2.4ghz雙菱陣列天線

1、2.4GHz quad double quad2.4GHz四振元雙菱陣列天線A simple quad double quad designt gives low SWR and high gain.低駐波比高增益一個簡單的雙菱陣列天線Wednesday, 7 August 20022002 年 8 月 7 日，星期三Written by: G4RFR ( FRARS )G4RFR ( FRARS )The G6NLC duad double quad antenna was inspired by designs for the 23cm and 13cm Amateur TV alloca

2、tions. This design has been scaled,built, and thenysed winetworkyser to ensure theperformance is optimum. The design is basically 4 double quadantennas phased together sucht the signal from each antenna isadded. The overall gain of this antenna is approaching 16dB, justunder four timest of a single

3、double quad.G6NLC設(shè)計的雙菱陣列天線是一個創(chuàng)造性的，為 23mm和 13mm業(yè)余電視頻段設(shè)計的，這個設(shè)計被估算、制作，然后用網(wǎng)絡(luò)分析系統(tǒng)分析，確保其最佳性能。此設(shè)計基于 4 個菱形天線定相的組合在一起，這樣每個天線的信號相加。這個天線的整體增益接近 16dB，稍稍低于單個雙菱的 4 倍。1To construct this antenna, start wi 260mm by 230mm. Mark the centpiece of double sided PCBs in both the horizontal andoverticle planes. Using the t

4、wo diagrams, mark and drill the holestwille the UT141 coax pushed through for connection to the doublequad elements.制作這個天線，先用一塊 260mm230mm的雙面PCB板，在水平和垂直面的中心點做好標(biāo)記。見這兩個圖樣，在標(biāo)記的位置鉆孔，供UT141 同軸電纜穿過，直接連接雙菱天線的振子。his design, I left 10mm of coax on the back of the antenna to provide adjustment if required. On

5、 the front of the antenna, the double quad elements are spaced 14mm from the ground plane, and they are made from copper wire 1.8mm thick. When soldering thedouble quad elements inition, ensure they are all facing the sameway. i.e. ground connection on the left, inner connection on the right. This w

6、ill eliminate any phasing problems.在這個設(shè)計，我在天線背面留出 10mm 的同軸電纜供調(diào)整用。天線前面，雙菱振子距離反射板 14mm，是用 1.8mm 粗的銅線制作的。當(dāng)你焊接雙菱振子時，要確保它們的姿勢相同。即，接地連接在左面，中心導(dǎo)體連接在右面。這樣做將會排除任何相位問題。Next, cut four pieof UT141 coax 80mm long, and strip 1.5mm ofouter from each end, leaving a total outside length of 77mm. These2will form part

7、of the phasing assembly. Follow the diagram as to theconnection of theseof coax. Connection of two double quads inparallel will result in an impedance of 25ohms.接下來，切下 4 段各 80mm 長的 UT141 同軸電纜，每一端剝?nèi)?1.5mm 外皮，剩下長度 77mm 的外導(dǎo)體。它們將組成移項裝置。把這些同軸電纜按照圖示連接起來。這樣連接的 2 個雙菱將導(dǎo)致 25 歐姆的阻抗。Next for the 25ohm to 100ohm

8、 matching sections, cut two pieof61mm UT141, again strip the outer back 1.5mm from each end to leave a outside length of 58mm. Of course 2 100ohm coaxs in parallel will result in an impedance of 50 ohms. Connect each piece to the joined 77mm lengths as per the diagram. Under the connector, both cent

9、re conductors from the 58mm lengths are connected to the centre pin of the SMA socket. Solder the outer of these lengths to the SMA socket body to ensure a good earth connection.下面把 25 歐姆接到 100 歐姆匹配段。切下 2 段 61mm 長的 UT141 同軸電纜，再次把每端剝?nèi)?1.5mm 外皮，剩下的外導(dǎo)體長度是 58mm。當(dāng)然了，這樣的 2 個并接的 100 歐姆的同軸電纜將導(dǎo)致 50 歐姆的阻抗。按照圖

10、示把每一段（58mm 的電纜）連接到 77mm 電纜的接點上。再把兩個 58mm 電纜的中心導(dǎo)線連接到 SMA 接頭的中心接點。把這些線段的外皮和 SMA 頭的底座焊接在一起，確保接地良好。If youe followed this design carefully, your antenna will performvery well and SWR.e an excellent match to 50ohms resulting in a low如果你仔細(xì)按照這個設(shè)計去做，你的天線會有很好的表現(xiàn)，有優(yōu)秀的 50 歐姆匹配，導(dǎo)致駐波比很低。This antenna has been susf

11、ully used in an obstructed path linkover a few kilometers. The beamwidth is fairly narrow and theantenna is low profile. To watroof, simply find an old plasticcontainert will go over the front and back parts and use siliconsealent（作者筆誤，應(yīng)為 sealant） to fix them onto the double sided PCB.這個天線曾成功地用于一個超過幾公里遠(yuǎn)的阻塞的通道，波束寬度相當(dāng)狹