Abstract
In this article, a wideband filtering-radiating Yagi dipole antenna with the coplanar stripline (CPS) excitation form is investigated, designed, and fabricated. By introducing an open-circuited half-wavelength resonator between the CPS structure and dipole, the gain selectivity has been improved and the operating bandwidth is simultaneously enhanced. Then, the intrinsic filtering-radiating performance of Yagi antenna is studied. By implementing a reflector on initial structure, it is observed that two radiation nulls appear at both lower and upper gain passband edges, respectively. Moreover, in order to improve the selectivity in the upper stopband, a pair of U-shaped resonators are employed and coupled to CPS directly. As such, the antenna design is finally completed with expected characteristics. To verify the feasibility of the proposed scheme, a filtering Yagi antenna prototype with a wide bandwidth covering from 3.64 GHz to 4.38 GHz is designed, fabricated, and measured. Both simulated and measured results are found to be in good agreement, thus demonstrating that the presented antenna has the performances of high frequency selectivity and stable in-band gain.
Highlights
There is an increasing demand for RF front end to possess much more potential characteristics for application in modern wireless communication systems, such as compact structure, low cost, high efficiency, multiple functions, and so on
Antennas with unidirectional radiation are much more practical in some modern wireless communication systems [8,9,10,11,12,13,14], such as missiles, aircrafts, and vehicles. To accommodate to this tendency, Yagi antennas have been widely used as a kind of classical structure since its original design and operating principles were first described by Uda and Yagi [15,16]
Multimode balun bandpass filter was directly integrated into the antenna so as to achieve filtering performance
Summary
There is an increasing demand for RF front end to possess much more potential characteristics for application in modern wireless communication systems, such as compact structure, low cost, high efficiency, multiple functions, and so on. Antennas with unidirectional radiation are much more practical in some modern wireless communication systems [8,9,10,11,12,13,14], such as missiles, aircrafts, and vehicles To accommodate to this tendency, Yagi antennas have been widely used as a kind of classical structure since its original design and operating principles were first described by Uda and Yagi [15,16]. As demonstrated in [20],As thedemonstrated out-of-band gain suppression of Yagi antenna can be improved by filtering performance itself. In [20], the out-of-band gain suppression of Yagi optimizing the length and spacing of directors and reflectors, while narrowing the operating bandwidth antenna can be improved by optimizing the length and spacing of directors and reflectors, while compared the conventional counterpart.
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