sma splitter 2 way.Omnidirectional antenna monopole

　　1.1 Microstrip fed monopoles. The planar monopole antenna has a simple structure and a nearly omnidirectional radiation pattern, and is widely used in communication, as shown in the monopole antenna in the following figure. The biggest difference of this antenna lies in the deformation of the ground. The ground of a conventional antenna is often the size of the entire medium, while the ground of this monopole is only half of the medium, and one side is made up of an ellipse and a triangle. The ratio of the long and short half axes of the ellipse is 1.8, and the monopole is also an ellipse, with a ratio of the long and short half axes of 1.2. The entire antenna is fed by microstrip, and the ground width W and the length h of the feeding gap are the main parameters that affect antenna performance.

　　1.2 Coplanar waveguide fed monopole antenna. One of its characteristics is the use of coplanar waveguides for feeding. Compared with traditional microstrip lines, coplanar waveguides have two major advantages: low offset at high frequencies and wide impedance bandwidth. Another characteristic is that the radiation unit adopts hexagonal patches, which have inherent advantages in broadband characteristics compared to other rectangles, squares, and triangles. The entire antenna feeding part is achieved by opening holes on the upper and lower sides of the grounded coplanar waveguide, creating a short circuit between the upper and lower layers, thereby preventing the generation of parasitic modes. The number of holes can also change the input impedance of the antenna. From the figure, it can also be seen that the ground beneath the hexagonal patch has been removed, which can promote radiation from the wide edge at the bottom. By adjusting the width of the feed line and the gaps on both sides of the feed line, a good match can be achieved, which also makes it easy for the antenna to achieve impedance matching.

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