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WLAN Applications (wlan + application)
Selected AbstractsA novel dual-band bandpass filter using stepped impedance resonators with transmission zerosMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 6 2008Qing-Xin Chu Abstract A novel dual-band bandpass filter using stepped impedance resonator is proposed in this letter. New coupling structures are illustrated to replace the normal counterparts, the circuit size is reduced about 40% compared with the conventional BPF with the same specifications, while the new structure can generate two transmission zeros in the insertion loss response, to validate the design and analysis, two dual-band bandpass filters centered at 2.4 GHz/5.2 GHz and 2.4 GHz/5.7 GHz for WLAN application were fabricated and measured, it is shown that the measured and simulated performance are in good agreement. The bandpass filters achieved insertion loss of less than 2 dB and return loss of greater than 16 dB in each band. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1466,1468, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23394 [source] Compact meander monopole antenna for tri-band WLAN applicationMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 4 2007Li-Na Zhang Abstract A novel printed meander monopole antenna for tri-band wireless local area network (WLAN) applications is presented. The antenna is composed of a meander strip and a straight strip with a gap between the ends of them, both printed on an inexpensive FR4 substrate, and is fed by a 50 , microstrip feeder with the notched ground plane. The operation bandwidth of the proposed antenna covers 2.4, 5.2, and 5.8 GHz WLAN bands with light weight and compact radiator size of only 12 × 7 mm2. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 986,988, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22314 [source] A 17-GHz 130-nm CMOS VCO subsystem module in LTCC-based technology for WLAN applicationsINTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 3 2006P. Mayr Abstract This article presents a 17-GHz band VCO for system-in-a-package (SiP) solutions. A workflow for a chip-package codesign, which includes the design of LTCC-inductors, is presented. The VCO shows a phase noise of ,110 dBc/Hz at 1-MHz offset and a figure of merit (FOM) of ,190.4 dBc/Hz. Design trade-offs are given concerning phase noise, tuning range, and power consumption. © 2006 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2006. [source] A 3-V variable-gain amplifier in Si/SiGe BiCMOS technology for 5-GHz WLAN applicationsINTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 5 2005F. Alimenti Abstract A variable-gain class-A amplifier for 5-GHz wireless local area networks (WLAN) applications is developed using commercial 0.35-,m Si/SiGe BiCMOS technology. The amplifier is based on a cascode differential pair and is fully integrated with input and output matching networks. The design starts with application of the Cripps' method and it is further refined by nonlinear harmonic-balance simulations. These simulations are in good agreement with the measurements carried out at wafer level on a realized prototype. © 2005 Wiley Periodicals, Inc. Int J RF and Microwave CAE 15, 2005. [source] Dual band,rejected microstrip antenna for WiMAX/WLAN applicationsMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 8 2010Shun-Yun Lin Abstract In this article, we propose a novel design to obtain dual band,rejected characteristics in printed microstrip antenna.First, an ultrawide operating band from 2.15 GHz to about 6.50 GHz is achieved by locating the rectangular radiating patch above a larger rectangular notch cut in the finite ground plane edge. Two folded strips with different length protrude from the patch corner with null surface current to introduce dual rejected band. The longer strip and shorter strip are independently associated with lower and upper rejected band. By suitable adjustment in strip lengths, two rejected bands centered at 3 and 4.7 GHz are successfully introduced. Also, a triband operation for 2.5/3.5/5.5 GHz WiMAX and 2.4/5.2/5.8 GHz WLAN applications is achieved for the proposed microstrip antenna. Details of the design considerations are presented, and results of the implemented prototype are discussed. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1901,1905, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25312 [source] A dual-band split-ring monopole antenna for WLAN applicationsMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 11 2009Siddik Cumhur Basaran Abstract In this article, a novel dual-band microstrip monopole antenna based on split-ring elements is proposed for WLAN (2.4/5 GHz) applications. The antenna fed by a two-stage microstrip line has fairly small dimensions and provides 7.5 and 25.5% impedance bandwidth performance at the respective bands. Also, the antenna exhibits almost uniform radiation patterns at each frequency band. The measurement results of the fabricated antenna are in good agreement with the simulations. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2685,2688, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24708 [source] A 2.4/5.7-GHz dual-band low-power CMOS RF receiver with embedded band-select switchesMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 3 2009D.-R. Huang Abstract This article presents a 2.4-/5.7-GHz dual-band low-power direct-conversion CMOS RF receiver for the 802.11a/b/g WLAN applications. The RF receiver includes a low noise amplifier (LNA) with dual input stages and dual switches for each of 2.4/5.7-GHz applications. This design can substitute the use of two LNAs in conventional structure and eliminate the use of the costly external band-select switches. It also alleviates the difficulty of single matching for multiple frequency bands. The RF receiver also includes a Gilbert-cell-based broadband mixer which is designed to be both low power consumption and relatively high conversion gain. Fabricated in 0.18-,m CMOS technology, the RF receiver exhibits a conversion gain of 25.8/20.6 dB, DSB noise figure of 4.4/5.6 dB, and input IP3 of ,18/,12.5 dBm at 2.4/5.7 GHz frequency band, respectively. The measured EVM for IEEE 802.11a/b/g is 1.2/1.6/1.1% at data rate of 11/54/54 Mbps. The power consumption under 1.8 V supply is 10.6 mW for the 2.4 GHz mode, and 17.2 mW for the 5.7 mode. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 593,597, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24120 [source] Compact dual-band filter design using crossly coupled ,/4 SIRs embedded with spur-line for WLAN applicationsMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 11 2008Pow-Wen Chen Abstract This article presents a compact dual-band bandpass filter (BPF) design using ,/4 stepped impedance resonators (SIRs) embedded with spur-line for the WLAN applications. The filter covers both the operating frequencies of 2.45 GHz and 5.2,5.8 GHz. The crossly coupled mechanism is used in the filter design to provide attenuation poles by the passband edges for enhancing the signal selectivity and increasing stopband rejection levels. The tapped-line is incorporated in feed structure to save the circuit space. The spur-line is embedded in each I/O SIRs to push the upper stopband limit to a higher frequency. Experiments are conducted to verify the circuit performance. A good agreement is observed between the simulation and the measurement. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2807,2810, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23846 [source] Broadband dual-band CPW-fed closed rectangular ring monopole antenna with a vertical strip for WLAN operationMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 7 2008Li Zhang Abstract A novel CPW-fed closed rectangular ring monopole antenna with a vertical strip is proposed for WLAN applications. The antenna with a very simple structure is easily fabricated. The measured results explore broadband dual-frequency operation with (10 dB) impedance bandwidths of 23.4%, range from 2.24 to 2.82 GHz, and 22.9%, ranging from 4.86 to 6.18 GHz, at bands of 2.48 and 5.76 GHz, respectively, which cover the 2.4/5.2/5.8 GHz WLAN operating bands. Also, good omni-directional radiation patterns and antenna gains over the operating bands have been obtained. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1929,1931, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23514 [source] Compact coaxial-line-fed flat-plate dipole antenna for WLAN applicationsMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 2 2008Saou-Wen Su Abstract A novel coaxial-line-fed flat-plate dipole antenna for WLAN operation in the 2.4 GHz band is presented. The dipole antenna is rectangular in shape and can easily be fabricated by stamping a metal plate at low cost. The two radiating arms of the dipole antenna are first bent into a compact structure with the dimensions 10 mm × 38 mm and further short-circuited with a narrow shorting strip, which allows the antenna to be obtained from one single, stamped metal plate only. In addition, good impedance matching for 2.4 GHz operation can also be achieved by controlling the distance between the feeding points and the shorting strip. The design prototype of the antenna is elaborated and discussed in detail in the article. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 420,422, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23116 [source] Dual-band filter design of combined half and quarter wavelength SIRs for WLAN applicationsMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 1 2008Pow-Wen Chen Abstract This article presents a dual-band bandpass filter composed of ,/2 and ,/4 stepped impedance resonators for the wireless local area network applications. The filter covers both the operating frequencies of 2.45 GHz and 5.2-5.8 GHz. The doubly parallel-coupling mechanism is used in the filter design to reduce the insertion losses and to gain a wider bandwidth. The cross coupling configuration and the tapped-line I/O feed are adopted in this filter design to provide the attenuation poles for improving the signal selectivity and stopband rejection levels. Experiments were conducted to verify the circuit performance. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 13,15, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22979 [source] Erratum: Dual and triple-band PIFA design for WLAN applicationsMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 12 2007Chow-Yen-Desmond Sim Originally published Microwave Opt Technol Lett 49: 2159,2162, 2007. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 3192, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22885 [source] Compact-planar monopole loop antennas for 802.11b/g WLAN systemsMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 9 2007Mariusz Bledowski Abstract Two monopole antennas using Koch loop and Minkowski loop radiators fed by microstrip line are proposed for WLAN applications in the 2.45/5.25 bands. To achieve the desired resonances, new configurations of impedance transformer with transmission line length close to ,/12 were designed. The prototypes have been examined, fabricated, and experimentally tested and found to fulfill with excess WLAN system requirements. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2299,2303, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22720 [source] Dual-band monopole antenna excited by a capacitive coupling feed for WLAN applicationsMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 5 2007Chih-Yu Huang Abstract A printed dual-band T-shaped monopole antenna with a shorted strip fed by a coupling microstrip line for wireless communication in the wireless local-area network (WLAN) band is studied. The proposed antenna can provide two separate impedance bandwidths of 101 MHz (about 4.1% centered at 2.45 GHz) and 1490 MHz (about 27% centered at 5.5 GHz), making it easier to cover the required bandwidths for WLAN operation in the 2.45 GHz band (about 3.4% bandwidth required) and 5.2/5.8 GHz bands (about 13% bandwidth required). We can easily find the enhancement of impedance bandwidth by using capacitive coupling feed. Details of the proposed antenna design and experimental results are presented and discussed. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1135,1138, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI.10.1002/mop.22380 [source] Microstrip dual-band bandpass filter using slow-wave resonators for WLAN applicationsMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 1 2007Xuehui Guan Abstract A dual-band bandpass filter using microstrip slow-wave resonators is developed for wireless local area network applications. The fundamental and higher order resonant harmonics of a microstrip open-loop resonator are analyzed against the length of the loading open stub. Then a dual-band bandpass filters is designed in the form of slow-wave open-loop resonators. A zero-degree feed structure is employed to produce transmission zeros near the passband to increase the rate of attenuations, and a quarter-wavelength feed line for impedance matching is added to get desired external quality factor at the input and output. The theoretical analysis and design procedures are successfully verified by experimental results. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 14,16, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22055 [source] A wideband circularly polarized microstrip patch antenna for 5,6-GHz wireless LAN applicationsMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 4 2005G. Yang Abstract A wideband slotted circularly polarized (CP) patch antenna is introduced for 5,6-GHz WLAN applications. A small 14.6 × 14.6 mm square patch on Duroid 5880 substrate can provide a return-loss bandwidth of 11% and an axial-ratio bandwidth of 8% with a single feed. A possible reconfigurable design achievable using PIN diode or MEMS switches capable of left-hand or right-hand circular polarization is also introduced. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 45: 279,285, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20796 [source] | ||||||||||