Multi-Band Printed Internal Monopole Antenna for Mobile Handset Applications

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.…”

“…In this group, the antenna in [7] ( [9]) although having a small antenna area of 38.5 × 15 = 577.5 mm 2 (60 × 10 = 600 mm 2 ) can support only the following five communication standards: GSM 900, DCS, PCS, UMTS, and 2.4-GHz WLAN (GSM 850, GSM 900, DCS, PCS, and UMTS). Belonging to the third group, monopole slot antennas can also be operated as a quarter-wavelength resonant structure if the slot is cut at the edge of the ground plane [12][13][14][15]. The monopole slot antenna designed in [15] has a small size of 40 × 15 = 600 mm 2 and can support the desired hexa-band operations.…”

“…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.…”

A Compact Quad-Band Pifa by Tuning the Defected Ground Structure for Mobile Phones

“…For mobile phones, the main objectives which are necessary for investigations include the properties of antenna elements, bandwidth enhancement, efficiency and size [8,9]. It has also been well known that the performance, especially the bandwidth enhancement, is largely defined by the combined behavior of the antenna and the phone chassis.…”