Compact low cost dual polarized adaptive planar phased array for WLAN

Song, C.T.P.; Mak, A.C.K.; Wong, Bill; George, Dibin Mary; Murch, R.D.

doi:10.1109/tap.2005.852294

Cited by 26 publications

(8 citation statements)

References 18 publications

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“…Vendor transparency can be achieved by RF beamforming techniques in which the beamformer works at RF and has a single output/input to the transceiver chain, such as the beamforming arrays proposed in refs. [9,16]. The beamforming algorithm can be added in the firmware or the WLAN card driver software.…”

Section: Vendor Transparencymentioning

confidence: 99%

Capacity enhancement by terminal originated beamforming for wireless local area networks

Fitzek

Eggers

2007

Wireless Pers Commun

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In dense traffic areas, wireless local area networks (WLANs) suffer from interference problems due to the usage of the crowded unlicensed ISM band and the lack of available spectrum. To mitigate these problems, a terminal side beamforming framework is proposed-this beamforming is capable of focusing the transmission and the reception in the relevant direction of the access point to exploit the directivity of the indoor propagation channel. It provides network transparency to achieve the backwards compatibility to the existing WLAN networks, and vendor transparency to ease the system design process and thereby achieve low complexity and costs. The beamforming enabled terminal benefits in terms of capacity, energy efficiency, and security while it does not require any change on the network side costing network providers new investments. It will be an attractive value-added feature as well as low-cost solution for the future WLAN terminal design opening the door for WLAN terminal manufacturers to include the proposed solution into their product line.In this work, a WLAN terminal beamforming demonstrator has been developed to demonstrate the capacity enhancement in real environments. Signal to interference ratio (SIR) improvement as well as array gain were investigated by simulations with IEEE 802.11n cluster channel models and by experiments with the demonstrator in a typical office environment. The comparable results of simulations and experiments show significant array gain and SIR improvement. The significant capacity increase has been demonstrated in the experiments in both an interference free scenario and an interference limited scenario.

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Section: Vendor Transparencymentioning

confidence: 99%

Capacity enhancement by terminal originated beamforming for wireless local area networks

Fitzek

Eggers

2007

Wireless Pers Commun

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“…Microstrip patch antennas (MPA) are widely used in wireless devices and offer compact sizes with multiband antenna operation. MPA can be integrated easily with diode switches or optoelectronic devices to form reconfigurable patch antennas [3][4][5][6]. The techniques for reducing the size of MPA are reported extensively and include capacitive loading [1], LC resonator [2], meander configuration [3], and reactive loading [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…However, these techniques usually trade off the antenna bandwidth or antenna efficiency to achieve the reduction in antenna size. Different techniques [7] for creating multiband MPA antennas have been published, such as adding parasitic elements [5,8] to create an additional resonant frequency or adding more radiating elements shared with the same feed and ground [6,9]. These techniques inevitably increase the physical size in order to create the multiband characteristics.…”

Section: Introductionmentioning

confidence: 99%

Reconfigurable Single and Multiband Inset Feed Microstrip Patch Antenna for Wireless Communication Devices

Elsheakh¹,

Elsadek²,

Abdallah³

et al. 2010

PIER C

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Two novel designs for compact reconfigurable antennas are introduced for wireless communication devices. These designs solve the steering frequency problem by tracking the desired resonance frequency or by generating various operating frequency bands to be selected electronically. In the first design, the length of the rectangular defected ground structure (RDGS) is electrically adjusted to change the resonant frequency of the MPA. While in the second design different turns of spiral AMC ground plane generate frequency bands, or modes, that are selected/optimized to serve different communication systems simultaneously. These systems may include various combinations of bluetooth, S-band and wireless local-area network (WLAN). These designs have several advantages as the total antenna volume can be reused, and therefore the overall antenna will be compact, although, the radiation of the MPA is kept fixed without any degradation. The designs are verified through both numerical simulations and measurement of a fabricated prototype. The results confirm good performance of the single and multiband reconfigurable antenna designs.

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“…One such approach is an adaptive array where the beam patterns can be selected directly through straightforward digital base band signals. By appropriate selection of the antenna pattern or beam the desired signal can be improved while the interfering signals can be reduced and the performance of the wireless communications system enhanced [3].…”

Section: Introductionmentioning

confidence: 99%

Short electromagnetic pulse propagation in the turbid medium

Ilyushin

Budak

2010

2010 20th International Crimean Conference "Microwave &Amp; Telecommunication Technology"

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In this paper, we introduce a compact low cost dual band adaptive planar phased array for MIMO systems .An important application of the array is in Wireless Local Area Networks (WLAN) where compact and low cost adaptable antennas promise increases in capacity and coverage. The lower band of the antenna ranges from 2.360 to 2.510 GHz, while the upper band covers from 5.000 to 5.450 GHz with an average gain of 3.5 dBi. The antenna system consists of an array of two elements in two layers and a ground wall to improve isolation characteristic. The proposed antenna exhibits low mutual coupling (less than -25dB) between elements with good bandwidth.

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Compact low cost dual polarized adaptive planar phased array for WLAN

Cited by 26 publications

References 18 publications

Capacity enhancement by terminal originated beamforming for wireless local area networks

Capacity enhancement by terminal originated beamforming for wireless local area networks

Reconfigurable Single and Multiband Inset Feed Microstrip Patch Antenna for Wireless Communication Devices

Short electromagnetic pulse propagation in the turbid medium

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