1360915 % 九、發明說明 【發明所屬之技術領域】 本發明有關於一種腕攜型無線儀器，且 關於一種具有嵌入於腕帶中之磁性環形天線 °於以下說明中，可瞭解到環形天線係作爲 於相同平面之單一環形導體，其操作之頻率 導體以給予大體上均勻的電流。 【先前技術】 近年來，以一嵌入於腕帶中之天線系統 電頻率訊號的此種無線儀器已變得常見。許 解決方法揭露一種具有周圍可變尺寸的天線 於腕帶中，佩戴於一個人手臂上並藉無線電 此方式，天線需夠長以接收超過VHF頻帶（ 之頻率訊號。如第3圖所示，環形天線1 01 形成於腕帶102內，其連接至腕攜型無線儀 1 03以經由一中心扣接結構1 04形成一連續 該帶扣接時，該腕帶之一扣環。 然而，此種在中心扣接結構104上之環 顯著地影響接收。由於此部分易於損壞，因 一提供較佳操作的機構。此外，腕帶102通 帶調整結構以使腕帶之長度調整至佩戴者手 調整造成天線之環形長度隨佩戴者不同而改 接收頻帶隨佩戴者不同而改變。 更特定地，有 的手錶接收器 一大體上安置 通常爲沿著該 作爲接收無線 多習知技術之 裝置，其嵌入 而供使用。以 3 0-3 00MHZ ) 可以單元型式 器100之外殼 環形，例如當 形連接的配置 此，難以設計 常包含有一腕 臂之厚度。此 變，其造成可 -4- 1360915 —種提供無線儀器100 —附加裝置的解決方法是複雜 且龐大的，其中該附加裝置用以補償源自於天線之環形長 度變化的天線增益及共振頻率之改變，此方法非此種無線 儀器所想要的。 依據美國專利案號US5968566，其揭露一種如第4圖 所示的解決方法，以避免先前列舉型式的由於環形天線之 附接或分離所造成之連接失效及/或故障，並用以提供一 腕攜型無線儀器，其可接收之頻帶不受佩戴者之手臂厚度 影響。 該腕攜型無線儀器1 1 〇包括外殼1 1 3、中心扣接式腕 帶112。腕帶112具有上表面121與下表面122，以及在 其中心之扣接結構1 14，且包含一對腕帶部分1 12a、1 12b ，其每一者附接至外殼113之一端。接收天線ill設置於 腕帶之至少一部分112a的內部以接收訊號，天線111經 由端子連接至外殼113內部之接收電路。依據此說明書， 環形天線111延伸於腕帶112之上表面121與下表面122 間，且未通過中心扣接結構1 1 4。需注意的是，不需附接 腕帶112以形成一環路的接收是可行的，如同佩戴時。 然而，依據美國專利案號US 5 968 5 66之解決方法具 有一些缺點。在先前所描述之天線結構上所作之量測，其 顯示非最佳化天線效率與非最佳化雜訊匹配。天線損失之 一不可忽略部分係由於人體手腕干擾天線及由於腕帶之介 電材料所造成。天線效率的改善可以藉由減低在天線輻射 阻抗中天線損失之比率而達成。因此，天線效率可藉減低 -5- 1360915 天線損失或藉增加天線輻射阻抗而改善。 因此，本發明之一目的爲藉減低天線之歐姆與介電損 失與增加天線輻射阻抗而改善天線效率。 【發明內容】 本發明之主要目的爲實現一腕攜型無線儀器，用以接 收具有安裝於腕帶內部之二環形天線的無線頻率訊號，這 些天線具有改善的天線效率。一方面藉並聯連接二環形天 線可達成減低天線損失之衝擊，另一方面藉串聯連接二環 形天線可達成增加天線輻射阻抗。 爲達到上述主要目的，依據本發明之一較佳實施例， 無線儀器包括一腕帶，其具有連接至一外殼之對向邊緣的 第一與第二帶部分，該第一與第二帶部分之每一者具有上 與下表面。第一與第二單一環形天線分別嵌入於該第一與 第二帶部分且於該對應的上與下表面間延伸。該二單一環 形天線通過該外殼之對向邊緣而連接至第一與第二調諧電 路，其中該第一與第二調諧電路連接至設置於該外殼內之 一天線接收器，且經由一互連電路以混合方式連接一起， 二調諧電路以部分並聯及部分串聯方式連接。 【實施方式】 如於先前所述者，本發明有關於腕攜型無線儀器用以 於無線頻帶30至3 00MHz中，且較佳地於無線頻帶88至 10 8MHz中，使用無線資料傳輸系統接收無線頻率訊號。 -6- 1360915 本發明更特定地有關於具有最佳天線效率之天線結 首先參考第1圖，顯示腕攜型無線儀器之橫剖 無線儀器1包括一腕帶2，其具有連接至外殼3之 緣之第一 2a與第二2b帶部分，每一帶部分具有上 下表面。第一 4a與第二4b環形天線，分別嵌入於 第二帶部分2a與2b且於該對應的上表面與下表面 。該二環形天線4a與4b分別通過外殼3之對向邊 接至第一 5a與第二5b調諧電路，調諧電路二者連 置於該外殼3內之天線接收器6。另外調諧電路二 一互連電路7以混合方式連接一起，該互連電路將 於第2圖。 第2圖爲依據本發明之一較佳實施例無線儀器 內部之天線電路示意圖。第1圖共同元件之參考編 持不變。 環形天線4a與4b二者，此處以線圈形式之示 示’經由二調諧電路5a與5b連接至天線接收器6 ，一互連電路7提供以互連二調諧電路5a與5b及 天線4a與4b。 如於先前所述者，本發明之一目的爲最佳化天 。爲達此目的’隨著輻射阻抗減低天線損失之比率 的’及因此減低天線損失與增加輻射阻抗。關於本 顯示天線之歐姆與介電損失之減少可藉並聯連接環 4a與4b二者而達到。以此等二環形天線之並聯， 減少約5 0 %，同時輻射阻抗保持於單一環形天線之 構。 面圖。 對向邊 表面與 第一與 間延伸 緣而連 接至設 者經由 更詳述 之外殼 號將保 意圖表 。此外 二環形 線效率 爲重要 發明已 形天線 損失可 位準。 1360915 關於本發明其亦顯示輻射阻抗之增加可藉串聯連接環形天 線4a與4b二者而達到，以此等二環形天線之串聯，輻射 阻抗可增加一因子4，同時損失僅增加一因子約2或稍大 於2，接著隨輻射阻抗以約一因子2減低天線損失之比率 〇 爲該目的，互連電路7係設計用以互連調諧電路5a 與5b二者且接著二環形天線4a與4b以混合方式互連於 這些二“極端”連接間，即部分並聯及部分串聯。依據第2 圖所示之較佳實施例，互連電路7爲一電容器網路，其包 括以部分並聯連接分別連接二調諧電路5a與5b的第一 CP1與第二CP2電容器，及以部分串聯連接二調諧電路5a 與5b的第三電容器Cs。 依據所示例子，每一環形天線（分別爲4a與4b )， 於二連接點上（分別爲8a、9a與8b、9b)連接至相對應的 調諧電路（分別爲5a與5b)。第一電容器CP1 —端連接 至連接點8a且另一端連接至8b。第二電容器CP2 —端連 接至連接點9a且另一端連接至9b。調諧電路5a與5b二 者接著經由二電容器（：^與CP2部分並聯連接。第三電容 器Cs —端連接至連接點8b且另一端連接至連接點9a。 二電路接著經由第三電容器Cs部分串聯連接，最後天線 接收器連接至連接點8a與9b。 應可了解到，以另.一方式而言相同的結果可以第三電 容器Cs連接至連接點8a與9b，且以天線接收器6連接 至連接點8 b與9 a而得到》 (S> -8- 1360915 使用此混合連接，二環形天線接著以 串聯連接，其允許在輻射阻抗中天線損失 且天線效率大輻提升。 爲進一步增加天線效率，注重調諧電 的。事實上，由於此類型天線之較小頻寬 之調諧爲需要的。此調諧可使用變容器而 依據如第2圖所示之較佳實施例，每 分別爲5a與5b，藉並聯連接變容器而設 導損失。 因此，第一調諧電路5a包含串聯連 與變容器51a，及一端連接於電容器52a 且另一端連接至既定的電位VA之電阻器 收中電阻器53a供應變容器51a —固定調 電容隨此調諧電壓而改變。因此，天線之 率需要不同的變容器電容，且其係以此調 壓V a藉由習知的方法，例如以二元搜尋容 第二調諧電路5b如調諧電路5a爲相 含串聯連接之電容器52b與變容器51b， 容器5 2b與變容器51b間且另~端連接3 之電阻器53b。於無線接收中電阻器53b —固定調諧電壓，變容器電容隨此調諧電 ，天線之任何特定接收頻率需要不同的變 係以此調諧電壓調諧。電壓Vb亦藉由習 以二元搜尋演算法決定。 部分並聯與部分 之比率大幅減低 路之兀件爲重要 緣故，環形天線 達成。 一天線調諧電路 計以導入最低傳 接之電容器52a 與變容器5 1 a間 53a。於無線接 諧電壓，變容器 任何特定接收頻 諧電壓調諧。電 复算法決定。 同型式的。其包 及一端連接於電 至既定的電位VB 供應變容器5 1 b 壓而改變。因此 容器電容，且其 知的方法，例如 <S> -9- 1360915 作爲另一選擇方式，每一調諧電路可包含二變容器’ 而非一變容器與一電容器，串聯但卻相反極性連接以最佳 化這些調諧電路之行爲。 爲改善調諧電路5a與5b之大的訊號響應，變容器 5 1a與5 lb二者以“反（anti ) ”並聯方式，接著以相反極 性方式連接。雖然二調諧電路之不對稱性，然而它爲一較 佳的解決方法，因爲它帶來較少的損失且較對稱的調諧電 路需要較少的元件，該對稱的調諧電路包括二變容器之每 一者串聯及成相反極性之方式。 另外地，調諧電路5 a與5 b較佳地被供以一電容器 Ct以調整它們的調諧範圍，其一端連接於第一調諧電路 5a之電容器52a與變容器51a間，且另一端連接於第二 調諧電路5b之變容器51b與電容器52b間。 注意的是，環形天線較佳爲矩形的或所謂之0形開口 的》較佳地，二環形天線具有相同的形狀以保有對稱性。 然而’可瞭解到任何其他的環形天線形狀可被使用只要它 可適入腕帶部分。二環形天線使用無線資料傳輸系統較佳 地操作於頻帶88至108MHz» 亦須注意的是，無線儀器較佳爲一手錶。 最後’可瞭解到上述實施例僅爲許多可能特定的實施 例之例示’其係代表本發明之原理。多數與變化的其他設 置’於調諧電路與互連電路之細節上，熟知此技藝相關人 士可容易依據這些原理設計而無需逸離本發明之範圍與精 神0 -10- 1360915 【圖式簡單說明】 本發明之前述與額外的目的、特色與優點從較佳實施 例之以下詳細描述將變得更爲顯明，如附圖所示，其中： 第1圖爲依據本發明之一較佳實施例之腕攜型無線儀 器之一橫剖面圖。 第2圖爲依據本發明之〜較佳實施例之無線儀器外殻 內部的天線電路示意圖。 第3圖’如已描述者，爲一習知技術手錶型式呼叫器 之立體圖。 第4圖，如已描述者，爲另一習知技術手鎮型式呼叫 器之立體圖。 【主要元件符號說明】BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wrist-carrying wireless instrument, and to a magnetic loop antenna having a wristband embedded in the wristband. In the following description, the loop antenna system can be understood as A single loop conductor in the same plane that operates the frequency conductor to impart a substantially uniform current. [Prior Art] In recent years, such wireless instruments having an antenna system electric frequency signal embedded in a wristband have become common. The solution discloses an antenna having a variable surrounding size in a wristband, worn on a person's arm and by radio, the antenna needs to be long enough to receive a frequency signal beyond the VHF band. As shown in Figure 3, the ring The antenna 101 is formed in the wristband 102 and is coupled to the wrist-carrying radio 101 to form a buckle of the wristband via a center fastening structure 104. However, such a buckle The ring on the central fastening structure 104 significantly affects reception. This portion is susceptible to damage due to a mechanism that provides better operation. In addition, the wristband 102 is tuned to adjust the length of the wristband to the wearer's hand. The resulting ring length of the antenna varies with the wearer depending on the wearer. More specifically, some watch receivers are generally placed generally along the device as a receiving wireless multi-application, embedded For use. The outer casing of the unit type 100 can be ring-shaped, for example, in the configuration of the shape connection, it is difficult to design the thickness of the wrist arm often included. This variation, which results in a wireless instrument 100-additional device that is -4- 1360915, is complex and bulky, wherein the additional device is used to compensate for antenna gain and resonant frequency resulting from changes in the loop length of the antenna. Change, this method is not what this wireless instrument wants. In accordance with U.S. Patent No. 5,968,566, a solution is shown in Fig. 4 to avoid connection failures and/or failures due to attachment or separation of loop antennas of the previously listed versions, and to provide a wrist carrying A wireless instrument that receives a frequency band that is unaffected by the thickness of the wearer's arm. The wrist-carrying wireless instrument 1 1 includes a housing 1 13 and a center-fastened wrist strap 112. The wristband 112 has an upper surface 121 and a lower surface 122, and a fastening structure 1 14 at its center and includes a pair of wristband portions 1 12a, 1 12b, each of which is attached to one end of the outer casing 113. The receiving antenna ill is disposed inside at least a portion 112a of the wristband to receive a signal, and the antenna 111 is connected to a receiving circuit inside the casing 113 via a terminal. According to this specification, the loop antenna 111 extends between the upper surface 121 and the lower surface 122 of the wristband 112 and does not pass through the center fastening structure 112. It should be noted that it is possible to attach the wristband 112 to form a loop, as is the case when worn. However, the solution according to U.S. Patent No. 5,968, 5, 66 has some disadvantages. The measurements made on the previously described antenna structure show that the non-optimized antenna efficiency matches the non-optimized noise. One of the non-negligible parts of the antenna loss is caused by the human wrist interfering with the antenna and the dielectric material of the wristband. Improvements in antenna efficiency can be achieved by reducing the ratio of antenna losses in the antenna radiation impedance. Therefore, the antenna efficiency can be improved by reducing the antenna loss of -5 - 1360915 or by increasing the radiation impedance of the antenna. Accordingly, it is an object of the present invention to improve antenna efficiency by reducing the ohmic and dielectric losses of the antenna and increasing the antenna radiation impedance. SUMMARY OF THE INVENTION The main object of the present invention is to implement a wrist-carrying wireless instrument for receiving wireless frequency signals having two loop antennas mounted inside a wristband, the antennas having improved antenna efficiency. On the one hand, the impact of reducing the loss of the antenna can be achieved by connecting the two loop antennas in parallel, and on the other hand, increasing the radiation impedance of the antenna can be achieved by connecting the two loop antennas in series. To achieve the above primary object, in accordance with a preferred embodiment of the present invention, a wireless instrument includes a wristband having first and second strap portions coupled to opposite edges of a housing, the first and second strap portions Each has an upper and a lower surface. First and second single loop antennas are respectively embedded in the first and second strip portions and extend between the corresponding upper and lower surfaces. The two single loop antennas are coupled to the first and second tuning circuits by opposing edges of the housing, wherein the first and second tuning circuits are coupled to an antenna receiver disposed within the housing and via an interconnect The circuits are connected together in a hybrid manner, and the two tuning circuits are connected in partial parallel and partial series. [Embodiment] As described above, the present invention relates to a wrist-carrying wireless device for receiving in a wireless frequency band of 30 to 300 MHz, and preferably in a wireless frequency band of 88 to 108 MHz, using a wireless data transmission system. Wireless frequency signal. -6- 1360915 The present invention more particularly relates to an antenna junction having optimum antenna efficiency. Referring first to Figure 1, a cross-sectional wireless instrument 1 showing a wrist-carrying wireless device includes a wristband 2 having a connection to the outer casing 3. The first 2a and the second 2b belt portions each have an upper and lower surface. The first 4a and second 4b loop antennas are respectively embedded in the second strip portions 2a and 2b and on the corresponding upper and lower surfaces. The two loop antennas 4a and 4b are respectively connected to the first 5a and second 5b tuning circuits by the outer casing 3, and the tuning circuits are connected to the antenna receiver 6 in the casing 3. Further, the tuning circuit two interconnection circuits 7 are connected together in a hybrid manner, and the interconnection circuit will be shown in Fig. 2. Figure 2 is a schematic diagram of an antenna circuit inside a wireless instrument in accordance with a preferred embodiment of the present invention. The reference to the common components in Figure 1 is unchanged. Both of the loop antennas 4a and 4b, here shown in the form of a coil, are connected to the antenna receiver 6 via the two tuning circuits 5a and 5b, and an interconnection circuit 7 is provided to interconnect the two tuning circuits 5a and 5b and the antennas 4a and 4b. As previously stated, one of the objects of the present invention is to optimize the day. For this purpose 'as the radiation impedance reduces the ratio of antenna losses' and thus reduces antenna losses and increases radiation impedance. The reduction in ohmic and dielectric losses of the present display antenna can be achieved by connecting the connection rings 4a and 4b in parallel. With the parallel connection of the two loop antennas, the reduction is about 50%, while the radiation impedance is maintained in a single loop antenna configuration. Surface map. The opposite side surface and the first and outer extension edges are connected to the designer via a more detailed housing number. In addition, the efficiency of the two loops is important. 1360915 Regarding the invention, it is also shown that the increase of the radiation impedance can be achieved by connecting the loop antennas 4a and 4b in series, so that the radiation impedance can be increased by a factor of 4 in the series connection of the two loop antennas, and the loss is only increased by a factor of about 2. Or slightly greater than 2, and then reduce the ratio of antenna loss by about a factor of 2 with the radiation impedance. For this purpose, the interconnection circuit 7 is designed to interconnect both the tuning circuits 5a and 5b and then the two loop antennas 4a and 4b The hybrid approach is interconnected between these two "extreme" connections, ie partially parallel and partially connected. According to a preferred embodiment shown in FIG. 2, the interconnection circuit 7 is a capacitor network including a first CP1 and a second CP2 capacitor connected in parallel to the two tuning circuits 5a and 5b, respectively, and partially connected in series. The third capacitor Cs of the two tuning circuits 5a and 5b is connected. According to the illustrated example, each loop antenna (4a and 4b, respectively) is connected to the corresponding tuning circuit (5a and 5b, respectively) at the two connection points (8a, 9a and 8b, 9b, respectively). The first capacitor CP1 is connected at its end to the connection point 8a and at the other end to the 8b. The second capacitor CP2 is connected at its end to the connection point 9a and at the other end to the 9b. Both tuning circuits 5a and 5b are then connected in parallel via a two capacitor (.) to the CP2 portion. The third capacitor Cs is connected to the connection point 8b and the other end is connected to the connection point 9a. The second circuit is then connected in series via the third capacitor Cs. Connected, the last antenna receiver is connected to the connection points 8a and 9b. It should be understood that the same result can be connected to the connection points 8a and 9b by the third capacitor Cs and connected to the antenna receiver 6 by the same result. Connected to points 8b and 9a (S> -8-1360915 using this hybrid connection, the two loop antennas are then connected in series, which allows antenna loss in radiated impedance and antenna efficiency is greatly increased. To further increase antenna efficiency Focus on tuning power. In fact, tuning is required for smaller bandwidths of this type of antenna. This tuning can use varactors according to the preferred embodiment shown in Figure 2, each of 5a and 5b. Therefore, the conduction loss is set by connecting the varactors in parallel. Therefore, the first tuning circuit 5a includes the series connection and the varactor 51a, and one end is connected to the capacitor 52a and the other end is connected to the predetermined potential VA. The resistor receiving resistor 53a supplies the varactor 51a - the fixed tuning capacitance changes with the tuning voltage. Therefore, the antenna ratio requires different varactor capacitances, and this is used to regulate V a by a conventional method. For example, the binary tuning circuit 2b, such as the tuning circuit 5a, is a resistor 53b including a capacitor 52b and a varactor 51b connected in series, and a capacitor 53b connected between the container 52b and the varactor 51b and connected to the other end. The receiving resistor 53b fixes the tuning voltage, and the varactor capacitance is tuned accordingly, and any particular receiving frequency of the antenna requires different variations to tune the tuning voltage. The voltage Vb is also determined by the binary search algorithm. The ratio of parallel to partial is greatly reduced, and the loop antenna is important. An antenna tuning circuit is used to introduce the lowest-passing capacitor 52a and the variator 5 1 a between 53a. For wirelessly connecting the voltage, the varactor is any The specific receiving harmonic voltage is tuned by the electrical complex algorithm. The same type of package and one end connected to the electrical potential to the predetermined potential VB supply varactor 5 1 b pressure changes. This container capacitance, and its known method, for example, <S> -9- 1360915 is another alternative, each tuning circuit may comprise a two-variable container instead of a variable container and a capacitor, but connected in series but oppositely connected To optimize the behavior of these tuned circuits. To improve the large signal response of the tuned circuits 5a and 5b, the varactors 5 1a and 5 lb are connected in an "anti" parallel manner, followed by opposite polarity connections. The asymmetry of the second tuned circuit, however it is a preferred solution because it introduces less loss and the more symmetrical tuning circuit requires fewer components, the symmetrical tuning circuit comprising each of the two variable containers The way in which they are connected in series and in opposite polarity. Alternatively, the tuning circuits 5a and 5b are preferably supplied with a capacitor Ct to adjust their tuning range, one end of which is connected between the capacitor 52a of the first tuning circuit 5a and the varactor 51a, and the other end is connected to the The variable container 51b of the second tuning circuit 5b is connected to the capacitor 52b. It is noted that the loop antenna is preferably rectangular or so-called zero-shaped opening. Preferably, the two loop antennas have the same shape to maintain symmetry. However, it can be understood that any other loop antenna shape can be used as long as it fits into the wristband portion. The two loop antennas preferably operate in the frequency band 88 to 108 MHz using a wireless data transmission system. » It should also be noted that the wireless instrument is preferably a wristwatch. Finally, it is to be understood that the above-described embodiments are merely illustrative of many possible specific embodiments, which are representative of the principles of the invention. Most of the other settings with variations are in the details of the tuned circuit and the interconnect circuit. Those skilled in the art can easily design according to these principles without departing from the scope and spirit of the present invention. 0 -10- 1360915 [Simplified Description] The foregoing and other objects, features and advantages of the present invention will become more apparent from A cross-sectional view of one of the wrist-carrying wireless instruments. Figure 2 is a schematic diagram of an antenna circuit inside a wireless instrument housing in accordance with a preferred embodiment of the present invention. Figure 3 is a perspective view of a prior art watch type pager as already described. Figure 4 is a perspective view of another conventional technique hand-held pager as already described. [Main component symbol description]
1, 100, 110 無線儀器 2， 102， 112 腕帶 2a 第一帶部分 2b 第二帶部分 3，103，113 外殼 4 a 第一環形天線 4b 第二環形天線 5 a 第一調諧電路 5b 第二調諧電路 6 天線接收益 -11 -1, 100, 110 wireless instrument 2, 102, 112 wrist strap 2a first strap portion 2b second strap portion 3, 103, 113 housing 4 a first loop antenna 4b second loop antenna 5 a first tuning circuit 5b Two tuned circuit 6 antenna receiving benefit -11 -
(S 1360915(S 1360915
7 互連電路 8a，8b, 9a, 9b 連接點 5 la, 5 1b 變容器 52a, 52b 電容器 53a, 53b 電阻器 101, 111 環形天線 104, 114 扣接結構 112a, 112b 部分 12 1 上表面 122 下表面7 interconnection circuit 8a, 8b, 9a, 9b connection point 5 la, 5 1b varactor 52a, 52b capacitor 53a, 53b resistor 101, 111 loop antenna 104, 114 fastening structure 112a, 112b portion 12 1 upper surface 122 surface
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