Multiband antenna

Another recently proposed multiband antenna by Chen et al. [33] is capable of operating also in a third band located around 4.725 GHz, in addition to the two considered ISM bands. This is achieved by a modified Lf-slot topology for the patch, implemented in silver-coated nylon RIPSTOP fabric, on a flexible dielectric foam as a substrate material, with a ground plane on the bottom side. 

Embroidered multiband antenna for body-worn GSM/PCSAAfLAN communications... 

In this section, we designed a flexible multiband antenna based on the aforementioned embroidered textiles. The proposed antenna operates at Global System for Mobile Communications (GSM 850/900 MHz), Personal Communications Service (PCS 1800/ 1900 MHz), and Wireless Local Area Network (WLAN 2450 MHz) bands. As demonstrated in Wang et al. (2014), an important aspect of this antenna is the loaded loop. 

We further considered the cross-polarized radiation of the multiband antenna, because polarization mismatch is unavoidable due to the individual s movements. As shown in Figure 10.25, the shoulder-mounted antenna stUl provides coverage in cross-polarization operation. This is because the antenna s surface shared the shoulder and arm sections of the body. The shoulder-mounted antenna did provide a good... 

FIGURE 9.3 Multiband antenna for smartphones (graphics courtesy of TE Connectivity)... 

Besides the application of micromirror arrays, nickel surface micromachining with a copper sacrificial layer is a technology that can be used for various microfabrication concepts. Only recently, the method has been applied for the construction of capacitive RF switches for antenna impedance matching in multiband mobile phones [26]. 

S. R. Best, A multiband conical monopole antenna derived from a modified Sierpiriski gasket, IEEE Antennas Wireless Propag. Lett., vol. 2, no. 1, pp. 205-207, 2003. doi 10.1109/LAWP.2003.819665... 

A tapered periodic surface (TPS) is an array of wire or slot type elements with element sizes and interelement spacings that vary as a function of position over the array. Many different appUcations of TPS come to mind. Most of these applications involve a smooth electrical transition to terminate the finite edge of an FSS or phased array. A TPS could also be used to transition from one FSS design to another in a radome with multiband window areas. Another application is as a building block for broad band and low side lobe antenna designs. Tapered Periodic Surfaces exhibit two fundamental properties ... 

Figure 10.22 (a) Embroidered multiband textile antenna using E-fibers, and measured and simulated RF performance of the textile antenna in free space (b) Sll, (c) realized gain, and (d) radiation patterns. 

Figure 10.23 Measured and simulated radiation pattern of the multiband textile antenna in free space.

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