Abstract
A novel Koch fractal printed Yagi-Uda antenna fed by coplanar waveguide (CPW) is proposed and analyzed. The antenna has first-order Koch fractal monopoles, and the monopoles' ground plane acts as the ground plane of the antenna. The radiation characteristics of the antenna are simulated by CST Microwave Studio® and explained by the simulated results. The antenna's currents distribution becomes more uniform after being fractal, which is conducive to increasing antenna's radiation directivity. The proposed Koch fractal Yagi-Uda antenna has an operating band of 885-913MHz (relative bandwidth 3.1%) with the center frequency of 900 MHz. The total antenna size is 171mm × 85mm (0.51λ × 0:25λ) and the length in the antenna's polarization direction is only 25% of the wavelength corresponding to the center frequency. Compared to traditional Yagi-Uda antenna, the proposed antenna can achieve a 50% miniaturization effect.
| Original language | English |
|---|---|
| Pages (from-to) | 67-79 |
| Number of pages | 13 |
| Journal | Progress in Electromagnetics Research C |
| Volume | 33 |
| DOIs | |
| State | Published - 2012 |
| Externally published | Yes |
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