2.4ghz双菱阵列天线

1、2.4GHz quad double quad2.4GHz四振元双菱阵列天线A simple quad double quad designt gives low SWR and high gain.低驻波比高增益一个简单的双菱阵列天线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设计的双菱阵列天线是一个创造性的，为 23mm和 13mm业余电视频段设计的，这个设计被估算、制作，然后用网络分析系统分析，确保其最佳性能。此设计基于 4 个菱形天线定相的组合在一起，这样每个天线的信号相加。这个天线的整体增益接近 16dB，稍稍低于单个双菱的 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.制作这个天线，先用一块 260mm230mm的双面PCB板，在水平和垂直面的中心点做好标记。见这两个图样，在标记的位置钻孔，供UT141 同轴电缆穿过，直接连接双菱天线的振子。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.在这个设计，我在天线背面留出 10mm 的同轴电缆供调整用。天线前面，双菱振子距离反射板 14mm，是用 1.8mm 粗的铜线制作的。当你焊接双菱振子时，要确保它们的姿势相同。即，接地连接在左面，中心导体连接在右面。这样做将会排除任何相位问题。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.接下来，切下 4 段各 80mm 长的 UT141 同轴电缆，每一端剥去 1.5mm 外皮，剩下长度 77mm 的外导体。它们将组成移项装置。把这些同轴电缆按照图示连接起来。这样连接的 2 个双菱将导致 25 欧姆的阻抗。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 欧姆接到 100 欧姆匹配段。切下 2 段 61mm 长的 UT141 同轴电缆，再次把每端剥去 1.5mm 外皮，剩下的外导体长度是 58mm。当然了，这样的 2 个并接的 100 欧姆的同轴电缆将导致 50 欧姆的阻抗。按照图

10、示把每一段（58mm 的电缆）连接到 77mm 电缆的接点上。再把两个 58mm 电缆的中心导线连接到 SMA 接头的中心接点。把这些线段的外皮和 SMA 头的底座焊接在一起，确保接地良好。If youe followed this design carefully, your antenna will performvery well and SWR.e an excellent match to 50ohms resulting in a low如果你仔细按照这个设计去做，你的天线会有很好的表现，有优秀的 50 欧姆匹配，导致驻波比很低。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（作者笔误，应为 sealant） to fix them onto the double sided PCB.这个天线曾成功地用于一个超过几公里远的阻塞的通道，波束宽度相当狭