Flexible and Conformal Printed Monopoles Antennas

Abstract

Abstract-This paper presents the development and design of flexible and conformal printed monopoles antennas. The main objective is to control the level of radiation in broadside antenna from zero to a maximum by changing the curvature of printed board. Two printed antennas types are considered: thin wire and disk monopole. Furthermore, with the curving radius R increasing, the classical null on the broadside radiation pattern disappears gradually for both wire and disk. Increasing the curvature radius of conformal flexible antenna while keeping all other parameters same, wire monopole antenna becomes mismatched while the disk monopole antenna which remains matched for all radius of curvatures. The simulated results of various monopoles are compared successfully with measurements.

Flexible polymer/fabric fractal monopole antenna for wideband applications

“…We see that the proposed antenna has better radiation efficiency than [4, 6, 21] and broader bandwidth than [4, 32]. Also, the proposed antenna has better maximum gain compared to the antenna in References [19, 21, 31, 32] and small size than [4, 6, 16].…”

“…However, the elongation at break of the proposed natural rubber composite filled by SiO 2 is bigger than that of the natural rubber-based composite filled with carbon black at the same filler content [33]. In addition, the elongation of the composites with SiO 2 exceeds significantly that of the materials used as flexible substrates in wideband antennas [4,16,19,21,32]. A comparison of the parameters and characteristics of the proposed antenna with other similar fractal monopole antennas recently reported in the literature is given in Table 4 to highlights the improvement and novelty of the antenna structure.…”

“…Moreover, to demonstrate excellent mechanical flexibility of the proposed substrate the elongation at break of the composite was characterized according to ISO 37:20020 and EN 12803 and compared (see Table 3) with this of materials used as substrates in References [4,16,19,21,32] and a natural rubber-based composite filled with carbon black at the same filler content (30 phr) [33]. The mechanical properties were determined using 78 mm double-sided test specimens having a working area of 20 mm in length and 4 mm in width.…”

“…The shift from rigid to flexible and bendable antennas imposes the employment and investigation of different alternative conductive and substrate materials [4,5]. Bendable materials such as conductive fabrics [6][7][8], liquid metal alloys [9], conductive fibres on textiles [10], polymer composites [1,4,6,8,[11][12][13][14][15][16][17] and paper [18] have been widely used in current designs of flexible antennas. Various types of flexible antennas have been reported in the literature during the last years including monopoles [4,6,14,[19][20][21], dipoles [20], slot antennas [22], electromagnetic band gap backed monopole [23] and yagi-uda antennas [24], dipoles with a rectangular reflector [11,13], artificial magnetic conductor surface backed Yagi antennas [25] and patch antennas [8,15].…”

Compact UWB flexible elliptical CPW‐fed antenna with triple notch bands for wireless communications

“…But the reported antennas [2][3][4][5][6][7][8][9][10][11][12][13] are rigid planar types and they cannot be mounted on curved terminals. So, the researchers have focused on the design techniques for flexible antennas [14][15][16] since it offers low mass density, small volume, and most importantly wide adaptability. Additionally, the flexible UWB antenna has become a very popular choice as it can enable UWB and other wireless systems to be used on curved surfaces.…”