A New Scheme to Enhance Bandwidth of Printed Dipole for Wideband Applications

A simple printed antenna with broadband property and omnidirectional radiation patterns of wire dipole

“…That is to say, the proposed antenna can maintain the features of wire dipole antenna over the entire resonant band. This is a very interesting and distinctive feature of the proposed antenna that differs from the other printed dipoles in [21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37].…”

“…To compare more in details the proposed antenna with the others in [21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37], we pick up several examples of printed dipole antenna from these references and conduct the comparison. Table II shows the statistical data of the printed dipole antennas in [21,25,29,33,37] and the proposed antenna in this work. These data include the normalized antenna size with respect to the wavelength λ at the minimum operation frequency of VSWR = 3, the fractional bandwidth for VSWR ≤ 3, the requirement of a balun in feeding, and the shapes of radiation patterns at resonant frequencies of each antenna.…”

“…The diversification of smart wireless devices in recent years has been the strongest motivation for the rapid development of various studies on printed antennas [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37]. Generally, these antennas can be categorized by the authors into several types such as patches [10,11,12], monopoles [13,14,15,16,17,18,19,20], or dipoles [21,22,…”

“…On the other hand, when dealing with these antennas, designers may be possible to obtain dual polarization [4,5,35], low cross polarization [13,26], or a desired radiation pattern [20,36], but in most works as listed in References, designers often try to increase the antenna's resonant bandwidth by adjusting the shapes of conductor parts on the substrate. Concerning the type of printed dipole antennas [21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37], although antenna models in these works can provide impressive bandwidth enhancement, other features of some of them may disappear or be unsuitable in 1 Dept. of Radar Technology, Le Quy Don Technical University, 236 Hoang Quoc Viet, Hanoi, Vietnam 2 Dept.…”

“…of Electrical and Electronic Engineering, National Defense Academy, 1-10-20 Hashirimizu, Yokosuka, Kanagawa 239-8686, Japan a) hungnt1985_k31@lqdtu.edu.vn some particular applications. For example, the antennas in [22,24,26,27,31,32,33,34,36] lose the omnidirectional radiation pattern which is one of the most distinctive feature of an original wire dipole antenna, or those in [21,25,29,32] need an additional balun for balanced feeding. For applications in which omnidirectional radiation pattern in a wide frequency band and the elimination of balun are required, the antenna proposed in this letter can be a good option for designers to choose.…”