200818606 九、發明說明： 【發明所屬之技術領域】 本發明係關於-種天線技術，以及更尤其是但並非僅 限於一種平板天線。 【先前技術】 數位通信在現代化時代中已經成為不可或缺，立中資 料在全世界各種位置之間傳送。尤其是，此無線通信領域 特別在此行動電話通信及’或其他與電腦相關無線裝置之領 ，中有快速發展。的確’這就是無線通信、特別是射頻㈣ 式無線通信之成長，以致於用於傳輸無線電波之頻譜變得 越來越擁擠。 任何射頻（RF)系統最重要觀點之一為：此適當天線之設 計要能夠傳輸與接收所需之無線資料，但要能夠額外地符 合所關切應用之特定設計需求。目前存在著複數種不同型 式之天線可供選擇’而其各具有其優點與缺點。此射頻⑽） 天線設計師必須嘗試與選擇此性質最適用於相關應用型式 之天線:例如’對於行動式電話應用，此射頻天線設計師 典型地寻求一種具有低功率性質之袖珍天線設計，此當在 =通信領域中，其尺寸、重量、以及可攜性為重要:係 產生此需求。 目前存在著複數種不同天線幾何形狀，例如標準雙極 式或回路式天線組態。 ^ 然而，在射頻辨識（RFID)標籤領域中，令人想要具有 一種天線其擁有某些性質，例如：小的尺寸、低的:廓:以 5 200818606 及輕的重量。此種天線可以使用作為發射器、接收器、或 發射接收器，而可以容易地裝附於可以被追蹤之封裝或其 他可移動器材。對於此種型式之應用，一種微帶天線（mic⑺ strip antenna)經常最合適。 此種微帶天線經常稱為平板天線（patch antenna)，這是 由於其由一塊覆蓋接地板、但與此接地板分開之金屬的平 板所構成。特定而言，此種平板天線經常是藉由將天線元 件圖案蝕刻成金屬跡線而製成，而將此平板天線接合至將 接地板與經蝕刻天線元件分開之絕緣基板。此種天線之其 他優點為：其容易製造且機械上堅固。此外，此平板天線 具有用於偏極化分集性之能力。 此在天線技術_另一觀念為：所謂“電性短之天線，，之概 $ ’其中此天線之電性導體之長度在物理上為短的，且經 ¥大巾田地短於此天線共振頻率之波長。再度說明，此種短 線之棱點為減少之尺寸，此在RFID標籤或辨識器天線 之領域中特別有用。 :、、;'而此種正常之微帶平板天線仍然需要為某種尺寸， 而以特疋共振頻率傳輸信號。此特別令人想要減少此裝附 於用於追蹤目的器材之此種天線之尺寸。 因此，本發明之實施例之目的為：減少此平板天線之物 理尺寸。 【發明内容】 之 據本^明之一觀點，本發明提供一種用於傳輸資料 天線此天線包括將一個電性接地層與一個導電層分開 6 200818606 之一介電層，其中’此導電層具有連接至電容元件之第一 部份。 此電容元件有利地使得此平板天線看起來電性上較物 理上為長。這意味著可以減少此天線之尺寸，同時仍然可 以相同頻率操作此天線。 此外，此平板天線之另一優點為，可以與此電容元件 之值成反比之方式改變此天線之操作頻率。因此，對於此 給定尺寸之天線，可以藉由增加此電容元件之值，而降低 共振頻率。 其中’此電容元件較佳為複數個電容器。 此等複數個電容器有利地平均間隔，以產生由天線邊 緣所輻射之更均勻之電磁場。 其中’此第一部份較佳為矩形平板天線之第一邊緣。 其中’此導電層較佳具有連接至接地板之第二部份。 其中，此天線較佳形成此裝附於一物件之RFID標籤 之一部份’以致於可以追蹤此物件之移動。 根據本發明之另一觀點提供一種矩形平板天線，其包 括·電性接地之接地板；一具有電性導體之導電層；一用 於將接地板與導電層分開之介電層；且其中，此導電層具 有：連接至接地層之第一邊緣；以及具有用於增強邊緣電容 之複數個電容器之第二邊緣。 根據本务明之另一觀點提供一種矩形平板天線，其包 括·電性接地之接地板；一具有電性導體之導電層；一用 於將接地板與導電層分開之介電層；且其中，此導電層具 7 200818606 有第-與第二輻射邊緣’其各具有複數個電容器，用於掸 強其各邊緣電容。 、9 【實施方式】 圖1顯示基本平板天線之平面圖，而圖2顯示此天線 之側視圖。特定而言，在圖i中所顯示之平板天線具有圓 形形狀，但應瞭解平板天線亦可以為其他形狀，例如正方200818606 IX. DESCRIPTION OF THE INVENTION: TECHNICAL FIELD OF THE INVENTION The present invention relates to antenna technology, and more particularly, but not exclusively, to a panel antenna. [Prior Art] Digital communication has become indispensable in the modern era, and the information is transmitted between various locations around the world. In particular, this field of wireless communication has developed rapidly in particular in this mobile telephone communication and or other computer-related wireless devices. Indeed, this is the growth of wireless communications, especially radio frequency (tetra) wireless communications, so that the spectrum used to transmit radio waves becomes more and more crowded. One of the most important points of any radio frequency (RF) system is that the appropriate antenna is designed to transmit and receive the required wireless data, but to be able to additionally meet the specific design needs of the application of interest. There are currently a number of different types of antennas to choose from, each of which has its advantages and disadvantages. This RF (10)) antenna designer must try and choose the antenna that is most suitable for the relevant application type: for example, for mobile phone applications, this RF antenna designer typically seeks a compact antenna design with low power properties. In the field of = communication, its size, weight, and portability are important: this demand is generated. There are a number of different antenna geometries, such as standard bipolar or loop antenna configurations. ^ However, in the field of radio frequency identification (RFID) tags, it is desirable to have an antenna that has certain properties, such as: small size, low profile: 5 200818606 and light weight. Such an antenna can be used as a transmitter, receiver, or transmitter receiver, and can be easily attached to a package that can be tracked or other mobile device. For this type of application, a microstrip antenna (mic (7) strip antenna) is often the most suitable. Such a microstrip antenna is often referred to as a patch antenna because it consists of a metal plate that covers the ground plate but is separated from the ground plate. In particular, such planar antennas are often fabricated by etching an antenna element pattern into metal traces that are bonded to an insulating substrate that separates the ground plane from the etched antenna elements. Other advantages of such an antenna are that it is easy to manufacture and mechanically strong. In addition, this panel antenna has the ability to be used for polarization diversity. This is in antenna technology. Another concept is: the so-called "electric short antenna, which is $' where the length of the electrical conductor of this antenna is physically short, and the antenna field is shorter than this antenna resonance. The wavelength of the frequency. Again, the edge of such a short line is a reduced size, which is particularly useful in the field of RFID tags or identifier antennas. :,,; and such a normal microstrip patch antenna still needs to be some The size of the signal is transmitted at a characteristic resonant frequency. This is particularly desirable to reduce the size of such an antenna attached to a device for tracking purposes. Therefore, an embodiment of the present invention aims to reduce the planar antenna. According to one aspect of the present invention, the present invention provides a dielectric antenna for transmitting a data antenna. The antenna includes a dielectric layer separated from a conductive layer. One of the dielectric layers of 200818606, wherein The conductive layer has a first portion connected to the capacitive element. The capacitive element advantageously makes the planar antenna appear to be electrically longer than the physical. This means that the antenna can be reduced At the same time, the antenna can still be operated at the same frequency. In addition, another advantage of the planar antenna is that the operating frequency of the antenna can be changed in inverse proportion to the value of the capacitive element. Therefore, for the antenna of the given size, The resonant frequency is reduced by increasing the value of the capacitive element. Wherein the capacitive element is preferably a plurality of capacitors. The plurality of capacitors are advantageously equally spaced to produce a more uniform electromagnetic field radiated by the edge of the antenna. 'The first part is preferably the first edge of the rectangular panel antenna. The 'the conductive layer preferably has a second portion connected to the ground plate. The antenna preferably forms the RFID attached to an object. One part of the label is such that the movement of the object can be tracked. According to another aspect of the present invention, a rectangular panel antenna comprising: a grounding plate electrically grounded; a conductive layer having an electrical conductor; a dielectric layer separating the ground plate from the conductive layer; and wherein the conductive layer has: a first edge connected to the ground layer; A second edge of a plurality of capacitors for enhancing edge capacitance. According to another aspect of the present invention, there is provided a rectangular panel antenna comprising: a grounding plate electrically grounded; a conductive layer having an electrical conductor; and a grounding plate a dielectric layer separate from the conductive layer; and wherein the conductive layer 7 200818606 has a first-and second-radiation edge' each having a plurality of capacitors for reluctance of its edge capacitances. 1 shows a plan view of the basic panel antenna, and Figure 2 shows a side view of the antenna. In particular, the panel antenna shown in Figure i has a circular shape, but it should be understood that the panel antenna can also have other shapes, such as square
形或矩形形狀。的確’ 3所顯示此根據本發明較佳實施 例之平板天線包括矩形形狀之部份。 圖1與2顯示一平板天線具有：位於底部之接地板元 件100:位於此接地板上之介電I 14〇;以及位於此介電 層上之導電層110。在實際上’此平板天線通常是印刷在 電路板上’且具有在半球體區域中接地板上任何方向中之 一輻射圖案。 此介電層140之厚度決定導電層n〇與接地板元件ι〇〇 所分開之距離’而此會影響平板天線之頻寬。通常，此介 電層越厚，則此頻寬越大。 可以減小此平板天線之尺寸，但縮短導電層ΐι〇之長 度（即，此平板之物理尺寸）會影響其性能表現。因此，2 天線操作之共振頻率隨著天線尺寸減小而增加。 亦應瞭解在天線之物理尺寸與天線之共振頻率之間存 在相反之關係。這即是，如果此平板之尺寸減少，則其共 振頻率會增加，反之亦然。 當對於某種共振頻率設計此種平板天線時之取捨係 為，性能表現經常隨著此平板尺寸之減少而劣化，但對於 8 200818606 RFID應用而言，令人想要盡可能減少此平板天線之尺寸， 而同時仍然達成適當之性能表現。 圖3顯示此根據本發明較佳實施例平板天線幾何形狀 之展開圖。特定而言，此電性短的平板天線為一矩形平板 天線，其具有：一接地板3〇〇、一分開之介電基板34〇、以 及一頂部印刷層3 1 0。此頂層3 1 0包括天線之導體配置 320 ° 圖3顯示此頂層3 10之一邊緣35〇具有此等通孔，其 可以被電性連接至接地板300。例如，可以將此等金屬通 孔設置於形成於此介電層中之各此等孔中，而將此頂部導 電層310之一邊緣350連接至接地板3〇〇，以有效地將此 天線之邊緣短路至接地。此頂層3 10亦顯示額外地包括： 位於沿著頂層相對邊緣360之複數個電容器Cl、C2、C3、 C4、C5、以及C6。此等電容器增加此平板天線之邊緣電 容。此在圖3中所顯示之複數個電容器c 1至C6彼此並聯。 根據本發明之一實施例，各此等電容器C1至C6藉由 以下方式而連接至此平板：將各電容器之一個板接地，且 將其另一板連接至導電層310。此電容器之各板可以藉由 將此板連接至相關通孔而接地，此通孔經由在此介電層中 之相關孔3 9 5 (例如，參考圖9與1 3)而安裝，且連接至接 地板300。 根據圖3之實施例，此等電容器c 1至C6如同此RF 饋進點3 7 0，是位於此平板之相同側上。此等電容器沿著 平板表面之饋進點370邊緣相等間隔地設置。在此饋進點 9 200818606 之各側上設有一個以上之電容器，以致於電流沿著此平板 天線之邊緣3 6 0均勻地分佈。此有利地允許用於天線之均 勻電磁場分佈。 介電層340之厚度為K6mm，且具有使用阻抗匹配而 定位設置之RF饋進點。 圖6至9顯示一實施例，其中導電層3丨〇之一邊緣短 路至接地板（如同在圖3之實施例中所顯示），而圖1〇至13 顯示一替代實施例，其中，此兩個相對邊緣具有所連接之 電容器（即，並無邊緣接地）。 特定而言，圖6顯示圖3具有一邊緣短路之平板天線 實施例之立體圖。圖6界定各種尺寸，例如，導電層31〇 之長度L與寬度W，以及介電層34〇之厚度h。 圖7顯示此在圖3中所示天線實施例之側視圖，且尤 其顯示其一側短路至接地，而在另一側上此等邊緣場產生 一負責輻射場之邊緣電容。圖7亦說明在此平板天線下電 磁場之分佈。藉由將集中式電容器添加至此未接地之邊 緣’可以人工方式增加邊緣電容，因而增加此終端效應延 伸，而使得可以減少此平板天線之物理尺寸。 圖8顯示此具有一邊緣短路之縮短矩形平板天線之傳 輸線模式。 L〇為平板天線之長度，z 焱亚士Shape or rectangular shape. Indeed, the panel antenna according to the preferred embodiment of the present invention includes a rectangular shaped portion. 1 and 2 show a planar antenna having: a ground plane component 100 at the bottom: a dielectric I 14 位于 on the ground plane; and a conductive layer 110 on the dielectric layer. In practice this flat panel antenna is typically printed on a circuit board and has a radiation pattern in any direction on the ground plane in the hemispherical region. The thickness of the dielectric layer 140 determines the distance separating the conductive layer n〇 from the ground plane component ι and this affects the bandwidth of the planar antenna. Generally, the thicker the dielectric layer, the larger the bandwidth. The size of the panel antenna can be reduced, but shortening the length of the conductive layer (i.e., the physical size of the panel) can affect its performance. Therefore, the resonant frequency of the 2-antenna operation increases as the antenna size decreases. It should also be understood that there is an inverse relationship between the physical size of the antenna and the resonant frequency of the antenna. That is, if the size of the plate is reduced, its resonance frequency will increase, and vice versa. When designing such a panel antenna for a certain resonant frequency, the performance is often degraded as the size of the panel decreases, but for the 8 200818606 RFID application, it is desirable to minimize the panel antenna. Dimensions while still achieving the proper performance. Figure 3 shows an expanded view of the geometry of a planar antenna in accordance with a preferred embodiment of the present invention. Specifically, the short planar antenna is a rectangular flat panel antenna having a ground plate 3A, a separate dielectric substrate 34A, and a top printed layer 310. This top layer 310 includes the conductor arrangement of the antenna 320 °. Figure 3 shows that one of the edges 35 of the top layer 3 10 has such vias that can be electrically connected to the ground plane 300. For example, the metal vias may be disposed in each of the holes formed in the dielectric layer, and one edge 350 of the top conductive layer 310 is connected to the ground plate 3〇〇 to effectively the antenna. The edge is shorted to ground. The top layer 3 10 is also shown to additionally include: a plurality of capacitors C1, C2, C3, C4, C5, and C6 located along opposite edges 360 of the top layer. These capacitors increase the edge capacitance of the panel antenna. The plurality of capacitors c 1 to C 6 shown in FIG. 3 are connected in parallel with each other. In accordance with an embodiment of the present invention, each of these capacitors C1 through C6 is coupled to the plate by grounding one of the plates and connecting the other plate to the conductive layer 310. The plates of the capacitor can be grounded by connecting the plate to an associated via, the via being mounted via an associated via 395 in the dielectric layer (e.g., with reference to Figures 9 and 13), and connected To the ground plate 300. According to the embodiment of Fig. 3, the capacitors c1 to C6 are located on the same side of the plate as the RF feed point 370. These capacitors are equally spaced along the edge of the feed point 370 of the flat surface. More than one capacitor is provided on each side of this feed point 9 200818606 such that current is evenly distributed along the edge 360 of the flat antenna. This advantageously allows for a uniform electromagnetic field distribution for the antenna. Dielectric layer 340 has a thickness of K6 mm and has an RF feed point that is positioned using impedance matching. Figures 6 through 9 show an embodiment in which one of the edges of the conductive layer 3 is shorted to the ground plane (as shown in the embodiment of Figure 3), while Figures 1A through 13 show an alternative embodiment, wherein The two opposite edges have connected capacitors (ie, no edge ground). In particular, Figure 6 shows a perspective view of the embodiment of the planar antenna of Figure 3 having an edge short circuit. Figure 6 defines various dimensions, such as the length L and width W of the conductive layer 31, and the thickness h of the dielectric layer 34A. Figure 7 shows a side view of the embodiment of the antenna shown in Figure 3, and particularly showing that one side is shorted to ground, and on the other side these edge fields produce an edge capacitance responsible for the radiation field. Figure 7 also illustrates the distribution of the electromagnetic field under this panel antenna. The edge capacitance can be artificially increased by adding a concentrated capacitor to this ungrounded edge, thereby increasing this end effect extension, thereby making it possible to reduce the physical size of the panel antenna. Fig. 8 shows the transmission line mode of the shortened rectangular panel antenna having an edge short circuit. L〇 is the length of the flat antenna, z 焱士士
〇為平板天線之特性阻抗，C 為邊緣電容’以及G為輻射雷道 ,,m 耵電蜍。此用於半波長矩形平板 天線之之長度L0可以使用下式計算： 10 200818606 2V?e A 0 式⑴ 其中L0為以公尺矣一 A尺表不之平板長度， £r為基板之相對介電常數， 又為以公尺表示之在自由空間中之波長，以及 △L 一為以公尺表示之終端效應延伸。 此經縮短1 /4油暴 一半 反長之平板天線僅為半波長天線長度之 〇 此終端效應延仲蚀彡曰 _ 甲使传此平板天線在電性上看來較其實 際上為長。因為此效應’此平板天線之物理長度猶短於^ 波長。然而’在操作頻率（即，共振頻率），其電性長度正 好為1 / 4波長。 此終端效應延伸與在電容性邊緣35〇之電容量直 接有關，且可以由以下函數代表： 式（2) △ L= arctan(C6>Zn) β 其中 C為以法拉第所表示之平板邊緣電容， ω為以挺/ s所表示之操作頻率，以及 Ζ〇為以歐姆表示之平板特性阻抗。 藉由以集中式（lumped)元件電容器（ci至C6)以人工方 式增加電容，式2建議此終端效應延伸將會變得更大，因 此減少此平板之物理長度。此效應顯示於圖14a與1 4b中， 其顯示此由上觀之的平板（即，平面圖）。此實線代表此平 板天線之物理長度（即，如同所製成），而虛線代表此平板 200818606 天線之電性長度。 圖14 a顯示將平板天線之尺寸減少而未添加任何電 容，而圖l4b顯示此平板之物理尺寸（長度）可以藉由在邊 緣3 60上增加電容而進一步減少。這即是，藉由對電路增 加電容，而可以戲劇性地減少此天線之物理長度（尺寸）， 而同時仍然維持其1/4波長之電性長度。或者，以另一種〇 is the characteristic impedance of the panel antenna, C is the edge capacitance 'and G is the radiation trajectory, m 耵 耵. The length L0 of the half-wavelength rectangular panel antenna can be calculated by the following formula: 10 200818606 2V?e A 0 Equation (1) where L0 is the length of the plate with a meter 矣A scale, and £r is the relative of the substrate. The electrical constant is also the wavelength in free space expressed in meters, and ΔL is the terminal effect extension expressed in meters. This shortened 1 / 4 oil storm. Half of the long-length flat-panel antenna is only half-wavelength antenna length. 〇 This terminal effect is delayed by 彡曰 _ _ A. This panel antenna is electrically longer than it actually is. Because of this effect, the physical length of this panel antenna is still shorter than the ^ wavelength. However, at the operating frequency (i.e., the resonant frequency), its electrical length is exactly 1/4 wavelength. This terminal effect extension is directly related to the capacitance at the capacitive edge 35〇 and can be represented by the following function: Equation (2) △ L = arctan(C6>Zn) β where C is the plate edge capacitance expressed in Faraday, ω is the operating frequency expressed as tha/s, and Ζ〇 is the characteristic impedance of the slab in ohms. By artificially increasing the capacitance in a lumped element capacitor (ci to C6), Equation 2 suggests that this end effect extension will become larger, thus reducing the physical length of the plate. This effect is shown in Figures 14a and 14b, which shows the plate (i.e., plan view) from the top. This solid line represents the physical length of the planar antenna (i.e., as made), and the dashed line represents the electrical length of the flat panel 200818606 antenna. Figure 14a shows that the size of the panel antenna is reduced without adding any capacitance, while Figure 14b shows that the physical size (length) of the panel can be further reduced by adding capacitance to the edge 360. That is, by adding capacitance to the circuit, the physical length (size) of the antenna can be dramatically reduced while still maintaining its electrical length of 1/4 wavelength. Or, in another
方式而言，此在特定共振頻率操作之平板天線之尺寸，可 以藉由增加電容而大幅減少。 此連接至饋進點3 7 0 ’之]套縫且古给 λ ^ ^ α急遭緣具有第一組電容器13〇〇，以及 其相對邊緣具有第二組電容器1 3丨〇。 圖10至13顯示替代實施例，其中此兩個相對邊緣具 有所連接之電纟器。$即是w 1G_此平板天線之立體 圖，其中，此導電層310,邊緣並未接地。反而是，此具有 長度W之導電層31〇,之兩個邊緣均具有所連接之複數個電 谷益。此在圖10中並未顯示，但顯示於圖13中，其中， 因此’此平板之兩個邊緣具有電容性邊緣，且此 [圖11巾’其顯示由此兩個邊緣所輻射之電磁場。此電 磁場之分佈朝此平板之中心逐漸減少。圖i”員示用於此 實施例之等效傳輸線圖，而此兩個邊緣均為電容性邊緣。 應瞭解此可以延伸至各種平板幾何形狀，其包括但並 不限於此經縮短之1/4波長平板天線。 對於在此所說明之平板天線幾何形狀可以有複數個不 同應用與使用領域。此等應用與使用領域之_些包括： -在任何RF點-至-點之連接系統中， 12 200818606 _在任何RF點-至_多點之連接系統中， -任何RFID標籤、不論其為被動或主動式標籤， -任何RF發射器、接收器及/或發射接收器， -任何具有此射頻鏈路中繼資料之感測器應用。 此根據本發明實施例之平板天線以兩個階段設計。 在第一階段中，使用電磁模擬軟體，例如：Sonnet I·、Microware Studi〇等，以模擬天線所想要之頻率響 匕圖？員示使用相關模擬套裝之天線所想要之頻率響應。 特定而言’圖4顯示在大約435MHz所產生之共振頻率。 藉由增加此等電容器C1 i C6之值，而可以降低此天 線之共振頻率。 =5為根據較佳實施例之小平板天線之相同模擬之進 一步呈現’但圖4顯示頻率響應。圖5顯示阻抗圖。 天線计之第二階段涉及製作天線之原型，其例如可 以使用平常RF_4 PCB材料而建構。然後將此天線校準， 且其良好之設計準則為：此平板元件越小，則天線須要更多 電容以在所想要之共振頻率運作。 有關於性能表現之改良，可以考慮一個例子，此特 定尺寸經縮短1/4波長之平板天線具有大@ 2GHz之共振 頻率。相對的，此相同尺寸平板天線、但具有在其邊緣上 所導入之集中式電容器，彳以在大幅降低之共振頻率操 作，而在圖4之圖中所顯示之情形中減少大約5倍。特定 而b，圖4顯不具有集中式電容器之平板天線之頻率響應， 其所具有共振頻率為大約435MHz之40。 13 200818606 應瞭解雖然圖3之較 平;^夭绩甘仙 佳貝鈀例棱供實質上矩形形狀之 十板天線，其他形狀亦為可能。 【圖式簡單說明】 之實施例 〇 藉由舉例且參考後_式而制本發明 圖1顯*基本平板天線之平面圖； 圖2顯示平板天線之側視圖； 圖 顯示根據本發明第一 實施例之平板天線之立體In this way, the size of the planar antenna operating at a particular resonant frequency can be substantially reduced by increasing the capacitance. This is connected to the slot of the feed point 3 7 0 ' and the λ ^ ^ α has a first set of capacitors 13 急 and its opposite edge has a second set of capacitors 1 3 丨〇. Figures 10 through 13 show an alternate embodiment in which the two opposite edges have connected electrical switches. $ is a perspective view of the w 1G_ flat panel antenna in which the conductive layer 310 is not grounded. Rather, the conductive layer 31 has a length W, both of which have a plurality of connected electrons. This is not shown in Figure 10, but is shown in Figure 13, where, therefore, the two edges of the plate have capacitive edges, and this [Fig. 11 towel] shows the electromagnetic field radiated by the two edges. The distribution of this electromagnetic field gradually decreases toward the center of the plate. Figure i" shows the equivalent transmission line diagram for this embodiment, and both edges are capacitive edges. It should be understood that this can be extended to various flat panel geometries including but not limited to this shortened 1/ 4-wavelength panel antennas There are a number of different applications and fields of use for the planar antenna geometry described herein. Some of these applications and areas of use include: - in any RF point-to-point connection system, 12 200818606 _In any RF point-to-multipoint connection system, - any RFID tag, whether it is a passive or active tag, - any RF transmitter, receiver and / or transmitter receiver - any with this Sensor application for radio frequency link relay data. The panel antenna according to an embodiment of the present invention is designed in two stages. In the first stage, an electromagnetic simulation software such as Sonnet I·, Microware Studi, etc. is used. The desired frequency response of the analog antenna is shown by the frequency response desired by the antenna of the relevant analog set. In particular, 'Figure 4 shows the resonant frequency generated at approximately 435 MHz. The value of the capacitor C1 i C6 can be used to reduce the resonant frequency of the antenna. = 5 is a further representation of the same simulation of the small panel antenna according to the preferred embodiment 'but Figure 4 shows the frequency response. Figure 5 shows the impedance map. The second phase involves the fabrication of an antenna prototype that can be constructed, for example, using the usual RF_4 PCB material. The antenna is then calibrated and its good design criteria are: the smaller the plate component, the more capacitance the antenna needs to The desired resonant frequency operates. For an improvement in performance, consider an example where a panel antenna with a specified 1/4 wavelength reduction has a resonant frequency of @2 GHz. In contrast, this same size flat panel antenna, but With a concentrated capacitor introduced at its edge, 彳 operates at a greatly reduced resonant frequency, which is reduced by a factor of about 5 in the case shown in the diagram of Figure 4. Specific and b, Figure 4 shows no concentration The frequency response of the planar antenna of the capacitor has a resonant frequency of 40 435 MHz. 13 200818606 It should be understood that although Figure 3 is relatively flat; The Jiabei palladium case is provided with a substantially rectangular shape of a ten-plate antenna, and other shapes are also possible. [Embodiment of the drawings] Embodiments of the present invention are shown by way of example and with reference to the following: 2 is a side view of a panel antenna; FIG. 2 is a side view of a panel antenna according to a first embodiment of the present invention;
圖4顯不所想要天線頻率響應之圖式； 圖5顯示此天線之阻抗圖； 圖6顯示具有根據本發實施例所界定天線尺寸 體圖； 回”、、員示具有根據本發明第一實施例之電磁場之側視 圖8顯示根據本發明第一實施例之等效傳輸線電路； 圖9顯示根據本發明第一實施例包括此等電容器之平 板之立體圖； 圖10顯示根據本發明一替代實施例具有所界定尺寸天 線之立體圖； 圖11顯示本發明此替代實施例之電磁場之侧視圖； 圖12顯示本發明替代實施例之等效傳輸線電路； 圖丨3顯示包括此用於本發明替代實施例之電容器之平 板之立體圖； 圖l4a顯示當未將電容加至邊緣時平板尺寸之減少； 200818606 以及 圖14b顯示當添加電容時平板尺寸之減少。 【主要元件符號說明】 100 底部接地板元件 110 導電層 140 介電層 3 0 0 接地板 300’ 接地板 310 導電層 310’ 導電層 320 導體配置 340 介電基板 340’ 介電基板 350 邊緣 360 相對邊緣 370 射頻饋進點 370’ 射頻饋進點 395 孔 395’ 孔 13 00 第一組電容器 1310 第二組電容器 15Figure 4 shows a schematic diagram of the antenna frequency response; Figure 5 shows an impedance map of the antenna; Figure 6 shows a body size map having an antenna defined in accordance with an embodiment of the present invention; Side view 8 of an electromagnetic field of an embodiment shows an equivalent transmission line circuit according to a first embodiment of the present invention; FIG. 9 shows a perspective view of a panel including such capacitors according to a first embodiment of the present invention; FIG. 10 shows an alternative to the present invention. The embodiment has a perspective view of an antenna of a defined size; Figure 11 shows a side view of an electromagnetic field of this alternative embodiment of the invention; Figure 12 shows an equivalent transmission line circuit of an alternative embodiment of the invention; Figure 3 shows the inclusion of this alternative for the present invention. A perspective view of the plate of the capacitor of the embodiment; Figure 14a shows the reduction in the size of the plate when the capacitor is not applied to the edge; 200818606 and Figure 14b show the reduction in the size of the plate when the capacitor is added. [Key Symbol Description] 100 Bottom Ground Plate Element 110 conductive layer 140 dielectric layer 300 ground plate 300' ground plate 310 conductive layer 310' conductive layer 320 conductor configuration 340 Dielectric substrate 340' Dielectric substrate 350 Edge 360 Relative edge 370 RF feed point 370' RF feed point 395 Hole 395' Hole 13 00 First set of capacitors 1310 Second set of capacitors 15