An efficient technique is introduced to reduce mutual coupling between two closely spaced PIFAs for MIMO mobile terminals. The proposed reduction method based on a T-shape slot impedance transformer and can be applied both single-band dual-band PIFAs. For the dual PIFAs, 10 dB bandwidth covers 2.4 GHz WLAN band (2.4-2.48 GHz), within an isolation of over 20 achieved. Moreover, version WiMAX 3.4-3.6 GHz, with isolations 19.2 22.8 dB, respectively. efficiency, gain radiation patterns two-PIFA...

The design of multiple antennas in compact mobile terminals is a significant challenge, due to both practical and fundamental tradeoffs. In this paper, antenna tradeoffs are presented the framework characteristic mode analysis. particular, interactions between elements modes their impact on investigated theory simulations. results reveal that play an important role determining optimal placement for low mutual coupling. Moreover, ability localize excitation currents chassis can significantly...

In this paper, a new WINNER+-based 3-D non-stationary geometry-based stochastic model (GBSM) for multiple-input multiple-output channels is proposed, as well extended evolving algorithms of time-variant channel parameters. Meanwhile, important statistical properties the model, i.e., autocorrelation function, cross-correlation and Doppler power spectrum density are derived analyzed. Moreover, we propose an efficient hardware implementation method, namely, sum-of-frequency-modulation (SoFM) to...

By considering the 3-D antenna arrays and arbitrary trajectories of a mobile station, generic non-stationary geometry-based stochastic model for multiple-input multiple-output channels is proposed. Under non-isotropic von Mises-Fisher scattering scenarios, theoretical approximate expressions time-variant spatial correlation function (SCF) are also derived analyzed. Simulation results show that SCFs proposed match well with ones existing models special cases 1-D linear 2-D curve trajectories....

In this paper, a new non-stationary Vehicle-to-Vehicle (V2V) channel model is proposed. It could generate more smooth fading phase between the adjacent states and guarantee accurate Doppler frequency, which great improvement comparing with those of existing geometry-based stochastic models (GBSMs) for V2V channels. Meanwhile, spatial-temporal correlation function (STCF) as well temporal (TCF) spatial (SCF) are derived in details based on power angle spectrums both mobile transmitter (MT)...

This paper investigates the blockage loss caused by human body at 11, 16, 28, and 32 GHz measurements modeling. The are carried out in an office environment using a vector network analyzer (VNA) two horn antennas, with one or persons walking along across line connecting transmitter (Tx) receiver (Rx). METIS knife-edge diffraction (KED) model, Kirchhoff KED geometrical theory of (GTD) model used to simulate effects. Gaussian is also fit measurement data. effects compared for four millimeter...

Frequency nonstationarity is an important statistical property of beyond fifth generation wireless communication channels due to extremely large bandwidths used in millimeter wave (mmWave) and teraherz communications. In this article, a general averaged power delay profile method first introduced as metric determine the stationarity regions time, frequency, spatial domains. Then, we apply frequency (FSRs) channel measurements sub-6-GHz band (2-4 GHz) two mmWave bands (14-16 GHz 28-30 GHz)....

Millimeter wave (mmWave) communication works in the frequencies above 6 gigahertz (GHz), with system bandwidth up to 500 megahertz (MHz) or wider. In this case, channel situations are dramatically different from existing wireless channels Third Generation/Fourth Generation (3G/4G) systems, and stationarity of mmWave could be very our former knowledge. The focus paper is study frequency spatial stationarities channels. For better understanding, we compare regions between below GHz. First,...

For radio channels with broad bandwidth resource, such as those often used for ultrawideband (UWB) and millimeter wave (mmwave) systems, the Wide-Sense Stationary Uncorrelated Scattering (WSSUS) spatial stationary assumptions are more critical than typical cellular very limited resource. This paper studies stationarity dependency of Multipath Component (MPC) parameters, concept local region (LRS) is measure physical region. LRS calculation results based on channel measurements show that size...

Currently, there is a 7GHz of unlicensed bandwidth in the United State, Europe and Japan. In this from 57GHz to 64GHz. As for Japan, falls range 59GHz 66GHz. Within high frequency bandwidth, wireless devices will be operating under mmWave technology. The technology offers at least 100 times higher data transfer rate than current Wi-Fi technology, i.e. uploading 10GB file 5 sec using mmWave, but required 10mins when Wi-Fi. very suitable short-range application hence making it ideally Personal...

It has become a popular trend in using metallic housing for mobile phone. The often posts great challenge towards the design of internal antenna which is used commonly devices. As such, it common practice that most will integrate as part This paper presents an solution phone with back cover. Main Antenna operating at several frequency bands range 700–960MHz, 1710–2170MHz, 2300–2400MHz well 2500–2690MHz, cover GSM850, GSM900, DCS1800, PCS1900, WCDMA2100, and various LTE Bands 4G cellular...

To analyze the propagation characteristics of millimeter wave (mmWave) massive multiple-input multiple-output (MIMO) channels, channel measurements in an office environment using a vector network analyzer (VNA) are carried out. Detailed parameter settings measurement system and configuration large receiver (Rx) antenna array introduced. Through dividing Rx into several sub-arrays, like spherical wavefront, non-stationarity, cluster evolution over can be found with estimation space...

The need for high data transfer rate and low latency the 5 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">th</sup> Generation (5G) technology in mobile communication has led to millimeter-Wave (mmWave) Phased Array Antenna that can offers antenna gain ability beamforming at different angles. This paper presents a 5G 26GHz Band mmWave with Phase-Shifter Integrated-Circuits (IC) as RF Front End. is made up of 64 elements arranging an 8×8...

There have been an increasing trend in using metallic housing for mobile phone. The can comes many different forms ranging from a metal frame/rim that goes around the side of phone; to with slots cut on it; full back cover covering and These improves outlook appearance mobile, adds mechanical strength However, antenna point view, such often posts great challenge towards flexibility designing reduces sensitivity performance. This paper presents approaches overcoming challenges by introducing...