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We report the design of a metamaterial-based antenna beamformer that transforms 7 stipulated inputs to 7 prescribed output beams. The beamformer is printed and exhibits a broad bandwidth of operation. It is modeled as an inhomogeneous, anisotropic 2D medium, and is designed using an constrained optimization approach. This design technique offers improved flexibility and feasibility over coordinate-transformation...
A body area networks (BAN) can provide a wide range of applications in primary for medical health care such as telemetering vital sign, tele controlling medical equipment. This paper presents an innovative dual band implantable printed monopole antenna proposed for Body Area Network(BAN) that covers the bands as MICS(402–405MHz) and ISM(2.4–2.48GHz). A non-shorted monopole omega structure is acquired...
This paper presents a simple compact square patch dual band Multiple Input Multiple Output (MIMO) antenna for wireless terminal devices. The antenna designed to operate in the frequency bands of 1.78–2.74 GHz and 3.33–6.06 GHz that covers LTE, Bluetooth, WiMAX and WLAN applications. The antenna consists of two concentric square ring slots etched on the corner truncated square patch monopole radiator...
The 3GPP standardization process for the fifth generation of wireless networks, 5G, has been in full gear since early 2016. Perhaps one of the most ambitious standardization goal in wireless history; encompassing diverse characteristics such as massive broadband connectivity, massive (and densely) connected devices, and ultra reliable and low latency connection. In this paper, we review the progress...
An electrically tuned antenna for mobile handsets working in four low and one high LTE frequency bands is described. The PIFA-type antenna contains high and low-frequency branches. A tuning element is connected to the low-frequency branch. The proposed antenna operates at one of low-frequency bands depending on state of the tuning element, keeping tuning on the high-frequency band. A varactor and...
Carrier frequencies beyond 300 GHz have recently received attention primarily due to the potential for impressive capacity for future multi-gigabit wireless communication systems. In this context, this paper considers the different attenuation factors at the THz band and estimates the available bandwidth and the corresponding maximum data rate in the THz band. Results show that capacity values beyond...
Paper presents a fully printable chip less RFID tag using spur line resonators. Spectral signature technique of a spur line resonator circuit is used to detect tag's ID. The tag is capable of transmitting 12-bits for the bandwidth of 1.9 to 4.04 GHz. A spur line multi resonator and two micro strip fed UWB monopole antennas reside in chip less RFID tag. Spur line multi resonator is designed on three...
Narrowband satellite communications (SATCOM) in the ultra high frequency (UHF) band is an attractive option within the military SATCOM (MILSATCOM) community. The UHF user terminals (UTs) are typically low cost, easily deployable and have broad beamwidths so that precise pointing to the satellite is not a requirement for mobile users. At the same time, some inherent disadvantages of UHF SATCOM are...
In this paper different strategies are proposed for customizing the new LTE-U commercial protocol for multi-mission tactical networks. The LTE-U (LTE-Unlicensed) approach leverages dual connectivity with licensed and unlicensed carrier aggregation combined to traffic steering techniques. In our proposed system named ‘LTE-UTac’ the unlicensed channel is either used in parallel to the licensed channel...
We introduce a new approach to measure spin waves on-chip and describe the design of an ultra-wideband Low-Noise Amplifier (LNA) implemented in a readout circuitry for characterization of the spin wave devices. The LNA shows a gain of 22.6 dB in the frequency range between 9.7 GHz and 43.3 GHz. The minimum Noise Figure (NF) is 5.3 dB at 22.75 GHz. Simulations were performed with 65 nm CMOS technology...
A Bandwidth reconfigurable microstrip antenna has been presented in this paper. Dual layer circular patch antenna structure has been used. Geometrical variation in horse shoe structure used as lower patch is responsible for controlled bandwidth variation. The proposed antenna structure provides bandwidth variation from 90.99 MHz to 144 MHz at constant resonant frequency of 3.4GHz.
This paper presents an aperture-coupled microstrip antenna, which is operating at dual band of millimeter-wave (mmW) frequencies, 28GHz and 38GHz. The aperture antenna was integrated with multilayer substrate construct on 5-layers Low temperature Co-fiber Ceramic (LTCC) with 5 mils thickness. The driven patch was applied to enhance the bandwidth. The bandwidths using are 9.1 percent at 28GHz and 9...
Design and analysis of millimeter-wave (MMW) mushroom-like, circular-patch electromagnetic band-gap (EBG) structure is presented. The in-phase reflection and band-gap characteristics of the proposed EBG structure are investigated. Results show that the proposed EBG structure has stable reflection properties when normally and obliquely illuminated by a plane wave with different polarizations around...
A dual band PIFA antenna for portable devices is presented. It operates in the 450 LTE (449–461 MHz) and GSM 900 (876–922 MHz) frequency bands. The proposed antenna which has a very compact size of 7 (0.01λ0) × 7 × 70 (0.1λ0) mm3, consists of two branches and a metallic patch and is suitable to integrate in small envelopes. The low cost antenna offers high total efficiency and gain in both bands....
This communication concerns the experimental validation of a probe compensated near-field — far-field (NF-FF) transformation technique with bi-polar scanning for quasi-planar antennas requiring a minimum number of NF data. Such a technique properly exploits the nonredundant sampling representations of the electromagnetic fields to obtain an efficient representation of the voltage measured by the probe...
In this paper, we study the uplink (UL) and downlink (DL) ergodic capacity in the bidirectional dynamic network (BDN). By dynamically allocating the numbers of UL and DL remote radio heads (RRHs), BDN facilitates simultaneous UL and DL communications to accommodate the data traffic asymmetry. Assuming that the number of antennas at each RRH (M) is large, we derive the closed-form expressions for the...
This paper proposes a novel indoor-outdoor caching relay system (CRS) and develops the corresponding caching mechanism, which can improve the utilization of wireless resources. It operates in two phases periodically. In Phase I, spectrum resources of the established links between MBS and user equipment (UE) are extracted to support data caching. In Phase II, caching relay system can directly serve...
Advanced antenna arrays were designed for NASA's EcoSAR airborne radar instrument. EcoSAR is a beamforming synthetic aperture radar instrument designed to make polarimetric and "single pass" interferometric measurements of Earth surface parameters. EcoSAR's operational requirements of a 435MHz center frequency with up to 200MHz bandwidth, dual polarization, high cross-polarization isolation...
By pulling some of the signal detection processing that occurs at the final processor in a pulse-detecting system into each node for pre-processing, the amount of digital sample data that must be sent to the final processor can be greatly reduced. This capability would expand the amount of achievable beam-bandwidth for a fixed amount of digital I/O available between hierarchical beamforming nodes...
This paper presents a novel imaging method in the microwave range using a random medium. A comparison between three setup configurations is depicted to show the efficacy for radar cross section measurements in an anechoic chamber. By taking advantage of the spectral degrees of freedom provided by the propagation within a multiple scattering medium consisting of a collections of metallic rods and the...
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