201014029 九、發明說明： 【發明所屬之技術領域】 本發明是有關於一種雙頻帶通濾波器，特別是指一種 可以達到較佳緊密電路佈局的雙頻帶通濾波器。 【先前技術】 隨著無線通訊裝置的普及，雙頻射頻收發器（Dualband RF transceiver ) 在無線通訊領域所扮演 的角色就曰益 重要，而在雙頻射頻收發器的前端電路中，雙頻帶通濾波 器（Dual-band bandpass filter)更是不可或缺的元件之一。 最初，一雙頻帶通濾波器是以二個單頻帶通濾波器（ Single-band bandpass filter )利用平面電路的方式來實現， 這種方式往往導致該雙頻帶通濾波器的面積便得十分龐大 ，因此，若是想應用於以方便攜帶為基礎的無線移動通訊 裝置時，往往不能符合市場的需求，所以，步階式阻抗諧 振器（Stpped-impedance resonator, SIR)開始被使用於設計 一雙頻帶通濾波器，如：J.-T. Kuo和H.-S. Cheng於2004 年在 IEEE Microwave Wireless Component Letter 提出的「 Design of quasi-elliptic function filters with a dual-passband response」、Y.-H. Hsieh 等人於 2008 年在 Microwave and Optical Technology Letters 提出的「Design of spur-line-loaded cross-coupled dual-band bandpass filter with wide upper-end stopband」等文獻紛紛被提出，而這些文獻大多 利用半波長步階式阻抗諧振器或是四分之一波長步階式阻 抗諧振器來設計一雙頻帶通濾波器，然而這些相關的設計 201014029 仍存在著面積不夠小的問題’以γ_Η.臟的文獻為例， 其採用四分之-波長步階式阻抗諧振器來設計—雙頻 渡波器，該雙頻帶通渡波器的面積為i4Q 835mm2 (尺寸= 22.9mmx6.15mm)，因此’習知之設計仍有改善的空間。 【發明内容】 因此’本發明之目的，即在提供一種雙頻帶通據波 ，包含： ° -第-諳振器，其包括―第一線段、-第二線 一苐三線段； 一第二諧振器’其包括-第-線段、-第二線段，及 一第三線段； -第三諧振器，其包括一第—線段，及一第二線段； -第四諧振器’其包括一第—線段，及一第二線段； 其中’該第-、第二諧振器之第一線段平行間隔一段 距離’該第-、第二諧振器之第二線段分別由該第—、第 -諧振m線段的-端平行延伸，該第―、第二错振 器之第二線段分別由該第—、第二譜振器之第二線段的— 端平行延伸，然後轉九十度往彼此接近的方向延伸；該第 三二第四諧振器分別位於該第一、二諧振器之間，並且該 第二、第四諧振器之第一線段平行間隔一段距離並延伸， 該第三、第四諧振器之第二線段分別由該第三、第四諧振 器之第-線段的-端平行延伸，然後轉九十度往彼此遠離 的方向延伸，再分別轉九十度往接近該第三、第四諧振器 之第一線段的方向延伸。 201014029 由第一諸振器輸入的訊號經由以下二條不同路徑來傳 遞：~條路徑是經由該第一諧振器之第三線段與該第二节 振器之第三線段進行諧振，以將輸入訊號傳遞至該第二諧 振器作輸出，另一條路徑是部分第一諧振器與部分第三窄 振器進行諧振，然後，部分第三諧振器與部分第四諧振器 進行諧振，最後，部分第四諧振器與部分第二諧振器進行 諧振，以將輸入訊號傳遞至該第二諧振器作輸出。 ❿ 【實施方式】 有關本發明之前述及其他技術内容、特點與功效，在 以下配合參考圖式之一個較佳實施例的詳細說明中，將可 清楚的呈現。 參閱圖1與圖2，本發明雙頻帶通濾波器的一較佳實施 例是印刷在一單層印刷電路基板（圖未示）上之金屬導線 且包含一第一諧振器1、一第二諧振器2、一第三諸振器 3，與一第四譜振器4，且每一諧振器1〜4皆為四分之一波 ® 長步階式阻抗諧振器。 • 該第一、第二諧振器1、2分別包括一具有一第一寬度 W1之第一線段11、21，一具有一第二寬度w2之第二線段 12、22’ 一具有一第三寬度％之第三線段13、23，一具有 —第四寬度w4之第四線段14、24,及一具有該第三寬度 霄3之饋送線段15、25，此處該第一至第四寬度貿广霤4的 大小關係為第一寬度Wi最寬，並依序遞減至該第四寬度 W4最窄。 第一線段11、21分別具有一第一長度Ll與一第二長度 201014029 L2，且平打間隔一第-距離d“值得注意的是，本荦中所 指的距離都是指最接近的兩㈣邊之間㈣離）二 12、22分別由該第-線段11、21之-端平行延伸一；：長又 度L3與一第四長度L4。第三線段13、23分別由該第^線 段12、22之一端平行延伸—笛 第五長度[5，然後轉90度往 彼此接近的方向延伸—第六具择τ Τ弟^、長度L0之後，並距離一第二距 離‘該饋送線段15、25分別連接於該第二線段12、22 與該第三線段13、23連接之端部，並往彼此遠離且垂直於 第二線段i2、22的方向延伸—足夠供輸出輸人訊號的長度 :第四線段！4、24分別與第二線段12、22平行間隔一第 三距離山’並分別連接於饋送線段15、乃，同時，往靠近 第-線段11、21之方向分別延伸-第七長度及一第八長 度L8，且該第七長度L7及第八長度L8分別小於該第三及第 四長度LrL4’並使得第四線段14、24之一端與該第—線 段11、21距離該第三距離值得注意的是，該第一、第 二諧振器1、2之第一線段U、12上皆具有一接地點16、 26 ° 由於該第一、二諧振器1、2之第一至第四線段u〜14 、21〜24中具有三種不同特性阻抗之線段，因此，藉由適當 調整該等線段11〜14、21〜24之長度與寬度，可以使得該第 一、第二諧振器1、2在一第一頻率及一第二頻率&間產 生諧振》 該第三、第四諧振器3、4分別位於該第一、二諧振器 1、2之間，並包括一具有該第一寬度Wi之第一線段31、 201014029 41’及-具有該第三寬度W3之第二線段32、42。 該第三、第四諧振器3、4之第-線段31、41具有相 同的-第九長度“ ’且平行間隔—第四距離&，同時，嗜 第三、第四諧振器3'4之第一線段31、41分別與該第一 -為振器1、2之第二線段間隔—第五距離1。該第三、 第四^^振器3、4之第-綠玉凡，. 々罘一綠玟32、42分別由該第三、第四 諸振器3、4之第錄J5· 21 a 1 弟綠#又31、41的一端平行延伸一第十長201014029 IX. Description of the Invention: [Technical Field] The present invention relates to a dual band pass filter, and more particularly to a dual band pass filter which can achieve a better compact circuit layout. [Prior Art] With the popularity of wireless communication devices, the role of dual-band RF transceivers in wireless communication is very important. In the front-end circuits of dual-frequency RF transceivers, dual-band communication The Dual-band bandpass filter is one of the most indispensable components. Initially, a dual-band pass filter is implemented by using a single-band bandpass filter using a planar circuit. This approach often results in a very large area of the dual-band pass filter. Therefore, if it is intended to be applied to a wireless mobile communication device based on portability, it often fails to meet the market demand. Therefore, a Stpped-impedance resonator (SIR) is used to design a dual-band communication. Filters such as: J.-T. Kuo and H.-S. Cheng, "Design of quasi-elliptic function filters with a dual-passband response", Y.-H., IEEE Microwave Wireless Component Letter, 2004. Hsieh et al., "Design of spur-line-loaded cross-coupled dual-band bandpass filter with wide upper-end stopband", proposed by Microwave and Optical Technology Letters in 2008, have been proposed, and most of these documents use half-wavelength. A stepped impedance resonator or a quarter-wave stepped impedance resonator to design a dual bandpass filter, however Some related designs 201014029 still have the problem of insufficient area. 'Taking the γ_Η. dirty literature as an example, it uses a quarter-wavelength stepped impedance resonator to design—a dual-frequency waver, the dual-band wave-passing device The area is i4Q 835mm2 (size = 22.9mmx6.15mm), so there is still room for improvement in the design of the conventional. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a dual-band communication wave comprising: a -th-thickener comprising: a first line segment, a second line, a third line segment; The second resonator 'includes a -th line segment, a second line segment, and a third line segment; - a third resonator including a first line segment, and a second line segment; - a fourth resonator 'which includes a a first line segment, and a second line segment; wherein the first line segments of the first and second resonators are spaced apart by a distance, and the second line segments of the first and second resonators are respectively The ends of the resonant m-line segments extend in parallel, and the second line segments of the first and second dampers are respectively extended in parallel by the ends of the second line segments of the first and second spectral oscillators, and then turned to ninety degrees to each other The third and fourth resonators are respectively located between the first and second resonators, and the first line segments of the second and fourth resonators are spaced apart by a distance and extend, the third The second line segment of the fourth resonator is respectively from the first line segment of the third and fourth resonators - Extend in parallel, and then turn ninety degrees to the direction extending away from each other, respectively, then turn ninety degrees to close the third, first line segment extending in the direction of the fourth resonator. 201014029 The signal input by the first vibrators is transmitted through two different paths: the ~ path is resonating with the third line segment of the second resonator via the third line segment of the first resonator to input the signal Passing to the second resonator for output, the other path is that part of the first resonator resonates with part of the third narrow vibrator, and then part of the third resonator resonates with part of the fourth resonator, and finally, part of the fourth The resonator resonates with a portion of the second resonator to pass an input signal to the second resonator for output. The above and other technical contents, features, and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments. Referring to FIG. 1 and FIG. 2, a preferred embodiment of the dual band pass filter of the present invention is a metal wire printed on a single layer printed circuit board (not shown) and including a first resonator 1 and a second The resonator 2, the third vibrator 3, and the fourth vibrator 4, and each of the resonators 1 to 4 are quarter wave® long step impedance resonators. The first and second resonators 1, 2 respectively comprise a first line segment 11, 21 having a first width W1, a second line segment 12, 22' having a second width w2, having a third a third line segment 13 , 23 of width %, a fourth line segment 14 , 24 having a fourth width w4, and a feed line segment 15 , 25 having the third width 霄 3 , where the first to fourth widths The size relationship of the trade gap 4 is that the first width Wi is the widest and is sequentially decreased to the fourth width W4 to be the narrowest. The first line segments 11 and 21 respectively have a first length L1 and a second length 201014029 L2, and the flattening interval is a first-distance d. “It is worth noting that the distances referred to in this section refer to the two closest ones. (4) The edges (4) are separated from each other. The two ends 12 and 22 respectively extend in parallel from the end of the first line segment 11 and 21; the length L3 and the fourth length L4. The third line segments 13 and 23 are respectively One end of the line segments 12, 22 extends in parallel - the fifth length of the flute [5, then 90 degrees to extend in the direction close to each other - the sixth choice τ Τ brother ^, after the length L0, and a distance from the second distance 'the feed line segment 15 and 25 are respectively connected to the ends of the second line segments 12, 22 and the third line segments 13, 23, and extend away from each other and perpendicular to the second line segments i2, 22 - sufficient for outputting the input signal Length: the fourth line segment! 4, 24 are respectively spaced apart from the second line segments 12, 22 by a third distance mountain 'and are respectively connected to the feeding line segment 15, and at the same time, respectively extending in the direction close to the first line segment 11, 21 - a seventh length and an eighth length L8, and the seventh length L7 and the eighth length L8 are respectively smaller than the The third and fourth lengths LrL4' and the distance between one end of the fourth line segment 14, 24 and the first line segment 11, 21 are notable, the first line of the first and second resonators 1, 2 Each of the segments U and 12 has a grounding point of 16, 26 °. Since the first to second segments of the first and second resonators 1 and 2 have segments of three different characteristic impedances, By appropriately adjusting the length and width of the line segments 11 to 14, 21 to 24, the first and second resonators 1, 2 can be caused to resonate between a first frequency and a second frequency & 3. The fourth resonators 3, 4 are respectively located between the first and second resonators 1, 2, and include a first line segment 31 having the first width Wi, 201014029 41' and - having the third width a second line segment 32, 42 of W3. The first line segments 31, 41 of the third and fourth resonators 3, 4 have the same - ninth length "' and parallel spacing - fourth distance & 3. The first line segments 31, 41 of the fourth resonator 3'4 are spaced apart from the second line segments of the first - vibrators 1, 2, respectively - a fifth distance 1. The third and fourth vibrators 3, 4 of the first - green jade, the first green dwarf 32, 42 by the third and fourth vibrators 3, 4 of the first record J5 · 21 a 1 Di Green #31,41 one end of the parallel extension of a tenth long
❷ 度L10,然後轉90度往彼此遠離的方向延伸一第十一長度 L"，再分㈣9〇餘接近該第三、第四賴^ 3、4之^ -線段3卜41的方向延伸一第十二長度卜”其中，該第 ，、第四諸振器3、4之第二線段MW與該第一、第二 讀振器1、2最接近處距離_第六距離&。值得注意的是， 該第三、第四諧振器3、4之第一線段η、"上皆具有一 接地點33、43。 四諧振器 由於該第三、四諧振器3、4之第一至第二線段m 41〜42中具有二種不同特性阻抗之線段，因此，藉由適當 調整該等線段31〜32、41〜42之長度與寬度，可以使得該第 4在一第一頻率fi及一第二頻率&間產生 一 X ΓΤΓ» ter r»r> _ 諧振 33在本實施例中，該第三、第四諧振器3、4上的接地點 43疋利用一鉚釘接地的方式，以達到電場隔離的效 $換句話說，該第三、第四諧振器3、4對於第―、第二 * 2所產生之父錯叙合效應，可以被隔離，因此， °、有效降低交錯麵合效應的設計複雜度。 201014029 因此，聯合參閱圖1、2,由第一諧振器i之饋送線段 15輸入的訊號可以經由以下二條不同路徑來傳遞：一條路 徑是經由該第一諧振器1之第三線段13與該第二諧振器2 之第三線段23進行諧振，以將輸入訊號傳遞至該第二諧振 器2上，並經由該第二譜振器2之饋送線段25輸出；另一 條路徑是該第-諧振器i之第—、第二線段u、12及部分 第三線段13 (與該第一諧振器！之第—線段n平行的部分 )與該第三諧振器3之第一線段31與部分第二線段32 (鄰 近該第-諧振器1之第_、第二線段u、12的部分）進行 諧振，以將訊號傳遞至該第三諧振器3上，然後，該第三 諧振器3之第-線段31及部分第二線段32 (鄰近該第四借 振器4的部分）與該第四諧振器4之第-線段41及部分第 二線段鄰近該第三_器3的部分）進行諧振， 訊號傳遞至該第四諧振器 白搌益4上，最後，該第四諧振器4之 -線& 41與部分第二線段42 (鄰近該第二諧振器2之 ❹ 一、第二線段21、22的部分）與該第二諧振器2之第一、 ΠΓ1、、22及部分第三線段23(與該第二諧振器2之 該第I:/:的部分)進行諧振，以將輸入訊號傳遞至 輸匕落振…’並經由該第二諸振器2之饋送線段Μ 及入圖3 ’本實施例在特定尺寸下量測到的返回損失S 及入射損失s2波形圖。誃耸心扭η ^ Sl 的數據如下表i所示："等諧振151〜4之線段長度及寬度 10 201014029❷ degree L10, then turn 90 degrees to extend away from each other in an eleventh length L", and then divide (four) 9 接近 to extend the direction of the third, fourth lai ^ 3, 4 ^ - line segment 3 卜 41 The twelfth length, wherein the second line segment MW of the fourth and fourth vibrators 3, 4 is closest to the first and second vibrators 1, 2, the sixth distance & Note that the first line segments η, " of the third and fourth resonators 3, 4 each have a ground point 33, 43. The fourth resonator is the third and fourth resonators 3, 4 A line segment having two different characteristic impedances in the first to second line segments m 41 to 42. Therefore, by appropriately adjusting the length and width of the line segments 31 to 32, 41 to 42 , the fourth frequency can be made at a first frequency. Fi and a second frequency & generate an X ΓΤΓ» ter r»r> _ resonance 33. In this embodiment, the ground point 43 上 on the third and fourth resonators 3, 4 is grounded by a rivet In order to achieve the effect of electric field isolation, in other words, the third and fourth resonators 3, 4 have the effect of the parental error of the first and second * 2, To be isolated, therefore, to effectively reduce the design complexity of the interlaced surface effect. 201014029 Therefore, referring collectively to Figures 1, 2, the signal input by the feed line segment 15 of the first resonator i can be transmitted via the following two different paths. : a path resonates with the third line segment 13 of the second resonator 2 via the third line segment 13 of the first resonator 1 to transmit an input signal to the second resonator 2, and via the second The feed line segment 25 of the spectrometer 2 is output; the other path is the first, second line segment u, 12 and part of the third line segment 13 of the first-resonator i (parallel to the first line segment n of the first resonator! Resonating with the first line segment 31 of the third resonator 3 and a portion of the second line segment 32 (the portion adjacent to the _th and second line segments u, 12 of the first-resonator 1) to transmit the signal Up to the third resonator 3, then, the first line segment 31 of the third resonator 3 and a portion of the second line segment 32 (portion adjacent to the fourth vibrator 4) and the first portion of the fourth resonator 4 The line segment 41 and a portion of the second line segment adjacent to the third _ _ 3 are resonating, Passed to the fourth resonator, Bai Yiyi 4, and finally, the line & 41 of the fourth resonator 4 and a portion of the second line segment 42 (near the first, second line 21, 22 of the second resonator 2) Partly) resonating with the first, first, and second portions of the second resonator 2 and a portion of the third line segment 23 (the portion of the first:/: of the second resonator 2) to transmit the input signal to The output of the second vibrator 2 is fed through the feed line segment of the second vibrator 2 and into the waveform of the return loss S and the incident loss s2 measured at a specific size in the present embodiment. The data of the η ^ Sl ^ Sl is shown in the following table i: "The length and width of the line segment of the resonance 151~4 10 201014029
第一長度L t 第二長度L: 第三長度L: 第四長度L4 第五長度l5 第六長度1^6 第七長度l7 第八長度l8 第九長度L9 第十長度l1q 第--長度Lh 2.89mm 3.30mm 3.26mm 2.85mm 3.64mm 3.14mm 3.06mm 2.65mm 6.15mm 2.60mm 2.32mmFirst length L t Second length L: Third length L: Fourth length L4 Fifth length l5 Sixth length 1^6 Seventh length l7 Eighth length l8 Ninth length L9 Tenth length l1q First-length Lh 2.89mm 3.30mm 3.26mm 2.85mm 3.64mm 3.14mm 3.06mm 2.65mm 6.15mm 2.60mm 2.32mm
第一寬度W2 1三寬度W3 第一距離φ 第三距離di ----~_： 第五距離d ----~~-— ^六距離d6 J^.80mm 〇.54mm 〇.20mm 5.30mm 0.1 Omm 〇.20mm 〇.20mm 〇.35mmFirst width W2 1 three width W3 first distance φ third distance di ----~_: fifth distance d ----~~--^ six distance d6 J^.80mm 〇.54mm 〇.20mm 5.30 Mm 0.1 Omm 〇.20mm 〇.20mm 〇.35mm
第十二長度L; 2.30mmTwelfth length L; 2.30mm
由圖3顯示的波形圖所示，可以觀察到本發明交織耦 合佈局之雙㈣通纽器於2.45版、55册之頻寬比分 別為15。/。與9.9%，其插入損失分別為i鹰與i低此外 ’藉由第一、第二諧振器卜2之第四線段14、24的設計 可以植入可控制的傳輸零點（Zer〇 ) ’以壓抑雙通帶以外 的止帶區所可能出現的諧振偽模，以增加止帶的頻寬，以 本實施例而言可以增加到5.12GIiz。 最重要的是’本發明之雙頻帶通濾波器的面積為 100.201mm2 (尺寸為1〇 33nimx9 7mni)，相較於習知之相似 的雙頻帶通滤波器而言’面積可以大幅縮減，以γ._Η. Heieh的文獻為例，本實施例可以縮減雙頻帶通濾波器的面 11 201014029 積達29%，同味，處 呼對應之頻率響應結果亦不受面積縮減的 影響而大幅衰竑，, 战因此’本發明可以做到較佳緊密排列的 雷路佑品。 4上所述，本發明確實可以有效達到縮小雙頻帶通減 波器的面積，並不影響頻率響應的結果，故確實能達成: 發明之目的。 准以上所述者，僅為本發明之較佳實施例而已，告不 能以此㈣本發明實施之範圍，即大凡依本發明中請:利 乾圍及發明說明内容所作之簡單的等效變化與修飾，皆仍 屬本發明專利涵蓋之範圍内。 【圖式簡單說明】 圖1是本發明之雙頻帶通濾波器之結構圖； 圖2是本發明之訊號傳遞路徑示意圖；及 圖3是量測本實施例之頻率響應之波形圖。As shown in the waveform diagram shown in Fig. 3, it can be observed that the double (four) connector of the interleaved coupling layout of the present invention has a bandwidth ratio of 15 in the 2.45 version and 55 volumes, respectively. /. With 9.9%, the insertion loss is lower for i eagle and i respectively. 'With the design of the fourth line segment 14, 24 of the first and second resonators 2, a controllable transmission zero point (Zer〇) can be implanted. The resonant dummy mode that may occur in the stop band outside the double pass band is suppressed to increase the bandwidth of the stop band, which in this embodiment can be increased to 5.12 GIiz. The most important thing is that the area of the dual-band pass filter of the present invention is 100.201 mm2 (the size is 1〇33nimx9 7mni), and the area can be greatly reduced to γ compared to the conventional dual-band pass filter. _Η. Heieh's literature as an example, this embodiment can reduce the surface of the dual-band pass filter 11 201014029 to 29%, the same taste, the corresponding frequency response results are not affected by the area reduction and greatly reduced, Therefore, the invention can achieve a better and closely arranged Leo Road. As described above, the present invention can effectively achieve the reduction of the area of the dual-band pass-attenuator without affecting the result of the frequency response, so that it can be achieved: the object of the invention. The above is only the preferred embodiment of the present invention, and it is not possible to use the scope of the present invention in the scope of the present invention, that is, in the present invention, the simple equivalent change made by the Legan Wai and the description of the invention. And modifications are still within the scope of the invention patent. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a structural diagram of a dual band pass filter of the present invention; Fig. 2 is a schematic diagram of a signal transmission path of the present invention; and Fig. 3 is a waveform chart for measuring the frequency response of the embodiment.
12 201014029 【主要元件符號說明】 1 …·…‘第一諧振器 2 4 If * » ♦ * ♦ * •-第四線段 11 · ......…第一線段 2 5 *.....* ••饋送線段 12- ……··第二線段 2 6 *，* μ μ -·接地點 13- ……，第三線段 ••第三諳振器 14· ……，.第四線段 3 1 » » 5· » » » » ••第一線段 15· ……··饋送線段 3 2 - * - * …- •-第二線段 16. .......接地點 Κ * * » 0 * « ' Μ接地點 2 *r •-……第二諧振器 •第四諧振器 21- • •……第一線段 1 « » * fc ♦ « * ••第一線段 22* ........第二線段 β 2 » » y » f ♦，. •第二線段 23· •……第三線段 S( * K 4· 3； « K •，接地點12 201014029 [Description of main component symbols] 1 ...·...'First resonator 2 4 If * » ♦ * ♦ * • - Fourth line segment 11 ... ......... First line segment 2 5 *... ..* ••Feed line segment 12-...··Second line segment 2 6 *,* μ μ -·Ground point 13- ..., third line segment •• Third damper 14· ......,.Fourth Line segment 3 1 » » 5· » » » » • • First line segment 15·...··Feed line segment 3 2 - * - * ...- •-Second line segment 16. ....... Grounding pointΚ * * » 0 * « ' Μ Grounding point 2 *r • -... Second resonator • Fourth resonator 21- • •...... First line segment 1 « » * fc ♦ « * •• First line segment 22* ........Second line segment β 2 » » y » f ♦,. • Second line segment 23· •...... Third line segment S (* K 4· 3; « K •, grounding point
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