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1、2.4GHz 42.4GHz 4 振元双菱阵列天线 振元双菱阵列天线 2.4GHz quad double quad 2.4GHz 四振元双菱阵列天线 A simple quad double quad design that gives low SWR and high gain. 低驻波比低驻波比 高增益高增益 一个简单的双菱阵列天线一个简单的双菱阵列天线 Written by: G4RFR ( FRARS ) Wednesday, 7 August 2002 G4RFR ( FRARS ) 2002 年年 8 月月 7 日，星期三日，星期三 The G6NLC duad double q
2、uad antenna was inspired by designs for the 23cm and 13cm Amateur TV allocations. This design has been scaled, built, and then analysed with a network analyser to ensure the performance is optimum. The design is basically 4 double quad antennas phased together such that the signal from each antenna
3、is added. The overall gain of this antenna is approaching 16dB, just under four times that of a single 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。 March，2010 1 2.4GHz 42.4GHz 4 振元双菱阵列天线
4、振元双菱阵列天线 To construct this antenna, start with a piece of double sided PCB 260mm by 230mm. Mark the center points in both the horizontal and verticle planes. Using the two diagrams, mark and drill the holes that will have the UT141 coax pushed through for connection to the double quad elements. 制作这个
5、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。 In this design, I left 10mm of coax on the back of the antenna to provide adjustment if required. On the front of the antenna, the double quad elements are spaced 14mm from the ground plane, and they are made from
6、 copper wire 1.8mm thick. When soldering the double quad elements in position, ensure they are all facing the same way. i.e. ground connection on the left, inner connection on the right. This will 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
7、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 pieces of UT141 coax 80mm long, and strip 1.5mm of outer from each end, leaving a total outside length of 77mm. These March，2010 2 2.4GHz 42.4GHz 4 振元双菱阵列天线 振元双菱阵列天线 will form part of the phasing assembly. Follow the diagram as to
8、 the connection of these pieces of coax. Connection of two double quads in parallel 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 matching sections, cut two pieces
9、of 61mm 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 centre conductors from the 58mm le
10、ngths 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。按照图示把每一段（58mm 的 电缆）连接到 77mm 电缆
11、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 you have followed this design carefully, your antenna will perform very well and have an excellent match to 50ohms resulting in a low SWR. 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 sucessfully use
12、d in an obstructed path link over a few kilometers. The beamwidth is fairly narrow and the antenna is low profile. To waterproof, simply find an old plastic container that will go over the front and back parts and use silicon sealent （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 窄，天线不引人注目。至于防水，简单地找一个旧塑料容器，分开前面和背面， 用硅密封胶把它们分别粘在 PCB 的两面上。 Thanks go to Jan - SM3JJI for spotting the obvious mistake! 感谢 Jan - SM3JJI 检查出的明显错误。 激情无线（lijiqing）翻译 2009年 10 月 2010年 3月修订 March，2010 3
