可以降低奈米碳管結構220形成的環路中的電阻。 In this embodiment, when the angle α=0, that is, the arrangement of the carbon nanotubes in the carbon nanotube structure 220 is the same, preferably, the carbon nanotube structure 220 is wound around the outer surface of the support body 218. Also ensure that the carbon nanotubes are aligned in the winding direction. This structure can reduce the electrical resistance in the loop formed by the carbon nanotube structure 220.
該奈米碳管薄膜中的奈米碳管為單壁奈米碳管、雙壁奈米碳管及多壁奈米碳管中的一種。該奈米碳管的長度為200~400微米，且具有較大的比表面積。當該奈米碳管薄膜中的奈米碳管為單壁奈米碳管時，該單壁奈米碳管的直徑為0.5奈米~50奈米。當該奈米碳管薄膜中的奈米碳管為雙壁奈米碳管時，該雙壁奈米碳管的直徑為1.0奈米~50奈米。當該奈米碳管薄膜中的奈米碳管為多壁奈米碳管時，該多壁奈米碳管的直徑為1.5奈米~50奈米。 The carbon nanotubes in the carbon nanotube film are one of a single-walled carbon nanotube, a double-walled carbon nanotube, and a multi-walled carbon nanotube. The carbon nanotubes have a length of 200 to 400 microns and have a large specific surface area. When the carbon nanotube in the carbon nanotube film is a single-walled carbon nanotube, the single-walled carbon nanotube has a diameter of 0.5 nm to 50 nm. When the carbon nanotube in the carbon nanotube film is a double-walled carbon nanotube, the double-walled carbon nanotube has a diameter of 1.0 nm to 50 nm. When the carbon nanotube in the carbon nanotube film is a multi-walled carbon nanotube, the diameter of the multi-walled carbon nanotube is 1.5 nm to 50 nm.
所述輸入裝置208與輸出裝置210為一導電體，如：金屬桿。本實施例中，優選為一銅金屬桿。該輸入裝置208與輸出裝置210的一端固定於屏蔽盒202的內壁上，且與屏蔽盒202電連接，另一端延伸至諧振腔204內。該輸入裝置208與輸出裝置210延伸至諧振腔204內的一端，可以與諧振子206表面的奈米碳管結構220接觸，也可以與諧振子206保持一間隔設置。當所述腔體濾波器20僅包括一個諧振腔204時，該輸入裝置208與輸出裝置210設置於該諧振腔204內，且分別連接到屏蔽盒202的不同內壁上。當所述腔體 濾波器20包括至少兩個諧振腔204時，該輸入裝置208與輸出裝置210分別設置於第一級諧振腔204與最後一級諧振腔204內。所述輸入裝置208與輸出裝置210的直徑與長度可以根據實際情況選擇。本實施例中，輸入裝置208與輸出裝置210優選為直徑為1毫米~5毫米，長度為5毫米~3厘米的金屬桿。本實施例中，輸入裝置208與輸出裝置210可以對換使用。 The input device 208 and the output device 210 are an electrical conductor, such as a metal rod. In this embodiment, a copper metal rod is preferred. One end of the input device 208 and the output device 210 is fixed on the inner wall of the shielding box 202, and is electrically connected to the shielding box 202, and the other end extends into the resonant cavity 204. The input device 208 and the output device 210 extend to one end of the resonant cavity 204, may be in contact with the carbon nanotube structure 220 on the surface of the resonator 206, or may be spaced apart from the resonator 206. When the cavity filter 20 includes only one resonant cavity 204, the input device 208 and the output device 210 are disposed in the resonant cavity 204 and are respectively connected to different inner walls of the shielding box 202. When the cavity When the filter 20 includes at least two resonant cavities 204, the input device 208 and the output device 210 are disposed in the first-stage resonant cavity 204 and the last-stage resonant cavity 204, respectively. The diameter and length of the input device 208 and the output device 210 can be selected according to actual conditions. In this embodiment, the input device 208 and the output device 210 are preferably metal rods having a diameter of 1 mm to 5 mm and a length of 5 mm to 3 cm. In this embodiment, the input device 208 and the output device 210 can be used interchangeably.
另外，所述腔體濾波器20可以進一步包括至少一個調頻器212設置於諧振腔204內，且調頻器212與諧振子206以及輸入/輸出裝置間隔設置。本實施例中，優選地，每個諧振腔204內設置相同數量的調頻器212。所述調頻器212一段固定於屏蔽盒202的內壁上，另一端延伸至諧振腔204內。該調頻器212通常為一裝有調頻螺母的金屬管，用來調節腔體濾波器20的諧振頻率。 In addition, the cavity filter 20 may further include at least one frequency modulator 212 disposed in the resonant cavity 204, and the frequency modulator 212 is spaced apart from the harmonic oscillator 206 and the input/output device. In this embodiment, preferably, the same number of frequency modulators 212 are disposed in each of the resonant cavities 204. The frequency modulator 212 is fixed to the inner wall of the shielding box 202 and extends to the resonant cavity 204 at the other end. The frequency modulator 212 is typically a metal tube with a frequency modulation nut for adjusting the resonant frequency of the cavity filter 20.
該腔體濾波器20工作時，微波訊號由輸入裝置208輸入諧振腔內204內，經過腔體濾波器20的等效諧振電路的過濾後，所選用的微波訊號由輸出裝置210輸出。本技術方案實施例提供的腔體濾波器20，諧振子206包括一支撐體218以及一奈米碳管結構220設置於該支撐體表面，由於奈米碳管電阻率低，故，該腔體濾波器20的歐姆損耗低。而且，該奈米碳管結構220具有良好的導電性能且本身的比表面積大，制得的腔體濾波器20的功率容量大。另外，由於奈米碳管密度小，故，該腔體濾波器20的重量輕，使用方便。 When the cavity filter 20 is in operation, the microwave signal is input into the cavity 204 by the input device 208. After filtering by the equivalent resonant circuit of the cavity filter 20, the selected microwave signal is output by the output device 210. The cavity filter 20 provided by the embodiment of the present technical solution includes a support body 218 and a carbon nanotube structure 220 disposed on the surface of the support body. Since the carbon nanotube has low resistivity, the cavity The ohmic loss of the filter 20 is low. Moreover, the carbon nanotube structure 220 has good electrical conductivity and a large specific surface area, and the power capacity of the resulting cavity filter 20 is large. In addition, since the density of the carbon nanotubes is small, the cavity filter 20 is light in weight and convenient to use.
綜上所述，本發明確已符合發明專利之要件，遂依法提出專利申請。惟，以上所述者僅為本發明之較佳實施例，自不能以此限制本案之申請專利範圍。舉凡習知本案技藝之人士援依本發明之精 神所作之等效修飾或變化，皆應涵蓋於以下申請專利範圍內。 In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Anyone who knows the skill of this case will be able to Equivalent modifications or variations made by God are to be covered by the following patents.
20‧‧‧濾波器 20‧‧‧ filter
202‧‧‧屏蔽盒 202‧‧‧Shielding box
204‧‧‧諧振腔 204‧‧‧Resonator
206‧‧‧諧振子 206‧‧‧Visson
208‧‧‧輸入裝置 208‧‧‧ input device
210‧‧‧輸出裝置 210‧‧‧ Output device
212‧‧‧調頻器 212‧‧‧frequency modulator
214‧‧‧隔離牆 214‧‧‧The wall
216‧‧‧槽孔 216‧‧‧ slots
218‧‧‧支撐體 218‧‧‧Support
220‧‧‧奈米碳管結構 220‧‧‧Nano carbon nanotube structure
Claims (17)
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5329687A (en) * | 1992-10-30 | 1994-07-19 | Teledyne Industries, Inc. | Method of forming a filter with integrally formed resonators |
| US7045108B2 (en) * | 2002-09-16 | 2006-05-16 | Tsinghua University | Method for fabricating carbon nanotube yarn |
| US7082683B2 (en) * | 2003-04-24 | 2006-08-01 | Korea Institute Of Machinery & Materials | Method for attaching rod-shaped nano structure to probe holder |
| US7189430B2 (en) * | 2002-02-11 | 2007-03-13 | Rensselaer Polytechnic Institute | Directed assembly of highly-organized carbon nanotube architectures |
| TW200722368A (en) * | 2005-12-02 | 2007-06-16 | Hon Hai Prec Ind Co Ltd | A method for making carbon nanotube device |
| TW200802508A (en) * | 2006-06-30 | 2008-01-01 | Hon Hai Prec Ind Co Ltd | Field emission componet and method for making same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5329687A (en) * | 1992-10-30 | 1994-07-19 | Teledyne Industries, Inc. | Method of forming a filter with integrally formed resonators |
| US7189430B2 (en) * | 2002-02-11 | 2007-03-13 | Rensselaer Polytechnic Institute | Directed assembly of highly-organized carbon nanotube architectures |
| US7045108B2 (en) * | 2002-09-16 | 2006-05-16 | Tsinghua University | Method for fabricating carbon nanotube yarn |
| US7082683B2 (en) * | 2003-04-24 | 2006-08-01 | Korea Institute Of Machinery & Materials | Method for attaching rod-shaped nano structure to probe holder |
| TW200722368A (en) * | 2005-12-02 | 2007-06-16 | Hon Hai Prec Ind Co Ltd | A method for making carbon nanotube device |
| TW200802508A (en) * | 2006-06-30 | 2008-01-01 | Hon Hai Prec Ind Co Ltd | Field emission componet and method for making same |
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