TWI425713B - 諧振產生之三頻段天線 - Google Patents
諧振產生之三頻段天線 Download PDFInfo
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- TWI425713B TWI425713B TW099104729A TW99104729A TWI425713B TW I425713 B TWI425713 B TW I425713B TW 099104729 A TW099104729 A TW 099104729A TW 99104729 A TW99104729 A TW 99104729A TW I425713 B TWI425713 B TW I425713B
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- 230000003071 parasitic effect Effects 0.000 claims description 16
- 239000000758 substrate Substances 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 2
- 238000009825 accumulation Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 16
- 230000005855 radiation Effects 0.000 description 5
- 230000001965 increasing effect Effects 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
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- 230000001939 inductive effect Effects 0.000 description 1
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- 238000005259 measurement Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2258—Supports; Mounting means by structural association with other equipment or articles used with computer equipment
- H01Q1/2266—Supports; Mounting means by structural association with other equipment or articles used with computer equipment disposed inside the computer
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/378—Combination of fed elements with parasitic elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
- H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength
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Description
本發明係關於一種諧振產生之三頻段天線,尤指一種不需增加天線尺寸即可同時於三個不同頻段內發射及接收訊號的三頻段天線。
近年來,具無線通訊功能的電子裝置日益普遍,各種通訊協定一一被制訂,許多無線通訊的頻段開放,因此內建於例如筆記型電腦等之電子裝置中的天線,其操作頻段須涵蓋多個不同的工作頻段以符合不同無線通訊網路所需。
平面倒F式天線(Planar Inverted-F Antenna,PIFA)由於結構簡單、製作方便、易整合、低姿態(Low Profile)、效能佳、體積小等優點,因此被廣泛應用於可攜式電子裝置中。請參照圖1,圖1係習知之具有一工作頻段之平面倒F式天線之示意圖,如圖1所示,平面倒F式天線1包括輻射部11、接地部12、饋入部13、接地元件14、以及饋入元件15,其中接地部12係連接至接地元件14,饋入部13係連接至饋入元件15以進行饋入,饋入部13較佳係為一同軸電纜且其外圍之接地層131係連接至接地元件14;其中,輻射部11的長度L11需為欲振出的工作頻段的中心頻率之四分之一波長或其倍數。
習知技術中,天線中的輻射元件數目係隨著所欲得出的工作頻段的數目而增加,即,雙頻段天線需具有兩個輻射元件,而具有三個工作頻段的天線必須有三個輻射元件以分別振出三個工作頻段,因此適用於多工作頻段的無線通訊電子裝置,由於其內建的多頻段天線體積龐大,而無法迎合消費者對可攜式電子產品輕薄短小的期待。
鑒於上述習知的三頻段天線尚有改進空間,本發明之一目的,係提供一種在不增加天線尺寸的情況下,以兩輻射元件可諧振產生出三個工作頻段之三頻段天線。
依據本發明之一特色,本發明係提出一種諧振產生之三頻段天線,其包括:一絕緣介質層,具有一第一表面以及一第二表面;一第一輻射元件,係設置於第一表面,用以諧振第一工作頻段,其係具有第一中心頻率,第一輻射元件上設置有一饋入部以及一接地部;一第二輻射元件,係用以與第一輻射元件諧振出第二工作頻段,其係具有第二中心頻率,且第二中心頻率係大於第一中心頻率,第二輻射元件設置於第二表面,其係隔著絕緣介質層疊合至第一輻射元件下方,而與第一輻射元件之間產生一寄生電容;一饋入元件,係連接至饋入部以進行饋入;以及一接地元件,係與接地部相連;其中,第一輻射元件與第二輻射元件之寄生電容與第二輻射元件之寄生電感諧振產生第三工作頻段,其係具有第三中心頻率,且第三中心頻率係大於第二中心頻率。
請參照圖2A及圖2B,圖2A及圖2B係分別為本發明一較佳實施例之三頻段天線2之第一表面211及第二表面212之立體圖,三頻段天線2包括:絕緣介質層21、接地元件22、第一輻射元件23、第二輻射元件24、以及饋入元件25,其中絕緣介質層21係由不導電材料所構成,可為一印刷電路板基板、或空氣,較佳係為一FR4材質的矩形印刷電路板基板,而接地元件22、第一輻射元件23、以及第二輻射元件24較佳係為薄層金屬。
絕緣介質層21具有第一表面211以及第二表面212,第一輻射元件23設置於第一表面211,其上設置有饋入部231以及接地部232,接地部232較佳係與接地元件22相連;第二輻射元件24設置於第二表面212,且第二輻射元件24係隔著絕緣介質層21疊合至第一輻射元件23下方,而與第一輻射元件23之間產生一寄生電容;饋入元件25連接至饋入部231以進行饋入;在本實施例中,接地元件22係設置於第一表面211,但不侷限於設置於第一表面211,其亦可設置於第二表面212並以導線連接至接地部232,饋入元件25係為一同軸電纜251,且其外圍之接地層233係連接至接地部232。
如圖2A及圖2B所示,第一輻射元件23係為一蜿蜒線(Meander-line)狀區塊,其具有一缺口長度S;第二輻射元件24較佳係為一L型區塊,其具有長邊241、以及短邊242,其中長邊241較佳係切齊於第一輻射元件23的邊緣,短邊242的長度較佳係相同於第一輻射元件23的缺口長度S,以與第一輻射元件23之間產生寄生電容。
第一輻射元件23的總長度L23較佳係為頻率為第一中心頻率f1的電磁波的四分之一波長或其倍數,以諧振第一工作頻段BWf1
,其係具有第一中心頻率f1;第二輻射元件24的總長度L24較佳係為頻率為第二中心頻率f2的電磁波的四分之一波長或其倍數,以與第一輻射元件23諧振出第二工作頻段BWf2
,其係具有第二中心頻率f2;且第一輻射元件23與第二輻射元件24的寄生電容與第二輻射元件24的寄生電感諧振產生第三工作頻段BWf3
,其係具有第三中心頻率f3;其中,第二中心頻率f2大於第一中心頻率f1,且第三中心頻率f3大於第二中心頻率f2。
因此,若欲調整本發明之三頻段天線2的三個頻段BWf1
、BWf2
以及BWf3
,由於第一輻射元件23的總長度較佳係為頻率
為第一中心頻率f1的電磁波的四分之一波長或其倍數,因此對第一輻射元件23的尺寸進行調整可決定三頻段天線2的第一工作頻段BWf1
;而由於第二工作頻段BWf2
及第三工作頻段BWf3
係由第二輻射元件24分別與第一輻射元件23及寄生電容諧振所產生,因此可由調整第二輻射元件24的形狀大小來微調第二工作頻段BWf2
、第三工作頻段BWf3
以及阻抗匹配,最後再對接地元件22的大小進行微調以最佳化匹配。
請參照圖3,圖3係本發明一較佳實施例之三頻段天線2之第二輻射元件24在高頻電磁波感應的情況下之阻抗變化圖。由於第二輻射元件24的阻抗等效於串接一電容以及一電感,在低頻的情況下,其電容及電感的特性並不明顯,但在高頻電磁波感應於第二輻射元件24上的情況下,若高頻電磁波的頻率小於3.5GHz,則第二輻射元件24會表現出電容特性,稱作寄生電容,而若其頻率大於3.5GHz,則第二輻射元件24會表現出電感特性,稱作寄生電感。
請參照圖4,圖4係本發明一較佳實施例之三頻段天線2之反射損耗頻率響應圖,其係為實際量測而得。在本實施例中,絕緣介質層21為一FR4材質的矩形印刷電路板基板,其介電係數為4,尺寸為長22mm、寬9mm、厚度0.4mm,接地元件22、第一輻射元件23以及第二輻射元件24均為厚度0.02mm的銅箔。由圖4可知,三頻段天線2的第一工作頻段BWf1
係為2.2GHz至2.8GHz,第一中心頻率f1為2.5GHz,第二工作頻段BWf2
為3GHz至4GHz,第二中心頻率f2為3.5GHz,第三工作頻段BWf3
為4.2GHz至6GHz,第三中心頻率f3為5GHz,因此本發明之三頻段天線可分別滿足Wi-Fi及WiMAX所需的2GHz頻段、WiMAX所需的3GHz頻段、以及802.11a及WiMAX所需的5GHz頻段,即目前無線區域網路以及WiMAX的所有頻段。
請同時參照圖2A以及圖5,圖5係本發明一較佳實施例之三頻段天線2以同軸電纜(coaxial cable)方式饋入之方塊圖。本發明之三頻段天線2係以同軸電纜251連接至無線模組51,其較佳係以連接器或焊接連接;同軸電纜251的一端係連接至三頻段天線2的饋入部231,且其接地層233係連接至三頻段天線2的接地部22以最佳化阻抗匹配,同軸電纜251的另一端連接至無線模組51;無線模組51係透過供電介面由電源晶片52供電,並透過實體傳輸介面與系統的南橋/介面控制晶片53相連接以傳輸資料。以本方式進行饋入可應用於筆記型電腦中,請參照圖6,圖6係將本發明一較佳實施例之三頻段天線2設置於筆記型電腦6中之示意圖,本發明之三頻段天線2係設置於顯示面板61上方,並透過同軸電纜251連接至無線模組62,而接地元件22較佳係連接至筆記型電腦6的機殼接地以使匹配最佳化,應注意的是,三頻段天線2應避免接近例如揚聲器、震動馬達等之金屬物件,且其後方投影處不得使用金屬機殼,以避免屏蔽效應及確保其有最佳輻射效率。
除了以前述同軸電纜(coaxial cable)的方式進行饋入之外,本發明之三頻段天線2亦可以共面波導(co-plane waveguide)、微帶線(micro strip line)、以及彈針(pogo pin)等方式進行饋入。若以共面波導或微帶線方式進行饋入,可將本發明之三頻帶天線2直接設計於電子裝置的印刷電路板上,以印刷電路板上下表層的銅箔作為本發明之第一輻射元件23以及第二輻射元件24,並直接以印刷電路線於印刷電路板上的方式對第一輻射元件23進行饋入,如此,對製造廠商來說,本發明之三頻帶天線2除了不需增加額外的成本及體積,更可用於例如手機等之小型攜帶式電子裝置,以符合電子產品小型化之趨勢。請參照圖7A,圖7A係本發明一較佳實施例之以共面波
導(co-plane waveguide)的方式進行饋入之三頻段天線2之立體圖,其中絕緣介質層21的第一表面211上設置有接地元件22、第一輻射元件23、饋入元件25、以及匹配網路26,第二表面212上設置有第二輻射單元24;饋入元件25係為一饋入線252,其係以直接印刷電路線於第一表面211的方式形成,其一端連接至饋入部231,另一端係與圖9中所述的系統晶片91相連接;接地元件22係圍繞於饋入線252的兩側,且係與接地部232相連;匹配網路26係設置於饋入線252上,在本實施例中,匹配網路26包括被動元件261-263,其係可為電容或電感。
請參照圖7B,圖7B係本發明一較佳實施例之以共面波導(co-plane waveguide)的方式進行饋入之三頻段天線2之饋入線252之參考接地之示意圖,如圖7B所示,接地元件22位於饋入線252的兩側,因此饋入線252上的高速訊號係以接地元件22作為參考接地,以避免訊號干擾以及被干擾。
請同時參照圖8A與圖8B,圖8A係本發明一較佳實施例之以微帶線(micro strip line)的方式進行饋入之三頻段天線2之立體圖,圖8B係本發明一較佳實施例之以微帶線(micro strip line)的方式進行饋入之三頻段天線2之微帶線253之參考接地之示意圖。其中絕緣介質層21的第一表面211上設置有第一輻射元件23、饋入元件25、以及匹配網路26,第二表面212上設置有接地元件22、以及第二輻射單元24,第一輻射元件23的接地部232較佳係以過孔線255連接至接地元件22;饋入元件25係為一微帶線253,其係以印刷電路線於第一表面211的方式連接至饋入部231,接地元件22係隔著絕緣介質層21位於微帶線253的下方,微帶線253上的高速訊號係以接地元件22作為參考的接地面,以避免訊號干擾及被干擾;匹配網路26較佳係設置於微帶
線253上,在本實施例中,匹配網路26包括被動元件261-263,其係分別可為電容或電感,被動元件263的接地腳係經過孔線255連接至接地元件22。
請參照圖9,圖9係於本發明一較佳實施例之三頻段天線2設置匹配網路26之方塊圖,其可應用於上述以共面波導以及微帶線方式進行饋入之三頻段天線2,係於饋入元件25上設置匹配網路26以對三頻段天線2的第一工作頻段BWf1
、第二工作頻段BWf2
以及第三工作頻段BWf3
進行微調,其中匹配網路26較佳係包括至少一被動元件,其係用以依匹配情況進行適當調整;三頻段天線2經饋入元件25連接至系統晶片91,系統晶片91係透過供電介面由電源晶片92供電,並透過實體傳輸介面與系統的南橋/介面控制晶片93相連接。
請參照圖10,圖10係本發明一較佳實施例之以彈針(pogo pin)的方式進行饋入之三頻段天線2之立體圖,其係以彈針254連接至第一輻射元件23的饋入部231,以由饋入元件25引出訊號;在本實施例中,絕緣介質層21係為空氣,在此空氣層之兩邊即相當於絕緣介質層21的第一表面211以及第二表面212,第一輻射元件23的接地部232係連接至印刷電路板上的接地元件,或連接至裝置有該三頻段天線2之電子裝置中其他大面積的接地面,而第二輻射元件24係貼附於任何非金屬材料上,第一輻射元件23與第二輻射元件24之間的間距t係依所欲諧振出的工作頻段進行調整。
請參照圖11,圖11係本發明一較佳實施例之三頻段天線2之第二輻射元件24之示意圖,如圖11所示,本發明之三頻段天線2並未對第二輻射元件24的形狀進行限定,但應注意的是,第二輻射元件24的總長度L24需為頻率為第二中心頻率f2的電
磁波的四分之一波長或其倍數,並可由調整第二輻射元件24的形狀對三頻段天線2的工作頻段進行微調。
綜上所述,本發明之三頻段天線係於習知的平面倒F式天線後方放置一金屬片以使其耦合而產生新的諧振點,即,以兩個輻射元件振出三個工作頻段,因此本發明之三頻段天線可於不增加天線尺寸及成本的情況下新增兩個工作頻段,因而可提供一完整的天線配置以供多種無線通訊標準使用。再者,由於不增加天線尺寸及成本,因此本發明更適合設置於例如筆記型電腦、個人數位助理(Personal Digital Assistant,PDA)、或攜帶式行動電話等之攜帶式電子裝置內,以符合消費者對可攜式電子產品輕薄短小的期待。
上述實施例僅係為了方便說明而舉例而已,本發明所主張之權利範圍自應以申請專利範圍所述為準,而非僅限於上述實施例。
1‧‧‧平面倒F式天線
11‧‧‧輻射部
12‧‧‧接地部
13‧‧‧饋入部
131‧‧‧接地層
14‧‧‧接地元件
15‧‧‧饋入元件
2‧‧‧三頻段天線
21‧‧‧絕緣介質層
211‧‧‧第一表面
212‧‧‧第二表面
22‧‧‧接地元件
23‧‧‧第一輻射元件
231‧‧‧饋入部
232‧‧‧接地部
233‧‧‧接地層
24‧‧‧第二輻射元件
241‧‧‧長邊
242‧‧‧短邊
25‧‧‧饋入元件
251‧‧‧同軸電纜
252‧‧‧饋入線
253‧‧‧微帶線
254‧‧‧彈針
255‧‧‧過孔線
26‧‧‧匹配網路
261-263‧‧‧被動元件
51‧‧‧無線模組
52‧‧‧電源晶片
53‧‧‧南橋/介面控制晶片
6‧‧‧筆記型電腦
61‧‧‧顯示面板
62‧‧‧無線模組
91‧‧‧系統晶片
92‧‧‧電源晶片
93‧‧‧南橋/介面控制晶片
L11‧‧‧輻射部長度
L23‧‧‧第一輻射元件長度
L24‧‧‧第二輻射元件長度
S‧‧‧缺口長度
t‧‧‧間距
圖1係習知之具有一工作頻段之平面倒F式天線之示意圖。
圖2A係本發明一較佳實施例之三頻段天線之第一表面之立體圖。
圖2B係本發明一較佳實施例之三頻段天線之第二表面之立體圖。
圖3係本發明一較佳實施例之三頻段天線之第二輻射元件在高頻電磁波感應的情況下之阻抗變化圖。
圖4係本發明一較佳實施例之三頻段天線之反射損耗頻率響應圖。
圖5係本發明一較佳實施例之三頻段天線以同軸電纜方式饋入之方塊圖。
圖6係將本發明一較佳實施例之三頻段天線設置於筆記型電腦中之示意圖。
圖7A係本發明一較佳實施例之以共面波導的方式進行饋入之三頻段天線之立體圖。
圖7B係本發明一較佳實施例之以共面波導的方式進行饋入之三頻段天線之饋入線之參考接地之示意圖。
圖8A係本發明一較佳實施例之以微帶線的方式進行饋入之三頻段天線之立體圖。
圖8B係本發明一較佳實施例之以微帶線的方式進行饋入之三頻段天線之微帶線之參考接地之示意圖。
圖9係於本發明一較佳實施例之三頻段天線設置匹配網路之方塊圖。
圖10係本發明一較佳實施例之以彈針的方式進行饋入之三頻段天線之立體圖。
圖11係本發明一較佳實施例之三頻段天線之第二輻射元件之示意圖。
2‧‧‧三頻段天線
21‧‧‧絕緣介質層
211‧‧‧第一表面
22‧‧‧接地元件
23‧‧‧第一輻射元件
231‧‧‧饋入部
232‧‧‧接地部
233‧‧‧接地層
25‧‧‧饋入元件
251‧‧‧同軸電纜
L23‧‧‧第一輻射元件長度
S‧‧‧缺口長度
Claims (21)
- 一種諧振產生之三頻段天線,其包括:一絕緣介質層,具有一第一表面以及一第二表面;一第一輻射元件,係設置於該第一表面,用以諧振第一工作頻段,其係具有第一中心頻率,該第一輻射元件上設置有一饋入部以及一接地部;一第二輻射元件,係用以與該第一輻射元件諧振出第二工作頻段,其係具有第二中心頻率,且該第二中心頻率係大於該第一中心頻率,該第二輻射元件設置於該第二表面,其係隔著該絕緣介質層疊合至該第一輻射元件下方,而與該第一輻射元件之間產生一寄生電容;一饋入元件,係連接至該饋入部以進行饋入;以及一接地元件,係與該接地部相連;其中,該饋入元件為一饋入線且設置於該第一表面;該接地元件設置於該第二表面,係隔著該絶緣介質層位於該饋入元件下方,並以導線與該接地部相連;其中該第一輻射元件與第二輻射元件之間產生的寄生電容與該第二輻射元件之寄生電感諧振產生第三工作頻段,其係具有第三中心頻率,且該第三中心頻率係大於該第二中心頻率。
- 如申請專利範圍第1項所述之三頻段天線,其中該接地元件係設置於該第一表面,並直接與該接地部相接。
- 如申請專利範圍第1項所述之三頻段天線,其中該饋入元件係為一同軸電纜。
- 如申請專利範圍第1項所述之三頻段天線,其中該積入元件為一饋入線且設置於該第一表面;該接地元件係設置於該第一表面且圍繞於該饋入線之兩側。
- 如申請專利範圍第4項所述之三頻段天線,其更包括一匹配網路,其係包括至少一被動元件,用以對該第一工作頻段、該第二工作頻段以及該第三工作頻段進行調整。
- 如申請專利範圍第1項所述之三頻段天線,其更包括一匹配網路,其係包括至少一被動元件,用以對該第一工作頻段、該第二工作頻段以及該第三工作頻段進行調整。
- 如申請專利範圍第4項所述之三頻段天線,其中該饋入線係印刷電路板上之印刷電路線。
- 如申請專利範圍第1項所述之三頻段天線,其中該饋入元件係以彈針方式接觸該饋入部。
- 如申請專利範圍第1項所述之三頻段天線,其中該第二輻射元件係為一L型區塊。
- 如申請專利範圍第1項所述之三頻段天線,其中該第一輻射元件係為一蜿蜒線狀區塊。
- 如申請專利範圍第10項所述之三頻段天線,其中該第一輻射元件具有一缺口長度;該第二輻射元件具有一長邊、以及一短邊,該長邊係切齊於該第一輻射元件之邊緣,該短邊之長度係相同於該缺口長度。
- 如申請專利範圍第1項所述之三頻段天線,其中該第一輻射元件之總長度係為頻率為該第一中心頻率之電磁波之四分之一波長或其倍數。
- 如申請專利範圍第1項所述之三頻段天線,其中該第二輻射元件之總長度係為頻率為該第二中心頻率之電磁波之四分之一波長或其倍數。
- 如申請專利範圍第1項所述之三頻段天線,其中該第一中心頻率係為2.5GHz,且該第一工作頻段係為2.2GHz至2.8GHz。
- 如申請專利範圍第1項所述之三頻段天線,其中該第二中心頻率係為3.5GHz,且該第二工作頻段係為3GHz至4GHz。
- 如申請專利範圍第1項所述之三頻段天線,其中該第三中心頻率係為5GHz,且該第三工作頻段係為4.2GHz至6GHz。
- 如申請專利範圍第1項所述之三頻段天線,其中該絕緣介質層係為一印刷電路板基板、或空氣。
- 如申請專利範圍第17項所述之三頻段天線,其中該印刷電路板基板係為一FR4材質之矩形印刷電路板基板。
- 如申請專利範圍第1項所述之三頻段天線,其中該接地元件、該第一輻射元件以及該第二輻射元件均為薄層金屬。
- 一種攜帶式電子裝置,其設置有一三頻段天線,該三頻段天線包括:一絕緣介質層,具有一第一表面以及一第二表面;一第一輻射元件,係設置於該第一表面,用以諧振第一工作頻段,其係具有第一中心頻率,該第一輻射元件上設置有一饋入部以及一接地部;一第二輻射元件,係用以與該第一輻射元件諧振出第二工作頻段,其係具有第二中心頻率,且該第二中心頻率係大於該第一中心頻率,該第二輻射元件設置於該第二表面,其係隔著該絕緣介質層疊合至該第一輻射元件下方,而與該第一輻射元件之間產生一寄生電容;一饋入元件,係連接至該饋入部以進行饋入;以及一接地元件,係與該接地部相連;其中,該饋入元件為一饋入線且設置於該第一表面;該接地元件設置於該第二表面,係隔著該絶緣介質層位於該饋入元 件下方,並以導線與該接地部相連;其中該第一輻射元件與第二輻射元件之間產生的寄生電容與該第二輻射元件之寄生電感諧振產生第三工作頻段,其係具有第三中心頻率,且該第三中心頻率係大於該第二中心頻率。
- 如申請專利範圍第20項所述之攜帶式電子裝置係為一筆記型電腦、一個人數位助理或一攜帶式行動電話。
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US20110199265A1 (en) | 2011-08-18 |
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