Uniplanar coupled‐fed printed PIFA for WWAN/WLAN operation in the mobile phone

Abstract

A coupled‐fed printed planar inverted‐F antenna (PIFA) with a compact uniplanar structure for easy implementation in the mobile phone for WWAN/WLAN operation is presented. The printed PIFA occupies a small area of 10 × 60 mm2 and provides two wide operating bands (the lower and upper bands) at about 900 and 2000 MHz for covering GSM850/900/DCS/PCS/UMTS/WLAN six‐band operation. The printed PIFA is formed by two coupled‐fed PIFAs of different sizes, a longer radiating/coupling portion and a shorter radiating/coupling portion. Owing to the use of the coupling feed, both of the two portions can generate dual‐resonance excitation, with the longer portion providing a wide lower band for GSM850/900 operation and the shorter portion providing a wide upper band for DCS/PCS/UMTS/WLAN operation. In addition, the lower and upper bands of the printed PIFA can generally be controlled separately by the longer and shorter portions, making it easy for fine tuning of the desired operating bands in practical applications. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1250–1257, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24298

A Coupled-Fed Reconfigurable Antenna for Internal Lte Mobile Phone Applications

“…In recent years, many planar monopole antennas [1][2][3], loop antennas [4,5] and parasitic antennas [6][7][8] have been used in mobile phone to improve the disadvantages of PIFA antenna. A monopole antenna with three stubs was designed in [3].…”

A Compact Planar Hexa-Band Internal Antenna for Mobile Phone

“…Besides keeping the appearances attractive, these devices must be small not only in the plane parallel to the screen but also in the thickness direction for becoming competitive in the market. For attractiveness in appearance, internal antennas that can be completely concealed in the case of a mobile phone are now prevailing over external antennas [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. However, the trend for an upcoming mobile phone is that more components need to be installed inside to make the mobile phone more powerful yet possibly smaller in overall size.…”

“…For ease of fabricating mobile handsets, printed internal antennas have been designed to be integrated with ground planes and system circuits on the same substrates [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Since the substrates employed are usually very thin and the conductors printed on them are even much thinner, it is safe to describe antennas of these types only by their widths and heights, without emphasizing their thicknesses.…”

“…However, a height of 15 mm may be regarded as too large for some mobile handsets. In the fourth group are printed planar inverted-F antennas (printed PIFAs) [16][17][18][19][20], whose operations also rely on quarter-wavelength resonance. A simple printed PIFA can be constructed by adding a grounded strip to an inverted-L quarter-wavelength monopole [16,17].…”

“…To overcome this disadvantage, some research papers [18][19][20] have proposed printed PIFAs using coupling feeding structures, instead of the direct feeding ones employed in [16,17]. These antenna designs not only can support WWAN or WWAN/WLAN operations but also have smaller antenna heights (i.e., 11, 11, 10 mm for the antennas in [18][19][20], respectively) than those in most of the antennas in [5][6][7][8][9][10][11][12][13][14][15]. Among them, the antenna in [20], although having the smallest antenna height of 10 mm, can support GSM 850/900/DCS/PCS/UMTS/2.4-GHz WLAN hexa-band operations.…”