Bandwidth enhancement of coupled‐fed on‐board printed PIFA using bypass radiating strip for eight‐band LTE/WWAN slim mobile phone

Abstract

By connecting a bypass radiating strip to the radiating portion of a coupled‐fed on‐board printed PIFA (planar inverted‐F antenna), significant bandwidth enhancement can be obtained.The bypass radiating strip provides a bypass for the excited surface currents of the printed PIFA, which leads to more uniform surface current distributions on the printed PIFA. This behavior can result in slow variations in the antenna's input impedance over the operating bands, which makes it very promising to achieve improved impedance matching; thus, enhanced bandwidths of the printed PIFA are obtained. In this study, with a small footprint to be printed on the no‐ground portion of 15 × 48 mm2 in the system circuit board of the mobile phone, the proposed on‐board printed antenna is especially suitable for slim mobile phone applications and can generate two wide operating bands to respectively cover the LTE700/GSM850/900 operation (698–960 MHz) and the GSM1800/1900/UMTS/LTE2300/2500 operation (1710–2690 MHz). The proposed antenna held by the user's hand and attached to the user's head is also tested for its SAR values over the eight operating bands. Measured and simulated results are presented. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 2059–2065, 2010; Published online in Wiley InterScience (www.interscience. wiley.com). DOI 10.1002/mop.25406

Body SAR study of the planar WWAN monopole slot antenna for tablet device application

“…The input power at each frequency is 0.25 Watt (24 dBm) at 859 and 925 MHz for GSM850/900 operation and 0.125 Watt (21 dBm) at 1795, 1920, and 2045 MHz for GSM1800/1900/UMTS operation. The input power is the same as that used for obtaining the head SAR for the internal handset antennas [16][17][18][19][20][21][22]. The SAR values for the three conditions all meet the limit of 1.6 W/kg.…”

Bandwidth Enhancement of CPW-Fed Elliptical Curved Antenna with Square SRR

“…To improve the gain and directivity of the antenna, recently new types of composite structures are going to be used in the design. These new materials are called as metamaterials [7][8]. Metamaterials are engineered to provide material characteristics that cannot be found in nature.…”

Wideband Coupled Loop Antenna for Laptop PC Sensor Network Applications

“…Recently, the dominant operating bands of the most popular laptop devices have been the long term evolution (LTE)/wireless wide area network (WWAN), which operates for 2G, 3G, and 4G applications. (1)(2)(3) The operating bands of LTE include 698-960, 1710-2690, and 3400-3800 MHz. For the GSM850/900, distributed control system (DCS), process control system (PCS), and universal mobile tellecommunications system (UMTS) standards, the operating bands are 824-960 and 1710-2170 MHz.…”