An inverted‐L monopole antenna loaded with a meandered wire for GSM/DCS dual‐band mobile phones

Abstract

A novel dual‐band monopole antenna, created by loading a meandered wire to an inverted‐L wire monopole, is proposed. The antenna is suitable for applications in GSM/DCS dual‐band mobile phones. Both the inverted‐L wire and the meandered wire operate as quarter‐wavelength structures, and generate a resonant mode at about 1800 and 900 MHz, respectively. The obtained impedance bandwidths cover the required bandwidths of the GSM band (890–960 MHz) and the DCS band (1710–1880 MHz). In addition, the proposed antenna has a low profile of only 14 mm (about 4.2% of the wavelength at 900 MHz). © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 33: 212–214, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10278

A planar meander‐line antenna for triple‐band operation of mobile handsets

“…This is largely because the operating frequencies in the 900-and 1800-MHz bands have wavelengths that are more comparable to the dimensions of the ground plane, and thus a larger effect is expected. Therefore, it is suggested that the proposed planar meander-line antenna needs less ground plane than those of the designs presented in [4,5], which are more suitable to be placed in the folded mobile-phone housing. The corresponding parameters of the meander-line antenna performance are listed in Table 1 for comparison.…”

“…However, since it can be easily broken, planar folded-monopole antennas with a low profile have become the most popular candidates for mobile-phone antenna applications [1][2][3][4][5][6][7]. These related designs are achieved by modifying the geometry of a folded-monopole/loop antenna [1][2][3] and using the meandering monopole, which consists of three branch strips [4] or the inverted-L wire loaded with a meander wire [5], the doublemeander antenna with two parasitic metallic strips [6], and the double-branch printed inverted-F antenna (DB-PIFA) [7]. However, the operating bands for the above designs are mainly focused on the 900-MHz band (GSM, global system for mobile communication), 1800-MHz band (DCS, digital communication system) and 1900-MHz band (PCS, Personal Communication System).…”

“…Recently, many filtering structures based on fiber delay line and fiber Bragg gratings (FBGs) have been proposed and demonstrated, such as the unbalanced Mach-Zehnder structure [2], the structure using broadband source and FBG array [3], the approach using a superstructure FBG and a broadband source [4], the FBG pair approach [5], the structure using a laser array and linear chirped FBG [6], the approach using FBG array and wavelength multiplexer [7], the tunable-filtering structure using a computercontrolled differential group-delay module [8], the tunable approach using broadband source and multimode DCF [9], the tunable approach based on a slicing filter using FBGs [10], and other active structures [11]. In this paper, we present a novel incoherent tunable notch filter using fiber loop and cascaded FBGs, where the free spectral range (FSR) of the filter can be tuned by adjusting the wavelength of the incident light.…”

A internal penta-band monopole with a parasitic strip for GSM850/GSM/900/DCS/PCS/UMTS operations

“…In the recent published papers [1][2][3][4], several internal antennas suitable for mobile phones and smartphones for GSMlDCS/PCS operations were presented. Several antenna structures might be suitable for tri-bands operation such as PIFA (Planar Invited-F Antenna) [2], internal monopole antenna [3] and external helix antenna.…”

“…Several antenna structures might be suitable for tri-bands operation such as PIFA (Planar Invited-F Antenna) [2], internal monopole antenna [3] and external helix antenna. Nowadays it is very different for the traditional signal structure to obtain the penta-band bandwidth covered the requirement bandwidth of GSM, DCS, PCS, and UMTS 2100 antenna with insufficient volume of antenna design.…”