583791 玖、發明說明： 發明所屬之技術領域 本發明係關於一種多頻天線模組及其無線傳輸裝置，特 別是利用兩個天線所組成之一多頻天線模組及其無線傳輸 裝置。 先前技術 隨著無線通訊科技的不斷創新發展，手機的使用已成為 現代人不可或缺的通訊工具之一，而無線區域網路I (Wireless Local Area Network，WLAN )亦蓬勃發展。作 為無線區域網路裝置訊號接收與發射要件之天線，目前已 發展出各種不同種類及形式，但其最終目的不外乎要涵蓋 越廣的輻射電場，以達到最佳的收發效果。另外，鑑於攜 帶及置放空間的方便性，天線設計的趨勢是越小越好。 ISM ( Industrial，Scientific and Medical )頻道為一不需 付費申請的全球性公眾共用頻帶，其頻譜分佈範圍為 900MHz、2.4GHz 及 5GHz ° 該 ISM 頻道的 2.4GHz 之射頻· (Radio Frequency，RF ) 頻帶，因其頻帶較窄 (2.4-2.843 5GHZ)，目前的使用已超出其負荷，而造成擁 擠的現象。 為求良好的通訊品質及較佳的穩定性，新制訂的無線網 路通訊協定 802.11a 之 U-NII( 47CFR1 5.401 )另提出 5GHz 附近的頻帶以供使用，其中5.150-5.250GHz頻帶限於 50mW以下的輻射功率使用，5.250-5.350GHZ頻帶限於 250mW以下的輻射功率使用，5.725-5.825GHZ頻帶限於 H:\HU\TYSVfi：邦科技\80443 NEW FORM.DOC -5- lOOOmW 以下的輻射功率使用。802.11a 之 ISM (47CFR15.247 )通訊協定貝"見定於5.725-5.850GHZ頻帶 限於lOOOmW以下的輻射功率使用。以上的無線電磁波波 長係位於5 1.30-58.25mm的範圍内。另外，無線網路通訊 協定 802.11b/g ISM( 47CFR15.247 )規定 2.400-2.483 5GHZ 頻帶限於1 OOOmW以下的輻射功率使用，且其無線電磁波 波長係位於120 · 7-125mm的範圍内。 由於目前廣泛使用的2.4GHz與上述5GHz頻帶不具有自 然二階倍頻諧振的關係，若一天線必須同時應用2.4GHz 及5GHz，其設計不像目前手機使用的900MHz及1800MHz 的雙頻天線那樣容易，而仍有相當的困難度及技術瓶頸有 待克服。 發明内容 本發明之主要目的係提供一多頻天線模組，以應用於當 今無線傳輸裝置，並藉由其易製造及易調整等特點，以降 低成本及得到較佳的電磁波輻射場形。 本發明之多頻天線模組係應用於無線傳輸裝置，其包含 一第一天線及一第二天線。該第一天線係用於收發一第一 頻率之訊號，該第二天線係用於收發一第二頻率之訊號， 且該第二頻率大於該第一頻率。該第一天線與第二天線沿 其縱向約互相平行，且兩者間的距離小於該第二頻率所對 應之波長的二分之一。 該第一及第二天線可為袖管形偶極天線（sleeve dipole antenna )或其他各式天線。另外，亦可將該第一及第二天 H:\HU\TYSWi：邦科技\80443 NEW FORM.DOC -6- 線製作於—電路板中，而可得到等同的功效。 汶夕J天、、泉模組於孩第二頻率（高頻）之電磁波輻射具 有方向性。因此茲多頻天線模組在無線傳輸裝置的應用 上，若要得到全向場形（omni_directional radiation pattern) 4电磁m可將兩個多頻天線模組分置於該無線傳輸 裝置王體的兩側，且其約互相平行。各多頻天線模組之置 放方式係將所包含之第一天線置於内侧，且將包含之第二 天線置於相，也就是將料收發高頻訊號之第二天線置 於外侧，而用於收發低頻訊號之第一天線置於内侧，故可 彌補單一夕頻天線模組於收發高頻訊號時所產生不均勻電 磁波輻射的現象。 實施方式 參照圖1，一多頻天線模組1〇包含一第一天線U及一 第二天線12 ,該第一天線i丨及第二天線12為袖管形偶極 天線，且沿其縱向約互相平行。該第一天線丨丨係用於接收 2.4GHz頻帶之訊號，而第二天線12則用以接收5GHz頻 帶之訊號。該第一天線11係由一金屬桿112、一袖形管U4 及一傳輸線116組成，其中該金屬桿112的長度約28mm， 而該袖形管114的直徑及長度分別約為5nim及24.5mm。 同樣地’该弟.一天線12係由一金屬桿12 2、一袖形管12 4 及一傳輸線12 6所組成’其中該金屬桿12 2之長度約為 12.8mm，該袖形管124的直徑及長度分別約為5mm及 10mm。原則上，該金屬桿112與袖形管114或該金屬桿 122與袖形管124的總長必須符合其使用頻率所對應波長583791 发明 Description of the invention: The technical field to which the invention belongs The present invention relates to a multi-frequency antenna module and a wireless transmission device thereof, particularly a multi-frequency antenna module and a wireless transmission device composed of two antennas. Previous technologies With the continuous innovation and development of wireless communication technology, the use of mobile phones has become one of the indispensable communication tools for modern people, and the Wireless Local Area Network (WLAN) has also flourished. As antennas for signal receiving and transmitting elements of wireless LAN devices, various types and forms have been developed, but the ultimate purpose is to cover a wider radiated electric field to achieve the best transmission and reception results. In addition, given the convenience of carrying and storage space, the trend of antenna design is as small as possible. The ISM (Industrial, Scientific and Medical) channel is a global public frequency band that does not need to pay for applications, and its spectrum distribution range is 900MHz, 2.4GHz, and 5GHz ° The 2.4GHz radio frequency (RF) band of the ISM channel Due to its narrow frequency band (2.4-2.843 5GHZ), the current usage has exceeded its load, which caused congestion. In order to obtain good communication quality and better stability, the newly developed wireless network communication protocol 802.11a U-NII (47CFR1 5.401) also proposes a frequency band around 5GHz for use, of which the 5.150-5.250GHz band is limited to less than 50mW For use of radiant power, the 5.250-5.350GHZ band is limited to radiant power use below 250mW, and the 5.725-5.825GHZ band is limited to H: \ HU \ TYSVfi: Bang Technology \ 80443 NEW FORM.DOC -5- 1000mW radiant power use. 802.11a's ISM (47CFR15.247) communication protocol "see the 5.725-5.850GHZ band is limited to radiant power use below 1000mW. The above wireless electromagnetic wave length is in the range of 5 1.30-58.25mm. In addition, the wireless network communication protocol 802.11b / g ISM (47CFR15.247) stipulates that the 2.400-2.483 5GHZ band is limited to the use of radiant power below 1 OOOmW, and its wireless electromagnetic wave wavelength is in the range of 120 · 7-125mm. Because the 2.4GHz and 5GHz frequency bands currently widely used do not have a natural second-order frequency doubling resonance, if an antenna must be used with both 2.4GHz and 5GHz, its design is not as easy as the dual-band antennas of 900MHz and 1800MHz currently used in mobile phones. There are still considerable difficulties and technical bottlenecks to be overcome. SUMMARY OF THE INVENTION The main object of the present invention is to provide a multi-frequency antenna module, which is applied to today's wireless transmission devices, and has the characteristics of easy manufacturing and easy adjustment, etc., to reduce the cost and obtain better electromagnetic wave radiation field shape. The multi-frequency antenna module of the present invention is applied to a wireless transmission device and includes a first antenna and a second antenna. The first antenna is used to send and receive a signal of a first frequency, the second antenna is used to send and receive a signal of a second frequency, and the second frequency is greater than the first frequency. The first antenna and the second antenna are approximately parallel to each other in the longitudinal direction, and the distance between the two antennas is less than one half of the wavelength corresponding to the second frequency. The first and second antennas can be sleeve dipole antennas or other various antennas. In addition, the first and second day H: \ HU \ TYSWi: Bang Technology \ 80443 NEW FORM.DOC -6- line can be made in the circuit board, and the equivalent effect can be obtained. The radiant electromagnetic wave radiation at the second frequency (high frequency) of the J-Day and Qin modules in Wenxi is directional. Therefore, in the application of a multi-frequency antenna module to a wireless transmission device, to obtain an omni_directional radiation pattern of 4 electromagnetic m, two multi-frequency antenna module components can be placed on the two sides of the body of the wireless transmission device. Side and approximately parallel to each other. Each multi-frequency antenna module is placed in such a way that the included first antenna is placed on the inside and the included second antenna is placed on the phase, that is, the second antenna for transmitting and receiving high-frequency signals is placed on The first antenna for transmitting and receiving low-frequency signals is placed on the outside, so it can compensate for the phenomenon of uneven electromagnetic radiation generated by a single evening frequency antenna module when receiving and transmitting high-frequency signals. 1, a multi-frequency antenna module 10 includes a first antenna U and a second antenna 12. The first antenna i and the second antenna 12 are sleeve-shaped dipole antennas, and Parallel to each other in its longitudinal direction. The first antenna is used to receive signals in the 2.4 GHz band, and the second antenna 12 is used to receive signals in the 5 GHz band. The first antenna 11 is composed of a metal rod 112, a sleeve tube U4, and a transmission line 116. The length of the metal rod 112 is about 28 mm, and the diameter and length of the sleeve tube 114 are about 5 nm and 24.5, respectively. mm. Similarly, 'this brother. An antenna 12 is composed of a metal rod 12 2, a sleeve tube 12 4 and a transmission line 12 6', wherein the length of the metal rod 12 2 is about 12.8 mm, and the length of the sleeve tube 124 The diameter and length are approximately 5mm and 10mm, respectively. In principle, the total length of the metal rod 112 and the sleeve tube 114 or the metal rod 122 and the sleeve tube 124 must conform to the wavelength corresponding to its frequency of use
H:\HU\TYSVfi:邦科技\80443 NEW FORM.DOC 583791 的二分之一，再依實際測試的結果做調整。該第一天線n 及第二天線12間的距離△約15.7腿’其小於該第二天線 12之所使用頻率5GHz的相對應波長的二分之一。 將該多頻天線模組10進行電磁波測試，若該多頻天線模 組10以垂直於紙面放置，且該第一天線 係分別位於9。度及27。度的方向，其電磁波:射二 圖2所示，其強度單位為dBi。由圖2可知，使用2.備z 頻帶的第一天線11之電磁波輻射仍保持—全向場形，而使 用相對較高頻率5.1GHz之第二天線12的輕射場形則受限 於度方向，即該第一天線U所在方向。顯見該第一天 線11的電磁波輻射不受該第二天線12 天線嶋該第一天線u當成一反射天、:二 電磁波產生方向性。該多頻天線模組於2 4GHz及 5.1GHz之增益（Gain)分別為⑺咖及（规卜亦可顯 示該多頻天線模組1G #高頻（5.1GHz)時產生方向性的 特性。 圖3顯示該多頻天線模組1〇之電位駐波比 Standing Wave Ratio, VS WR)於 2〇1^至 3GHz 頻帶之測 試結果。由圖3可知，該多頻天線模組1〇於24GHz至 2.5GHz 間之 VSWR 均很小，其於 2.4GHz、2.45GHz 及 2.5GHz的VSWR分別僅為um、丨〇2〇〇及i i266，顯 見該多頻天線模組10的訊號幾乎沒有傳輸反射上的損 失，而有極佳的回饋損失（return i〇ss)值，即沒有阻抗不 匹酉己（impedance mismatched )的問題。 H:\HU\TYS\佳邦科技\80443 NEW F0RM.D0C -8- 圖4顯示該多頻天線模組10於5(3沿至6GHz間之vSWR 測試結果。由圖4可知，該多頻天線模組1〇於51GHz至 5.2GHz頻帶之VSWR均很小，其於51GHz、5 15(}1^及 5.2GHz 的 VSWR 分別僅為 、l4827 及 13193。顯 示該多頻天線模組10約90%以上的能量均可順利傳輸，故 其於該頻帶亦無阻抗匹配上的問題。 該多頻天線模組10之第一天線U及第二天線12可直接 利用傳輸線116及126電氣連接至一無線傳輸裝置之對應 電路，以供訊號傳送。參照圖5，該多頻天線模組1 〇亦可 利用一結合器（combiner) 13先行結合該第一天線u及 弟一天線12 ’再藉由另一饋入線（feeding Hne ) 136電氣 連接於一無線傳輸裝置（圖未示出）之對應電路。該饋入 線136可由微帶線（microstrip Hne )、共平面波導線 (coplanar waveguide line)、導線（strip line)及槽線（sl〇t line )等組成。 本叙明之多頻天線模組並不限定於使用袖管形偶極天 線，亦可使用其他形式的天線，或將天線以電路板的形式 製作而成。 參照圖6，一多頻天線模組60係於一電路板61上製作 一弟一電路62及一第二電路63，其分別當作低、高頻天 線之用。該第一電路62及第二電路63彼此間之距離必須 小於該高頻所對應之波長的二分之一。該電路板6丨之端部 可设计一金手指64，用以連接至一無線傳輸裝置之電路板 上的對應插槽（圖未示出），以進行訊號傳輸。 H:\HU\TYS\佳邦科技\8〇443 NEW -9- 583791 因本發明之多頻天線模組於高頻的電磁波輻射具有方向 性，因此可利用此特性應用於需要高指向性的裝置。若希 望於高頻時仍有全向場形之電磁波輻射，其應用可如圖7 所不。一無線傳輸裝置70 (例如一存取橋接器）包含一主 體73及裝設於該主體73左右兩側之多頻天線模組71及 72。該多頻天線模組7卜72之置放有其方向性，其係將該 多頻天線模組71、72個別包含之低頻天線711、721置於 内侧，而包含之高頻天線712、722則置於外側，即類似以 該主體73為中心線鏡射。如此一來，該高頻天線712、722 _ 向外的輻射電磁波可不受到該低頻天線711、721的阻擂或 反射’故其亦可達到全向場形的特性。 本發明將高、低頻天線組合成一多頻天線模組，其製程 十分簡單，故可有效降低生產成本。另外，本發明之多頻 天線模組之電磁波輻射場形可藉由改變該高、低頻天線之 距離進行調整，故其具有輻射場形多樣化（pauem diversity)的特性，可適用於各種無線傳輸裝置，且可得籲 到最佳的訊號收發效果。 本發明之技術内容及技術特點巳揭示如上，然而熟悉本 項技術之人士仍可能基於本發明之教示及揭示而作種種不 月離本發明精神之替換及修飾。因此，本發明之保護範圍 應不限於實施例所揭示者，而應包括各種不背離本發明之 替換及修飾，並為以下之申請專利範圍所涵蓋。 圖式簡單說明 本發明將依照後附圖式來說明，其中·· H:\HU\TYS\佳邦科技_43 呢…Fqrm d% 583791 圖1係本發日Η 一 > t <夕頻天線模組示意圖； 圖2係本發日月士 <夕頻天線模組之輻射電磁波場形圖； 圖3顯示本私日日、 又月 < 多頻天線模組於2GHz至3GHz麵德 之VSWR測試結果； -咿 圖"、不本發明之多頻天線模組於5GHz至6GHz殉 之VSWR測試結果； / 圖5係本發明之多頻天線模組與一結合器之組合 圖， 圖6係本發明之另一多頻天線模組示意圖；及 · 圖 7係本發明之多頻天線模組之應用示意圖。 元件符號說明 13 結合器 136 饋入線 60 多頻天線模組 61 電路板 62 第一電路 63 第二電路 64 金手指 70 無線傳輸裝置 71、 7 2 多頻天線挺組 711 、721 低頻天 712 、722 高頻天線 73 主體 H:\HU\TYSVfi：邦科技\80443 NEW FORM.DOC -11-H: \ HU \ TYSVfi: Bang Technology \ 80443 One-half of NEW FORM.DOC 583791, and then adjust according to the actual test results. The distance Δ between the first antenna n and the second antenna 12 is about 15.7 legs, which is less than one half of the corresponding wavelength of the frequency of 5 GHz used by the second antenna 12. The multi-frequency antenna module 10 is subjected to an electromagnetic wave test. If the multi-frequency antenna module 10 is placed perpendicular to the paper surface, and the first antenna systems are located at 9, respectively. Degree and 27. Direction, its electromagnetic wave: shot two As shown in Figure 2, its intensity unit is dBi. It can be seen from FIG. 2 that the electromagnetic wave radiation of the first antenna 11 using the 2.z-band is still maintained—omnidirectional field shape, while the light field shape of the second antenna 12 using a relatively high frequency 5.1GHz is limited by Degree direction, that is, the direction in which the first antenna U is located. It is obvious that the electromagnetic wave radiation of the first antenna 11 is not affected by the antenna of the second antenna 12; the first antenna u is regarded as a reflection sky, and the directivity of the electromagnetic wave is generated. The gain (Gain) of the multi-band antenna module at 24 GHz and 5.1 GHz is respectively ⑺ and (the specifications also show the directivity characteristics when the multi-band antenna module 1G # high frequency (5.1 GHz). 3 shows the test results of the standing wave ratio (VS WR) of the multi-band antenna module 10 in the frequency band of 201 to 3 GHz. As can be seen from FIG. 3, the VSWR of the multi-frequency antenna module 10 between 24GHz and 2.5GHz is very small, and its VSWR at 2.4GHz, 2.45GHz, and 2.5GHz are only um, 〇〇〇２〇, and i i266, respectively. It is obvious that the signal of the multi-frequency antenna module 10 has almost no transmission loss, and has an excellent return loss value, that is, there is no problem of impedance mismatched. H: \ HU \ TYS \ Jiabang Technology \ 80443 NEW F0RM.D0C -8- Figure 4 shows the vSWR test results of the multi-band antenna module 10 from 5 (3 edges to 6 GHz. As can be seen from Figure 4, the multi-band antenna The VSWR of module 10 in the 51GHz to 5.2GHz band is very small, and the VSWR of 51GHz, 5 15 () 1 ^, and 5.2GHz are only 1,827, and 13193, respectively. It shows that the multi-frequency antenna module 10 is about 90% The above energy can be transmitted smoothly, so there is no problem in impedance matching in this frequency band. The first antenna U and the second antenna 12 of the multi-frequency antenna module 10 can be electrically connected to the transmission line 116 and 126 directly. The corresponding circuit of a wireless transmission device is used for signal transmission. Referring to FIG. 5, the multi-frequency antenna module 10 can also use a combiner 13 to first combine the first antenna u and the first antenna 12 ′. Another feeding line (feeding Hne) 136 is electrically connected to the corresponding circuit of a wireless transmission device (not shown). The feeding line 136 may be a microstrip Hne, a coplanar waveguide line, It consists of a strip line, a slot line, etc. The multi-frequency antenna described in this description The module is not limited to using a sleeve-shaped dipole antenna, but other types of antennas can also be used, or the antenna can be made in the form of a circuit board. Referring to FIG. 6, a multi-frequency antenna module 60 is connected to a circuit board 61 A second circuit, a second circuit, and a second circuit, which are used as low-frequency and high-frequency antennas, must be fabricated. The distance between the first circuit and the second circuit must be smaller than the wavelength corresponding to the high frequency. One half. A gold finger 64 can be designed at the end of the circuit board 6 丨 for connecting to a corresponding slot (not shown) on the circuit board of a wireless transmission device for signal transmission. H: \ HU \ TYS \ Jiabang Technology \ 8〇443 NEW -9- 583791 Because the multi-frequency antenna module of the present invention has directivity at high-frequency electromagnetic wave radiation, this feature can be used in devices that require high directivity. If It is hoped that there is still omnidirectional field-shaped electromagnetic wave radiation at high frequencies, and its application can be as shown in Fig. 7. A wireless transmission device 70 (such as an access bridge) includes a main body 73 and two left and right sides of the main body 73. Side multi-frequency antenna modules 71 and 72. The multi-frequency antenna module 7 The placement of 72 has its directivity, which means that the low-frequency antennas 711 and 721 included in the multi-frequency antenna modules 71 and 72 are placed inside, and the included high-frequency antennas 712 and 722 are placed on the outside, similar to The main body 73 is mirrored by the centerline. In this way, the outward radiated electromagnetic waves of the high-frequency antennas 712 and 722 _ are not blocked or reflected by the low-frequency antennas 711 and 721, so they can also reach an omnidirectional field shape. characteristic. The invention combines the high-frequency and low-frequency antennas into a multi-frequency antenna module. The manufacturing process is very simple, so the production cost can be effectively reduced. In addition, the electromagnetic wave radiation field shape of the multi-frequency antenna module of the present invention can be adjusted by changing the distance between the high and low frequency antennas. Therefore, it has the characteristic of pauem diversity and can be applied to various wireless transmissions. Device, and get the best signal transmission and reception effect. The technical content and technical features of the present invention are disclosed as above. However, those skilled in the art may still make various substitutions and modifications based on the teaching and disclosure of the present invention without departing from the spirit of the present invention. Therefore, the protection scope of the present invention should not be limited to those disclosed in the embodiments, but should include various substitutions and modifications that do not depart from the present invention, and are covered by the following patent application scope. Brief description of the drawings The present invention will be explained in accordance with the following drawings, where: H: \ HU \ TYS \ Jiabang Technology_43 ... Fqrm d% 583791 Figure 1 is the date of this issue Schematic diagram of the antenna module; Figure 2 is the radiated electromagnetic wave shape diagram of the sun and moon &evening; antenna frequency module; Figure 3 shows the sun and moon of this day &month; multi-frequency antenna module at 2GHz to 3GHz VSWR test results;-Figure ", VSWR test results of the multi-frequency antenna module of the present invention at 5GHz to 6GHz; / Figure 5 is a combination diagram of the multi-frequency antenna module of the present invention and a combiner, Fig. 6 is a schematic diagram of another multi-frequency antenna module of the present invention; and Fig. 7 is a schematic diagram of an application of the multi-frequency antenna module of the present invention. Description of component symbols 13 Combiner 136 Feeder line 60 Multi-frequency antenna module 61 Circuit board 62 First circuit 63 Second circuit 64 Gold finger 70 Wireless transmission device 71, 7 2 Multi-frequency antenna support group 711, 721 Low-frequency antenna 712, 722 High-frequency antenna 73 main body H: \ HU \ TYSVfi: Bang Technology \ 80443 NEW FORM.DOC -11-