A Complete Dual-band Chip-set with USB 2.0 Interface for IEEE 802.11 a/b/g WLAN applications

2005 ◽  
Author(s):  
Keng Fong ◽  
David Tung ◽  
Max Lee ◽  
Sheng Lee ◽  
Bart Wu ◽  
...  
Keyword(s):  
Ieee 802.11 ◽  
Dual Band

A Fully Integrated Dual-Band Low Noise Amplifier For IEEE 802.11 & Hiperlan Applications

2004 ◽  
Vol 1 (1) ◽  
pp. 26-32 ◽  
Author(s):  
Mou Shouxian ◽  
Ma Jianguo ◽  
Yeo Kiat Seng ◽  
Do Man
Keyword(s):  
Ieee 802.11 ◽  
Low Noise ◽  
Low Noise Amplifier ◽  
Dual Band ◽  
Fully Integrated ◽  
Noise Amplifier

scholarly journals A new technique to design planar dipole antennas by using Bezier curve and Particle Swarm Optimization

2016 ◽  
Vol 65 (3) ◽  
pp. 513-525 ◽  
Author(s):  
Nuttaka Homsup ◽  
Winyou Silabut ◽  
Vuttichai Kesornpatumanum ◽  
Pravit Boonek ◽  
Waroth Kuhirun
Keyword(s):  
Particle Swarm Optimization ◽  
Ieee 802.11 ◽  
Particle Swarm ◽  
New Technique ◽  
Dual Band ◽  
Bézier Curve ◽  
Bezier Curve ◽  
Swarm Optimization ◽  
A New Technique ◽  
5 Ghz

Abstract This research presents a new technique which includes the principle of a Bezier curve and Particle Swarm Optimization (PSO) together, in order to design the planar dipole antenna for the two different targets. This technique can improve the characteristics of the antennas by modifying copper textures on the antennas with a Bezier curve. However, the time to process an algorithm will be increased due to the expansion of the solution space in optimization process. So as to solve this problem, the suitable initial parameters need to be set. Therefore this research initialized parameters with reference antenna parameters (a reference antenna operates on 2.4 GHz for IEEE 802.11 b/g/n WLAN standards) which resulted in the proposed designs, rapidly converted into the goals. The goal of the first design is to reduce the size of the antenna. As a result, the first antenna is reduced in the substrate size from areas of 5850 mm2 to 2987 mm2 (48.93% approximately) and can also operates at 2.4 GHz (2.37 GHz to 2.51 GHz). The antenna with dual band application is presented in the second design. The second antenna is operated at 2.4 GHz (2.40 GHz to 2.49 GHz) and 5 GHz (5.10 GHz to 5.45 GHz) for IEEE 802.11 a/b/g/n WLAN standards.

scholarly journals Two-Port CPW-Fed Dual-Band MIMO Antenna for IEEE 802.11 a/b/g Applications

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Yuqing Dou ◽  
Zhuoni Chen ◽  
Jing Bai ◽  
Qibo Cai ◽  
Gui Liu
Keyword(s):  
Ieee 802.11 ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Coplanar Waveguide ◽  
Multiple Input Multiple Output ◽  
Dual Band ◽  
Impedance Bandwidth ◽  
Area Network ◽  
Frequency Bands ◽  
Mimo Antenna

A coplanar waveguide- (CPW-) fed dual-band multiple-input multiple-output (MIMO) antenna for 2.45/5.5 GHz wireless local area network (WLAN) applications is presented in this paper. The presented MIMO antenna consists of two identical trapezoidal radiating elements which are perpendicular to each other. The size of the entire MIMO antenna is 50 × 50 × 1.59 mm3, which is printed on a FR4 substrate. The measured impedance bandwidth of the proposed antenna is 2.25–3.15 GHz and 4.89–5.95 GHz, which can cover IEEE 802.11 a/b/g frequency bands. A rectangular microstrip stub is introduced to achieve a good isolation which is less than −15 dB in both operation frequency bands. The measured peak gain is 5.59 dBi at 2.45 GHz and 5.63 dBi at 5.5 GHz. The measured antenna efficiency is 77.8% and 80.4% in the lower and higher frequency bands, respectively. The ECC values at the lower and higher frequencies are lower than 0.003 and 0.01, respectively.

scholarly journals Compact Dual-Band Dipole Antenna with Asymmetric Arms for WLAN Applications

2014 ◽  
Vol 2014 ◽  
pp. 1-4 ◽  
Author(s):  
Chung-Hsiu Chiu ◽  
Chun-Cheng Lin ◽  
Chih-Yu Huang ◽  
Tsai-Ku Lin
Keyword(s):  
Wireless Communication ◽  
Ieee 802.11 ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Local Area ◽  
Dipole Antenna ◽  
Dual Band ◽  
Area Network ◽  
Compact Size ◽  
Communication Devices

A dual-band dipole antenna that consists of a horn- and a C-shaped metallic arm is presented. Depending on the asymmetric arms, the antenna provides two −10 dB impedance bandwidths of 225 MHz (about 9.2% at 2.45 GHz) and 1190 MHz (about 21.6% at 5.5 GHz), respectively. This feature enables it to cover the required bandwidths for wireless local area network (WLAN) operation at the 2.4 GHz band and 5.2/5.8 GHz bands for IEEE 802.11 a/b/g standards. More importantly, the compact size (7 mm × 24 mm) and good radiating performance of the antenna are profitable to be integrated with wireless communication devices on restricted RF-elements spaces.

scholarly journals A Dual-Band Single-Feed Switched Beam Antenna for WLAN

2017 ◽  
Vol 63 (4) ◽  
pp. 405-410
Author(s):  
Pichaya Chaipanya ◽  
Pawarit Rattanakriengkai ◽  
Pijitra Potup ◽  
Laliphat Lapourailers
Keyword(s):  
Ieee 802.11 ◽  
Patch Antenna ◽  
Simple Structure ◽  
Signal Strength ◽  
Beam Pattern ◽  
Dual Band

Abstract This article presents the dual-band of a single patch antenna that can operate at a frequency of 2.47 to 5.04 GHz, which is available in WLANs (IEEE 802.11). The beam pattern of the antenna can be switched by changing the position of shorted-circuit points at each edge of the antenna. The advantage of the proposed antenna is that it is a simple structure which is small in size, weighs little and has an easily adjustable beam. In addition, the antenna is tested under real circumstances using the existing WLAN infrastructure. The results confirm that the signal strength can be improved when the proposed switched beam antenna is utilized.

A novel compact dual-band antenna for IEEE 802.11 a/b/g/n WLAN

2010 ◽  
Vol 53 (2) ◽  
pp. 315-317 ◽  
Author(s):  
Mustapha Harmouzi ◽  
Mohamed Essaaidi
Keyword(s):  
Ieee 802.11 ◽  
Dual Band ◽  
Dual Band Antenna

A Dual Band Fractional-N Frequency Synthesizer with a Self-Calibrated Charge Pump for WLAN Standards

2018 ◽  
Vol 27 (08) ◽  
pp. 1850131 ◽  
Author(s):  
Mostafa Azadbakht ◽  
Ali Sahafi ◽  
Esmaeil Najafi Aghdam
Keyword(s):  
Ieee 802.11 ◽  
Power Dissipation ◽  
Frequency Synthesizer ◽  
Charge Pump ◽  
Local Oscillator ◽  
Cmos Technology ◽  
Dual Band ◽  
Spectral Purity ◽  
Fully Integrated ◽  
Voltage Range

This work presents a fully integrated fractional-[Formula: see text] frequency synthesizer that covers the entire frequency bands specified in the IEEE 802.11 a/b/g/n. In this paper, the effects of charge pump (CP) gain mismatch on spectral purity of local oscillator signal is studied theoretically and a new high precision self-calibrated CP is presented for alleviating the nonidealities. The idea is implemented in a 0.18-[Formula: see text]m standard CMOS technology. According to post layout simulation, the proposed calibration circuit demonstrates an excellent matching in the CP currents in a wide voltage range. By using this technique, the average of close-in phase noise of the designed frequency synthesizer is suppressed by more than 12[Formula: see text]dBc. The active whole chip die area is 0.475[Formula: see text]mm2 and the power dissipation from a 1.8-V DC supply is 17.3–20.6[Formula: see text]mW.

DNA sequence mapping in interphase and metaphase chromosomes by fluorescence in situ hybridization

1992 ◽  
Vol 50 (1) ◽  
pp. 496-497
Author(s):  
Barbara Trask ◽  
Susan Allen ◽  
Anne Bergmann ◽  
Mari Christensen ◽  
Anne Fertitta ◽  
...  
Keyword(s):  
In Situ Hybridization ◽  
Dna Sequence ◽  
Dna Sequences ◽  
Dual Band ◽  
Nick Translation ◽  
Metaphase Chromosomes ◽  
Band Pass ◽  
Texas Red ◽  
Fluorescent Spot

Using fluorescence in situ hybridization (FISH), the positions of DNA sequences can be discretely marked with a fluorescent spot. The efficiency of marking DNA sequences of the size cloned in cosmids is 90-95%, and the fluorescent spots produced after FISH are ≈0.3 μm in diameter. Sites of two sequences can be distinguished using two-color FISH. Different reporter molecules, such as biotin or digoxigenin, are incorporated into DNA sequence probes by nick translation. These reporter molecules are labeled after hybridization with different fluorochromes, e.g., FITC and Texas Red. The development of dual band pass filters (Chromatechnology) allows these fluorochromes to be photographed simultaneously without registration shift.

Dual band hybrid vehicular telephone antenna

2002 ◽  
Vol 149 (1) ◽  
pp. 41-44 ◽  
Author(s):  
L. Economou ◽  
R.J. Langley
Keyword(s):  
Dual Band
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