201027843 六、發明說明： .【發明所屬之技術領域】 本發明涉及一種天線，尤其涉及一種雙頻天線及應用 該雙頻天線之無線通信裝置。 【先前技術】 於行動電話、個人數位助理(personal Digital Assistant，PDA)等無 線通信裝置中，天線作為其用來發射、接收無線電波以傳遞、交換無 線電訊號之部件，無疑係無線通信裝置中最重要之元件之一。目前， 無線通信裝置一般都需要具備於雙頻或者更多頻段下進行通信之功 能，因此其天線裝置一般都使用雙頻或多頻天線。 請參閲圖1，一種習知之雙頻天線i 一般具有一第一輻射單元U 及一第二輻射單元12。其中，所述第二輻射單元12之一端與所述第 一輻射單元11電性連接，且第一輻射單元u依據第二輻射單元12分 為一第一輻射部111及一第二輻射部112。所述第二輻射單元12之另 二端為接地端。於此雙頻天線i中，所述第—輻射部1U及第二賴射 ❿單70 12產生高頻共振以工作於一高頻頻段。第二輻射部112及第二輻 射單元12產生低頻共振並工作於一低頻頻段。 雖然上述雙頻天線1可I作於兩個頻段，但由於該雙頻天線工之 兩個輻射單兀11及12共用一個接地端，且高頻頻段及麵紐公用 第—輪射單兀12 ’故雙頻天線i之工作頻段所需之天線長度直接反應 於第-輻射部111及第二輻射部112之長度上，若對其中一個頻帶之 天線輕射體之尺寸參數進行調整，就會影響另一個頻帶之效能。如此， :但會增加雙頻天線之設計1作4，而且雜以使兩麵帶分別擁有 自獨立、彼此之财受干涉之共振__寬赃性能。 201027843 【發明内容】 有鑒於此’有必要提供一種結構簡單，且可獨立調整頻寬之雙頻 天線。 另，還有必要提供一種應用所述雙頻天線之無線通信裝置。 一種雙頻天線’其包括一第一天線部及與所述第一天線部相耦合 之一第二天線部’二者用於接收及發射不同頻段之電磁波訊號。所述 第二天線部鄰近第一天線部之一側開設二槽孔，所述二槽孔相鄰之兩201027843 VI. Description of the Invention: [Technical Field] The present invention relates to an antenna, and more particularly to a dual frequency antenna and a wireless communication device using the same. [Prior Art] In a wireless communication device such as a mobile phone or a personal digital assistant (PDA), an antenna is the most used in a wireless communication device as a component for transmitting and receiving radio waves to transmit and exchange radio signals. One of the important components. At present, wireless communication devices generally need to have the function of communicating in dual frequency bands or more frequency bands, and therefore antenna devices generally use dual-frequency or multi-frequency antennas. Referring to FIG. 1, a conventional dual-band antenna i generally has a first radiating element U and a second radiating element 12. The first radiating unit 12 is electrically connected to the first radiating unit 11 , and the first radiating unit u is divided into a first radiating portion 111 and a second radiating portion 112 according to the second radiating unit 12 . . The other end of the second radiating element 12 is a ground terminal. In the dual-frequency antenna i, the first radiating portion 1U and the second reflecting unit 70 12 generate high frequency resonance to operate in a high frequency band. The second radiating portion 112 and the second radiating portion 12 generate low frequency resonance and operate in a low frequency band. Although the above dual-band antenna 1 can be used in two frequency bands, since the two radiating cells 11 and 12 of the dual-frequency antenna work share a ground terminal, and the high frequency band and the face-to-new common-rotation unit 12 'The antenna length required for the working frequency band of the dual-frequency antenna i is directly reflected in the length of the first-radiation portion 111 and the second radiation portion 112. If the size parameter of the antenna light-emitting body of one of the frequency bands is adjusted, Affect the performance of another frequency band. In this way, the design of the dual-frequency antenna is increased by 4, and it is mixed so that the two-sided tapes have their own independent and mutual interference. 201027843 SUMMARY OF THE INVENTION In view of the above, it is necessary to provide a dual-frequency antenna which is simple in structure and can independently adjust the bandwidth. In addition, it is also necessary to provide a wireless communication device to which the dual frequency antenna is applied. A dual frequency antenna 'includes a first antenna portion and a second antenna portion coupled to the first antenna portion for receiving and transmitting electromagnetic wave signals of different frequency bands. The second antenna portion defines two slots adjacent to one side of the first antenna portion, and the two slots are adjacent to the two slots.
端於背離第一天線部之方向延伸形成二縫隙，直至將第二天線部開 通，所述二縫隙與所述槽孔之間相連通，並將所述第二天線部分割為 二接地面及一饋入端，所述二接地面及槽孔關於所述饋入端對稱，所 述第一天線部之一端垂直於第二天線部鄰近槽孔之一側，所述饋入端 與所述第一天線部電性連接，用於向第一天線部輸入或輸出射頻訊號。 一種無線通信裝置，其包括一電路基板，該電路基板上設有一訊 號傳輸端，所述訊號傳輪端用於接收和發射電磁波訊號。所述無線通 號 信裝置還包括一設於所述電路基板上之一雙頻天線，其包括一第一天 線部及與所述第一天線部相耦合之一第二天線部，二者用於接收及發 射不同頻段之電磁波訊號。所述第二天線部鄰近第一天線部之一側開 設二槽孔，所述二槽孔相鄰之兩端於背離第一天線部之方向延伸形成 一縫隙’直至將第一天線部開通’所述二縫隙與所述槽孔之間相連通， 並將所述第二天線部分割為二接地面及一饋入端，所述二接地面及槽 孔關於所述饋入端對稱，所述第一天線部之一端垂直於第二天線部鄰 近槽孔之一側，所述饋入端與所述第一天線部電性連接，所述訊號輸 出端電性連接於所賴人端，餘向麟雙頻天職人錢出射頻訊 5 201027843 相較於習知技術，所述雙頻天線利用第一天線部和第二天線部之 之_合效應，以增強第-天線部於低頻帶輻射之效果。此外，該第 .-天線部和第二天線部之電場方向相互垂直，使得於該雙頻天線於形 成高、低兩個頻帶時’兩個頻帶分別具有各自之共振頻率和獨立之頻 寬調整性能，故’於最佳化單—頻帶之共振辭或頻寬時，不會因為 各自參數之改變而影響另-個頻帶之共振頻率或頻寬。如此，便會降 低天線之設計複雜度，有利於減輕工作量及節約成本。 【實施方式】 ❹ 請參關2及圖3 ’所示為本發明較佳實施例適用於行動電話、 pda等無線通信裝置之雙頻天線1〇〇。所述雙頻天娘1〇〇為雙頻共面 波導饋入混合型天線’其係由共面波導電感性槽孔天線和雙“ l，，形單 極天線結合而成’從而具備雙頻效能。該雙頻天線1〇〇裝設於一無線 通信裝置内之基板90上，並電性連接於該基板9〇。所述基板卯為一 設於所述無線通信裝置内之印刷電路板的化如α祕加邮MB)， 其金屬部分為該雙頻天線100提供接地。所述基板9〇大致里矩形板 ❿狀，其上設有-tfl號傳輸端92及一二接地端94。所述訊號傳輸端92 用於接收該雙頻天線1〇〇收到之射頻訊號及傳送由該雙頻天線丄㈤發 射之射頻峨’職接地端94絲板9G上之導電部分，其用於將所 述雙頻天線100接地。 所述雙頻天線100由具有良好導電性能之金屬如銅合金等製造而 成’其包括用於發射和接收無線訊號之一第一天線部1〇及一第二天線 部3G，二者為-體成型，且二者之間藉由互感而產生耗合效應。 所述第-天線部10為-單極天線(M〇n〇p〇le缝咖），其譜振頻 雜麵職Frequency)設置為24GHz，可用於收發低頻通信電磁波 201027843 訊號。該第一天線部10採用雙“L”形設計，其包括一第一輻射體12 .及-第一輻射體14，所述二輻射體12、14形狀相同且相互對稱設置。 '該第-輻射體12包括-第一片體122及一第二片體124，二者垂直連 接且寬度相同所述第二輕射體14包括一第三片體及一第四片 體144’ 一者垂直連接，且寬度相同。該第二片體124及第三片體⑷ 之長度大於所述第-片體122及第四片體144之高度。所述第一片體 122及第四片體144相互平行地連接於所述第二天線部％上，且與所 述第二天線部30垂直’所述第二片體124與所述第三片體142處於同 直線上並…與第一天線部3〇平行之方向彼此相背地延伸。所述第一 片體122之高度和第二片體124之長度與寬度之和約等於低頻波長之 四分之―’第四片體144之高度和第三片體142之長度與寬度之和亦 A等於低頻波長之四分之―，所述第—輻射體12及第二輻射體Μ用 以輻射產生該雙頻天線1〇〇之低頻共振頻率。 所述第二天線部30為一共面波導f：感性槽孔天線，其大致呈矩 形’且其缝辭設置為5.4GHz，可驗收發高頻通信電磁波訊號。 ⑩所述第二天線部30鄰近所述第一天線部1〇之一側開設二槽孔31，所 述二槽孔31相鄰之兩端於背離第一天線部1〇之方向延伸形成二縫隙 32 ’直至將所述第二天線部3G騎，從㈣第二天線部w分割為二 接地面33及一饋入端35。 所述二槽孔31大致呈矩形，其與所述接地面％鄰接，並與所站 二缝隙32相連通，且關於所述饋人端35對稱。於發射或接收射頻郭 號時’該矩形槽孔31之周圍電流強度較大，高頻帶之共振頻率 孔31所輻射。該槽孔31之長邊平行於所述第二片體124，且該槽^ 31長邊之長度約為高触長之—半，職度可錢定該天線^ 201027843 之高頻共振頻率。 - 所述二接地面33大致呈矩形片狀，其關於所述饋入端35對稱， ,其與無線通信裝置内部之基板90之接地端（圖未示）連接。該二接地 面33藉由複數調線(Bonding Wire)40相互連接’所述調線4〇跨過所述 饋入端35連接二接地面33，從而使二接地面33電勢相等。 所述饋入端35大致呈矩形片狀，其電性連接於所述第一天線部 10之二輻射體12、14 ’且垂直所述第二片體124及第三片體142。該 饋入端35位於一縫隙32之間，並鄰接於所述二接地面33。該饋入端 ❹35由-阻值為50Ω之饋入線50電性連接於無線通信裝置内部基板9〇 之訊號傳輸端92 ’用於向所述第一天線部1()和第二天線部3〇輸入微 波射頻訊號。該雙頻天線100共用所述接地面33和饋入端35。 請-併參閱圖4 ’於本實施例中，所述第一天線部1〇之第一片體 122與第四片體144之高度相等’均設置為H=4mm，所述第一天線部 10之第一片體124與第二片體142之長度相等，均設置為L1=15mm， 第一片體122、第二片體124、第三片體142、第四片體144之寬度相 _等，均設置為Wl=2mm ’其中’第一片體122與第三片體142之高度 H、第二片體124與第四片體144之長度u和寬度wi決定了低頻之 共振頻率。所述第二天線部30之槽孔31之長度L2為17酿，其寬度 W2為4mm ’其中’根據共面波導電紐槽孔天線之鋪可知，該第 二天線部30之槽孔31之長度L2約為高頻微波之半波長。所述饋入端 35之寬度W3為4mm ’所述縫隙32之寬度G為〇 4mm。 所述麵天線UK)工作時，訊號自饋入端％進入後，分別沿所述 雙頻天線之第-天線部1()和第二天線部％獲得之獨之傳播路 控，並分別于槽孔35和第-天線部1〇處強電流，使得所述第一天線 201027843 部10和第二天線部30分別產生不同之工作頻率，以使得該雙頻天線 -可分別滿足於2.4GHz和5.4GHz頻率下進行工作之要求。此外， ^因所述槽孔35與第二片體124以適當之距離平行，故可以形成互感而 進一步產生了耦合效應，從而增強了第一天線部10之輻射效果。 天線之反射係數(Reflection)可用來衡量天線工作頻帶之頻寬，天 線之反射係數圖之橫軸表示為頻率，其縱軸表示為反射損耗值(RetumForming two slits in a direction away from the first antenna portion until the second antenna portion is opened, the two slits are in communication with the slot, and the second antenna portion is divided into two a grounding surface and a feeding end, wherein the two grounding surfaces and the slot are symmetric about the feeding end, and one end of the first antenna portion is perpendicular to a side of the second antenna portion adjacent to the slot, the feeding The input end is electrically connected to the first antenna portion for inputting or outputting an RF signal to the first antenna portion. A wireless communication device includes a circuit substrate on which a signal transmission end is disposed, and the signal transmission end is configured to receive and transmit electromagnetic wave signals. The wireless communication device further includes a dual frequency antenna disposed on the circuit substrate, and includes a first antenna portion and a second antenna portion coupled to the first antenna portion. Both are used to receive and transmit electromagnetic wave signals of different frequency bands. Two slots are formed in a side of the second antenna portion adjacent to the first antenna portion, and two adjacent ends of the two slots extend in a direction away from the first antenna portion to form a slot until the first antenna portion is formed. Opening the two gaps to communicate with the slot, and dividing the second antenna portion into two ground planes and a feed end, the two ground planes and slots being about the feed end Symmetrically, one end of the first antenna portion is perpendicular to one side of the second antenna portion adjacent to the slot, the feeding end is electrically connected to the first antenna portion, and the signal output end is electrically connected At the end of the market, Yu Xianglin’s dual-frequency squad’s money is out of RF signal 5 201027843 Compared with the prior art, the dual-frequency antenna utilizes the combined effect of the first antenna portion and the second antenna portion to The effect of the first antenna portion on the low frequency band radiation is enhanced. In addition, the electric field directions of the first antenna portion and the second antenna portion are perpendicular to each other, so that when the dual frequency antenna forms two high and low frequency bands, the two frequency bands respectively have respective resonance frequencies and independent bandwidths. Adjusting the performance, so when optimizing the resonance or bandwidth of the single-band, the resonance frequency or bandwidth of the other frequency band will not be affected by the change of the respective parameters. In this way, the design complexity of the antenna is reduced, which is beneficial to reducing workload and cost. [Embodiment] ❹ Refer to FIG. 2 and FIG. 3 ′ for a dual-frequency antenna 1 适用 for a wireless communication device such as a mobile phone or a pda according to a preferred embodiment of the present invention. The dual-frequency antenna is a dual-frequency coplanar waveguide feeding hybrid antenna, which is composed of a coplanar waveguide inductive slot antenna and a double "l, a monopole antenna" to provide dual frequency The dual-frequency antenna 1 is mounted on a substrate 90 in a wireless communication device and electrically connected to the substrate 9. The substrate is a printed circuit board disposed in the wireless communication device. The metal part is provided with grounding for the dual-frequency antenna 100. The substrate 9 is substantially rectangular in shape, and has a -tfl transmission end 92 and a grounding end 94. The signal transmitting end 92 is configured to receive the RF signal received by the dual-frequency antenna 1 and transmit the conductive portion of the RF board of the dual-frequency antenna 丄(5), which is used on the wire 9G of the grounding terminal 94. The dual-frequency antenna 100 is grounded. The dual-frequency antenna 100 is fabricated from a metal having good electrical conductivity, such as a copper alloy, etc., which includes a first antenna portion 1 for transmitting and receiving wireless signals. a second antenna portion 3G, which is formed by body-molding, and by mutual inductance The first antenna portion 10 is a monopole antenna (M〇n〇p〇le sewing), and its spectral frequency is set to 24 GHz, which can be used for transmitting and receiving low frequency communication electromagnetic waves 201027843 The first antenna portion 10 adopts a double "L" shape design, and includes a first radiator 12 and a first radiator 14, which are identical in shape and symmetrically arranged with each other. The first radiator 122 includes a first body 122 and a second body 124, which are vertically connected and have the same width. The second light body 14 includes a third body and a fourth body 144'. The length of the second piece 124 and the third piece (4) is greater than the height of the first piece 122 and the fourth piece 144. The first piece 122 and the fourth piece are vertically connected. The bodies 144 are connected to the second antenna portion % in parallel with each other, and are perpendicular to the second antenna portion 30. The second sheet 124 and the third sheet 142 are on the same line and ... The direction parallel to the first antenna portion 3〇 extends away from each other. The height of the first sheet 122 and the sum of the length and width of the second sheet 124 The height of the fourth sheet 144 and the sum of the length and the width of the third sheet 142 are also equal to a quarter of the low frequency wavelength, and the first radiator 12 and the second The radiator Μ is used to radiate to generate a low frequency resonance frequency of the dual frequency antenna. The second antenna portion 30 is a coplanar waveguide f: an inductive slot antenna, which is substantially rectangular and has a slit of 5.4. GHz, the high-frequency communication electromagnetic wave signal can be transmitted and received. 10 The second antenna portion 30 defines two slots 31 adjacent to one side of the first antenna portion 1 , and the two slots adjacent to the two slots 31 The two slits 32 ′ are formed in a direction away from the first antenna portion 1 直至 until the second antenna portion 3G rides, and the (four) second antenna portion w is divided into two ground planes 33 and a feed end 35 . The two slots 31 are substantially rectangular and are adjacent to the ground plane % and are in communication with the station gap 32 and are symmetrical about the feed end 35. When the RF signal is transmitted or received, the current intensity around the rectangular slot 31 is large, and the resonant frequency of the high frequency band is radiated by the hole 31. The long side of the slot 31 is parallel to the second piece 124, and the length of the long side of the slot 31 is about a high length - half, and the high frequency resonance frequency of the antenna ^ 201027843 can be determined. The two ground planes 33 are substantially rectangular in shape and are symmetrical about the feed end 35 and are connected to a ground end (not shown) of the substrate 90 inside the wireless communication device. The two ground planes 33 are connected to each other by a plurality of bonding wires 40. The alignment wires 4 are connected to the two ground planes 33 across the feed terminals 35, so that the potentials of the two ground planes 33 are equal. The feeding end 35 is substantially in the shape of a rectangular sheet, and is electrically connected to the two radiators 12, 14' of the first antenna portion 10 and perpendicular to the second sheet 124 and the third sheet 142. The feed end 35 is located between a gap 32 and is adjacent to the two ground planes 33. The feed terminal 35 is electrically connected to the signal transmission end 92' of the internal substrate 9 of the wireless communication device by a feed line 50 having a resistance value of 50 Ω for the first antenna portion 1 () and the second antenna Part 3 〇 input microwave RF signal. The dual frequency antenna 100 shares the ground plane 33 and the feed end 35. Please refer to FIG. 4 'in this embodiment, the heights of the first piece 122 and the fourth piece 144 of the first antenna part 1' are both set to H=4 mm, the first day The first piece 124 of the line portion 10 and the second piece 142 are equal in length, and are each set to L1=15 mm, and the first piece 122, the second piece 124, the third piece 142, and the fourth piece 144 are The width phase _ and the like are both set to Wl=2mm 'where the height H of the first sheet 122 and the third sheet 142, the length u and the width wi of the second sheet 124 and the fourth sheet 144 determine the low frequency Resonance frequency. The length L2 of the slot 31 of the second antenna portion 30 is 17 and its width W2 is 4 mm 'wherein the slot of the second antenna portion 30 is known according to the spread of the coplanar wave-conducting button slot antenna. The length L2 of 31 is about half the wavelength of the high frequency microwave. The width W3 of the feed end 35 is 4 mm. The width G of the slit 32 is 〇 4 mm. When the surface antenna UK) is in operation, after the signal enters from the feed end %, the propagation path is obtained along the first antenna portion 1 () and the second antenna portion % of the dual frequency antenna respectively, and respectively a strong current is generated at the slot 35 and the first antenna portion 1〇 such that the first antenna 201027843 portion 10 and the second antenna portion 30 respectively generate different operating frequencies, so that the dual-band antennas can be satisfied respectively Requirements for operation at 2.4 GHz and 5.4 GHz. Further, since the slot 35 and the second sheet 124 are parallel at an appropriate distance, mutual inductance can be formed to further generate a coupling effect, thereby enhancing the radiation effect of the first antenna portion 10. The reflection coefficient of the antenna can be used to measure the bandwidth of the antenna operating band. The horizontal axis of the reflection coefficient of the antenna is expressed as the frequency, and the vertical axis is expressed as the reflection loss value (Retum).
Loss)，反射損耗隨頻率之變化而變化。一般以天線之電壓駐波比 (Voltage Standing Wave Ratio, VSWR)為2:1處作為天線使用之頻帶，此 ®處之反射損耗值等於-10分貝(dB)，故，反射損耗值小於等於之 頻率範_可作為天紅狀鮮。請參關4，由本實施例所示之 雙頻天線100之反射損耗隨著頻率變化之圖表可知，當Vswr=2時， 所述雙頻天線100工作於2.4GHz和5.4GHz頻段時其反射損耗值均小 於-10dB ’符合雙頻天線之應用需求，並可實現接收及發射不同頻率訊 號之功能。 所述雙頻天線1GG儀第—天線部1G和第二天線部3()之之間柄 _合效應，以增強第-天線部1〇於低頻帶輻射之效果。此外，該第一天 線部10和第二天線部30之電場方向相互垂直，使得於該雙頻天線⑽ 於形成高、低兩個頻帶時’兩個頻帶擁有各自之共振頻率和頻寬獨立 调整性’故，於最佳化單_鮮之共振辭或雜時，不會因為各自 參數之改變而影響另-個頻帶之共振頻率或頻寬。如此，便會降低天 線之設計難度。 、綜上所述’本發明符合發明專利要件，爰依法提出專利申請。惟， ^所述者僅為本發明讀佳實施例，本發明之細並不以上述實施 歹|為限，舉凡熟悉本案技藝之人士援依本發明之精神所作之等效修飾 201027843 或變化，皆應涵蓋於以下申請專利範圍内。 【圖式簡單說明】 圖1為習知之雙頻天線之示意圖。 圖2為本發明較佳實施方式雙頻天線示意圖。 圖3 意圖 為本發明較佳實施方式雙頻天線連接於基板上之使用狀雖示 圖4為圖2所示之雙頻天線之尺寸比例示意圖。 圖5為本發明較佳實施方式雙頻天線之返回損耗測气 【主要元件符號說明】 圖 1、100 第一轄射單元 11 111 第'一輕射部 112 12 第一天線部 10 12 第一片體 122 124 第二輻射體 14 142 第四片體 144 30 槽孔 31 32 接地面 33 35 調線 40 50 基板 90 92 接地端 94 Λ 雙頻天線 第一輻射部 第二輻射單元 第一輻射體 第二片體 第三片體 第二天線部 φ 缝隙 馈入端 馈入線 訊號傳輸端 10Loss), the reflection loss varies with frequency. Generally, the voltage standing wave ratio (VSWR) of the antenna is 2:1 as the frequency band used by the antenna, and the reflection loss value of the ® is equal to -10 decibels (dB), so the reflection loss value is less than or equal to The frequency range _ can be as fresh as the sky. Referring to FIG. 4, it can be seen from the graph that the reflection loss of the dual-band antenna 100 shown in this embodiment varies with frequency, and when the Vswr=2, the reflection loss of the dual-band antenna 100 operates in the 2.4 GHz and 5.4 GHz bands. The values are less than -10dB'. It meets the application requirements of dual-band antennas and can realize the function of receiving and transmitting signals of different frequencies. The dual-frequency antenna 1GG device has an effect of splicing between the antenna portion 1G and the second antenna portion 3() to enhance the effect of the first antenna portion 1 on low-band radiation. In addition, the electric field directions of the first antenna portion 10 and the second antenna portion 30 are perpendicular to each other, so that the two frequency bands have respective resonance frequencies and bandwidths when the dual frequency antenna (10) forms two high and low frequency bands. Independently tuned, the resonant frequency or bandwidth of the other frequency bands will not be affected by the change of the respective parameters when optimizing the resonance word or the noise. This will reduce the difficulty of designing the antenna. In summary, the invention conforms to the patent requirements of the invention, and the patent application is filed according to law. However, the present invention is only a preferred embodiment of the present invention, and the present invention is not limited to the above-described embodiments, and those skilled in the art will be able to modify the equivalent modification 201027843 or change according to the spirit of the present invention. All should be covered by the following patent application. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic diagram of a conventional dual frequency antenna. 2 is a schematic diagram of a dual frequency antenna according to a preferred embodiment of the present invention. FIG. 3 is a schematic view showing the size ratio of the dual-frequency antenna shown in FIG. 2 according to a preferred embodiment of the present invention. 5 is a returning loss gas measurement of a dual-frequency antenna according to a preferred embodiment of the present invention. [Main component symbol description] FIG. 1, 100 first radiation modulating unit 11 111 First light-emitting portion 112 12 First antenna portion 10 12 One piece 122 124 Second radiator 14 142 Fourth piece 144 30 Slot 31 32 Ground plane 33 35 Line 40 50 Substrate 90 92 Ground end 94 Λ Dual-frequency antenna First radiating part Second radiating element First radiation Body second body third body second antenna portion φ slot feed end feed line signal transmission end 10