TWI246251B - Narrow band pass filter for laying out on circuit board to suppress high frequency harmonics - Google Patents

Abstract

A narrow band-pass filter for laying out on circuit board to suppress high frequency harmonics is provided. During the manufacturing of the printed circuit board for a wireless communication product, a microstrip circuit corresponding to a narrow band-pass filter is formed on one side of the circuit board in the way of metal microstrip. The microstrip circuit includes a microstrip line with a larger capacitance, and is laid out on the circuit board with the inter-digital finger technique to reduce the occupation area. By utilizing the limited space unused on the circuit board, the layout of the narrow band-pass filter can effectively suppress the high frequency harmonics. This design can reduce the manufacturing cost and the product size as well as improve the performance by filtering the undesirable frequencies.

Description

12462511246251

五、發明說明（1) 【發明所屬之技術領域】 本發明係關於_插少n庄，_ 利用Φ1 種抑制谐波雜訊之濾波器，尤指一種 rn η ^ a ^ ^ 衣作技術，直接將微帶線佈設在一無線 波哭路板上，形成一低成本高效能之窄頻帶通濾 用窄頻技術’抑制掉不需要之頻率，僅令所需 :t丨運用諸波抑止的技術，有效避免該無線通 讯產印之接收端遭受不必要之頻率干擾。 【先前技術】 ^年來，由於無線通訊產品之市場需求大增，使得無 域網路（WLAN)之發展更為快速，尤其是在1 997年間 制疋出IEEE 802. 1 1無線區域網路協定後，不僅提供了益 線區域網路通訊上許多前所未有之功能，還提供了可令’各 種不同廠牌之無線產品得以相互溝通之解決方案，為無線 區域網路之發展開啟了另一個新的里程碑，該協定並確定 了以核〜裝置執行單晶片之解決方案，大幅降低了採用無 線技術所需之成本，使得無線區域網路得以被廣泛地應用、 於各種無線通訊產品中。 ^ 〜 丨 β亥專無線通產品在局功率狀態下，進行資料之無線 傳輸時，一般均會因主動元件之非線性特性，產生高頻譜 波雜訊’造成電磁波干擾（EMI) ’故各先進國家為解1 夬^匕°& 一問題，乃依續制定了相關法規，對不符規定之蛊線通訊 產品之輪入及使用，加以限制。有鑒於此’無線通訊產品 之設計及製造廠商，在有限空間内進行電路佈局與設計V. Description of the invention (1) [Technical field to which the invention belongs] The present invention relates to _insert small n, _1 filter using Φ1 to suppress harmonic noise, especially a rn η ^ a ^ ^ clothing technology, The microstrip line is directly arranged on a wireless wave circuit board to form a low-cost and high-efficiency narrow-band pass filter. The narrow-band technology 'suppresses unwanted frequencies and only makes it necessary: t 丨 using various wave suppression Technology to effectively prevent the receiving end of the wireless communication print from receiving unnecessary frequency interference. [Previous technology] In the past ^ years, the market demand for wireless communication products has greatly increased, making the development of WLANs more rapid, especially the IEEE 802.1 1 wireless local area network protocol was produced in 1997 After that, it not only provided many unprecedented functions in Yixian LAN communication, but also provided a solution that can communicate with various wireless products of different brands, opening up another new one for the development of wireless LANs. A milestone, the agreement also identified a single-chip solution using a core-to-device implementation, which significantly reduced the cost required to adopt wireless technology, enabling wireless local area networks to be widely used in various wireless communication products. ^ ~ 丨 β Under the condition of local power, when wireless transmission of data is carried out, high-frequency wave noise is generally generated due to the non-linear characteristics of active components, which causes electromagnetic interference (EMI). In order to solve the problem, the state has successively formulated relevant laws and regulations to restrict the rotation and use of non-compliant wireless communication products. In view of this, the design and manufacture of wireless communication products, circuit layout and design in a limited space

1246251 五、發明說明（2) 時，均會在其功率放 產生之高頻諧波雜訊 合各國相關法規之要 專無線通訊產品之控 係用以抑制該等無線 高頻濾波器不僅價袼 朝輕薄短小且價廉物 a ’增设該種向頻據 體積，顯然並不適宜 | 此外，由於在對 試時，高功率發射訊 過測試之部份，其中 高倍頻之諧波，最難 製作成本及體積之前 無線通產品，即成^ 決之一重要課題。 大器之後，增設一遽波器，以抑制所 期所製作出之無線通訊產品，能符 求。然而，各該薇商在設計及製造該 制線路時，所使用之濾波器，一般僅 通訊產品所產生之二倍頻諧波，該種 昂貝，且其體積相對龐大，故對目前 美之設計趨勢發展之無線通訊產品而 波器，將大幅增加產品之製作成本及 °亥#無線通訊產品進行電磁波干擾測 號所產生之諧波，往往是最不容易通 尤以發射訊號主頻之二倍頻譜波及更 f到標準，故如何在不大幅增加產品 提下’能設計製作出符合相關法規之 為各該設計及製造廠商亟待克服與解 【發明内容】 丨有釔於則述，设計製造傳統無線通訊產品時，為抑制 戶1產生之一 t頻諧波，戶斤需付出之代價及所產生之缺失， t明人：11康多年來從事無線通訊產品之技術經驗，及所 累積，專業知識H述缺失，開發設計出本發明之〆 種佈：t ?路板上用以抑制高頻諧波之窄頻帶通濾波器。 ^ 目的’係利用印刷電路板之製作技術，在 1246251 五、發明說明（3) 產品之電路板時，以金屬微帶方式，將- 思；^所對應之微帶線路，直接製作在該電路板 運：：該微帶線路所包含電容值較大之-電容 係運用指間相連（interdigitai finger)之方 :二a又在°亥電路板上’以避免該電容微帶線佔用該電路 人吁：t之面ΐ，有效增加該電路板上之可利用空間，並 2该無線通訊產品在無需使用額外高頻濾波器之狀況下， τ效抑制該無線通訊產品之功率放大器因非線性失 生之二倍頻及更高倍頻之諧波雜訊（Harmonic 八 馨PpuHous)，大幅降低該無線通訊產品之 效降低所產生之電磁波干擾。 风I 且有 本發明之另一目的，係該微帶線路所包含 之其它電容微帶線，係利用佈線中互相麵合之部分值= Ϊ Ϊ二來，以避免該等電容微帶線佔用該電路板上之可利 丰發 · 丨小你成▼遇應波器呈指間相遠 (mterdigital finger)狀佈設在該電路板上，复一連 作為該帶通滤波器之一輪入端，其另一對應端則、/盘、一係 蜿蜒狀（mender line)(如：rs」形或倒Γυ」形呈 電感微帶線直交相連，該第一電感微帶線之一 一 婉蜒狀（mender line)(如：「s」形或倒Γυ」开/、人一呈 電感微帶線之一端直交相連，其另一端則係與第二 微帶線之一端呈直交相連，其中該第三電感 二電感 第一電感微帶線相連接之一端係作為該帶^濾=二上與該 〜叹裔之一輪1246251 V. Description of the invention (2), the high-frequency harmonic noise generated by its power amplifier will be in accordance with the relevant laws and regulations of various countries. The control system of special wireless communication products is used to suppress these wireless high-frequency filters. It is obviously not suitable to increase the volume of this kind of data, which is thin, short, and inexpensive. In addition, during the test, high-power harmonics are the most difficult to produce. Prior to cost and volume, wireless communication products have become an important issue. After the amplifier is installed, an additional wave filter is added to suppress the desired wireless communication products. However, the filters used by each Weishang company in the design and manufacture of the line are generally only the double-frequency harmonics generated by communication products. This kind of amber is relatively bulky. The design of wireless communication products that develop trends and wave devices will greatly increase the production cost of products and the harmonics generated by electromagnetic interference measurement of wireless communication products. It is often the most difficult to communicate, especially the main frequency of the transmitted signal. The frequency doubling spectrum is more standard, so how can we design and manufacture products that meet relevant regulations without significantly increasing the product? Each design and manufacturer needs to be overcome and solved. [Content of the invention] 丨 Yttrium is described in detail, design When manufacturing traditional wireless communication products, in order to suppress the t-frequency harmonics generated by household 1, the cost and losses that households must pay, t Mingren: 11 Kang ’s technical experience in wireless communications products over the years, and the accumulated experience Due to the lack of professional knowledge, a cloth of the present invention is developed and designed: a narrow-band pass filter for suppressing high-frequency harmonics on a circuit board. ^ Purpose 'is the use of printed circuit board manufacturing technology. In 1246251 V. Invention description (3) When the circuit board of the product, the metal microstrip method will be used to think-^ The corresponding microstrip line is directly produced in the circuit Board transport :: The microstrip line contains a larger capacitance value-the capacitor is connected by interdigitai fingers: two a on the circuit board, to prevent the capacitor microstrip line from occupying the circuit person Call: The face of t effectively increases the available space on the circuit board, and 2 the wireless communication product suppresses the power amplifier of the wireless communication product due to non-linear loss without using an additional high-frequency filter. Harmonic Noise Harmonic Noise (Harmonic Eight PpuHous), which greatly reduces the effectiveness of this wireless communication product and reduces the electromagnetic wave interference. Wind I also has another object of the present invention, which is other capacitor microstrip lines included in the microstrip line, using the value of the part of the wiring that meets each other = Ϊ 来 to avoid the occupation of these capacitor microstrip lines. Kellett & Co., Ltd. on this circuit board 丨 Xiaoyoucheng ▼ The wave-responder is arranged on the circuit board in the form of mterdigital finger, which is used as one of the round-in ends of the bandpass filter. The other corresponding end, / disk, a series of meander lines (such as: rs "or inverted Γυ" shape is connected directly to the inductive microstrip line, one of the first inductive microstrip line is a gentle serpentine (Mender line) (such as: "s" shape or inverted Γυ "open /, one end of the inductive microstrip line is directly connected to one end, and the other end is connected to one end of the second microstrip line in a direct line, where the first One end of three inductors, two inductors, and the first inductive microstrip line are connected to the belt.

1246251____— 五、發明説明（4) 出端，該第二電感微帶線及第三電感微帶線之另一端則分 別透過該電路板上之一貫穿孔，與該電路板之另一側面所 佈設之一接地面相連接，如此，即可利用該電路板上未使 用之空間，佈設出可有效抑制高頻諧波雜訊之窄頻帶通濾 波器，不僅大幅減少了製作成本及產品體積，更可運用窄 頻技術，有效抑制掉不需要之頻率，僅令所需之頻帶通 過，有效避免了該無線通訊產品之接收端遭受不必要之頻 率干擾。 為便貴審查委員能對本發明之形狀、構造、設計原 _理及其功效，有更進一步之認識與瞭解，茲列舉若干實施 例，並配合圖式，詳細說明如下： 【實施方式 按，在 元件，本發 構在無線通 購置濾波器 未使用之空 制掉鄰近不 52GHz之益 i\w 由微帶線組 間’故如何 要求’其電 查，傳 無線通 明係利 訊產品 之成本 間，運 需要之 線通訊 成之帶 製作出 路板空 統上， 之主要 直接建 省額外 上閒置 ，並抑 主頻為 建構一 大之空 之設計 技術。 微帶線 Λ產品中’渡波器乃一不可或缺 用微帶線技術，將所需之濾波器 之電路板上，如此，一方ΐ可節 ，另一方面尚可充分利用電路板 用窄頻技術，令所需之頻帶通過 頻率。然而，由於在—發射訊號 產品（如·無線區域網路產品）上 通濾波器，將佔據電路板上非常 -無線通訊產品’符合輕薄短小 間之利用，即一極Λ舌 馬重要之關鍵 在'、，、線通訊產品之電路板上，以1246251 ____— 5. Description of the invention (4) At the output end, the other ends of the second and third inductive microstrip lines pass through a through hole on the circuit board and are laid on the other side of the circuit board. One ground plane is connected. In this way, the unused space on the circuit board can be used to deploy a narrow-band pass filter that can effectively suppress high-frequency harmonic noise, which not only greatly reduces the production cost and product volume, but also The use of narrow-band technology effectively suppresses unwanted frequencies and allows only the required frequency bands to pass, effectively preventing the receiving end of the wireless communication product from receiving unnecessary frequency interference. In order that the review committee can further understand and understand the shape, structure, design principles and effects of the present invention, a few examples are listed together with the drawings to explain in detail as follows: Components, the wireless system purchases the unused filters of the wireless communication system to eliminate the benefits of the adjacent 52GHz i \ w from the microstrip line group 'so how to request' its electrical inspection, it is reported that the wireless communication system is a cost of Lexon products. The belts produced by the communication lines required for the production of circuit boards are mainly designed directly to save extra space, and to suppress the main frequency as a design technology to construct a large space. The microstrip line Λ product is an indispensable use of microstrip line technology, the required filter circuit board, so that one side can save, on the other hand can make full use of the narrow frequency band of the circuit board Technology to pass the required frequency band. However, since the pass-through filter on products that transmit signals (such as wireless LAN products) will occupy the circuit board, very-wireless communication products are in line with the use of thin, light and short rooms, that is, the key to the importance of a pole ',,, line communication products on the circuit board, with

第8頁 1246251 般均極為龐大，且運用在無 五、發明說明（5) 技術所製作之帶通濾波器，一般：巧供巧，服八，且％川# 3 線區域網路上操作頻率在5 GHz之帶通濾波器，大多係屬 寬頻架構，如：5· 1 GHz〜5. 8 GHz之頻帶範圍。因此，為 令無線通訊產品能符合日本無線通訊網路之5· 15 GHz〜 5· 25 GHz窄頻帶要求，發明人乃設計出一種佈設在電路板 上用以抑制高頻諧波之窄頻帶通濾波器，該窄頻帶通濾波 器係利用印刷電路板之製作技術，在製作一無線通訊產品 之電路板時，直接佈設在該電路板之一側面上未使用之閒 置空間’以令該無線通訊產品在無需使用額外高頻濾波器 ，可有效抑制該無線通訊產品之功率放大二ί Λ !·生失真所產生之二倍頻及更高倍頻之諧波雜吒 (Ha^nonic Smiri〇us)，大幅降低該無線通訊產品之 ’且有效降低所產生之電磁波干擾。 ° 發明之一較佳實施例中，參閱第 =通處波器10之-等效電路圖，其輸入固所不，乃该 Π端相連接’該第—電係與-弟一電 ⑥之能量，其另—端係分別與一第 ？仏電路增振所 =7第，電感l2之-端相連接，其—中該心電感 -巾制一倍頻諧波之頻率， “奋C2係用以 •提升抑制二倍頻譜波之頻率，二電容c2之值可 f ^通據波器1 〇之輸出端丨2相‘兮之另一端係與 提供電路譜振所需之能量，提J ?亥第-電感Li係用以 降低該第一電减L夕播|你胜一"頻諧波之頻率，/5夕 aLl之值可使帶通頻帶之頻寶描/反之， ____ 頻見乓加，提升抑Page 81246251 is generally very large, and is used in bandpass filters made by the fifth, invention description (5) technology, generally: Qiaosuqiaoqiao, serving eight, and the operating frequency of the% Chuan # 3 line local network 5 GHz band-pass filters are mostly broadband architectures, such as: 5.1 GHz to 5. 8 GHz. Therefore, in order to make the wireless communication products meet the requirements of the Japanese wireless communication network's narrow band of 5.15 GHz to 5.25 GHz, the inventor has designed a narrow-band pass filter that is arranged on the circuit board to suppress high-frequency harmonics. Device, the narrow-band pass filter uses printed circuit board manufacturing technology. When making a circuit board for a wireless communication product, it is directly arranged in the unused free space on one side of the circuit board to make the wireless communication product. Without the use of additional high-frequency filters, this wireless communication product can effectively suppress the power amplification of the wireless communication products. Harmonic noise (Ha ^ nonic Smiri〇us) of the second and higher frequency generated by distortion, Significantly reduce the wireless communication products and effectively reduce the electromagnetic wave interference. ° In a preferred embodiment of the invention, refer to the equivalent circuit diagram of the wave pass device 10, the input of which is fixed, but the Π terminal is connected to the energy of the first electric system and the first electric power ⑥ , Its other-the end system and the first?仏 The circuit vibration boosting station = 7th, the-terminal of the inductor l2 is connected, in which the core inductor-the frequency of the double-frequency harmonic, "Fen C2 is used to • increase the frequency of suppressing the double-spectrum wave, The value of the two capacitors c2 can be f ^ pass through the output terminal of the wave filter 10 and the other end of the two phases is the energy required to provide the circuit's spectral vibration. A power reduction L Xi broadcast | You win a frequency of the frequency harmonic, the value of / 5 Xi aLl can make the frequency of the bandpass frequency band described / converse, ____ frequency increase, increase the suppression

帶通頻帶之頻寬，以降低抑ί:;;::電感^之值可減少 降低該第一雪成· τ __ σ ^員谐波之頻率，反之， 1246251The bandwidth of the band-pass band to reduce the suppression of the value of: ;; :: inductance ^ can reduce the frequency of the first snow formation · τ _ σ ^ member harmonics, otherwise, 1246251

五、發明說明（6) 制二倍頻諧波之頻率，該第一電感l之另一 端，該第二電感L係用播供雷^丨 ，、連至接地 兮筮—φ a τ 2用以挺供電路諧振所需之能量，描古 该弟一電感L2之值可增加帶通頻帶之頻提同 頻諧波之頻率，反之 ^ ^ ^ &升抑制二倍 相姓止々 之’降低该第二電感L2之值可減Φ鹛、g 接，增加該第i電容C ^二士第一電备C3之一端相連 譜波之頻率，反可笛同時降低帶通頻帶與二倍頻 減y δ亥第二電容c之值可同车接 通頻帶與二倍頻諧波之嘀I，$铪丄值J冋日守槌升贡 >該帶通濾波器1 〇之輸出沪·! 9 i日蝻拉 ★认3 而係與 一 + * τ 别出食而1 2相連接，該輪出端1 2並與一第 二電感l3之-端相連接，提升該第三電執之值，可使 =帶之頻寬增加’反之’減少該第三 使帶通頻帶之頻寬減少，達到窄頻之效果。該較佳實^系 根據該等政電路所提供之線路，利用微帶線製作技術， 製作一無線通汛產品之電路板時，直接將該等效電路對鹿 之微帶線路，佈設在該電路板之一側面，製作出本發明= 稱之窄頻帶通濾波器。 在該較佳貫施例中，以一介電常數為4 · 3、厚度為 11.4米爾（mils)及損耗正切（L〇ss Tangent)為〇〇245之介 暑電質基板（即電路板之基材）為例，參閱第2圖所示，若在 其上1 3 4 X 11 4平方米爾（m丨I2)大小之空間上，設計本發 明之窄頻帶通濾波器’因該第一電容C〗之電容值較為龐 大’該貫施例乃運用才曰間相連（interdigital finger)狀 之佈線技術（Layout) ’將該第一電容(:丨所對應之微帶線V. Description of the invention (6) The frequency of the double-frequency harmonic is made. At the other end of the first inductor l, the second inductor L is used for broadcasting, and it is connected to the ground. Φ a τ 2 In order to support the energy required for circuit resonance, describing the value of the inductor L2 of the brother can increase the frequency of the band-pass frequency and the frequency of the same frequency harmonic, otherwise ^ ^ ^ & rise to suppress double the phase name only Decreasing the value of the second inductance L2 can reduce Φ 鹛, g, and increase the frequency of the spectral wave connected to one end of the i-th capacitor C ^ 2, the first electrical backup C3, which can reduce the bandpass frequency and the double frequency at the same time. The value of the second capacitor c minus y δ can be connected to the frequency band I and the double-frequency harmonic 谐波 I, $ 铪 丄 value J 冋 日 守 锤 守 tribute > the output of the bandpass filter 10 ! 9 i 日 蝻 拉 ★ Recognize 3 and connect it to a + * τ Do n’t feed and connect 1 2. The output end 12 of the wheel is connected to the-end of a second inductor l3 to enhance the third electric actuator. The value can make the bandwidth of the band increase, and vice versa, reduce the bandwidth of the third pass band, and achieve the effect of narrow frequency. The better practice is to use the microstrip line production technology to make a circuit board for a wireless flood product based on the circuits provided by these political circuits. One side of the circuit board is fabricated with a narrow band-pass filter according to the present invention. In this preferred embodiment, a dielectric substrate (that is, a circuit board) having a dielectric constant of 4 · 3, a thickness of 11.4 mils, and a loss tangent of 〇245 is used. (Base material) as an example, referring to FIG. 2, if the space of 1 3 4 X 11 4 square meters (m 丨 I2) size is designed, the narrow band pass filter of the present invention is The capacitance value of C is relatively large. 'This embodiment uses the interdigital finger-like wiring technology (Layout)' to connect the first capacitor (: 丨 to the microstrip line).

第10頁 1246251Page 10 1246251

路，佈設在該空間内，以降低直戶斤 ，低，、所佔用之面積，解決佈設 面積不足之問通，至於，該第二電容q及第三電容 容值較小之部分，則運用佈線中互相耦合之部分將其製作 出來。 八、 在該較佳實施例中，參閱第2及3圖所示，該帶通濾波 器2 0所對應之微帶線路，包括一第一電容微帶線該 一電容微帶線MC1係呈指間相連狀（interdigital 佈設在該電路板之基材30上，其一端係作為該帶通濾波器 20之一輸入端21，其另一對應端則係與一第一電感微帶線 ^iL1呈直交相接，該第一電感微帶線L係呈蜿蜒狀（meander line，如：「S」形或倒「u」形），其一端係與一第二電 感微帶線Mu之一端呈直交相接，該第二電感微帶線I亦係 呈婉蜒狀（mender line)(如：rs」形或倒Γυ」形），該 第二電感微帶線ML1之另一端則係與一第三電感微帶線心之 了端呈直父相接，其中該第三電感微帶線L上與該第一電 ^微帶線ML1相連接之一端係作為該帶通濾波器2〇之一輸出 端22 ’該第二電感微帶線L及第三電感微帶線L之另一端 則分別透過該電路板上之一貫穿孔23、24，與該電路板之 另一側面所佈設之一接地面25相連接，且該第二電感微帶 ，心2及第二電感微帶線心係彼此相鄰且平行間隔地設於該 第 電谷彳政帶線MC1之同一侧。如此，藉由適當調整各該微 f線之寬度及長度，即可在該電路板上佈設出該帶通濾波 $ 2 0 ’有效抑制掉不需要之頻率，僅令所需之頻帶通過。 在該較佳實施例中，復參閱第1圖所示，若該等效電Roads are arranged in this space to reduce the area occupied by direct households, and reduce the area occupied by them, and to solve the problem of insufficient installation area. As for the second capacitor q and the third capacitor whose smaller capacitance value is used, Coupling parts of the wiring are made. 8. In the preferred embodiment, referring to FIGS. 2 and 3, the microstrip line corresponding to the bandpass filter 20 includes a first capacitor microstrip line, and the capacitor microstrip line MC1 is Interdigital connection (interdigital is arranged on the substrate 30 of the circuit board, one end of which is used as an input terminal 21 of the bandpass filter 20, and the other corresponding end is connected to a first inductance microstrip line ^ iL1 The first inductive microstrip line L is in a meander line (meander line, such as an "S" shape or an inverted "u" shape), and one end thereof is connected to one end of a second inductive microstrip line Mu. It is orthogonal to each other, the second inductive microstrip line I also has a tender line (such as: rs "shape or inverted Γυ" shape), and the other end of the second inductive microstrip line ML1 is connected to A third inductive microstrip line core has a straight end connected at one end, and one end of the third inductive microstrip line L connected to the first electrical microstrip line ML1 serves as the band-pass filter 2. One output end 22 'The other ends of the second inductive microstrip line L and the third inductive microstrip line L pass through one of the through holes 23 and 24 on the circuit board, respectively, and the electrical A ground plane 25 arranged on the other side of the board is connected, and the second inductive microstrip, the core 2 and the second inductive microstrip line core are adjacent to each other and are arranged on the first electric power strip line MC1 in parallel and spaced apart. The same side. In this way, by properly adjusting the width and length of each micro-f line, the bandpass filter $ 2 0 can be laid on the circuit board to effectively suppress unwanted frequencies, and only make necessary In the preferred embodiment, referring to FIG. 1 again, if the equivalent

第11頁 1246251 五、發明說明（8) 路之第一電容q、第二電容C2及第三電容C：3之電容值，分別 為 2.952 pF、0·0815 pF 及 0.1743pF，該第一電感 Li、第二 電感L2及第三電感L3之電感值，分別為0· 6ηΗ、4· 211nH及 0·632ηΗ，則藉由適當調整各該電容及電感值，再將一無 線通訊產品所產生之高功率發射訊號饋入該帶通濾波器1 〇 之輸入端11後，可模擬出其輸出端1 2之頻率響應，由如第 4圖所示之頻率響應圖可清楚得知，在5· 2GHz之介入耗損 約為0.03692dB，二倍頻諧波10.4 GHz之抑制量為 70.7dB ，ISM (Industrial Scientific Medical bands) _頻帶2· 4GHz之抑制量則為36· 1 3dB，其帶通頻率之寬度約 在5· ：1〜5· 26 GHz，符合日本無線通訊網路之規格，至於， 其鄰近之頻率，如：5 · 3〜5. 8 GHz之頻率，則均被排除， 達到一不錯之抑制效果。 根據前述電容及電感值，利用微帶線製作技術，製作 如第2及3圖所示之窄頻帶通濾波器2〇時，可藉適當調整各 該微帶線之寬度及長度，抑制掉不需要之頻率，僅令所需 之5· 2 GHz頻帶通過。如此，當一無線通訊產品所產生之 高功率發射訊號，被饋入至該帶通濾波器2〇之輸入端21 後，實測其輸出端22之頻率響應，即可由第5圖所示之頻 ’率響應圖清楚得知，在5. 19GHz之介入耗損約為 1.923dB，二倍頻諧波10.5 GHz 之抑制量為35.‘''15dB，ism (Industrial Scientific Medical bands)頻帶2.4GHz 之諧波抑制量則為31.1 8dB，其帶通頻率之寬度約在5 u~ 5· 25 GHz，已符合日本無線通訊網路之規格，至於其鄰近Page 111246251 V. Description of the invention (8) The capacitance values of the first capacitor q, the second capacitor C2 and the third capacitor C: 3 of the circuit are 2.952 pF, 0 · 0815 pF and 0.1743 pF, respectively. The first inductor The inductance values of Li, the second inductance L2, and the third inductance L3 are 0 · 6ηΗ, 4.211nH, and 0 · 632ηΗ, respectively. By appropriately adjusting each of the capacitors and the inductance values, a value generated by a wireless communication product is further adjusted. After the high-power transmission signal is fed into the input terminal 11 of the band-pass filter 10, the frequency response of its output terminal 12 can be simulated. It can be clearly seen from the frequency response diagram shown in Fig. 4 that at 5 · The intervention loss at 2GHz is about 0.03692dB, the suppression amount of the double-frequency harmonic at 10.4 GHz is 70.7dB, and the ISM (Industrial Scientific Medical bands) _ the suppression amount of the band 2 · 4GHz is 36 · 13dB. The width is about 5 ·: 1 ~ 5 · 26 GHz, which conforms to the specifications of the Japanese wireless communication network. As for the adjacent frequencies, such as: 5 · 3 ~ 5. 8 GHz, they are all excluded, achieving a good Inhibitory effect. According to the aforementioned capacitance and inductance values, using the microstrip line production technology to produce the narrow-band pass filter 20 shown in Figures 2 and 3, the width and length of each microstrip line can be appropriately adjusted to suppress the The required frequency passes only the required 5 · 2 GHz band. In this way, when the high-power transmission signal generated by a wireless communication product is fed to the input terminal 21 of the band-pass filter 20, and the frequency response of its output terminal 22 is measured, the frequency shown in FIG. 5 can be obtained. 'The rate response graph clearly shows that the insertion loss at 5.19GHz is about 1.923dB, and the suppression amount of the double-frequency harmonic at 10.5GHz is 35.' '15dB, the harmonic of the 2.4GHz band of ism (Industrial Scientific Medical bands) The wave suppression amount is 31.1 8dB, and the width of its bandpass frequency is about 5 u ~ 5 · 25 GHz, which has already met the specifications of the Japanese wireless communication network.

12462511246251

五、發明說明（9) 之頻率，則均被排除。 據上所述可知，本發明可在無線通訊產品之電路板 上，以微帶線技術製作出一零成本、小尺寸且功能良好之 窄頻帶通濾波為，該窄頻帶通濾波器不僅可有效地降低產 品成本，更可藉適當修改該等電感及電容微帶線之尺寸， 或選用各種不同介電常數之電路板基材，令所製作出之窄 頻帶通濾波器，可有效抑制任何不想要之高頻諧波，僅保 留所欲通過之頻率寬度，進而加快產品腫I法規認證之時 程。 # 以上所述，僅為本發明最佳具體實施例，惟本發明之 構造特徵並不侷限於此，任何熟悉該項技藝者在本發明領 域内，可輕易思及之變化或修飾，皆可涵蓋在以下本案之 專利範圍。5. The frequency of invention description (9) is excluded. According to the above, it can be known that the present invention can produce a narrowband pass filter with zero cost, small size and good function by using microstrip line technology on the circuit board of a wireless communication product. The narrowband pass filter is not only effective To reduce the cost of the product, and by appropriately modifying the size of these inductor and capacitor microstrip lines, or using a variety of circuit board substrates with different dielectric constants, the narrow-band pass filter produced can effectively suppress any unwanted The required high-frequency harmonics only retain the desired frequency width, thereby speeding up the product certification process. # The above descriptions are only the preferred embodiments of the present invention, but the structural features of the present invention are not limited to this. Any person skilled in the art can easily think of changes or modifications in the field of the present invention. Covered in the patent scope of this case below.

1246251 圖式簡單說明 【圖式簡單說明】 第1圖係本發明之一較佳實施例之窄頻帶通濾波器之等效 電路示意圖； 第2圖係第1圖所示窄頻帶通濾波器之微帶線路示意圖； 第3圖係將第2圖所示之微帶線路佈設在一無線通訊產品之 電路板上後，該電路板之局部俯視透視圖； 第4圖係利用第1圖所示之等效電路對無線通訊產品進行濾 波後，模擬之頻率響應圖； 第5圖係利用第2圖所示之微帶線路對無線通訊產品進行濾 •波後，實測之頻率響應圖。 【主要元件符號說明】 帶通濾波器............10、20 輸入端..................11、21 輸出端..................1 2、2 2 貫穿孔..................23、24 接地面..................25 基材.....................301246251 Brief description of the drawings [Simplified description of the drawings] Fig. 1 is a schematic diagram of an equivalent circuit of a narrowband pass filter according to a preferred embodiment of the present invention; Fig. 2 is a diagram of the narrowband pass filter shown in Fig. 1 Schematic diagram of microstrip circuit; Figure 3 is a partial top perspective view of the circuit board after the microstrip circuit shown in Figure 2 is arranged on a circuit board of a wireless communication product; Figure 4 is shown in Figure 1 Equivalent circuit after the wireless communication products are filtered, the simulated frequency response diagram; Figure 5 is the use of microstrip lines shown in Figure 2 to filter the wireless communication products after the wave • measured frequency response diagram. [Description of Symbols of Main Components] Band Pass Filter ............ 10, 20 Input Terminals ............ 11, 21 Output Terminals ........ 1 2, 2 2 Through-holes ... 23, 24 Ground plane .. ... 25 Substrate ... 30

第一電容...............G •第二電容...............C2 第三電容...............C3 第一電感...............Ll 第二電感...............L2 第三電感...............l3First capacitor ............ G • Second capacitor ............ C2 Third capacitor ........ ....... C3 First inductance ......... Ll Second inductance ......... L2 Third inductance. .............. l3

第14頁 1246251 圖式簡單說明 第一電容微帶線……MC1 第一電感微帶線......ML1 第二電感微帶線......ML2 第三電感微帶線……mL3 _ 第15頁Page 1412425 The diagram briefly illustrates the first capacitive microstrip line ... MC1 first inductive microstrip line ... ML1 second inductive microstrip line ... ML2 third inductive microstrip line ... … ML3 _ page 15

(I(I

Claims (1)

12462511246251 六、申請專利範圍 1 種〃佈°又在電路板上用以抑制高頻諧波之窄# 通濾波器’係利用印刷電路板之製作技術，在製作二' 通訊產品之電路板時’以金屬微帶方式，將 ：2 波器所對應，微帶線路，直接製作在該電路板之1 =據 上，其中该微帶線路所包含電容值較大之一 係運用指間相連之方式，佈設在該電路板上U “線， 2如申明專利範圍第1項所述之窄頻帶通濾波哭 中該微帶線路所包含電容值較小之其它電容微帶線了仿i 用佈線中互相耦合之部分，將其製作出來。 ，、J 3、如申請專利範圍第丨項所述之窄頻帶通濾波器， 中該電容微帶線之一端係作為該帶通濾波器之一輪入沪/、 其另一對應端則係與一第一電感微帶線呈直交相接。而 4…、如申請專利範圍第3項所述之窄頻帶通濾波器，其 中该第一電感微帶線係呈蜿蜒狀，其一端係與一第二電感 =帶線之一端呈直交相接，其另一端則係與一第三電感微 帶線之一端呈直交相接，該第三電感微帶線上與該第一電 感微帶線相連接之一端係作為該帶通濾波器之一輸出端。 5、 如申請專利範圍第4項所述之窄頻帶通濾波器，其 中該第二電感微帶線係呈蜿蜒狀，該第二電感微帶線及第 三電感微帶線之另一端分別透過該電路板上之一貫穿孔， 與該電路板之另一侧面所佈設之一接地面相連接，且該第 二電感微帶線及第三電感微帶線係彼此相鄰真平行間隔地 設於該電容微帶線之同一側。 6、 如申請專利範圍第5項所述之窄頻帶通慮波器’其 I國Sixth, the scope of patent application 1 kind of cloth ° and narrow on the circuit board to suppress high-frequency harmonics #pass filter 'is the use of printed circuit board manufacturing technology, in the production of two' communications circuit board ' The metal microstrip method will be: the 2 wave device corresponding to the microstrip line is directly produced on the circuit board 1 = data, where the microstrip line contains a larger capacitance value is the use of inter-finger connection method, The U "line is laid on the circuit board. 2 The narrow-band pass filter described in item 1 of the declared patent scope. The microstrip line contains other capacitor microstrip lines with smaller capacitance values. Coupling part, make it. ,, J 3, as described in the narrow band-pass filter described in the scope of the patent application, one end of the capacitor microstrip line as one of the band-pass filter The other corresponding end is orthogonally connected to a first inductive microstrip line. 4 ... The narrow-band pass filter as described in item 3 of the patent application scope, wherein the first inductive microstrip line is It is meandering, and one end is connected to a second inductor = strip line One end is orthogonally connected, and the other end is orthogonally connected to one end of a third inductive microstrip line, and one end of the third inductive microstrip line connected to the first inductive microstrip line is used as the bandpass. One output end of the filter. 5. The narrow-band pass filter as described in item 4 of the scope of patent application, wherein the second inductance microstrip line is meandering, the second inductance microstrip line and the third inductance The other end of the microstrip line passes through a through hole on the circuit board, and is connected to a ground plane provided on the other side of the circuit board. The second and third inductance microstrip lines are connected to each other. Adjacent to the true microstrip line are located on the same side of the capacitor in parallel. 6. The narrow-band pass filter as described in item 5 of the scope of the patent application. 第16頁 1246251___ 六、申請專利範圍 中該第一電感微帶線及該第二電感微帶線係呈倒「u」形 之婉誕狀。 7、如申請專利範圍第5項所述之窄頻帶通濾波器，其 中該第一電感微帶線及該第二電感微帶線係呈「S」形之 婉埏狀。Page 16 1246251___ 6. In the scope of patent application, the first inductor microstrip line and the second inductor microstrip line have the euphemistic shape of "u". 7. The narrow-band pass filter according to item 5 of the scope of the patent application, wherein the first and second inductive microstrip lines are in the shape of a "S". 第17頁Page 17