5 15 20 五、發明說明（l) 諝 先 閱 讀 背 面 之 注 意 事 項 再 填 寫 頁 雙頻操作的天線是天線研究及應用上相當重要的課 題。由於雙頻槽孔天線在設計上比微帶天線等困難許多， 所以相關研究及設計極少。昔知利用共面波導電感耦合饋 入方式的雙矩形摺叠槽孔（folded slot)天線需要連接一個 相當複雜的共振槽孔株（resonant si〇t stubs )的匹配網路來 達成雙操作頻帶的阻抗匹配、不僅結構複雜，而且不易製 作。 在本發明中’我們提出一種共面波導饋入的雙頻矩形 雙迴路槽孔天線的設計「參閱圖式中第丨圖所示」。本發 明之天線包含兩個同一中心的内、外矩形槽孔迴路。此天 線的前兩個共振頻率分別是由天線外圈和内圈槽孔迴路的 周長來決定’同時兩個頻率具有相同的輻射極化面。經由 調整50歐姆共面波導的中央金屬微帶的突出部分長度，二 個頻率即可同時得到良好的阻抗匹配，形成雙頻操作。 經濟部t央標準局員工消费合作社印製 另外’由於本發明之天線的兩個矩形槽孔迴路的共振 波長均大約為一個波長左右，所以可以容易地利用天線外 圈及内圈槽孔迴路的外觀周長比來決定其頻率比，並設計 不同頻率的雙頻雙迴路槽孔天線。 本發明所述天線實際製作後的量測結果：如圖式2中 所示為在固定外圈槽孔迴路尺寸下，三種不同的内圈槽孔 迴路尺寸設計所量測得到的反射損失（retuml〇ss)結果。 天線的設計參數列於圖2之圖式說明，而相關的實驗數據 列於下表。由10dB返回損失所定義的操作頻寬，可以觀 察到槽孔天線的雙頻頻寬都在7%以上，低頻之操作頻寬更 本紙張尺度適用中國國家榡A4規格（2丨0χ297公爱-5 15 20 V. Description of the invention (l) 谞 Read the notes on the back first and then fill in the page. Dual-frequency antenna is a very important subject in antenna research and application. Because dual-frequency slot antennas are much more difficult to design than microstrip antennas, there is very little related research and design. It was known that the use of a coplanar waveguide inductive coupling feed-in dual-rectangular folded slot antenna requires the connection of a fairly complex resonant slot strain (matching network) to achieve dual operating frequency bands. Impedance matching, not only complicated structure, but also difficult to make. In the present invention, we propose a design of a dual-frequency rectangular dual-loop slot antenna fed by a coplanar waveguide "see the figure in the figure". The antenna of the present invention includes two inner and outer rectangular slotted circuits with the same center. The first two resonance frequencies of this antenna are determined by the perimeters of the slot loops of the outer and inner loops of the antenna, respectively. At the same time, the two frequencies have the same radiation polarization plane. By adjusting the length of the protruding portion of the central metal microstrip of the 50 ohm coplanar waveguide, two frequencies can get good impedance matching at the same time, forming dual-frequency operation. Printed by the Consumers' Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs. In addition, since the resonance wavelengths of the two rectangular slotted loops of the antenna of the present invention are about one wavelength, the outer and inner slotted loops of the antenna can be easily used. The perimeter ratio of the appearance determines its frequency ratio, and a dual-frequency dual-loop slot antenna with different frequencies is designed. The measurement results after the antenna of the present invention is actually manufactured: as shown in Figure 2 are the reflection losses measured by three different inner ring slot circuit size designs under a fixed outer ring slot circuit size design. 〇ss) results. The design parameters of the antenna are listed in the schematic description of Figure 2, and the relevant experimental data are listed in the table below. The operating bandwidth is defined by the 10dB return loss. It can be observed that the dual-band bandwidth of the slot antenna is more than 7%, and the operating bandwidth of the low-frequency is more. This paper standard applies to the Chinese national 榡 A4 specification (2 丨 0χ297 public love-
45 T5 2Q Α7 Β7 五、發明說明（2) 高達13.6%上，遠比一般微帶天線的頻寬來得大。而第二個 共振頻率(高頻)會隨著内圈槽孔迴路尺寸減小而提高，使得 雙頻的頻率比從1.327上升至1.54。而且，各不同尺寸的設 計’都可以得到良好的阻抗匹配。同時’所得到的兩個頻 率的比值與天線的外、内圈槽孔迴路周長比值非常接近， 也與所預測的相同，這項特性使得本發明之天線非常容易 得到不同頻率比值的雙頻操作。 經濟部中央標準局具工消费合作社印製 圖2設計⑴ 圖2設計(2) 圖2設計⑶ 内圈槽孔迴路 之外圍長度， 寬度(公釐） 37, 12 35, 10 33,8 外圈槽孔迴路 之外圍長度， 寬度(公釐） 45, 20 45, 20 — 〜 45, 20 共振頻率 f\，f2 (MHz) 1822, 2417 1858, 2608 1834, 2824 頻寬 BWb BW2 (%) 13.6, 7.0 15.9, 7.0 17.8, 7.8 頻率比（f2/f〗） 1.327 1.404 1.540 外、内圈槽孔 迴路周長比 1.327 1.444 1.585 (CNS) Α4 規格（210x297 公釐） 445 T5 2Q Α7 Β7 V. Description of the invention (2) It is as high as 13.6%, which is much larger than the bandwidth of a general microstrip antenna. The second resonance frequency (high frequency) will increase as the size of the inner ring slot circuit decreases, making the frequency ratio of the dual frequency increase from 1.327 to 1.54. Moreover, each of different design sizes' can get good impedance matching. At the same time, the ratio of the two frequencies obtained is very close to the ratio of the perimeters of the slot loops on the outer and inner rings of the antenna, and it is also the same as predicted. This characteristic makes the antenna of the present invention very easy to obtain dual-frequency with different frequency ratio operating. Printed by the Central Standards Bureau of the Ministry of Economic Affairs and Industrial Cooperatives. Figure 2 Design ⑴ Figure 2 Design (2) Figure 2 Design ⑶ Peripheral length and width of the slot circuit in the inner ring (mm) 37, 12 35, 10 33, 8 Outer ring Peripheral length and width of slotted loop (mm) 45, 20 45, 20 — ～ 45, 20 Resonant frequency f \, f2 (MHz) 1822, 2417 1858, 2608 1834, 2824 Bandwidth BWb BW2 (%) 13.6, 7.0 15.9, 7.0 17.8, 7.8 Frequency ratio (f2 / f) 1.327 1.404 1.540 Outer and inner ring slot circuit perimeter ratio 1.327 1.444 1.585 (CNS) Α4 Specifications (210x297 mm) 4
515 2Q A7 B7 五、發明說明（3) 圖3中所示則為本項天線設計之内圈槽孔之外圍長度 及寬度別為為3S公爱及1〇公餐時的輕射場型之量測結 果。天線的設計參數列於圖2之圖式說明。其結果顯示： 在雙頻的操作頻寬内皆具有相同的極化平面且同為垂向輻 射的輻射場型’同時在轴向的方向上，其交又極化輕射皆 低於-20dB。圖4中所示則為圖3中天線所量測得到的天線 增益結果。圖中所示，在操作頻率為1858和2608 MHz 時，所量測的天線增益約為5.7dBi和4 5 dBi。 綜合上述說明，本發明所述天線不僅具有結構簡單、低 姿勢、易於製作等優點，而且在設計上，只需調整共面波導 的中央金屬微帶的突出部分長度即可達成良好匹配。改變内 圈槽孔尺寸大小可以設計不同的頻率比的雙頻槽孔天線；改 變外圈槽孔尺寸亦可改變頻率比。而且二個頻率的操作頻寬 均較一般微帶天線來得大，非常適合工業及產業的實際應 用’足符合發明創作之目標。 [国式說明] 第1圖為本發明之一種共面波導饋入的雙頻雙迴路槽 孔天線的結構圖。本發明之天線包含一個外圈的槽孔迴路 (1)和一個内圈的槽孔迴路（2)，兩者均由一個共面波導(3) 電容耦合方式激發，而共面波導的中央金屬微帶的突出部分 (4)是為了匹配所以延伸突出的。所有結構均製作在一個基底 層⑶上面的接地面(ground plane)(6)上。 請 先 閱 讀 背 意 事 項 再 填 寫 本 頁 經濟部中央揉準局貝工消费合作社印製 本紙張尺度適用中a國家搮準（CNS) A4規格（210x297公釐） 451520 A7 B7 五、發明說明（4) 第2圖為本發明之天線的反射損失實驗量測結果。其中 外圈槽孔迴路的外圍長度為45公釐，外圍寬度為2〇公釐， 内、外圈的槽孔寬度皆為2公釐，微波基板厚度為16公董， 相對介電係數為4.4，接地面尺寸為9〇公釐χ 75公釐，共 面波導取50歐姆特性阻抗。⑴為内圈槽孔迴路之外圍長度 及寬度分別為37公釐及12公釐時；(2)為内圈槽孔迴路之外 圍長度及寬度分別為35公釐及1〇公釐時；(3)為内圈槽孔迴 路之外圍長度及寬度分別為33公釐及8公釐時的量測結果。 第3圖為本發明之天線在當内圈槽孔迴路之外圍長度及 寬度分別為35公釐及10公釐時[第2圖之設計(2)]的輻射場 型實驗量測結果。粗線代表主極化(co-p〇larization)量測結 果’細線代表交叉極化(cross-polarization)量測結果。（1)為天 線操作在1858 MHz之E平面(x-z平面)的量測結果；（2)為 天線操作在1858 MHz之Η平面(y-z平面)的量測結果；（3) 為天線操作在2608 MHz之之E平面(x-z平面)的量測結 果；⑷為天線操作在2608 MHz之Η平面(y-z平面)的量測 結果。其他天線參數如圖2說明中所示。 請 先 鬩 讀 背 意 事 項 再 瑱 寫 本 頁 裝 訂 Λ 經濟部中央標準局員工消费合作社印製 第4圖為本發明之天線在當内圈槽孔迴路之外圍長度及 寬度分別為35公釐及10公釐時[第2圖之設計(¾]的天線增 益量測結果。（1)為天線操作於低頻帶時的天線增益量測結 果；（¾為天線操作於高頻帶時的天線增益量測結果。其他 天線參數如圖2說明中所示。 本紙張尺度適用中國國家標準（CNS) A4规格（210x297公釐） f' 4515 20 I A7 j B7 j 五、發明說明（5) [圓式簡單說明] ; { I 第1圖為本發明天線的結構圖。 第2圖為本發明天線的反射損失實驗結果。 第3圖為本發明天線的輻射場型實驗結果。 第4圖為本發明天線的天線增益實驗結果。 經濟部t央標準局員工消費合作社印製 本紙張尺度適用令國國家標準（CNS) A4規格（210x297公釐）515 2Q A7 B7 V. Description of the invention (3) The outer length and width of the inner ring slot of the antenna design shown in Figure 3 are the amount of light field type when 3S public love and 10 public meals测 结果。 Test results. The design parameters of the antenna are listed in the diagram of FIG. 2. The results show that: in the dual-frequency operating bandwidth, they all have the same polarization plane and the same vertical radiation field type. At the same time, in the axial direction, the cross-polarized light emission is less than -20dB. . Figure 4 shows the antenna gain results measured by the antenna in Figure 3. As shown in the figure, the measured antenna gain is approximately 5.7dBi and 4 5 dBi at operating frequencies of 1858 and 2608 MHz. To sum up, the antenna of the present invention not only has the advantages of simple structure, low posture, and easy fabrication, but also in design, it only needs to adjust the length of the protruding portion of the central metal microstrip of the coplanar waveguide to achieve a good match. Changing the slot size of the inner ring can design dual-frequency slot antennas with different frequency ratios; changing the slot size of the outer ring can also change the frequency ratio. In addition, the operating bandwidth of the two frequencies is larger than that of a general microstrip antenna, which is very suitable for industrial and industrial applications. [Chinese-style explanation] Fig. 1 is a structural diagram of a dual-frequency dual-loop slot antenna fed by a coplanar waveguide according to the present invention. The antenna of the present invention comprises a slotted loop circuit (1) of an outer ring and a slotted loop circuit (2) of an inner ring, both of which are excited by a coplanar waveguide (3) by capacitive coupling, and the central metal of the coplanar waveguide The protruding part (4) of the microstrip is extended for the purpose of matching. All structures are fabricated on a ground plane (6) above a base layer (3). Please read the remarks before filling in this page. Printed by the Central Government Bureau of the Ministry of Economic Affairs, Shellfish Consumer Cooperatives. The paper size is applicable to the National Standard (CNS) A4 (210x297 mm) 451520 A7 B7. Figure 2 is the experimental measurement result of the reflection loss of the antenna of the present invention. The outer ring slot circuit has a length of 45 mm and a width of 20 mm. The slot width of the inner and outer rings is 2 mm. The thickness of the microwave substrate is 16 mm. The relative permittivity is 4.4. The ground plane size is 90 mm x 75 mm, and the coplanar waveguide takes a 50 ohm characteristic impedance. ⑴ is the outer length and width of the inner ring slot circuit when it is 37 mm and 12 mm; (2) is the outer length and width of the inner ring slot circuit when it is 35 mm and 10 mm; 3) It is the measurement result when the outer length and width of the inner ring slot circuit are 33 mm and 8 mm, respectively. Fig. 3 is the radiation field-type experimental measurement results of the antenna of the present invention when the outer length and width of the inner loop slot circuit are 35 mm and 10 mm, respectively [Design (2) in Fig. 2]. The thick line represents the measurement result of co-pollarization. The thin line represents the measurement result of cross-polarization. (1) Measurement results of the antenna operating at the E plane (xz plane) at 1858 MHz; (2) Measurement results of the antenna operating at the 在 plane (yz plane) at 1858 MHz; (3) Operation of the antenna at 2608 Measurement results of the E plane (xz plane) in MHz; ⑷ is the measurement result of the antenna operating in the Η plane (yz plane) at 2608 MHz. Other antenna parameters are shown in the description of Figure 2. Please read the memorandum before writing this page for binding. Λ Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs. Figure 4 shows the outer length and width of the antenna loop of the invention when the inner ring slot circuit is 35 mm Antenna gain measurement results for [Design in Figure 2] (10) at 10 mm. (1) Antenna gain measurement results when the antenna is operating in a low frequency band; (¾) Antenna gain values when the antenna is operating in a high frequency band Measurement results. Other antenna parameters are shown in the description of Figure 2. This paper size applies to the Chinese National Standard (CNS) A4 specification (210x297 mm) f '4515 20 I A7 j B7 j 5. Description of the invention (5) [Round type Brief description]; {I FIG. 1 is a structural diagram of an antenna of the present invention. FIG. 2 is an experimental result of a reflection loss of the antenna of the present invention. FIG. 3 is an experimental result of a radiation field type of the antenna of the present invention. Antenna gain experiment results. Printed by the Consumers' Cooperative of the Central Bureau of Standards, Ministry of Economic Affairs, the paper size is applicable to the national standard (CNS) A4 specification (210x297 mm)