TWI829483B - Surface acoustic wave resonators with modulated grating pitches and surface acoustic wave filters thereof - Google Patents
Surface acoustic wave resonators with modulated grating pitches and surface acoustic wave filters thereof Download PDFInfo
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一種共振裝置,特別是涉及一種具有不同週期或柵欄間距之表面聲波共振裝置及其濾波器。A resonance device, in particular, relates to a surface acoustic wave resonance device with different periods or fence spacing and its filter.
表面聲波元件主要應用於無線通訊系統之共振器、高頻濾波器等關鍵零件。表面聲波共振器(Surface Acoustic Wave Resonator)其結構是由一叉指換能器(IDT)及左右兩側反射柵欄(Grating)所構成,當時變信號傳送至輸入端之叉指換能器後,經由逆壓電效應,可將輸入之時變電場轉換成時變聲場,此聲場會沿著基材表面傳播,由於叉指換能器激發出聲波時,其傳播方向是雙向性的,聲波碰到反射柵欄將被反射回到叉指換能器,再經由正壓電效應將聲場轉換為可容易擷取及偵測之電信號,由經由反覆的正、逆壓電效應而形成共振器,而可將多組共振器以串、並聯形式組成階梯狀後,將可被設計成為高頻濾波器一般稱為階梯式濾波器(Ladder Filter)。Surface acoustic wave components are mainly used in key components such as resonators and high-frequency filters in wireless communication systems. The structure of the Surface Acoustic Wave Resonator is composed of an interdigital transducer (IDT) and reflective gratings (Grating) on the left and right sides. After the time-varying signal is transmitted to the IDT at the input end, Through the inverse piezoelectric effect, the input time-varying electric field can be converted into a time-varying sound field. This sound field will propagate along the surface of the substrate. Since the interdigital transducer excites sound waves, its propagation direction is bidirectional. When the sound wave hits the reflective fence, it will be reflected back to the interdigital transducer, and then through the forward piezoelectric effect, the sound field will be converted into an electrical signal that can be easily captured and detected. It is formed by repeated forward and reverse piezoelectric effects. Resonators, and multiple groups of resonators can be connected in series or parallel to form a ladder shape, which can be designed into a high-frequency filter, generally called a ladder filter.
傳統表面聲波共振器的叉指換能器與反射柵欄有同樣的金屬寬度與週期或間距,可稱為同步式共振器(Synchronized Resonator) ,此一類型共振器在頻率低於串聯共振時,反射柵欄之間將會出現干擾(Unwanted Responses),且,由於階梯式濾波器是由多組共振器以串、並聯方式所組成,經反射柵欄所導致的干擾就會在濾波器帶通部份(Band Response)造成漣波干擾(Ripple)。The interdigital transducer of the traditional surface acoustic wave resonator has the same metal width and period or spacing as the reflective fence, which can be called a synchronized resonator. When the frequency of this type of resonator is lower than the series resonance, the reflection Interference (Unwanted Responses) will occur between the fences, and since the ladder filter is composed of multiple sets of resonators connected in series and parallel, the interference caused by the reflected fences will occur in the bandpass part of the filter ( Band Response) causes ripple interference (Ripple).
為此,本發明提供一種具有不同週期或柵欄間距之表面聲波共振裝置及其濾波器,其將兩側的反射柵欄分別設計不同的週期或間距,以降低干擾的產生,為此,以此共振裝置所組成的濾波器,將可有效抑制頻寬內產生的干擾,而可提升通訊品質。To this end, the present invention provides a surface acoustic wave resonance device and its filter with different periods or fence spacings. The reflective fences on both sides are designed with different periods or spacings respectively to reduce the generation of interference. To this end, the resonance The filter formed by the device will effectively suppress interference generated within the bandwidth and improve communication quality.
本發明之主要目的,係提供一種具有不同週期或柵欄間距之表面聲波共振裝置,係以第一反射柵欄及第二反射柵欄分別設置於換能裝置的兩側,同時,所有反射柵欄與換能裝置的金屬寬度比皆相同,且,至少一反射柵欄的週期與換能裝置的週期不同,如此一來,有效減少共振裝置在頻率低於串聯共振時所造成之干擾。The main purpose of the present invention is to provide a surface acoustic wave resonance device with different periods or fence spacing. The first reflective fence and the second reflective fence are respectively arranged on both sides of the transducer device. At the same time, all reflective fences and transducers The metal widths of the devices are all the same, and the period of at least one reflective fence is different from the period of the transducer device. This effectively reduces the interference caused by the resonance device when the frequency is lower than the series resonance.
本發明之另一目的,係提供一種具有不同週期或柵欄間距之表面聲波共振裝置,其可選擇第一反射柵欄與第二反射柵欄為步階式反射柵欄或調變式反射柵欄,並設置於換能裝置之兩側,同時,所有反射柵欄與換能裝置具有相同寬度比,且,至少一反射柵欄之金屬單元間距與換能裝置之金屬單元間距不同,有效減少共振裝置在頻率低於串聯共振時所造成之干擾。Another object of the present invention is to provide a surface acoustic wave resonance device with different periods or fence spacings, in which the first reflective fence and the second reflective fence can be selected as step-type reflective fences or modulated reflective fences, and are arranged on On both sides of the transducer device, at the same time, all reflective fences and the transducer device have the same width ratio, and the metal unit spacing of at least one reflective fence is different from the metal unit spacing of the transducer device, effectively reducing the frequency of the resonance device when the frequency is lower than the series connection Interference caused by resonance.
本發明之再一目的,係提供一種具有不同週期或柵欄間距之表面聲波濾波器,其以多個前述之共振裝置組成T型樣式的濾波器,藉以降低濾波器在帶通部份的漣波干擾。Another object of the present invention is to provide a surface acoustic wave filter with different periods or fence spacing, which uses a plurality of the aforementioned resonance devices to form a T-shaped filter, thereby reducing ripples in the bandpass portion of the filter. interference.
本發明之更一目的,係提供一種具有不同週期或柵欄間距之表面聲波濾波器,其以多個前述之共振裝置組成方形樣式的濾波器,藉以降低濾波器在帶通部份的漣波干擾。Another object of the present invention is to provide a surface acoustic wave filter with different periods or fence spacing, which uses a plurality of the aforementioned resonance devices to form a square-shaped filter, thereby reducing ripple interference in the bandpass portion of the filter. .
為了達到上述之目的,本發明之一實施例係揭示一種具有不同週期或柵欄間距之表面聲波共振裝置,包含: 一第一反射柵欄,包含一第一金屬,該第一金屬具有對應之一第一寬度比及一第一週期;一第二反射柵欄,包含一第二金屬,該第二金屬具有對應之一第二寬度比及一第二週期;及一換能裝置,設置於該第一反射柵欄與該第二反射柵欄之間,該換能裝置包含一第三金屬,該第三金屬具有對應之一第三寬度比及一第三週期;In order to achieve the above object, one embodiment of the present invention discloses a surface acoustic wave resonance device with different periods or fence spacing, including: a first reflective fence, including a first metal, the first metal having a corresponding first a width ratio and a first period; a second reflective barrier including a second metal having a corresponding second width ratio and a second period; and a transducer device disposed on the first Between the reflective fence and the second reflective fence, the transducer device includes a third metal, the third metal has a corresponding third width ratio and a third period;
其中,以該換能裝置接收並依據一通訊訊號進行轉換,產生並傳播一聲波至該第一反射柵欄與該第二反射柵欄,接收並依據自該第一反射柵欄與該第二反射柵欄反射之一反射聲波進行轉換,產生並以該換能裝置輸出一電訊號;Among them, the transducer device receives and converts a communication signal according to it, generates and propagates sound waves to the first reflective fence and the second reflective fence, receives and according to the reflection from the first reflective fence and the second reflective fence A reflected sound wave is converted to generate and output an electrical signal through the transducer;
其中,該第一寬度比等於該第二寬度比,且,該第二寬度比等於該第三寬度比;Wherein, the first width ratio is equal to the second width ratio, and the second width ratio is equal to the third width ratio;
其中,該第一週期等於該第三週期,且,該第二週期不等於該第三週期,或該第一週期不等於該第三週期,且,該第二週期等於該第三週期,或該第一週期不等於該第三週期,且,該第二週期不等於該第三週期;Wherein, the first period is equal to the third period, and the second period is not equal to the third period, or the first period is not equal to the third period, and the second period is equal to the third period, or The first period is not equal to the third period, and the second period is not equal to the third period;
於較佳實施例中,該第一週期、該第二週期及該第三週期係以一演算法、一預設頻率及一預設頻寬進行運算,其中,該演算法為步階函數、柴比雪夫(Chebyshev)函數、開氏貝索視窗加權函數(Kaiser-Bessel window)或漢明窗(Hamming window)。In a preferred embodiment, the first period, the second period and the third period are calculated using an algorithm, a preset frequency and a preset bandwidth, wherein the algorithm is a step function, Chebyshev function, Kaiser-Bessel window or Hamming window.
於較佳實施例中,該第一寬度比、該第二寬度比及該第三寬度比之範圍為0.4-0.6。In a preferred embodiment, the first width ratio, the second width ratio and the third width ratio range from 0.4 to 0.6.
於較佳實施例中,當該第一週期等於該第三週期,且,該第二週期不等於該第三週期時,該第二週期與該第三週期之比例範圍為0.985-0.995,或當該第一週期不等於該第三週期,且,該第二週期等於該第三週期時,該第一週期與該第三週期之比例範圍為0.985-0.995,或該第一週期不等於該第三週期,且,該第二週期不等於該第三週期時,該第一週期與該第三週期之比例範圍為0.985-0.995,且,該第二週期與該第三週期之比例範圍為0.985-0.995。In a preferred embodiment, when the first period is equal to the third period and the second period is not equal to the third period, the ratio of the second period to the third period ranges from 0.985 to 0.995, or When the first period is not equal to the third period, and the second period is equal to the third period, the ratio range of the first period to the third period is 0.985-0.995, or the first period is not equal to the third period. The third period, and when the second period is not equal to the third period, the ratio range of the first period to the third period is 0.985-0.995, and the ratio range of the second period to the third period is 0.985-0.995.
為了達到上述之另一目的,本發明之一實施例係揭示一種具有不同週期或柵欄間距之表面聲波共振裝置,包含: 一第一反射柵欄,包含一第一金屬,該第一金屬具有對應之一第一寬度比,該第一金屬包含一第一金屬單元及一第二金屬單元,該第一金屬單元與該第二金屬單元相鄰設置,該第一金屬單元之一側至該第二金屬單元之一側之間具有一第一間距,且,該第一金屬單元之該側與該第二金屬單元之該側為靠近該第一反射柵欄之一端; 一第二反射柵欄,包含一第二金屬,該第二金屬具有對應之一第二寬度比,該第二金屬包含一第三金屬單元及一第四金屬單元,該第三金屬單元與該第四金屬單元相鄰設置,該第三金屬單元之一側至該第四金屬單元之一側之間具有一第二間距,且,該第三金屬單元之該側與該第四金屬單元之該側為靠近該第二反射柵欄之一端;及一換能裝置,設置於該第一反射柵欄與該第二反射柵欄之間,該換能裝置包含一第三金屬,該第三金屬具有對應之一第三寬度比,該第三金屬包含一第五金屬單元及一第六金屬單元,該第五金屬單元與該第六金屬單元相鄰設置,該第五金屬單元之一側至該第六金屬單元之一側之間具有一第三間距,且,該第五金屬單元之該側與該第六金屬單元之該側為靠近該換能裝置之一端;In order to achieve another of the above objects, one embodiment of the present invention discloses a surface acoustic wave resonance device with different periods or fence spacing, including: a first reflective fence, including a first metal, and the first metal has a corresponding A first width ratio, the first metal includes a first metal unit and a second metal unit, the first metal unit is arranged adjacent to the second metal unit, and one side of the first metal unit reaches the second metal unit. There is a first spacing between one side of the metal unit, and the side of the first metal unit and the side of the second metal unit are close to one end of the first reflective fence; a second reflective fence, including a The second metal has a corresponding second width ratio, the second metal includes a third metal unit and a fourth metal unit, the third metal unit is arranged adjacent to the fourth metal unit, the There is a second distance between one side of the third metal unit and one side of the fourth metal unit, and the side of the third metal unit and the side of the fourth metal unit are close to the second reflective fence. one end; and a transducer device disposed between the first reflective fence and the second reflective fence, the transducer device includes a third metal, the third metal has a corresponding third width ratio, the third The three metals include a fifth metal unit and a sixth metal unit. The fifth metal unit is adjacent to the sixth metal unit. There is a gap between one side of the fifth metal unit and one side of the sixth metal unit. a third distance, and the side of the fifth metal unit and the side of the sixth metal unit are close to one end of the transducer device;
其中,以該換能裝置接收並依據一通訊訊號進行轉換,產生並傳播一聲波至該第一反射柵欄與該第二反射柵欄,接收並依據自該第一反射柵欄與該第二反射柵欄反射之一反射聲波進行轉換,產生並以該換能裝置輸出一電訊號;Among them, the transducer device receives and converts a communication signal according to it, generates and propagates sound waves to the first reflective fence and the second reflective fence, receives and according to the reflection from the first reflective fence and the second reflective fence A reflected sound wave is converted to generate and output an electrical signal through the transducer;
其中,該第一寬度比等於該第二寬度比,且,該第二寬度比等於該第三寬度比;Wherein, the first width ratio is equal to the second width ratio, and the second width ratio is equal to the third width ratio;
其中,該第一間距等於該第三間距,且,該第二間距不等於第三間距,或該第一間距不等於該第三間距,且,該第二間距等於第三間距,或該第一間距不等於該第三間距,且,該第二間距不等於第三間距。Wherein, the first spacing is equal to the third spacing, and the second spacing is not equal to the third spacing, or the first spacing is not equal to the third spacing, and the second spacing is equal to the third spacing, or the third spacing is not equal to the third spacing. A spacing is not equal to the third spacing, and the second spacing is not equal to the third spacing.
於較佳實施例中,該第一間距、該第二間距及該第三間距係以一演算法、一預設頻率及一預設頻寬進行運算,其中,該演算法為步階函數、柴比雪夫(Chebyshev)函數、開氏貝索視窗加權函數(Kaiser-Bessel window)或漢明窗(Hamming window)。In a preferred embodiment, the first spacing, the second spacing and the third spacing are calculated using an algorithm, a preset frequency and a preset bandwidth, wherein the algorithm is a step function, Chebyshev function, Kaiser-Bessel window or Hamming window.
於較佳實施例中,該第一寬度比、該第二寬度比及該第三寬度比之範圍為0.4-0.6。In a preferred embodiment, the first width ratio, the second width ratio and the third width ratio range from 0.4 to 0.6.
於較佳實施例中,當該第一間距等於該第三間距,且,該第二間距不等於第三間距時,該第二間距與該第三間距之比例值範圍為0.985-0.995,或當該第一間距不等於該第三間距,且,該第二間距等於第三間距時,該第一間距與該第三間距之比例值範圍為0.985-0.995,或當該第一間距不等於該第三間距,且,該第二間距不等於第三間距時,該第一間距與該第三間距之比例值範圍為0.985-0.995,且,該第二間距與該第三間距之比例值範圍為0.985-0.995。In a preferred embodiment, when the first spacing is equal to the third spacing, and the second spacing is not equal to the third spacing, the ratio of the second spacing to the third spacing ranges from 0.985 to 0.995, or When the first spacing is not equal to the third spacing, and the second spacing is equal to the third spacing, the ratio range of the first spacing to the third spacing is 0.985-0.995, or when the first spacing is not equal to When the third spacing is not equal to the third spacing, the ratio of the first spacing to the third spacing ranges from 0.985 to 0.995, and the ratio of the second spacing to the third spacing is The range is 0.985-0.995.
為了達到上述之再一目的,本發明之一實施例係揭示一種具有不同週期之表面聲波濾波器,包含: 一第一共振裝置,係如上述任一項所述之具有不同週期之表面聲波共振裝置;一第二共振裝置,係如上述任一項所述之具有不同週期之表面聲波共振裝置,該第二共振裝置之一端係與該第一共振裝置之一端連接;及一第三共振裝置,係如上述任一項所述之具有不同週期之表面聲波共振裝置,該第三共振裝置之一端係與該第一共振裝置之一端連接。In order to achieve the above object, one embodiment of the present invention discloses a surface acoustic wave filter with different periods, including: a first resonance device, which is a surface acoustic wave resonance with different periods as described in any one of the above. Device; a second resonance device, which is a surface acoustic wave resonance device with different periods as described in any of the above, one end of the second resonance device is connected to one end of the first resonance device; and a third resonance device , is a surface acoustic wave resonance device with different periods as described in any one of the above, and one end of the third resonance device is connected to one end of the first resonance device.
為了達到上述之更一目的,本發明之一實施例係揭示一種具有不同週期之表面聲波濾波器,包含:一第一共振裝置,係如上述任一項所述之具有不同週期之表面聲波共振裝置;一第二共振裝置,係如上述任一項所述之具有不同週期之表面聲波共振裝置,該第二共振裝置之一端係與該第一共振裝置之一端連接;一第三共振裝置,係如上述任一項所述之具有不同週期之表面聲波共振裝置,該第三共振裝置之一端係與該第一共振裝置之另一端連接;及一第四共振裝置,係如上述任一項所述之具有不同週期之表面聲波共振裝置,該第四共振裝置之一端係與該第二共振裝置之另一端連接,且,該第四共振裝置之另一端係與該第三共振裝置之另一端連接。In order to achieve the above-mentioned further object, one embodiment of the present invention discloses a surface acoustic wave filter with different periods, including: a first resonance device, which is a surface acoustic wave resonance with different periods as described in any one of the above. Device; a second resonance device, which is a surface acoustic wave resonance device with different periods as described in any of the above items, one end of the second resonance device is connected to one end of the first resonance device; a third resonance device, It is a surface acoustic wave resonance device with different periods as described in any one of the above, one end of the third resonance device is connected to the other end of the first resonance device; and a fourth resonance device is as any one of the above In the surface acoustic wave resonance device with different periods, one end of the fourth resonance device is connected to the other end of the second resonance device, and the other end of the fourth resonance device is connected to the other end of the third resonance device. Connect one end.
本發明之有益功效在於解決表面聲波同步式共振裝置在頻率低於串聯共振時所造成之干擾,同時,由於濾波器的結構上是由多組串、並聯共振裝置所組成,為此,以本發明的共振裝置組成的濾波器可大幅改善同步式共振裝置干擾,並降低濾波器在帶通部份之漣波干擾。The beneficial effect of the present invention is to solve the interference caused by the surface acoustic wave synchronous resonance device when the frequency is lower than the series resonance. At the same time, since the filter structure is composed of multiple sets of series and parallel resonance devices, for this reason, this invention The filter composed of the invented resonance device can greatly improve the interference of the synchronous resonance device and reduce the ripple interference in the bandpass part of the filter.
為讓本發明上述及 / 或其他目的、功效、特徵更明顯易懂,下文特舉較佳實施方式,作詳細說明於下:In order to make the above and/or other objects, effects, and features of the present invention more obvious and understandable, the following is a detailed description of the preferred embodiments:
請參閱第一A圖、第一B圖及第一C圖,其為本發明之一實施例共振裝置示意圖、反射柵欄示意圖及換能裝置示意圖。如圖所示,本發明之具有不同週期之表面聲波共振裝置R,包含: 第一反射柵欄1、第二反射柵欄2及換能裝置3,並詳細說明如下:Please refer to the first Figure A, the first Figure B and the first Figure C, which are schematic diagrams of the resonance device, the reflective fence and the transducer device according to one embodiment of the present invention. As shown in the figure, the surface acoustic wave resonance device R with different periods of the present invention includes: a first
第一反射柵欄1包含第一金屬11,第一金屬11包含第一金屬單元111與第二金屬單元112,且,第一金屬單元111與第二金屬單元112的數量可依據需求進行設置,但不在此限。The first
於一實施例中,第一金屬單元111與第二金屬單元112相鄰設置,第一金屬單元111之一側至第二金屬單元112之一側之間具有第一間距PG1,其中,第一間距PG1係第一金屬單元111之該側與第二金屬單元112之該側為靠近第一反射柵欄1之一端,即第一間距PG1包含其中第一金屬單元111的第一寬度MG1及第一金屬單元111之該側與第二金屬單元112之該側之間的空隙寬度,但不在此限。In one embodiment, the first metal unit 111 and the second metal unit 112 are arranged adjacent to each other, and there is a first distance PG1 between one side of the first metal unit 111 and one side of the second metal unit 112 , where the first The pitch PG1 is that the side of the first metal unit 111 and the side of the second metal unit 112 are close to one end of the first
於一實施例中,第一金屬11具有對應之第一寬度比MR1及第一週期,其中,第一寬度比MR1係第一寬度MG1除以第一間距PG1,即MR1=MG1/PG1,但不在此限。In one embodiment, the
第二反射柵欄2包含第二金屬21,第二金屬21包含第三金屬單元211與第四金屬單元212,且,第三金屬單元211與第四金屬單元212的數量可依據需求進行設置,但不在此限。The second
於一實施例中,第三金屬單元211與第四金屬單元212相鄰設置,第三金屬單元211之一側至第四金屬單元212之一側之間具有第二間距PG2,其中,第二間距PG2係第三金屬單元211之該側與第四金屬單元212之該側為靠近第二反射柵欄2之一端,即第二間距PG2包含其中第三金屬單元211的第二寬度MG2及第三金屬單元211之該側與第四金屬單元212之該側之間的空隙寬度,但不在此限。In one embodiment, the
於一實施例中,第二金屬21具有對應之第二寬度比MR2及第二週期,其中,第二寬度比MR2係第二寬度MG2除以第二間距PG2,即MR2=MG2/PG2,但不在此限。In one embodiment, the
換能裝置3設置於第一反射柵欄1與第二反射柵欄2之間,換能裝置3包含第三金屬31,第三金屬31包含第五金屬單元311與第六金屬單元312,且,第五金屬單元311與第六金屬單元312的數量可依據需求進行設置,但不在此限。The transducing
於一實施例中,換能裝置3以接收端接收通訊訊號,由於逆壓電效應將通訊訊號進行轉換,而產生聲波,此時,聲波將由換能裝置3兩側傳遞至第一反射柵欄1與第二反射柵欄2,聲波經第一反射柵欄1與第二反射柵欄2共振後,將會形成反射聲波回傳至換能裝置3,並經正壓電效應將反射聲波轉換為電訊號,最後換能裝置3以輸出端將電訊號輸出。In one embodiment, the transducing
於一實施例中,第五金屬單元311與第六金屬單元312相鄰設置,第五金屬單元311之一側至第六金屬單元312之一側之間具有第三間距P
IDT,其中,第三間距P
IDT係第五金屬單元311之該側與第六金屬單元312之該側為靠近換能裝置3之一端,即第三間距P
IDT包含其中第五金屬單元311的第三寬度M
IDT及第五金屬單元311之該側與第六金屬單元312之該側之間的空隙寬度,但不在此限。
In one embodiment, the
於一實施例中,第三金屬31具有對應之第三寬度比MR
IDT及第三週期,其中,第三寬度比MR
IDT係第三寬度M
IDT除以第三間距P
IDT,即MR
IDT=M
IDT/P
IDT,但不在此限。
In one embodiment, the
於一實施例中,第一寬度比MR1等於第二寬度比MR2,且,第二寬度比MR2等於第三寬度比MR IDT,其中,第一寬度比MR1、第二寬度比MR2及第三寬度比MR IDT之範圍為0.4-0.6,但不在此限。 In one embodiment, the first width ratio MR1 is equal to the second width ratio MR2 , and the second width ratio MR2 is equal to the third width ratio MR IDT , where the first width ratio MR1 , the second width ratio MR2 and the third width The range of MR IDT is 0.4-0.6, but not limited to this.
於一實施例中,第一金屬11的第一週期等於第三金屬31的第三週期,且,第二金屬21的第二週期不等於第三金屬31的第三週期,此時,第二週期與第三週期比值約為0.985-0.995;In one embodiment, the first period of the
或第一金屬11的第一週期不等於第三金屬31的第三週期,且,第二金屬21的第二週期等於第三金屬31的第三週期,此時,第一週期與第三週期比值約為0.985-0.995;Or the first period of the
或第一金屬11的第一週期不等於第三金屬31的第三週期,且,第二金屬21的第二週期不等於第三金屬31的第三週期,此時,第一週期與第三週期比值約為0.985-0.995,且,第二週期與第三週期比值約為0.985-0.995。Or the first period of the
即至少是第一金屬11或第二金屬的週期不等於第三週期,以此組成非同步式的共振裝置R,但不在此限。That is, at least the period of the
於一實施例中,第一金屬單元111與第二金屬單元112之間的第一間距PG1等於第五金屬單元311與第六金屬單元312之間的第三間距P
IDT,且,第三金屬單元211與第四金屬單元212之間的第二間距PG2不等於第五金屬單元311與第六金屬單元312之間的第三間距P
IDT,此時,第二間距PG2與第三間距P
IDT比值約為0.985-0.995;
In one embodiment, the first pitch PG1 between the first metal unit 111 and the second metal unit 112 is equal to the third pitch PIDT between the
或第一金屬單元111與第二金屬單元112之間的第一間距PG1不等於第五金屬單元311與第六金屬單元312之間的第三間距P
IDT,且,第三金屬單元211與第四金屬單元212之間的第二間距PG2等於第五金屬單元311與第六金屬單元312的第三間距P
IDT,此時,第一間距PG1與第三間距P
IDT比值約為0.985-0.995;
Or the first pitch PG1 between the first metal unit 111 and the second metal unit 112 is not equal to the third pitch PIDT between the
或第一金屬單元111與第二金屬單元112之間的第一間距PG1不等於第五金屬單元311與第六金屬單元312之間的第三間距P
IDT,且,第三金屬單元211與第四金屬單元212之間的第二間距PG2不等於第五金屬單元311與第六金屬單元312之間的第三間距P
IDT,此時,第一間距PG1與第三間距P
IDT比值約為0.985-0.995,且,第二間距PG2與第三間距P
IDT比值約為0.985-0.995。
Or the first pitch PG1 between the first metal unit 111 and the second metal unit 112 is not equal to the third pitch PIDT between the
即至少是第一金屬11的金屬單元之間的間距或第二金屬21的金屬單元之間的間距不等於第三金屬31的金屬單元之間的間距,以此組成非同步式的共振裝置R,但不在此限。That is, at least the distance between the metal units of the
於一實施例中,當共振裝置R為非同步式時,與換能裝置3不同週期或間距之反射柵欄可為調變式或步階式,其中,調變式係當金屬單元數量為2個以上時,且,每一個相鄰的金屬單元之間的每一個週期或間距皆為不同,而步階式係當金屬單元數量為2個以上時,且,每一個相鄰的金屬單元之間的每一個週期或間距以步階函數設計而成,請參閱第二圖,其為本發明之一實施例調變式反射柵欄示意圖。如圖所示,以第一反射柵欄11的金屬單元數量為10個為例,則表示有10個間距即PG10 / PG11 / PG12 / PG13 / PG14 / PG15 / PG16 / PG17 / PG18 / PG19,其依序由靠近反射柵欄的一端排序至靠近反射柵欄的另一端,分別為PG10 = 0.99, PG11 = 0.9925, PG12 = 0.9950, PG13 = 0.9975, PG14 = 1, PG15 = 1, PG16 = 0.9975, PG17 = 0.9950, PG18 = 0.9925, PG19 = 0.99,但不在此限。In one embodiment, when the resonant device R is asynchronous, the reflective fences with different periods or spacings from the
其中,所有的週期或間距設計,可採用演算法、預設頻率及預設頻寬進行運算,於一實施例中,演算法可為步階函數、柴比雪夫(Chebyshev)函數、開氏貝索視窗加權函數(Kaiser-Bessel window)或漢明窗(Hamming window),但不在此限。Among them, all period or spacing designs can be calculated using an algorithm, a preset frequency and a preset bandwidth. In one embodiment, the algorithm can be a step function, a Chebyshev function, or a Kelvin Search window weighting function (Kaiser-Bessel window) or Hamming window (Hamming window), but not limited to this.
為更清楚說明一實施例之調變式反射柵欄之週期或間距設計方案,舉例如下:In order to more clearly illustrate the period or spacing design scheme of the modulated reflective barrier in one embodiment, the following is an example:
以中心頻率1747.5MHz與頻寬75MHz之階梯式濾波器之射頻濾波器為例,其中,第一金屬11之第一寬度比MR1、第二金屬21之第二寬度比MR2及第三金屬31之第三寬度比MR
IDT皆相同,惟至少第一金屬11或/及第二金屬21與第三金屬31具有不同週期或間距,且,與第三金屬31不同週期或間距的第一金屬11或/及第二金屬21,其週期或間距之設計,採用步階法則。
Taking the radio frequency filter of the ladder filter with a center frequency of 1747.5MHz and a bandwidth of 75MHz as an example, the first width ratio MR1 of the
請一併參閱第三圖,其為本發明之一實施例之同步式共振裝置與步階式反射柵欄所組成之非同步共振裝置之干擾響應圖。如圖所示,其中,上圖為同步式共振裝置之干擾響應(箭頭處),下圖為步階式反射柵欄所組成之非同步共振裝置之干擾響應(箭頭處),可明顯看出,步階式反射柵欄於頻率低於串聯共振時,其所產生之干擾有明顯的減少,即抑制於1.74GHz的干擾。Please also refer to the third figure, which is an interference response diagram of an asynchronous resonance device composed of a synchronous resonance device and a stepped reflective fence according to an embodiment of the present invention. As shown in the figure, the upper picture shows the interference response of the synchronous resonance device (arrow), and the lower picture shows the interference response (arrow) of the asynchronous resonance device composed of stepped reflective fences. It can be clearly seen that, When the frequency of the stepped reflective fence is lower than the series resonance, the interference generated by it is significantly reduced, that is, the interference is suppressed to 1.74GHz.
同時,參閱第四圖,其為本發明之一實施例之以同步式共振裝置所組成之階梯式濾波器與以步階式反射柵欄所組成之非同步共振裝置所組成之階梯式濾波器之帶通部份漣波響應圖。如圖所示,上圖為以同步式共振裝置所組成之階梯式濾波器之帶通部份漣波響應,下圖為以步階式反射柵欄所組成之非同步共振裝置所組成之階梯式濾波器之帶通部份漣波響應,並比較這兩者階梯式濾波器於帶通部份之漣波,同樣可以發現採用調變式反射柵欄時,可以明顯降低階梯式濾波器之帶通漣波,即抑制於1.74GHz的干擾。At the same time, please refer to the fourth figure, which shows a step-type filter composed of a synchronous resonance device and a step-type filter composed of an asynchronous resonance device composed of a stepped reflective barrier according to one embodiment of the present invention. Bandpass partial ripple response diagram. As shown in the figure, the upper picture shows the ripple response of the bandpass part of a stepped filter composed of a synchronous resonance device, and the lower picture shows a stepped filter composed of an asynchronous resonance device composed of a stepped reflective fence. The ripple response of the bandpass part of the filter, and comparing the ripples of the two ladder filters in the bandpass part, it can also be found that using a modulated reflective barrier can significantly reduce the bandpass of the ladder filter. Ripple, that is, interference suppressed at 1.74GHz.
請參閱第五A圖至第五D圖,其為本發明之第一實施例、第二實施例、第三實施例及第四實施例之濾波器示意圖。如圖所示,第一實施例係以三個共振裝置R形成濾波器F,即以前述所載之共振裝置R,分別配置為第一共振裝置R1、第二共振裝置R2及第三共振裝置R3,其中,第一共振裝置R1之一端與第二共振裝置R2之一端連接,且,第一共振裝置R1之一端與第三共振裝置R3之一端連接,此時,第一共振裝置R1、第二共振裝置R2及第三共振裝置R3形成T字形結構,且,於一實施例中,可同時組合多組這樣的T字形結構,以形成濾波器F,但不在此限。Please refer to Figures 5A to 5D, which are schematic diagrams of filters according to the first, second, third and fourth embodiments of the present invention. As shown in the figure, the first embodiment uses three resonant devices R to form a filter F. That is, the resonant devices R mentioned above are respectively configured as a first resonant device R1, a second resonant device R2, and a third resonant device. R3, where one end of the first resonance device R1 is connected to one end of the second resonance device R2, and one end of the first resonance device R1 is connected to one end of the third resonance device R3. At this time, the first resonance device R1 and the third resonance device R3 The second resonance device R2 and the third resonance device R3 form a T-shaped structure, and in one embodiment, multiple groups of such T-shaped structures can be combined simultaneously to form the filter F, but this is not a limitation.
第二實施例係以四個共振裝置R形成濾波器F,即以前述所載之共振裝置R,分別配置為第一共振裝置R1、第二共振裝置R2、第三共振裝置R3及第四共振裝置R4,其與第一實施例之差別在於第四共振裝置R4係與第三共振裝置R3並聯,此時,第一共振裝置R1、第二共振裝置R2、第三共振裝置R3及第四共振裝置R4將形成π字形結構,且,於一實施例中,可同時組合多組這樣的π字形結構,以形成濾波器F,但不在此限。The second embodiment uses four resonant devices R to form the filter F. That is, the resonant devices R mentioned above are respectively configured as a first resonant device R1, a second resonant device R2, a third resonant device R3 and a fourth resonant device. The difference between the device R4 and the first embodiment is that the fourth resonance device R4 is connected in parallel with the third resonance device R3. At this time, the first resonance device R1, the second resonance device R2, the third resonance device R3 and the fourth resonance device R4 are connected in parallel. The device R4 will form a π-shaped structure, and in one embodiment, multiple groups of such π-shaped structures can be combined simultaneously to form the filter F, but this is not a limitation.
第三實施例係以四個共振裝置R形成濾波器F,即以前述所載之共振裝置R,分別配置為第一共振裝置R1、第二共振裝置R2、第三共振裝置R3及第五共振裝置R5,其與第一實施例之差別在於第五共振裝置R5之一端係與第二共振裝置R2之另一端連接,使得第三共振裝置R3設置於第一共振裝置R1與第二共振裝置R2之間,且,第二共振裝置R2設置於第三共振裝置R3與第五共振裝置R5之間,且,於一實施例中,可同時組合多組這樣的配置結構,以形成濾波器F,但不在此限。The third embodiment uses four resonant devices R to form the filter F. That is, the resonant devices R mentioned above are respectively configured as a first resonant device R1, a second resonant device R2, a third resonant device R3, and a fifth resonant device. The difference between the device R5 and the first embodiment is that one end of the fifth resonance device R5 is connected to the other end of the second resonance device R2, so that the third resonance device R3 is disposed between the first resonance device R1 and the second resonance device R2 between, and the second resonance device R2 is disposed between the third resonance device R3 and the fifth resonance device R5, and, in one embodiment, multiple groups of such configuration structures can be combined simultaneously to form the filter F, But this is not the case.
第四實施例係以四個共振裝置R形成濾波器F,即以前述所載之共振裝置R,分別配置為第一共振裝置R1、第二共振裝置R2、第三共振裝置R3及第四共振裝置R4,其中,第一共振裝置R1之一端與第二共振裝置R2之一端連接,第一共振裝置R1之另一端與第三共振裝置R3之一端連接,第四共振裝置R4之一端與第二共振裝置R2之另一端連接,且,第四共振裝置R4之另一端與第三共振裝置R3之另一端連接,使得第一共振裝置R1、第二共振裝置R2、第三共振裝置R3及第四共振裝置R4將形成方形結構,且,於一實施例中,可同時組合多組這樣的方形結構,以形成濾波器F,但不在此限。The fourth embodiment uses four resonant devices R to form the filter F. That is, the resonant devices R mentioned above are respectively configured as a first resonant device R1, a second resonant device R2, a third resonant device R3, and a fourth resonant device. Device R4, in which one end of the first resonance device R1 is connected to one end of the second resonance device R2, the other end of the first resonance device R1 is connected to one end of the third resonance device R3, and one end of the fourth resonance device R4 is connected to the second end of the second resonance device R4. The other end of the resonance device R2 is connected, and the other end of the fourth resonance device R4 is connected to the other end of the third resonance device R3, so that the first resonance device R1, the second resonance device R2, the third resonance device R3 and the fourth resonance device R2 are connected to each other. The resonance device R4 will form a square structure, and in one embodiment, multiple groups of such square structures can be combined simultaneously to form the filter F, but this is not a limitation.
綜上所述,本發明提供一種具有不同週期之表面聲波共振裝置及其濾波器,其至少一側的反射柵欄之週期或間距與換能裝置之週期或間距為不同,並以之形成共振裝置,可有效抑制頻寬內的干擾,並以多個共振裝置組合為具有不同結構的濾波器,而可明顯降低濾波器的帶通漣波,進而提升通訊品質。To sum up, the present invention provides a surface acoustic wave resonance device with different periods and a filter thereof. The period or spacing of the reflective fence on at least one side is different from the period or spacing of the transducer device, and a resonance device is formed therefrom. , can effectively suppress interference within the bandwidth, and combine multiple resonance devices into filters with different structures, which can significantly reduce the bandpass ripple of the filter, thereby improving communication quality.
惟以上所述者,僅為本發明之較佳實施例,但不能以此限定本發明實施之範圍;故,凡依本發明申請專利範圍及說明書內容所做之簡單的等效改變與修飾,皆仍屬本發明專利涵蓋之範圍內。However, the above are only preferred embodiments of the present invention, but they cannot be used to limit the scope of the present invention; therefore, any simple equivalent changes and modifications made based on the patent scope of the present invention and the content of the specification, All are still within the scope of the patent of this invention.
1:第一反射柵欄 11:第一金屬 111:第一金屬單元 112:第二金屬單元 2:第二反射柵欄 21:第二金屬 211:第三金屬單元 212:第四金屬單元 3:換能裝置 31:第三金屬 311:第五金屬單元 312:第六金屬單元 F:濾波器 MG1:第一寬度 MG2:第二寬度 M IDT:第三寬度 PG1:第一間距 PG10:間距 PG11:間距 PG12:間距 PG13:間距 PG14:間距 PG15:間距 PG16:間距 PG17:間距 PG18:間距 PG19:間距 PG2:第二間距 P IDT:第三間距 R:共振裝置 R1:第一共振裝置 R2:第二共振裝置 R3:第三共振裝置 R4:第四共振裝置 R5:第五共振裝置 1: first reflective fence 11: first metal 111: first metal unit 112: second metal unit 2: second reflective fence 21: second metal 211: third metal unit 212: fourth metal unit 3: transducer Device 31: third metal 311: fifth metal unit 312: sixth metal unit F: filter MG1: first width MG2: second width M IDT : third width PG1: first pitch PG10: pitch PG11: pitch PG12 :Pitch PG13:Pitch PG14:Pitch PG15:Pitch PG16:Pitch PG17:Pitch PG18:Pitch PG19:Pitch PG2:Second pitch P IDT :Third pitch R: Resonance device R1: First resonance device R2: Second resonance device R3: The third resonance device R4: The fourth resonance device R5: The fifth resonance device
第一A圖: 其為本發明之一實施例之共振裝置示意圖; 第一B圖: 其為本發明之一實施例之反射柵欄示意圖; 第一C圖: 其為本發明之一實施例之換能裝置示意圖; 第二圖: 其為本發明之一實施例之調變式反射柵欄示意圖; 第三圖: 其為本發明之一實施例之同步式共振裝置與步階式反射柵欄所組成之非同步共振裝置之干擾響應圖; 第四圖: 其為本發明之一實施例之以同步式共振裝置所組成之階梯式濾波器與以步階式反射柵欄所組成之非同步共振裝置所組成之階梯式濾波器之帶通部份漣波響應圖; 第五A圖: 其為本發明之第一實施例之濾波器示意圖; 第五B圖: 其為本發明之第二實施例之濾波器示意圖; 第五C圖: 其為本發明之第三實施例之濾波器示意圖;及 第五D圖: 其為本發明之第四實施例之濾波器示意圖。 Figure 1 A: It is a schematic diagram of a resonance device according to an embodiment of the present invention; Figure 1: This is a schematic diagram of a reflective fence according to an embodiment of the present invention; First Figure C: It is a schematic diagram of the transducer device according to an embodiment of the present invention; The second figure: This is a schematic diagram of a modulation reflective barrier according to an embodiment of the present invention; The third figure: This is an interference response diagram of an asynchronous resonance device composed of a synchronous resonance device and a stepped reflective fence according to an embodiment of the present invention; Figure 4: This is the bandpass section of a ladder filter composed of a synchronous resonance device and an asynchronous resonance device composed of a stepped reflective barrier according to an embodiment of the present invention. ripple response diagram; Figure 5A: This is a schematic diagram of the filter according to the first embodiment of the present invention; Figure 5B: This is a schematic diagram of the filter according to the second embodiment of the present invention; Figure 5C: This is a schematic diagram of the filter according to the third embodiment of the present invention; and Figure 5D: This is a schematic diagram of the filter according to the fourth embodiment of the present invention.
1:第一反射柵欄 1: First reflective fence
2:第二反射柵欄 2:Second reflective fence
3:換能裝置 3: Transducer device
R:共振裝置 R: Resonance device
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