An interdigital bandpass filter embedded in LTCC for 5-GHz wireless LAN applications

2005 ◽  
Vol 15 (5) ◽  
pp. 357-359 ◽  
Author(s):  
Gangqiang Wang ◽  
M. Van ◽  
F. Barlow ◽  
A. Elshabini
Keyword(s):  
Wireless Lan ◽  
Bandpass Filter ◽  
5 Ghz

The Microwave Dielectric Materials of (Zn1-xMgx)TiNb2O8 for Electroceramics Devices Applications

2013 ◽  
Vol 547 ◽  
pp. 49-55 ◽  
Author(s):  
Cheng Liang Huang ◽  
Sen Hung Huang ◽  
Ruei Zhung Lee
Keyword(s):  
Wireless Lan ◽  
Microstrip Line ◽  
Bandpass Filter ◽  
Microwave Dielectric Properties ◽  
Dielectric Materials ◽  
Frequency Stability ◽  
Dielectric Substrates ◽  
Microwave Dielectric ◽  
5 Ghz ◽  
Filter Area

The microwave dielectric properties of ZnTiNb2O8 ( ~34, Qf ~42,500GHz, ~ –52ppm/°C) was reported by Hong et. al. To lower the dielectric loss of ZnTiNb2O8, we studied the systems of (Zn1-xMgx)TiNb2O8 (x=0.02-0.1) ceramics. The manner of equivalent-charge trace substitutions for Zn2+-sites were replaced with Mg2+. In order to achieve more stability, CaTiO3 ( ~ +800ppm/°C) was used to adjust the negative τf of (Zn0.95Mg0.05)TiNb2O8 ( ~ –58ppm/°C). A bandpass filter using coupled microstrip-line resonators have been designd for wireless LAN system such as IEEE 802.11 ( 2.4 or 5 GHz). The response of the implemented filter used 0.8(Zn0.95Mg0.05)TiNb2O8-0.2 CaTiO3 ( ~35.77, Qf ~18,000GHz, ~ +4ppm/°C) dielectric substrates. In this paper, the bandpass filter area designed on 0.8(Zn0.95Mg0.05)TiNb2O8-0.2 CaTiO3 is reduced 88% than FR4 substrates and the near zero τf makes better frequency stability.

Design and Fabrication of 5 GHz Miniaturized Bandpass Filter Using Superconducting Microstrip Quasi-Spiral Resonators

2007 ◽  
Vol 17 (2) ◽  
pp. 890-893 ◽  
Author(s):  
S. Ono ◽  
Y. Harada ◽  
A. Saito ◽  
M. Kimura ◽  
N. Sekiya ◽  
...  
Keyword(s):  
Bandpass Filter ◽  
5 Ghz

scholarly journals All-optical demultiplexing of closely spaced multimedia radio signals using sub-picometer fiber Bragg grating

2021 ◽  
Author(s):  
Hatice Kosek
Keyword(s):  
Wireless Lan ◽  
High Speed ◽  
Bandpass Filter ◽  
Optical Filters ◽  
Multimedia Data ◽  
Potential Candidate ◽  
Rf Signals ◽  
All Optical ◽  
Radio Signals ◽  
Network Flexibility

Subcarrier multiplexed (SCM) transmission of multimedia radio signals such as CATV (5-860 MHz), cellular wireless (900 MHz) and wireless LAN (2.4 GHz) over fiber is frequently used to deliver broadband services cost effectively. These multi-channel radio-over-fiber (ROF) links have interesting applications and can connect enhanced wireless hotspots that will support high speed wireless LAN services or low speed cellular services to different customers from the same antenna. The SCM signals need to be demultiplexed, preferably in the optical domain for many reasons. Prefiltering of SCM signals with fiber-based optical filters warrants the use of inexpensive photodetectors and increases network flexibility. However, realizing optical demultiplexing as sub-GHz level is challenging and thus necessitates optical filters with high selectivity and low insertion loss and distortion. We developed a novel sub-picometer all-optical bandpass filter by creating a resonance cavity using two closely matched fiber Bragg gratings (FBGs). This filter has a bandwidth of 120 MHz at -3 dB, 360 MHz at -10 dB and 1.5 GHz at -20 dB. Experimental results showed that the filter is capable of separating two radio frequency (RF) signals spaced as close as 50 MHz without significant distortion. When this demultiplexer was employed to optically separate 2.4 GHz and 900 MHz radio signals, it was found to be linear from -38 dBm to +6 dBm with ~ 25.5 dB isolation. There was no significant increment in the BER of the underlying multimedia data. Results verified that the fabricated narrow bandpass filter can be a potential candidate in demultiplexing of RF signals in networks based on subcarrier multiplexed schemes.

scholarly journals Implementation and Evaluation of WLAN 802.11ac for Residential Networks in NS-3

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Andy Bubune Amewuda ◽  
Ferdinand Apietu Katsriku ◽  
Jamal-Deen Abdulai
Keyword(s):  
Wireless Lan ◽  
Multiple Input Multiple Output ◽  
Access Point ◽  
Operating Conditions ◽  
Network Simulator ◽  
High Data ◽  
Delay Jitter ◽  
Combined Features ◽  
5 Ghz ◽  
Very High

Wi-Fi has been an amazingly successful technology. Its success may be attributed to the fact that, despite the significant advances made in technology over the last decade, it has remained backward compatible. 802.11ac is the latest version of the wireless LAN (WLAN) standard that is currently being adopted, and it promises to deliver very high throughput (VHT), operating at the 5 GHz band. In this paper, we report on an implementation of 802.11ac wireless LAN for residential scenario based on the 802.11ax task group scenario document. We evaluate the 802.11ac protocol performance under different operating conditions. Key features such as modulation coding set (MCS), frame aggregation, and multiple-input multiple-output (MIMO) were investigated. We also evaluate the average throughput, delay, jitter, optimum range for goodput, and effect of station (STA) density per access point (AP) in a network. ns-3, an open source network simulator with features supporting 802.11ac, was used to perform the simulation. Results obtained indicate that very high data rates are achievable. The highest data rate, the best mean delay, and mean jitter are possible under combined features of 802.11ac (MIMO and A-MPDU).

A 5-GHz CMOS transceiver for IEEE 802.11a wireless LAN systems

2002 ◽  
Vol 37 (12) ◽  
pp. 1688-1694 ◽  
Author(s):  
M. Zargari ◽  
D.K. Su ◽  
C.P. Yue ◽  
S. Rabii ◽  
D. Weber ◽  
...  
Keyword(s):  
Wireless Lan ◽  
Ieee 802.11A ◽  
5 Ghz

scholarly journals IEEE 802.11ah: A Long Range 802.11 WLAN at Sub 1 GHz

2013 ◽  
pp. 83-108
Author(s):  
Weiping Sun ◽  
Munhwan Choi ◽  
Sunghyun Choi
Keyword(s):  
Wireless Lan ◽  
Large Scale ◽  
Transmission Range ◽  
Mac Layer ◽  
Medium Access ◽  
Frequency Spectra ◽  
Ieee 802.11Ah ◽  
Phy Layer ◽  
5 Ghz ◽  
Access Mechanisms

IEEE 802.11ah is an emerging Wireless LAN (WLAN) standard that defines a WLAN system operating at sub 1 GHz license-exempt bands. Thanks to the favorable propagation characteristics of the low frequency spectra, 802.11ah can provide much improved transmission range compared with the conventional 802.11 WLANs operating at 2.4 GHz and 5 GHz bands. 802.11ah can be used for various purposes including large scale sensor networks, extended range hotspot, and outdoor Wi-Fi for cellular traffic offloading, whereas the available bandwidth is relatively narrow. In this paper, we give a technical overview of 802.11ah Physical (PHY) layer and Medium Access Control (MAC) layer. For the 802.11ah PHY, which is designed based on the down-clocked operation of IEEE 802.11ac’s PHY layer, we describe its channelization and transmission modes. Besides, 802.11ah MAC layer has adopted some enhancements to fulfill the expected system requirements. These enhancements include the improvement of power saving features, support of large number of stations, efficient medium access mechanisms and throughput enhancements by greater compactness of various frame formats. Through the numerical analysis, we evaluate the transmission range for indoor and outdoor environments and the theoretical throughput with newly defined channel access mechanisms.

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