201234706 六、發明說明： [0001] [0002] Ο [0003] [0004] 【發明所屬之技術領域】 本發明涉及濾波器，尤其涉及一種低通濾波器。 【先前技術] 遽波器作為電子訊號處理系統中的關鍵器件，具有通過 有用訊號和抑制干擾訊號的作^在電路設計中，一般 會在傳送放大器之後’加入-個低通濾波器 放大器的二倍頻諧波和三倍頻諧波。 然而’如何設計一&可抑制二倍頻諧波和 低通渡波器是當前_一:大挑..戰 【發明内容】 ' / 鑒於以上内容，有必要提供一種低通濾波器， 倍頻諧波和三倍頻諧波。 來抑制傳送 倍續错攻的 可抑制二 [0005] 埠、 第 本發明實施方式中提供的低通濾波器’包括第 二埠、訊號傳輸線、兩個滅路傳输線、第一執合傳 及第二耦合傳輸線》訊號傳輸線連％於第一i皁與第 之間，用於將射頻訊號從第一淳傳輸至第二蜂， ^ 訊*楚 傳輸線的相對兩侧分別為第一侧與第二側。兩彻ρβ %個開路傳 輸線位於該訊號傳輸線的第一側且为別垂直連接於 號傳輸線上靠近該第一埠與該第二埠處’該兩甸開路 輸線與該訊號傳輸線之間形成Τ形間隙。第一執合傳輪 與該訊號傳輸線平行且設置於該7形間隙内，讀楚）線 傳輸線設有第一孔β第二耦合傳輸線與該訊镜傳輪線平3 行且位於該訊號傳輸線的第二側’该第二麵合傳輪線^ 有第二孔。 100104618 表單編號Α0101 第5頁/共28頁 201234706 [0006] 優選地，兩個開路傳輸線包括第一開路傳輸線與第二開 路傳輸線。第一開路傳輸線包括呈矩形的第一連接部與 呈矩形的第一開路部，該第一連接部垂直連接於該訊號 傳輸線與該第一開路部之間，該第一連接部的寬度比該 第一開路部的寬度窄。第二開路傳輸線包括呈矩形的第 二連接部與呈矩形的第二開路部，該第二連接部垂直連 接於該訊號傳輸線與該第二開路部之間，該第二連接部 的寬度比該第二開路部的寬度窄。其中，該第一連接部 、該第二連接部與該訊號傳輸線之間形成第一間隙；該 第一開路部與該第二開路部相對形成第二間隙。該第一 間隙與該第二間隙共同構成該T形間隙。 [0007] 優選地，該訊號傳輸線包括依次連接的第一匹配部、主 訊號傳輸部及第二匹配部，該第一匹配部連接於該第一 埠與該主訊號傳輸部之間，該第二匹配部連接於該第二 埠與該主訊號傳輸部之間。 [0008] 優選地，該第一匹配部由不少於三段的不同寬度微帶組 成，微帶寬度由該第一埠向該主訊號傳輸部逐漸變窄， 以達到阻抗匹配的效果；該第二匹配部由不少於三段的 不同寬度微帶組成，微帶寬度由該主訊號傳輸部向該第 二埠逐漸變寬，以達到阻抗匹配的效果。 [0009] 優選地，該第一孔設置於該第一耦合線的兩端之一或中 部，該第二孔設置於該第二耦合線的兩端之一或中部。 [0010] 優選地，該第一孔設置於該第一耦合線上靠近該第二埠 的一端，該第二孔設置於該第二耦合線上靠近該第一埠 100104618 表單編號A0101 第6頁/共28頁 1002008039-0 201234706 [0011] [0012] 〇 [0013] 的一端。 1 藉由以下對具體實施方式詳細的描述結合附圖，將可輕 易的瞭解上述内容及此項發明之諸多優點。 【實施方式】 圖1是本發明低通濾波器100—實施方式的示意圖。在本 實施方式中，低通濾波器100包括第一埠u、第二埠12、 訊號傳輸線10、第一開路傳輸線21、第二開路傳輪線22 、第一耦合傳輸線31、第二耦合傳輸線32。 訊號傳輸線10連接於第一埠J1與第二琿12之間，用於將 射頻訊號從第一埠丨丨傳輸至第.二埠42、。為描述的方便， 將訊號傳輸線l〇的相對兩侧分別定義為第一倒101與第二 側 1 0 2 » 、 [0014]201234706 VI. Description of the Invention: [0001] [0002] [0003] The present invention relates to filters, and more particularly to a low pass filter. [Prior Art] As a key device in the electronic signal processing system, the chopper has a useful signal and suppresses the interference signal. In the circuit design, it is generally added to the low-pass filter amplifier after the transmission amplifier. Multiplier harmonics and triple harmonics. However, 'how to design a & can suppress the double harmonics and the low-pass waver is the current one. _一:大挑..战[发明发明] ' / In view of the above, it is necessary to provide a low-pass filter, multiplier Harmonics and triple harmonics. The suppression of the transmission of the continuation error can be suppressed. [0005] The low-pass filter provided in the embodiment of the present invention includes a second 埠, a signal transmission line, two eliminator transmission lines, and a first escaping transmission. And the second coupled transmission line "signal transmission line" is connected between the first i soap and the first portion, and is used for transmitting the radio frequency signal from the first to the second bee, and the opposite sides of the transmission line are respectively the first side and The second side. The two ρβ% open transmission lines are located on the first side of the signal transmission line and are formed on the first transmission line and the second ' near the first transmission line and the second transmission line. Shape gap. The first binding transmission wheel is parallel to the signal transmission line and disposed in the 7-shaped gap, and the line transmission line is provided with a first hole β. The second coupling transmission line is parallel to the signal transmission line and is located at the signal transmission line. The second side of the second side of the transfer wheel ^ has a second hole. 100104618 Form Number Α 0101 Page 5 of 28 201234706 [0006] Preferably, the two open transmission lines include a first open transmission line and a second open transmission line. The first open transmission line includes a first connecting portion having a rectangular shape and a first opening portion having a rectangular shape. The first connecting portion is vertically connected between the signal transmission line and the first open portion. The width of the first connecting portion is larger than the The width of the first open portion is narrow. The second open transmission line includes a second connecting portion having a rectangular shape and a second open portion having a rectangular shape. The second connecting portion is vertically connected between the signal transmission line and the second open portion. The width of the second connecting portion is larger than the The width of the second open portion is narrow. A first gap is formed between the first connecting portion and the second connecting portion and the signal transmission line; and the first open portion and the second open portion form a second gap. The first gap and the second gap together form the T-shaped gap. [0007] Preferably, the signal transmission line includes a first matching unit, a main signal transmission unit and a second matching unit, which are connected in sequence, and the first matching unit is connected between the first unit and the main signal transmission unit. The second matching unit is connected between the second unit and the main signal transmission unit. [0008] Preferably, the first matching portion is composed of not less than three segments of different width microstrips, and the microstrip width is gradually narrowed from the first to the main signal transmission portion to achieve an impedance matching effect; The second matching portion is composed of not less than three segments of different width microstrips, and the microstrip width is gradually widened by the main signal transmission portion toward the second chirp to achieve an impedance matching effect. [0009] Preferably, the first hole is disposed at one or the middle of the two ends of the first coupling line, and the second hole is disposed at one or the middle of the two ends of the second coupling line. [0010] Preferably, the first hole is disposed on an end of the first coupling line adjacent to the second cymbal, and the second hole is disposed on the second coupling line adjacent to the first 埠100104618 Form No. A0101 Page 6 / Total 28 pages 1002008039-0 201234706 [0011] [0012] One end of [0013]. BRIEF DESCRIPTION OF THE DRAWINGS The above and other advantages of the invention will be readily apparent from the following detailed description of the embodiments. Embodiments Fig. 1 is a schematic view of an embodiment of a low pass filter 100 of the present invention. In the present embodiment, the low pass filter 100 includes a first 埠u, a second 埠12, a signal transmission line 10, a first open transmission line 21, a second open transmission line 22, a first coupled transmission line 31, and a second coupled transmission line. 32. The signal transmission line 10 is connected between the first 埠J1 and the second 珲12 for transmitting the RF signal from the first 第 to the second 埠42. For the convenience of description, the opposite sides of the signal transmission line 10 are respectively defined as the first inverted 101 and the second side 1 0 2 » , [0014]
在本發明實施方式中，訊號傳輸線10包括依次連接的第 一匹配部13、主訊號傳輸部15及第二匹配部14。第一匹 配部13連接於第一埠Π與主訊號傳輪部15之間，第一匹 配部13由不少於三段的不同寬名微:帶組 第一和向主·傳輸部15逐漸“，卜•帶寬度由 的效果。第二匹配部14連接於第二埠l2 X達到阻抗匹配 15之間，第二匹配部14由不少於三俨2與主釩號傳輪部 成’微帶寬度由主訊號傳輸部15向帛的不同寬度微帶組 以達到阻抗匹配的效果。 〜棒12逐漸變寬， [0015] 100104618 /、木——丁 agg阻抗〜 Ohm)，而主訊號傳輸部15的阻抗— 埏為50歐姆（ 帶線寬度越寬，則其阻抗越小，=帶餃為9〇歐姆。根據微 矣置…隱 — 線趣窄’則其阻抗 表單編號A0I01 第7頁/共28頁 1002008039-0 201234706 越大的原理’第一匹配部13藉由微帶寬度由第一埠11向 主訊號傳輸部15逐漸變窄，將阻抗由50歐姆逐漸轉變為 90歐姆。同理，第二匹配部丨4可藉由微帶寬度由主訊號 傳輸部15向第二埠12逐漸變寬，將阻抗由90歐姆逐漸轉 變為50歐姆。在本實施方式中，第一匹配部13或第二匹 配部14的微帶線寬度的變化是圖1所示的階梯式的。根據 上述原理’本領域一般技術人員可以用其它的實施方式 來實現’例如第一匹配部13或第二匹配部14可以是梯形 或三角形。 [0016] [0017] [0018] [0019] 第一開路傳輸線21與第二開路傳輪線2 2位於訊號傳輸線 10的第一侧101且分別垂直連接於訊號傳輸線1〇上靠近第 一埠11與第二埠12處。第一開路傳=輪線21、第二開路傳 輸線22及訊號傳輸線1〇之間共同形成τ形間隙4〇。在本發 明實施方式中，該T形間隙4 〇由矩形的第一間隙41與垂直 連通於該第一間隙41中部的第二間隙42共同形成。 j 第一開路傳輸線21包括呈矩形的第一連接部2丨丨與呈矩形 的第一開路部212 »第一連接部211垂直連接於訊號傳輸 線10與第一開路部212之間，第一連接部211的寬度比第 一開路部212的寬度窄。 第二開路傳輸線22包括呈矩形的第二連接部221與呈矩形 的第二開路部222。第二連接部221垂直連接於訊號傳輸 線10與第二開路部222之間，第二連接部221的寬度比第 二開路部222的寬度窄。 第一連接部211、第二連接部221與訊號傳輸線1〇之間形 100104618 表單編號Α0101 第8頁/共28頁 1002008039-0 201234706 [0020] [0021] Ο [0022] Ο [0023] [0024] 100104618 成第一間隙41。第一開路部212與第二開路部222之間形 成第二間隙42。 第一耦合傳輸線31與訊號傳輸線10平行且設置於第一間 隙41内。第一耦合傳輸線31設有第一孔31a。在本實施方 式中，該第一孔31a可設置於第一耦合傳輸線31上靠近第 二埠12的一端。 第二辆合傳輸線32與訊號傳輸線10平行且位於訊號傳輸 線10的第二側102。第二耦合傳輸線32設有第二孔32a ° 在本實施方式中，該第二孔32a設置於第二耦合傳輸線32 ..... ... ..： .. 上靠近第一槔11的一端。 應當注意的是，圖1中的低通濾波赛Ϊ(Η)僅為本發明的一 種較佳實施例，本領域技術人員依本案發明精神可作等 效修飾或變化，如圖2-6所示，本領域技術人員可將圖1 中的第一孔31a設置於第一耦合傳輸線31的兩端之一或中 部’第二孔32a設置於第二耦合傳輸線32的兩端之一或中 部。 — 在低通濾波器100中，藉由訊號傳4線10、第一開路傳輸 線21、第二開路傳輸線22共同形成如圖7所示的7Γ型濾波 器，可有效抑制二倍頻諧波。 另外，藉由設有第一孔31a的第一耦合傳輸線31與設有第 二孔32a的第二耦合傳輸線32，本發明低通濾波器1〇〇可 以有效抑制三倍頻諧波。 圖8是本發明低通濾波器100的等效電路圖。在本實施方 式中’圖1中主訊號傳輸部15可為阻抗值為9〇歐姆的微帶 表單編號A0101 第Θ頁/共28頁 1002008039-0 [0025] 201234706 線。圖1中第一埠11與第二埠12即為圖8中的第一埠？1與 第一埠P2，其阻抗值均為50歐姆。圖1中第—匹配部13可 4效為圖8中第一電感L1，第一電感L1連接於第一埠pi與 主訊號傳輸部1 5之間，第一電感L1可產生阻抗變化效果 ，以達到阻抗匹配效果。圖}中的第二匹配部14可等效為 圖8中第二電感L2，第二電感L2連接於主訊號傳輸部15與 第二埠P2之間，第二電感L2可產生阻抗變化效果，以達 到阻抗匹配效果。 [0026] 圖1中第一開路傳輸線21可等效為圖8中第一電容C1 ,第 一電容C1 一端透過節點ni連接於主訊號傳輸部15，另一 端接地，故，第一電容C1可透過節點“將主訊號傳輸部 15上傳輸的一倍頻諧波麵合到地，從而抑制二倍頻諧波 。圖1中第二開路傳輸線22可等效為圖8中第二電容C2， 第二電容C2—端透過節點n2連接於主訊號傳輸部15，另 一端接地，故，第二電容C2可透過節點n2將主訊號傳輸 部15上傳輸的二倍頻諧波搞奋到地，從而抑制二倍頻譜 波。 [0027] 圖1中設有第一孔31a的第一耦合傳輸線31可等效為圖8中 串連在節點n3與地之間的第三電容C3與第三電感L3，第 二電容C3與第三電感L3可透過節點η3將主訊號傳輸部15 上傳輸的三倍頻諧波耦合到地，從而抑制三倍頻諧波。 圖1中設有第二孔32a的第二耦合傳輸線32可等效為圖8中 串連在節點n4與地之間的第四電容C4與第四電感L4，第 四電谷C4與第四電感L4可透過節點n4將主訊號傳輸部15 上傳輸的三次猎波轉合到地，從而抑制三倍頻|皆波。 100104618 表單編號A0101 第10頁/共28頁 1002008039-0 201234706 [0028] Ο [0029]In the embodiment of the present invention, the signal transmission line 10 includes a first matching unit 13, a main signal transmission unit 15, and a second matching unit 14, which are sequentially connected. The first matching portion 13 is connected between the first port and the main signal transmitting portion 15, and the first matching portion 13 is composed of different width names of not less than three segments: the band group first and the main transmission portion 15 gradually ", the effect of the belt width is. The second matching portion 14 is connected between the second 埠l2 X and the impedance matching 15 , and the second matching portion 14 is formed by the not less than three 俨 2 and the main vanadium wheel portion. The microstrip width is matched by the main signal transmitting portion 15 to the different width microstrip groups of the crucible to achieve the effect of impedance matching. The bar 12 is gradually widened, [0015] 100104618 /, wood - Ding agg impedance ~ Ohm), and the main signal The impedance of the transmission portion 15 - 埏 is 50 ohms (the wider the line width, the smaller the impedance, = 9 ohms with dumplings. According to the micro 矣 ... hidden - the line is narrow), its impedance form number A0I01 7 Page / Total 28 pages 1002008039-0 201234706 The larger the principle, the first matching portion 13 is gradually narrowed from the first turn 11 to the main signal transmission portion 15 by the microstrip width, and the impedance is gradually changed from 50 ohms to 90 ohms. Similarly, the second matching portion 可4 can be gradually widened from the main signal transmission portion 15 to the second cymbal 12 by the microstrip width. The impedance is gradually changed from 90 ohms to 50 ohms. In the present embodiment, the variation of the microstrip line width of the first matching portion 13 or the second matching portion 14 is stepped as shown in Fig. 1. According to the above principle, the field A person skilled in the art can implement other embodiments. For example, the first matching portion 13 or the second matching portion 14 may be trapezoidal or triangular. [0017] [0019] [0019] The first open transmission line 21 and the second The open circuit transmission line 2 2 is located on the first side 101 of the signal transmission line 10 and is vertically connected to the signal transmission line 1 靠近 adjacent to the first 埠 11 and the second 埠 12, respectively. The first open circuit = the wheel line 21 and the second open transmission line 22 and the signal transmission line 1 共同 together form a zigzag gap 4 〇. In the embodiment of the present invention, the T-shaped gap 4 〇 is a rectangular first gap 41 and a second gap vertically communicating with the middle of the first gap 41 42. The first open transmission line 21 includes a rectangular first connecting portion 2 and a rectangular first open portion 212. The first connecting portion 211 is vertically connected between the signal transmission line 10 and the first open portion 212. , the width of the first connecting portion 211 The second open transmission line 22 includes a rectangular second connecting portion 221 and a rectangular second open portion 222. The second connecting portion 221 is perpendicularly connected to the signal transmission line 10 and the second open portion. Between 222, the width of the second connecting portion 221 is narrower than the width of the second open portion 222. The first connecting portion 211, the second connecting portion 221 and the signal transmission line 1〇 are shaped 100104618 Form No. Α0101 Page 8 of 28 Page 1002008039-0 201234706 [0020] [0022] [0024] 100104618 is the first gap 41. A second gap 42 is formed between the first open portion 212 and the second open portion 222. The first coupling transmission line 31 is parallel to the signal transmission line 10 and disposed in the first gap 41. The first coupling transmission line 31 is provided with a first hole 31a. In the present embodiment, the first hole 31a may be disposed on an end of the first coupling transmission line 31 adjacent to the second winding 12. The second carrier transmission line 32 is parallel to the signal transmission line 10 and is located on the second side 102 of the signal transmission line 10. The second coupling transmission line 32 is provided with a second hole 32a. In the embodiment, the second hole 32a is disposed on the second coupling transmission line 32 ..... . . . One end. It should be noted that the low-pass filter cell (Η) in FIG. 1 is only a preferred embodiment of the present invention, and those skilled in the art can make equivalent modifications or changes according to the spirit of the present invention, as shown in FIG. 2-6. The first hole 31a in FIG. 1 can be disposed at one of the two ends or the middle portion of the first coupling transmission line 31. The second hole 32a is disposed at one or both ends of the second coupling transmission line 32. - In the low-pass filter 100, the signal transmission line 4, the first open transmission line 21, and the second open transmission line 22 together form a 7-turn type filter as shown in Fig. 7, which can effectively suppress the double-frequency harmonics. Further, the low-pass filter 1A of the present invention can effectively suppress the triple harmonics by the first coupling transmission line 31 provided with the first hole 31a and the second coupling transmission line 32 provided with the second hole 32a. FIG. 8 is an equivalent circuit diagram of the low pass filter 100 of the present invention. In the present embodiment, the main signal transmission portion 15 in Fig. 1 may be a microstrip with an impedance value of 9 〇. Form No. A0101 Page/Total 28 pages 1002008039-0 [0025] 201234706 Line. The first 埠 11 and the second 埠 12 in FIG. 1 are the first 图 in FIG. 8? 1 and the first 埠P2, the impedance value is 50 ohms. In FIG. 1 , the first matching portion 13 can be the first inductor L1 in FIG. 8 , and the first inductor L1 is connected between the first 埠 pi and the main signal transmitting portion 15 , and the first inductor L1 can generate an impedance change effect. To achieve impedance matching. The second matching portion 14 in FIG. 5 can be equivalent to the second inductor L2 in FIG. 8, and the second inductor L2 is connected between the main signal transmitting portion 15 and the second 埠P2, and the second inductor L2 can generate an impedance change effect. To achieve impedance matching. The first open circuit transmission line 21 in FIG. 1 can be equivalent to the first capacitor C1 in FIG. 8. One end of the first capacitor C1 is connected to the main signal transmission portion 15 through the node ni, and the other end is grounded. Therefore, the first capacitor C1 can be The node "converts the double-frequency harmonic transmitted on the main signal transmission portion 15 to the ground, thereby suppressing the double-frequency harmonic. The second open transmission line 22 in FIG. 1 can be equivalent to the second capacitor C2 in FIG. The second capacitor C2 is connected to the main signal transmission unit 15 through the node n2, and the other end is grounded. Therefore, the second capacitor C2 can excite the second harmonics transmitted on the main signal transmission unit 15 to the ground through the node n2. Thereby, the double spectral wave is suppressed. [0027] The first coupling transmission line 31 provided with the first hole 31a in FIG. 1 can be equivalent to the third capacitance C3 and the third inductance serially connected between the node n3 and the ground in FIG. L3, the second capacitor C3 and the third inductor L3 can couple the triple harmonics transmitted on the main signal transmission portion 15 to the ground through the node η3, thereby suppressing the triple harmonics. The second hole 32a is provided in FIG. The second coupled transmission line 32 can be equivalent to the fourth capacitor C4 and the fourth connected in series between the node n4 and the ground in FIG. The sense L4, the fourth electric valley C4 and the fourth inductance L4 can transmit the three hunting waves transmitted on the main signal transmitting portion 15 to the ground through the node n4, thereby suppressing the triple frequency | all waves. 100104618 Form No. A0101 Page 10 / Total 28 pages 1002008039-0 201234706 [0028] Ο [0029]
[0030] 圖9是本發明低通濾波器ι〇0一實施方式的尺寸圖。在本 發明一具體實施例中，第一匹配部13與第二匹配部14關 於主訊號傳輸部15的中垂線呈軸對稱，故僅描述第一匹 配部13的尺寸，第一匹配部13的寬度先由34mil變為 18mil ’再變為12mil，其中寬度為34mil、18mU、 12mil的長度分別為i5mil、17mil、17mil。第一開路 傳輸線21與第二開路傳輸線22的長度均為173mil，寬度 均為（34 + 66)mi 1 »第一 ·、二開路傳輸線21、22的第一、 一開路部212、222的長度為129mil。第一輕合傳輸線31 的長度為151mil，寬度為28mil。第一孔31a的圓心離第 二連接部221的距離為20mil。第二耦合傳轉線32的長度 為151mil ’寬度為28mil，離訊號傳輸線10的距離為（ 36-28 ) mil，第二孔32a的圓心離第二耦合傳輸線32的 較近一端的距離為l〇mil« 圖1 0是本發明低通濾波器10〇的π型濾波器（如圖7所示 )一實施方式的諧波抑制效果圖。在本實施方式中，如 圖7所示的7Γ型濾凌器應用於3:· 5GHz的WiMAX頻段，通訊 行規中工作頻率（如3.5GHz)的反射損耗（Return Loss)要在-10dB以下，二倍頻諧波（如7.5GHz)的插 入損耗（Insertion Loss)要在-40db以下，三倍頻言皆 波（如10. 5GHz)的插入損耗要在-20db以下。 圖10中S1代表反射損耗曲線圖，S2代表插入損耗曲線圖 。從圖10中S1可以明顯看出’當工作頻率χ=3. 5GHz時反 射損耗Y在-10dB以下，說明3. 5GHz的射頻訊號可以在第 一埠11與第二埠12之間傳遞；當工作頻率 100104618 表單編號A0101 第11頁/共28頁 1002008039-0 201234706 X = 7.5-10.5GHz時反射損耗γ約等於〇dB，說明 7.5-10. 5GHz射頻訊號並不能在第一埠丨丨與第二埠。之 間傳遞。 [0031] [0032] [0033] [0034] 從圖中S2可以明顯看出，當工作頻率η.時插入 損耗Y=-G. 44 ’並不會對卫作頻段3. 5GHz附近頻段造成 抑制；當工作頻率X = 6.8〇_7.2GHz時插入損耗 Y = -49. 69-55. 89GHz，此時插入損耗均在.—下， 說明可有效抑制6.80_7.2GHz之間的二倍頻譜波。當工 作頻率X = 1 0. 20-1 0. 80GHz時插入損耗 Y = -10. 72-4. 45GHz ’此時插人損耗均在__以上說 明並不能有效抑制H). 2Q_1Q.:職Hz之間的三倍頻譜波。 總的來說’圖7中的π型渡波:器結身可以有效抑制二倍頻 諧波，但並不能有效抑制三倍頻諧波。 圖11是本發明低通遽波器⑽（如圖i所示）—實施方式 的諸波抑制效果圖。在本實施方式中，如m所示的低通 濾波器100應用於3. 5Ghz的WiMAX頻段。 圖11中S3代表反射損耗曲線圖，S4代表插人損耗曲線圖 。攸圖11中S3可以明顯看出，當工作頻率χ=3. 5GHz時反 射損耗γ在-1隨以下，說明3 5GHz的射頻訊號可以在第 一埠11與第二埠12之間傳遞；當工作頻率 X=7. 5-10. 5GHz時反射損耗γ約等於〇dB，說明 7. 5-10. 5GHz射頻訊號並不能在第—和與第二蜂以 間傳遞。 從圖11中S4的可以a月顯看出，當工作頻率χ = 3 6GHz時插 100104618 表單煸號A0101 第12頁/共28頁 1002008039-0 201234706 入損耗Υ = -0. 3 7db，並不會對工作頻段3. 5GHz附近頻段 造成抑制；當工作頻率χ = 80-7. 20GHz時插入損耗 Y- 55. 94_59. 97GHz，此時插入損耗均在在以下 ，說明有效地抑制了二倍頻諧波。當工作頻率 Χ = 10· 20-1 0. 80GHz時插入損耗Y = -33. 75-24. 98GHz， 此時插入損耗均在-20db以下’說明有效地抑制了三倍頻 諧波。總的來說’圖1中的低通濾波器1〇〇不僅有效抑制 二倍頻諧波，而且有效抑制三倍頻諧波。 [0035] Ο [0036] [0037] [0038] Ο [0039] [0040] [0041] [0042] [0043] [0044] 100104618 綜上所述，本發明符合發明專利.要.件.，爰依法提出專利 申請。惟，以上所述僅為本發明之較佳實施例，舉凡熟 悉本案技藝之人士，在爰依本案發明猜神所'作之等效修 飾或變化，皆應包含於以下之申讀專利範園.内。 【圖式簡單說明】 圖1為本發明低通遽波器一實施方式的彔意圖。 圖2為本發明低通遽波器另一實施方式的示意圖。 圖3為本發明低通滤波器又一實施方式的示意圖。 圖4為本發明低通渡波器又一實施方式的示意圖。 圖5為本發明低通濾波器又一實施方式的示意圖。 圖6為本發明低通濾波器又一實施方式的示意圖。 圖7為本發明低通濾波器的7Γ型濾波器一實施方式的示意 圖。 圖8為本發明低通濾波器一實施方式的等效電路圖。 圖9為本發明低通濾波器一實施方式的尺寸圖。 表單編號A0101 第13頁/共28頁 1002008039-0 201234706 [0045] 圖1 0為本發明低通濾波器的ττ型濾波器一實施方式的諧 波抑制效果圖。 [0046] 圖11為本發明低通濾波器一實施方式的諧波抑制效果圖 【主要元件符號說明】 [0047] 低通濾波器： 100 [0048] 訊號傳輸線： 10 [0049] 第 一埠：11 [0050] 第 二埠：12 [0051] 第 一匹配部： 13 [0052] 第 二匹配部： 14 [0053] 主 訊號傳輸部 ：15 [0054] 第 一側：101 [0055] 第 二側：102 [0056] 第 一開路傳輸線： [0057] 第 一連接部： 211 [0058] 第 一開路部： 212 [0059] 第 二開路傳輸線： [0060] 第 二連接部： 221 [0061] 第 二開路部： 222 100104618 表單編號Α0101 第14頁/共28頁 1002008039-0 201234706 [0062] 第一耦合傳輸線：31 [0063] 第一孔：31 a [0064] 第二耦合傳輸線：32 [0065] 第二孔：32a [0066] T形間隙：40 [0067] 第一間隙：41 [0068] 第二間隙：429 is a dimensional view of an embodiment of a low pass filter ι〇0 of the present invention. In a specific embodiment of the present invention, the first matching portion 13 and the second matching portion 14 are axisymmetric with respect to the vertical line of the main signal transmission portion 15, so only the size of the first matching portion 13 is described, and the first matching portion 13 is The width first changed from 34mil to 18mil' and then to 12mil, with widths of 34mil, 18mU, and 12mil being i5mil, 17mil, and 17mil. The lengths of the first open transmission line 21 and the second open transmission line 22 are both 173 mils, and the width is (34 + 66) mi 1 » the length of the first and second open transmission lines 21, 22 and the length of the open portions 212, 222 It is 129mil. The first light transmission line 31 has a length of 151 mils and a width of 28 mils. The center of the first hole 31a is 20 mils from the second connecting portion 221. The length of the second coupling transmission line 32 is 151 mils, the width is 28 mils, the distance from the signal transmission line 10 is (36-28) mil, and the distance from the center of the second hole 32a to the near end of the second coupling transmission line 32 is l. 〇mil« Fig. 10 is a harmonic suppression effect diagram of an embodiment of a π-type filter (shown in Fig. 7) of the low-pass filter 10〇 of the present invention. In the present embodiment, the 7-inch type filter shown in FIG. 7 is applied to the WiMAX band of 3:·5 GHz, and the return loss (Return Loss) of the operating frequency (eg, 3.5 GHz) in the communication profile is below -10 dB. The insertion loss (Insertion Loss) of the second harmonic (such as 7.5 GHz) should be below -40 db, and the insertion loss of three times the frequency (such as 10. 5 GHz) should be below -20 db. In Fig. 10, S1 represents a reflection loss graph, and S2 represents an insertion loss graph. It can be clearly seen from S1 in Fig. 10 that the reflection loss Y is below -10 dB when the operating frequency χ = 3.5 GHz, indicating that the 3.5 GHz RF signal can be transmitted between the first 埠 11 and the second 埠 12; Working frequency 100104618 Form No. A0101 Page 11 / 28 pages 1002008039-0 201234706 X = 7.5-10.5GHz reflection loss γ is approximately equal to 〇 dB, indicating 7.5-10. 5GHz RF signal can not be in the first and the first Second. Pass between. [0033] [0034] It can be clearly seen from the S2 in the figure that when the operating frequency η., the insertion loss Y=-G. 44 ' does not inhibit the band near the GHz band of 3. 5 GHz. When the operating frequency X = 6.8 〇 _7.2 GHz, the insertion loss Y = -49. 69-55. 89 GHz, at this time, the insertion loss is all under .-, indicating that the double spectral wave between 6.80_7.2 GHz can be effectively suppressed. . When the operating frequency X = 1 0. 20-1 0. 80GHz, the insertion loss Y = -10. 72-4. 45GHz 'At this time, the insertion loss is above __ and it cannot effectively suppress H). 2Q_1Q. Triple spectral wave between Hz. In general, the π-type wave in Figure 7 can effectively suppress the double-frequency harmonics, but it cannot effectively suppress the triple-frequency harmonics. Figure 11 is a diagram showing the wave suppression effects of the low pass chopper (10) of the present invention (shown in Figure i). In the present embodiment, the low-pass filter 100 as shown in m is applied to the WiMAX band of 3.5 Ghz. In Figure 11, S3 represents the reflection loss curve, and S4 represents the insertion loss curve. It can be clearly seen from S3 in Fig. 11 that when the operating frequency χ=3.5 GHz, the reflection loss γ is at -1, indicating that the 3 5 GHz RF signal can be transmitted between the first 埠11 and the second 埠12; The operating frequency X=7. 5-10. The reflection loss γ at 5 GHz is approximately equal to 〇 dB, indicating that 7.5-10. 5 GHz RF signal cannot be transmitted between the first and the second bee. It can be seen from the month of S4 in Figure 11 that when the operating frequency χ = 3 6GHz, insert 100104618 form nickname A0101 page 12 / total 28 pages 1002008039-0 201234706 input loss Υ = -0. 3 7db, not It will suppress the frequency band around 3.5 GHz in the working frequency band; when the operating frequency χ = 80-7. 20 GHz, the insertion loss Y- 55. 94_59. 97 GHz, the insertion loss is below, indicating that the double frequency is effectively suppressed. harmonic. When the operating frequency Χ = 10· 20-1 0. 80GHz, the insertion loss Y = -33. 75-24. 98GHz, the insertion loss is below -20db', which effectively suppresses the triple harmonic. In general, the low-pass filter 1 in Fig. 1 not only effectively suppresses the double-frequency harmonics, but also effectively suppresses the triple-frequency harmonics. [0035] [0038] [0038] [0038] [0040] [0044] [0044] [0044] [0044] 100104618 In summary, the present invention is in line with the invention patent. File a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and those who are familiar with the skill of the present invention should be included in the following patent application gardens in accordance with the invention. .Inside. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view of an embodiment of a low pass chopper of the present invention. 2 is a schematic diagram of another embodiment of a low pass chopper of the present invention. 3 is a schematic diagram of still another embodiment of a low pass filter of the present invention. 4 is a schematic view of still another embodiment of the low pass waver of the present invention. Figure 5 is a schematic illustration of yet another embodiment of a low pass filter of the present invention. 6 is a schematic diagram of still another embodiment of a low pass filter of the present invention. Fig. 7 is a schematic view showing an embodiment of a 7-inch type filter of a low-pass filter of the present invention. Figure 8 is an equivalent circuit diagram of an embodiment of a low pass filter of the present invention. Figure 9 is a dimensional view of an embodiment of a low pass filter of the present invention. Form No. A0101 Page 13 of 28 1002008039-0 201234706 [0045] FIG. 10 is a harmonic suppression effect diagram of an embodiment of a ττ type filter of a low-pass filter of the present invention. 11 is a harmonic suppression effect diagram of an embodiment of a low-pass filter according to the present invention. [Main component symbol description] [0047] Low-pass filter: 100 [0048] Signal transmission line: 10 [0049] [0050] Second 埠: 12 [0051] First matching part: 13 [0052] Second matching part: 14 [0053] Main signal transmission part: 15 [0054] First side: 101 [0055] Second side :102 [0056] First open transmission line: [0057] First connection portion: 211 [0058] First open circuit portion: 212 [0059] Second open transmission line: [0060] Second connection portion: 221 [0061] Second Open circuit: 222 100104618 Form number Α 0101 Page 14 / Total 28 pages 1002008039-0 201234706 [0062] First coupled transmission line: 31 [0063] First hole: 31 a [0064] Second coupled transmission line: 32 [0065] Two holes: 32a [0066] T-shaped gap: 40 [0067] First gap: 41 [0068] Second gap: 42
100104618 表單編號A0101 第15頁/共28頁 1002008039-0100104618 Form No. A0101 Page 15 of 28 1002008039-0