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A low profile monopolar patch antenna with conical beam radiation pattern and high gain performance is presented in this paper. The antenna has a simple structure which consists of a monopolar patch, a ground and a set of shorting pins. To enhance the gain performance, the antenna is designed to operate with TM03 mode and TM04 mode. The proposed antenna operates from 2.41 to 2.51 GHz for the VSWR...
Future communication systems will utilize multiple antennas and beamforming to a larger extent than what has been done before. Design and evaluation of systems with many antennas and large bandwidth requires channel models with good accuracy in angle and delay. An angular resolution down to one degree, and bandwidths of several GHz, are foreseen for the future 5G wireless systems. For this purpose,...
We evaluate the user rate performance of massive MIMO small cells in hot-spot areas. In particular, with the use of the 28GHz millimeter wave band ray-tracing channel data generated according to the realistic map in Shinjuku, Tokyo, Japan, we investigate the user-specific rates in an area of 150m×120m. The results show promising rate performances with the use of a variety of beamforming schemes in...
A novel triple-band three-port diversity dipole antenna for LTE access points is presented. The impedance bandwidths, determined from RL > 10 dB, can reach about 120 / 872 MHz (17.1 / 33.9 %) for the 700 / 2300 / 2500 MHz operating bands, respectively, which are covering the required bandwidth for LTE system. This proposed triple-band dipole array also provides maximum peak antenna gains and efficiencies...
An omnidirectional horizontally polarized antenna with an ultra-wideband impedance and radiation bandwidth is proposed in this paper. The connected Vivaldi antenna array is firstly applied to realize a UWB horizontally polarized antenna with good omnidirectional radiation properties. The designed antenna exhibits a relative impedance bandwidth of 163.17% for |S11|<-10dB (1.45–14.3GHz). Meanwhile,...
Reflectarrays and transmitarrays are extremely important in the applications of terahertz (THz) technologies, as they feature merits like high gain and low cost. In this work, a reflectarray and a transmitarray are designed at 300GHz. A 32 × 50 offset-fed wideband reflectarray antenna, based on single-layer elements with a large and linear phase response, shows a fixed beam direction without frequency...
An SIW cavity-backed dual loop antenna with broadband and circular polarization (CP) operation at Ka band is presented. The dual loop is on the top metal layer of the SIW and is coupled-fed by a longitudinal slot which is on the bottom metal layer. A microstrip-SIW transition is designed as the feed structure. Simulation results show that the antenna has a common bandwidth of 11.1% from 34 to 38 GHz...
A broadband probe-fed array antenna for Ku-band applications covering 10.7–12.75 GHz, a bandwidth of 2.05 GHz, is proposed. The array antenna adopted 4×4 configuration with a parallel branch feeding network to set up required equal current magnitudes and phases. The antenna element in the array utilizes a vertical pillar to reduce the surface wave loss and increase operation bandwidth. The bandwidth...
Improvement in gain as well as bandwidth of microstrip antenna using reactive impedance surface and Fabry Perot cavity resonator is proposed. Suspended microstrip antenna (MSA) is designed on reactive impedance surface (RIS) backed FR4 substrate. RIS improves bandwidth, gain and efficiency of antenna due to reduced coupling between MSA and ground plane. This MSA backed RIS is placed in a FPC resonator...
This paper describes a low-profile broadband 2×2 metasurface-based circularly polarized (CP) array antenna using a sequentially rotated series-parallel feed. The single element is a truncated corner square patch sandwiched between the ground plane and the metasurface of a lattice of 4×4 metal plates. These antennas are incorporated with the feeding network to achieve broadband operation. The 2×2 metasurface-based...
The key indicators of analog to digital converter (ADC) are effective number of bits (ENOB) and spurious-free dynamic range (SFDR). ENOB would affect the input signal to noise ratio (SNR), and SFDR indicates the degree of spurious introduced by non-linear. The characteristics of multi ADC in antenna array would not be the same, which make the quantization noise introduced by ENOB and spurious indicated...
A single input and multiple output (SIMO) antenna configuration is presented for real time data acquisition. The proposed approach can provide both range and angle information in a plane. A method of localization of multiple point objects (targets) in azimuthal plane is realized by employing one stationary transmitting antenna and dynamic receiving antennas positions. FMCW chirp signals are used as...
A new and very simple way of implementing defected ground structure (DGS) in a microstrip patch antenna is presented. The dimension of DGS is exactly same as the dimension of radiating element. There are two different DGSs implemented in this paper. The DGSs are complement of each other with respect to their structures. The antennas with these complementary DGSs show four different frequencies of...
Massive MIMO has shown the great potential in improving the achievable rate with a very large number of antennas. However, several critical challenges in designing the analog front-end and coordinating the large-scale antenna array have to be carefully addressed. Does there exist an alternative that can achieve similar system performance to massive MIMO with a simpler design? In this paper, we show...
Magnetic Induction (MI) is a promising solution for wireless communications in complex environments, such as oil reservoir, underground, indoor, and underwater. Due to the inherent electrically small size and simple structure of the magnetic coil antenna, it suffers from low radiation efficiency, extremely narrow bandwidth, and dramatic polarization loss. Recently, significant efforts have been made...
With the advent of new technologies every day and with each technology more bandwidth intensive than the previous, The need for some transformative technology to coop with the bandwidth problem is ever growing. The current technologies like LTE uses MIMO, OFDM and coding techniques that have reached their limits and provide an almost theoretical efficiency but they also in the near future may be uanble...
Small cell mesh wireless systems capable of high data rates seem likely to play a key role in the new proposed IEEE802.11ad based 5G networks. Key to these architectures will be antennas that can both support very wide bandwidths and at the same time deliver high gain performance whilst maintaining omnidirectional characteristics. Such attributes are often considered to be mutually exclusive or require...
In the present paper, the design of an artificially anisotropic substrate (AAS) with an aperture-coupled feeding structure is proposed for the generation of circular polarization (CP) at 28 GHz. The radiator configuration is constructed by assembling thin sheets with different relative permittivities as a stack for generating different effective permittivities for the wave components. It is demonstrated...
In the summer of 2011, I was awarded a Consolidator Grant by the European Research Council titled "Advanced Antenna Architectures for THz Sensing Systems (AAATSI)". The grant lasts 5 years and this contribution reports on the significant technical advances that were obtained in the first 4 years. The activities are oriented to four scientific themes: Quasi Optical systems, Leaky Lens Antennas,...
A compact, high gain printed dipole antenna is proposed for GPS application. As modern wireless devices have become more portable and cost effective, they have become an integral part of the day to day life of civilized society. A single element printed dipole antenna at 1.575GHz is designed and developed using FR4_Epoxy substrate. Its subsequent development into two elements and four elements array...
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