TW201310772A - Impedance matching circuit and tunable antenna apparatus - Google Patents
Impedance matching circuit and tunable antenna apparatus Download PDFInfo
- Publication number
- TW201310772A TW201310772A TW100129428A TW100129428A TW201310772A TW 201310772 A TW201310772 A TW 201310772A TW 100129428 A TW100129428 A TW 100129428A TW 100129428 A TW100129428 A TW 100129428A TW 201310772 A TW201310772 A TW 201310772A
- Authority
- TW
- Taiwan
- Prior art keywords
- adjustable
- frequency
- impedance matching
- capacitor
- unit
- Prior art date
Links
Abstract
Description
本發明係關於一種天線裝置，特別關於一種阻抗匹配電路以及應用阻抗匹配電路之可調天線裝置。The present invention relates to an antenna device, and more particularly to an impedance matching circuit and a tunable antenna device using the impedance matching circuit.
近年來隨著通訊技術日新月異，如手機等無線通訊裝置儼然已成為現代生活中不可或缺的一部份，加上現代人常因商務訪問或旅行須頻繁往來世界各地，所以能接收/傳送多頻帶無線電訊號已成為無線通訊裝置必備之功能。In recent years, with the rapid development of communication technologies, wireless communication devices such as mobile phones have become an indispensable part of modern life. In addition, modern people often have to travel to and from the world frequently because of business visits or travel, so they can receive/transmit more. Band radio signals have become a must-have feature for wireless communication devices.
然而，世界各地無線通訊標準皆不相同，所以現今無線通訊裝置多以設計多頻帶天線或多支不同頻帶的天線方式來接收/傳送不同頻帶之無線電訊號。但多頻帶天線其研發上有一定困難。如圖1所示，其係利用頻帶切換電路來切換不同的調諧匹配電路及其對應天線元件，以接收及傳送多頻帶之無線電訊號，但利用多支不同頻帶的天線卻存在需耗費較多製作成本的問題。However, wireless communication standards are different around the world, so today's wireless communication devices mostly design multi-band antennas or multiple antennas of different frequency bands to receive/transmit radio signals of different frequency bands. However, multi-band antennas have certain difficulties in their development. As shown in FIG. 1, the band switching circuit is used to switch different tuning matching circuits and their corresponding antenna elements to receive and transmit multi-band radio signals. However, the use of multiple antennas of different frequency bands requires more processing. The problem of cost.
另外，圖2為台灣公開號200931719所揭露之一種可調式天線裝置，其係藉由切換不同的調諧匹配電路電性連接至天線元件的方式，來產生不同頻帶頻率以接收/傳送多頻帶無線電訊號。In addition, FIG. 2 is a tunable antenna device disclosed in Taiwan Publication No. 200931719, which generates different frequency bands to receive/transmit multi-band radio signals by switching different tuning matching circuits electrically connected to the antenna elements. .
上述天線裝置皆需設置多個天線或多個匹配電路，再藉由開關進行切換，以達到多頻可調的功能；然而，多個天線以及匹配電路與開關係使成本增加。並且，上述天線在本質上還是把多個操作於不同頻段之天線或匹配電路作在一起，並無法達到各頻段可調之效果。究其原因，上述天線之發明皆未深入研究阻抗匹配電路對操作頻段造成的影響。All of the above antenna devices need to be provided with multiple antennas or multiple matching circuits, and then switched by switches to achieve multi-frequency adjustable functions; however, the relationship between multiple antennas and matching circuits increases the cost. Moreover, the antenna described above essentially combines multiple antennas or matching circuits operating in different frequency bands, and cannot achieve the adjustable effect of each frequency band. The reason for this is that the invention of the above antenna has not thoroughly studied the effect of the impedance matching circuit on the operating frequency band.
因此，如何找出一種天線裝置之阻抗匹配電路，能夠達到多頻、各頻段可調的效果，進而大幅降低成本、並提升天線效能與產品競爭力，實為當前重要課題之一。Therefore, how to find an impedance matching circuit of an antenna device can achieve the effect of multi-frequency and adjustable frequency bands, thereby greatly reducing the cost and improving the antenna performance and product competitiveness, which is one of the current important topics.
有鑑於上述課題，本發明之目的為提供一種能夠達到多頻、各頻段可調效果之阻抗匹配電路與可調天線裝置。In view of the above problems, an object of the present invention is to provide an impedance matching circuit and a tunable antenna device capable of achieving multi-frequency and adjustable frequency bands.
為達上述目的，依據本發明之一種應用於寬頻天線之阻抗匹配電路包含複數電路分支，電路分支係彼此並聯，並各包含一可調電感性單元以及一頻率選擇單元。To achieve the above object, an impedance matching circuit for a wideband antenna according to the present invention includes a plurality of circuit branches which are connected in parallel with each other and each including a tunable inductive unit and a frequency selecting unit.
在一實施例中，可調電感性單元包含一電感器與一可調電容器。In an embodiment, the adjustable inductive unit comprises an inductor and an adjustable capacitor.
在一實施例中，頻率選擇單元包含一電感器。In an embodiment, the frequency selection unit comprises an inductor.
在一實施例中，頻率選擇單元包含一電容器。In an embodiment, the frequency selection unit comprises a capacitor.
在一實施例中，可調電感性單元與頻率選擇單元係串聯。In an embodiment, the adjustable inductive unit is in series with the frequency selective unit.
在一實施例中，阻抗匹配電路包含三電路分支，其中一電路分支之該頻率選擇單元包含一電容器，另一電路分支之該頻率選擇單元包含另一電容器，另一電路分支之該頻率選擇單元包含一電感器。In one embodiment, the impedance matching circuit includes three circuit branches, wherein the frequency selection unit of one circuit branch includes a capacitor, the frequency selection unit of another circuit branch includes another capacitor, and the frequency selection unit of another circuit branch Includes an inductor.
在一實施例中，阻抗匹配電路更包含一電容單元，其分別與該等電路分支及該寬頻天線之一天線負載阻抗電性連接。In an embodiment, the impedance matching circuit further includes a capacitor unit electrically connected to the circuit branches and the antenna load impedance of the broadband antenna.
在一實施例中，阻抗匹配電路更包含一電容單元，其分別與該等電路分支及一系統阻抗電性連接。In an embodiment, the impedance matching circuit further includes a capacitor unit electrically connected to the circuit branches and a system impedance, respectively.
為達上述目的，依據本發明之一種可調天線裝置包含一寬頻天線以及如上所述之任一阻抗匹配電路。寬頻天線具有一饋入端，阻抗匹配電路與饋入端電性耦接。To achieve the above object, a tunable antenna device in accordance with the present invention includes a wideband antenna and any of the impedance matching circuits described above. The broadband antenna has a feed end, and the impedance matching circuit is electrically coupled to the feed end.
承上所述，經過本發明之努力研究及探討，發現到一種單一阻抗匹配電路能夠達到多頻、各頻段可調的效果。該阻抗匹配電路包含複數電路分支，該等電路分支係彼此並聯，並各包含一可調電感性單元以及一頻率選擇單元。其中，可調電感性單元係可調。藉由頻率選擇單元可達到多頻效果(如低頻、中頻、高頻)，並且藉由調整可調電感性單元之等效電感值，而能達到各頻段獨立可調以及連續可調之效果。因此，本發明能夠大幅提升天線效能與產品競爭力。According to the above research and discussion, it has been found that a single impedance matching circuit can achieve multi-frequency and adjustable frequency bands. The impedance matching circuit includes a plurality of circuit branches that are connected in parallel with each other and each include a tunable inductive unit and a frequency selecting unit. Among them, the adjustable inductive unit is adjustable. Multi-frequency effects (such as low frequency, intermediate frequency, high frequency) can be achieved by the frequency selection unit, and by adjusting the equivalent inductance value of the adjustable inductive unit, the frequency band can be independently adjusted and continuously adjustable. . Therefore, the present invention can greatly improve antenna performance and product competitiveness.
以下將參照相關圖式，說明依本發明較佳實施例之一種阻抗匹配電路與可調天線裝置，其中相同的元件將以相同的參照符號加以說明。An impedance matching circuit and a tunable antenna device according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings, wherein like elements will be described with the same reference numerals.
圖3為本發明較佳實施例之一種可調天線裝置1及其阻抗匹配電路10的示意圖。阻抗匹配電路10係應用於一寬頻天線，圖3所示之阻抗Z1係代表寬頻天線之一天線負載阻抗，而阻抗Z2係代表系統阻抗。本發明不特別限制所應用之寬頻天線之形狀或種類，其可例如為平面型天線。上述之「寬頻」係指利用本實施例之阻抗匹配電路10可在該寬頻天線之頻寬內選取2個以上之頻段並進行調整，即足以作為上述之寬頻意義。寬頻天線具有一饋入端，阻抗匹配電路10與饋入端電性耦接，此二者之電性耦接係由節點N1表示。3 is a schematic diagram of a tunable antenna device 1 and its impedance matching circuit 10 in accordance with a preferred embodiment of the present invention. The impedance matching circuit 10 is applied to a broadband antenna. The impedance Z 1 shown in FIG. 3 represents one antenna load impedance of the broadband antenna, and the impedance Z 2 represents the system impedance. The present invention is not particularly limited to the shape or kind of the wideband antenna to which it is applied, and it may be, for example, a planar antenna. The above-mentioned "broadband" means that the impedance matching circuit 10 of the present embodiment can select and adjust two or more frequency bands within the bandwidth of the wideband antenna, that is, it is sufficient for the above-mentioned broadband meaning. The broadband antenna has a feed end, and the impedance matching circuit 10 is electrically coupled to the feed end. The electrical coupling between the two is represented by the node N1.
另外，阻抗匹配電路10可包含2個以上之電路分支，於此係以電路分支11、12為例。電路分支11、12係彼此並聯，各電路分支11、12包含一可調電感性單元111、121以及一頻率選擇單元112、122。其中，可調電感性單元111與頻率選擇單元112係串聯，可調電感性單元121與頻率選擇單元122係串聯。In addition, the impedance matching circuit 10 may include two or more circuit branches, and the circuit branches 11, 12 are taken as an example. The circuit branches 11, 12 are connected in parallel with each other, and each of the circuit branches 11, 12 includes a tunable inductive unit 111, 121 and a frequency selecting unit 112, 122. The adjustable inductive unit 111 is connected in series with the frequency selecting unit 112, and the adjustable inductive unit 121 is connected in series with the frequency selecting unit 122.
於此，可調電感性單元111、121分別包含一電感器與一可調電容器，藉由調整可調電容器之電容值，可達到此電路分支11、12之電感可調。另外，可調電感性單元111、121之電感器分別為控制匹配低、高頻操作頻帶之用。Here, the adjustable inductive units 111 and 121 respectively comprise an inductor and an adjustable capacitor, and the inductance of the circuit branches 11 and 12 can be adjusted by adjusting the capacitance value of the adjustable capacitor. In addition, the inductors of the adjustable inductive units 111 and 121 are respectively used for controlling the low matching and high frequency operating frequency bands.
頻率選擇單元112、122例如為一濾波元件。於此，頻率選擇單元112包含一電感器，其可隔離高頻訊號，使電路分支11具有較低頻之操作頻段；頻率選擇單元122包含一電容器，其可隔離低頻訊號，使電路分支12具有較高頻之操作頻段。The frequency selection unit 112, 122 is, for example, a filter element. Here, the frequency selecting unit 112 includes an inductor that can isolate the high frequency signal so that the circuit branch 11 has a lower frequency operating frequency band; the frequency selecting unit 122 includes a capacitor that can isolate the low frequency signal so that the circuit branch 12 has Higher frequency operating band.
總括來說，藉由頻率選擇單元112、122可達到多頻效果(如低頻、高頻)，並且藉由調整可調電感性單元111、121之等效電感值，而能達到各頻段可調之效果。上述僅是說明各單元之主要功能，在實際上，頻率選擇單元與可調電感性單元在電路上的表現是會互相影響。In summary, the frequency selection unit 112, 122 can achieve multi-frequency effects (such as low frequency, high frequency), and by adjusting the equivalent inductance values of the adjustable inductive units 111, 121, the frequency bands can be adjusted. The effect. The above is only to explain the main functions of each unit. In fact, the performance of the frequency selection unit and the adjustable inductive unit on the circuit will affect each other.
另外，阻抗匹配電路10更包含一電容單元13，其分別與該等電路分支11、12及寬頻天線之一天線負載阻抗Z1電性連接。於此，電容單元13包含一電容器C1。阻抗匹配電路10更包含一電容單元14，其分別與該等電路分支11、12及一系統阻抗Z2電性連接。於此，電容單元14包含一電容器C2。藉由電容單元13、14，可將阻抗轉換至史密斯圖(Smith chart)的右端極點與拉回中心，藉由電容單元13、14可改變所需的頻寬。另外需說明的是，電容單元與可調電感性單元以及頻率選擇單元在電路上的表現是會互相影響。In addition, the impedance matching circuit 10 further includes a capacitor unit 13 electrically connected to the circuit branches 11, 12 and one of the antenna antenna load impedances Z 1 , respectively. Here, the capacitor unit 13 includes a capacitor C 1 . The impedance matching circuit 10 further includes a capacitor unit 14 electrically connected to the circuit branches 11, 12 and a system impedance Z 2 , respectively. Here, the capacitor unit 14 includes a capacitor C 2 . By means of the capacitor units 13, 14, the impedance can be converted to the right end pole and the pull back center of the Smith chart, and the required bandwidth can be changed by the capacitor units 13, 14. In addition, it should be noted that the performance of the capacitor unit and the adjustable inductive unit and the frequency selecting unit on the circuit will affect each other.
藉由上述阻抗匹配電路10，本實施例之可調天線裝置可達到多頻且各頻可調之功能。圖4與圖5分別為本實施例之天線裝置之工作頻率與反射損失的示意圖，其中圖4係改變可調電感性單元121之可調電容器之偏壓，圖5係改變可調電感性單元111之可調電容器之偏壓。With the impedance matching circuit 10 described above, the tunable antenna device of the present embodiment can achieve multi-frequency and adjustable frequency functions. 4 and FIG. 5 are respectively schematic diagrams showing the operating frequency and reflection loss of the antenna device of the present embodiment, wherein FIG. 4 is a change of the bias voltage of the adjustable capacitor of the adjustable inductive unit 121, and FIG. 5 is a change of the adjustable inductive unit. The bias voltage of the adjustable capacitor of 111.
如圖4所示，在將可調電感性單元121之可調電容器之偏壓改變為0V、5V、11V、23V的情況下，天線裝置達到高頻頻段可調的效果。在圖4中，可調電感性單元111之可調電容器之偏壓係以固定在5.9V為例。圖4驗證本實施例之天線裝置可實際應用於各種通訊標準，並達到多頻、且各頻段可調。As shown in FIG. 4, in the case where the bias voltage of the adjustable capacitor of the adjustable inductive unit 121 is changed to 0V, 5V, 11V, 23V, the antenna device achieves the effect of adjusting the high frequency band. In FIG. 4, the bias voltage of the adjustable capacitor of the adjustable inductive unit 111 is exemplified by being fixed at 5.9V. FIG. 4 verifies that the antenna device of the embodiment can be practically applied to various communication standards, and achieves multiple frequencies, and each frequency band is adjustable.
如圖5所示，在將可調電感性單元111之可調電容器之偏壓改變為0V、5V、11V、23V的情況下，天線裝置達到低頻頻段可調的效果。在圖5中，可調電感性單元121之可調電容器之偏壓係以固定在10.7V為例。圖5驗證本實施例之天線裝置可實際應用於各種通訊標準，並達到多頻、且各頻段可調。上述僅使用一些偏壓來作為例子，一旦使偏壓為連續改變的情況下，可使各頻段達到連續可調的狀態。As shown in FIG. 5, in the case where the bias voltage of the adjustable capacitor of the adjustable inductive unit 111 is changed to 0V, 5V, 11V, 23V, the antenna device achieves the effect of adjusting the low frequency band. In FIG. 5, the bias voltage of the adjustable capacitor of the adjustable inductive unit 121 is exemplified by being fixed at 10.7V. FIG. 5 verifies that the antenna device of the embodiment can be practically applied to various communication standards, and achieves multiple frequencies, and each frequency band is adjustable. The above uses only some bias voltages as an example, and once the bias voltage is continuously changed, the frequency bands can be brought to a continuously adjustable state.
綜合圖4與圖5之技術手段，可使天線裝置達到高頻、低頻之獨立可調(independently tunable)，並且為連續可調(continuously tunable)。Combining the technical means of FIG. 4 and FIG. 5, the antenna device can be independently tunable to be high frequency and low frequency, and is continuously tunable.
本發明之阻抗匹配電路可包含2個以上之電路分支，以下再以3個電路分支作例說明。The impedance matching circuit of the present invention may include more than two circuit branches, and the following three circuit branches are exemplified.
圖6為本發明較佳實施例之另一種可調天線裝置2及其阻抗匹配電路20的示意圖。阻抗匹配電路20係應用於一寬頻天線，圖6所示之阻抗Z3係代表寬頻天線之一天線負載阻抗，而阻抗Z4係代表系統阻抗。寬頻天線具有一饋入端，阻抗匹配電路20與饋入端電性耦接，此二者之電性耦接係由節點N2表示。FIG. 6 is a schematic diagram of another tunable antenna device 2 and its impedance matching circuit 20 in accordance with a preferred embodiment of the present invention. The impedance matching circuit 20 is applied to a wideband antenna system, the impedance Z 3 shown in FIG. 6 of the broadband antenna system representative of one of the antenna load impedance and line impedance Z 4 represents the system impedance. The broadband antenna has a feed end, and the impedance matching circuit 20 is electrically coupled to the feed end. The electrical coupling between the two is represented by the node N2.
阻抗匹配電路20包含電路分支21、22、23為例。電路分支21、22、23係彼此並聯，各電路分支21、22、23包含一可調電感性單元211、221、231以及一頻率選擇單元212、222、232。其中，可調電感性單元211與頻率選擇單元212係串聯，可調電感性單元221與頻率選擇單元222係串聯，可調電感性單元231與頻率選擇單元232係串聯。The impedance matching circuit 20 includes circuit branches 21, 22, and 23 as an example. The circuit branches 21, 22, 23 are connected in parallel with each other, and each of the circuit branches 21, 22, 23 includes a tunable inductive unit 211, 221, 231 and a frequency selecting unit 212, 222, 232. The adjustable inductive unit 211 is connected in series with the frequency selecting unit 212, the adjustable inductive unit 221 is connected in series with the frequency selecting unit 222, and the adjustable inductive unit 231 is connected in series with the frequency selecting unit 232.
於此，可調電感性單元211、221、231分別包含一電感器與一可調電容器，藉由調整可調電容器之電容值，可達到此電路分支21、22、23之電感可調。另外，可調電感性單元211、221、231之電感器分別為控制匹配低、高、中頻操作頻帶之用。Here, the adjustable inductive units 211, 221, and 231 respectively include an inductor and an adjustable capacitor, and the inductance of the circuit branches 21, 22, and 23 can be adjusted by adjusting the capacitance of the adjustable capacitor. In addition, the inductors of the adjustable inductive units 211, 221, and 231 are respectively used for controlling the matching of the low, high, and intermediate frequency operating bands.
頻率選擇單元212、222、232例如為一濾波元件。於此，頻率選擇單元212包含一電感器，其可隔離高頻訊號，使電路分支21具有較低頻之操作頻段；頻率選擇單元222包含一電容器，其可隔離低頻訊號，使電路分支22具有較高頻之操作頻段；頻率選擇單元232包含一電容器，其可隔離低頻訊號，使電路分支23具有較中頻之操作頻段。雖然頻率選擇單元222皆包含電容器，但搭配不同之可調電感性單元之電感器之值，可分別得到高頻段與中頻段之效果。於此，可調電感性單元231之電感器之值大於可調電感性單元221之電感器之值。The frequency selection unit 212, 222, 232 is, for example, a filter element. Here, the frequency selecting unit 212 includes an inductor that can isolate the high frequency signal so that the circuit branch 21 has a lower frequency operating frequency band; the frequency selecting unit 222 includes a capacitor that can isolate the low frequency signal so that the circuit branch 22 has The higher frequency operating frequency band; the frequency selecting unit 232 includes a capacitor that isolates the low frequency signal such that the circuit branch 23 has a higher frequency operating frequency band. Although the frequency selection unit 222 includes capacitors, the effects of the high frequency band and the medium frequency band can be obtained by using the values of the inductors of different adjustable inductive units. Here, the value of the inductor of the adjustable inductive unit 231 is greater than the value of the inductor of the adjustable inductive unit 221 .
總括來說，藉由頻率選擇單元212、222、223可達到多頻效果(如低頻、高頻、中頻)，並且藉由調整可調電感性單元211、221、231之等效電感值，而能達到各頻段可調之效果。In summary, multi-frequency effects (such as low frequency, high frequency, intermediate frequency) can be achieved by the frequency selecting units 212, 222, 223, and by adjusting the equivalent inductance values of the adjustable inductive units 211, 221, 231, And can achieve the effect of adjustable frequency bands.
另外，阻抗匹配電路20更包含一電容單元24，其分別與該等電路分支21、22、23及寬頻天線之一天線負載阻抗Z3電性連接。於此，電容單元24包含一電容器C3。阻抗匹配電路20更包含一電容單元25，其分別與該等電路分支21、22、23及一系統阻抗Z4電性連接。於此，電容單元25包含一電容器C4。藉由電容單元24、25，可將阻抗轉換至史密斯圖(Smith chart)的右端極點與拉回中心。藉由電容單元24、25可改變所需的頻寬。In addition, the impedance matching circuit 20 further includes a capacitor unit 24 electrically connected to the circuit branches 21, 22, 23 and one of the broadband antenna antenna load impedances Z 3 , respectively. Here, the capacitor unit 24 includes a capacitor C 3 . The impedance matching circuit 20 further includes a capacitor unit 25 electrically connected to the circuit branches 21, 22, 23 and a system impedance Z 4 , respectively. Here, the capacitor unit 25 includes a capacitor C 4 . With the capacitor units 24, 25, the impedance can be converted to the right end of the Smith chart and the center of the pull back. The required bandwidth can be changed by the capacitor units 24, 25.
藉由上述阻抗匹配電路20，本實施例之天線裝置可達到多頻且各頻可調之功能。圖7、圖8、圖9分別為本實施例之天線裝置之工作頻率與反射損失的示意圖，其中圖7係改變可調電感性單元221之可調電容器之偏壓，圖8係改變可調電感性單元211之可調電容器之偏壓，圖9係改變可調電感性單元231之可調電容器之偏壓。With the impedance matching circuit 20 described above, the antenna device of the present embodiment can achieve multi-frequency and adjustable frequency functions. 7 , FIG. 8 and FIG. 9 are respectively schematic diagrams showing the operating frequency and reflection loss of the antenna device of the present embodiment, wherein FIG. 7 is a change of the bias voltage of the adjustable capacitor of the adjustable inductive unit 221, and FIG. 8 is adjustable. The bias voltage of the adjustable capacitor of the inductive unit 211, FIG. 9 is the bias voltage of the adjustable capacitor of the adjustable inductive unit 231.
如圖7所示，在將可調電感性單元221之可調電容器之電容值改變為0.3PF、0.05PF、0.03PF、0.01PF的情況下，天線裝置達到高頻頻段可調的效果。在圖7中，可調電感性單元211之可調電容器之電容值係以固定在2PF，而可調電感性單元231之可調電容器之電容值係以固定在0.5PF為例。圖7驗證本實施例之天線裝置可實際應用於各種通訊標準，並達到多頻、且各頻段可調。As shown in FIG. 7, in the case where the capacitance value of the adjustable capacitor of the adjustable inductive unit 221 is changed to 0.3 PF, 0.05 PF, 0.03 PF, and 0.01 PF, the antenna device achieves an effect of adjusting the high frequency band. In FIG. 7, the capacitance value of the adjustable capacitor of the adjustable inductive unit 211 is fixed at 2 PF, and the capacitance value of the adjustable capacitor of the adjustable inductive unit 231 is fixed at 0.5 PF as an example. FIG. 7 verifies that the antenna device of the embodiment can be practically applied to various communication standards, and achieves multiple frequencies, and each frequency band is adjustable.
如圖8所示，在將可調電感性單元211之可調電容器之電容值改變為2PF、0.1PF、0.05PF、0.02PF的情況下，天線裝置達到低頻頻段可調的效果。在圖8中，可調電感性單元231之可調電容器之電容值係以固定在0.02PF，而可調電感性單元221之可調電容器之電容值係以固定在0.02PF為例。圖8驗證本實施例之天線裝置可實際應用於各種通訊標準，並達到多頻、且各頻段可調。As shown in FIG. 8, in the case where the capacitance value of the adjustable capacitor of the adjustable inductive unit 211 is changed to 2PF, 0.1PF, 0.05PF, 0.02PF, the antenna device achieves the effect of adjusting the low frequency band. In FIG. 8, the capacitance value of the adjustable capacitor of the adjustable inductive unit 231 is fixed at 0.02 PF, and the capacitance value of the adjustable capacitor of the adjustable inductive unit 221 is fixed at 0.02 PF as an example. FIG. 8 verifies that the antenna device of the embodiment can be practically applied to various communication standards, and achieves multiple frequencies, and each frequency band is adjustable.
如圖9所示，在將可調電感性單元231之可調電容器之電容值改變為0.5PF、0.1PF、0.02PF、0.01PF的情況下，天線裝置達到中頻頻段可調的效果。在圖9中，可調電感性單元211之可調電容器之電容值係以固定在2PF，而可調電感性單元221之可調電容器之電容值係以固定在0.01PF為例。圖9驗證本實施例之天線裝置可實際應用於各種通訊標準，並達到多頻、且各頻段可調。綜合圖7、圖8、圖9之技術手段，可使本實施例之天線裝置達到高頻、中頻、低頻之獨立可調，並且為連續可調。As shown in FIG. 9, when the capacitance value of the adjustable capacitor of the adjustable inductive unit 231 is changed to 0.5 PF, 0.1 PF, 0.02 PF, and 0.01 PF, the antenna device achieves an effect that the intermediate frequency band is adjustable. In FIG. 9, the capacitance value of the adjustable capacitor of the adjustable inductive unit 211 is fixed at 2 PF, and the capacitance value of the adjustable capacitor of the adjustable inductive unit 221 is fixed at 0.01 PF as an example. FIG. 9 verifies that the antenna device of the embodiment can be practically applied to various communication standards, and achieves multiple frequencies, and each frequency band is adjustable. According to the technical means of FIG. 7, FIG. 8, and FIG. 9, the antenna device of the embodiment can be independently adjusted to high frequency, intermediate frequency and low frequency, and is continuously adjustable.
隨著本發明之阻抗匹配電路所包含之電路分支越多，可從寬頻天線之頻寬選擇出來之頻段數量也越多，並且可達到各頻段獨立可調以及連續可調。As the impedance matching circuit of the present invention includes more circuit branches, the number of frequency bands that can be selected from the bandwidth of the wideband antenna is larger, and the frequency bands can be independently adjustable and continuously adjustable.
綜上所述，經過本發明之努力研究及探討，發現到一種阻抗匹配電路能夠達到多頻、各頻段可調的效果。該阻抗匹配電路包含複數電路分支，該等電路分支係彼此並聯，並各包含一可調電感性單元以及一頻率選擇單元。其中，可調電感性單元係可調。藉由頻率選擇單元可達到多頻效果(如低頻、中頻、高頻)，並且藉由調整可調電感性單元之等效電感值，而能達到各頻段獨立可調以及連續可調之效果。因此，本發明能夠大幅提升天線效能與產品競爭力。In summary, through the efforts and research of the present invention, it has been found that an impedance matching circuit can achieve the effects of multi-frequency and adjustable frequency bands. The impedance matching circuit includes a plurality of circuit branches that are connected in parallel with each other and each include a tunable inductive unit and a frequency selecting unit. Among them, the adjustable inductive unit is adjustable. Multi-frequency effects (such as low frequency, intermediate frequency, high frequency) can be achieved by the frequency selection unit, and by adjusting the equivalent inductance value of the adjustable inductive unit, the frequency band can be independently adjusted and continuously adjustable. . Therefore, the present invention can greatly improve antenna performance and product competitiveness.
以上所述僅為舉例性，而非為限制性者。任何未脫離本發明之精神與範疇，而對其進行之等效修改或變更，均應包含於後附之申請專利範圍中。The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims.
1、2．．．可調天線裝置1, 2. . . Adjustable antenna device
10、20．．．阻抗匹配電路10, 20. . . Impedance matching circuit
11、12、21、22、23．．．電路分支11, 12, 21, 22, 23. . . Circuit branch
111、121、211、221、231．．．可調電感性單元111, 121, 211, 221, 231. . . Adjustable inductive unit
112、122、212、222、232．．．頻率選擇單元112, 122, 212, 222, 232. . . Frequency selection unit
13、14、24、25．．．電容單元13, 14, 24, 25. . . Capacitor unit
C1、C2、C3、C4．．．電容器C 1 , C 2 , C 3 , C 4 . . . Capacitor
N1、N2．．．節點N1, N2. . . node
Z1、Z2、Z3、Z4．．．阻抗Z 1 , Z 2 , Z 3 , Z 4 . . . impedance
圖1與圖2為習知之多頻天線的示意圖；1 and 2 are schematic views of a conventional multi-frequency antenna;
圖3為本發明較佳實施例之一種可調天線裝置及其阻抗匹配電路的示意圖；3 is a schematic diagram of a tunable antenna device and an impedance matching circuit thereof according to a preferred embodiment of the present invention;
圖4與圖5分別為本發明較佳實施例之天線裝置之工作頻率與反射損失的示意圖；4 and FIG. 5 are schematic diagrams showing the operating frequency and reflection loss of an antenna device according to a preferred embodiment of the present invention;
圖6為本發明較佳實施例之另一種天線裝置及其阻抗匹配電路的示意圖；以及6 is a schematic diagram of another antenna device and an impedance matching circuit thereof according to a preferred embodiment of the present invention;
圖7至圖9分別為本發明較佳實施例之另一種天線裝置之工作頻率與反射損失的示意圖。7 to 9 are schematic diagrams showing the operating frequency and reflection loss of another antenna device according to a preferred embodiment of the present invention.
1．．．可調天線裝置1. . . Adjustable antenna device
10．．．阻抗匹配電路10. . . Impedance matching circuit
11、12．．．電路分支11,12. . . Circuit branch
111、121．．．可調電感性單元111, 121. . . Adjustable inductive unit
112、122．．．頻率選擇單元112, 122. . . Frequency selection unit
13、14．．．電容單元13, 14. . . Capacitor unit
C1、C2．．．電容器C 1 , C 2 . . . Capacitor
N1．．．節點N1. . . node
Z1、Z2．．．阻抗Z 1 , Z 2 . . . impedance
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW100129428A TWI518997B (en) | 2011-08-17 | 2011-08-17 | Impedance matching circuit and tunable antenna apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW100129428A TWI518997B (en) | 2011-08-17 | 2011-08-17 | Impedance matching circuit and tunable antenna apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| TW201310772A true TW201310772A (en) | 2013-03-01 |
| TWI518997B TWI518997B (en) | 2016-01-21 |
Family
ID=48482103
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| TW100129428A TWI518997B (en) | 2011-08-17 | 2011-08-17 | Impedance matching circuit and tunable antenna apparatus |
Country Status (1)
| Country | Link |
|---|---|
| TW (1) | TWI518997B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103794871A (en) * | 2014-01-23 | 2014-05-14 | 华为终端有限公司 | Antenna system and terminal |
| CN103856271A (en) * | 2014-02-25 | 2014-06-11 | 络达科技股份有限公司 | Adjustable harmonic wave filtering device |
| US9705468B2 (en) | 2014-02-25 | 2017-07-11 | Airoha Technology Corp. | Adjustable harmonic filtering device |
-
2011
- 2011-08-17 TW TW100129428A patent/TWI518997B/en not_active IP Right Cessation
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103794871A (en) * | 2014-01-23 | 2014-05-14 | 华为终端有限公司 | Antenna system and terminal |
| US10411354B2 (en) | 2014-01-23 | 2019-09-10 | Huawei Device Co., Ltd. | Antenna system and terminal |
| CN110299618A (en) * | 2014-01-23 | 2019-10-01 | 华为终端有限公司 | A kind of antenna system and terminal |
| US11949172B2 (en) | 2014-01-23 | 2024-04-02 | Honor Device Co., Ltd. | Antenna system and terminal |
| CN103856271A (en) * | 2014-02-25 | 2014-06-11 | 络达科技股份有限公司 | Adjustable harmonic wave filtering device |
| CN103856271B (en) * | 2014-02-25 | 2016-08-17 | 络达科技股份有限公司 | Adjustable harmonic filter |
| US9705468B2 (en) | 2014-02-25 | 2017-07-11 | Airoha Technology Corp. | Adjustable harmonic filtering device |
Also Published As
| Publication number | Publication date |
|---|---|
| TWI518997B (en) | 2016-01-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10249426B2 (en) | Tunable inductor arrangement, transceiver, method and computer program | |
| US20140306855A1 (en) | Tunable multiband antenna | |
| JP6075510B2 (en) | Antenna matching circuit, antenna matching module, antenna device, and wireless communication device | |
| CN104377444B (en) | A kind of mobile terminal broad-band antenna carrying out impedance matching using tunable capacitor | |
| US10283864B2 (en) | Antenna and terminal | |
| WO2015109943A1 (en) | Antenna system and terminal | |
| JPWO2017022370A1 (en) | Antenna matching circuit, antenna circuit, front end circuit, and communication device | |
| US20140342681A1 (en) | Providing Multiple Inductors For A Radio Tuner | |
| US9236657B2 (en) | Antenna device and matching circuit module for antenna device | |
| CN103904433A (en) | Tunable multi-band antenna and wireless communication device | |
| JP2012160817A (en) | Antenna and wireless communication device | |
| WO2009156564A1 (en) | An antenna arrangement | |
| US20230216196A1 (en) | Multi-band antenna and mobile terminal | |
| TWI594589B (en) | Rf matching circuit and wireless communication device using same | |
| TWI518997B (en) | Impedance matching circuit and tunable antenna apparatus | |
| CN104184488A (en) | Radio frequency matching circuit and wireless communication apparatus | |
| US9455686B1 (en) | Wireless communication device and tunable filter thereof | |
| CN105099479A (en) | Radio-frequency front-end circuit of multi-mode intelligent terminal receiver | |
| US10056936B2 (en) | Front end circuit and communication apparatus | |
| JP6228258B2 (en) | Portable electronic devices | |
| CN114069227B (en) | Multiband antenna |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MM4A | Annulment or lapse of patent due to non-payment of fees |