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This paper presents a two-notch antenna cut on a small ground plane excited out of phase to a radiate horizontally polarized omnidirectional pattern. The radiating modes of this antenna is evaluated by characteristic modes analysis to obtain omni-pattern. The second mode provides a loop current in horizontal plane, radiating omni-pattern with small ripples. To improve the uniformity of pattern, this...
This paper presents two-notch antenna consisting of I-shaped ground plane and microstrip feeding lines excited out of phase. Its radiation pattern is omni- or bi-directional in E plane by changing the antenna geometry. Antenna pattern control of this notch antenna is discussed in this paper based on the geometry optimization by characteristic modes analysis. Three symmetrical modes are excited by...
Radiation pattern adjustment of a double notched antenna is discussed in this paper to show a way of applying characteristic modes analysis for antenna parameter optimization. In this example, radiation pattern of the antenna is adjusted to omni-directional type and bi-directional type, respectively, by changing responses of two different characteristic modes of the antenna.
Characteristic modes analysis of a 4G cellular antenna which operates in LTE, GSM, DCS, PCS and 2.4GHz WLAN standards for an eyewear wireless devices is presented. In previous work, the antenna was designed as capacitive coupling element feeding type, using a printed circuit board (PCB) of FR4 substrate. The antenna operates at 700–960 MHz and 1.7–2.7 GHz frequency bands and complies with all the...
Two adjacent planar inverted-F antenna (PIFA) elements are used for a beam switchable antenna. But strong mutual coupling between the two closely arranged PIFA elements cannot be ignored. A shorted line connecting the two PIFAs is proved useful to provide neutralizing effect to reduce the mutual coupling. Optimized arrangement of PIFAs and the shorted line is shown, and the theory of characteristic...
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