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This paper presents the design methodology of multi-beam phased array of antennas that may provide high gain and narrow beam radiation patterns within a desired coverage range. The advantages of high energy efficiency in the coverage area provide the flexibility of applications in various area such as wireless power transmission and mobile communications. The relatively flexible mechanism to determine...
This paper proposes a review of the use of time-based arrays as RF energy providers in those wireless applications where an energy-aware transmission is of key importance. The higher simplicity and versatility of time-modulated arrays (TMAs) with respect to other modern radiating systems is deeply discussed: in particular, the multi-harmonic radiation capability of TMA is efficiently deployed in the...
Pattern recovering of conformai phased array on changing surfaces is receiving an increasing attention in the last years. This paper presents the pattern recovery of a strongly deformed conformal phased-array using the projection method. A 4 × 4 flat array is placed on a doubly curved surface. The phase compensation technique is applied first on rows, and then, considering rows as single antenna elements,...
An infinite periodic array of multimode parallel-plate waveguide sections of finite length, each of which is excited by TM modes from a pair of input waveguides, is considered. The array performance is analyzed by the method of projection mode matching on the boundaries of the regions. A few networks of the array excitation are considered for forming overlapped subarrays shaping sector flat-topped...
In this paper, high impedance periodic structure (HIPS) is applied to improve radiation pattern of the antenna element. The working mechanism of HIPS array is investigated. The structure could improve the surface-wave and the broad-beam radiation performance of the individual antenna element. It is benefit for the wide scan performance of the phased array. A microstrip antenna is fabricated and measured...
A planar tri-band rectangle-rings microstrip antenna design is presented in this paper. The antenna has three equally tuned resonant bands and also maintains consistent radiation patterns in all the operational sub-bands. The antenna has a single port and its cavity-backed waveguide-like configuration results in minimum mutual coupling levels in antenna array configuration. The antenna element is...
A new calibration method of active phased array antennas is presented in this paper. This method can be applied to the antenna arrays of various sizes and various radiating element numbers. It takes into account the edge effects and the coupling between the radiating elements. This method allows avoiding the degradations of the antenna radiation pattern caused by mismatch produced during a scanning...
In this paper, a phased array antenna is designed at millimeter-wave frequency bands for future 5G based smartphone applications. The proposed antenna is a novel open slot-PIFA antenna made on a low cost FR4 board. The antenna array covers a frequency range of 26–32 GHz with a bandwidth of 6 GHz. The antenna exhibits a very good radiation pattern when integrated with the mobile phone chassis. The...
This study presents the design of a dual-band cavity-backed phased array antenna with wide-angle scanning capability in K/Ka bands for the geostationary (GSO)-fixed satellite service (FSS). To reduce the losses and mutual coupling, a novel antenna element similar to the cavity-backed Strip-Slot-Air-Inverted-Patch (SSAIP) is proposed as an element of designed array of 81 elements. Wide-angle scanning...
From the viewpoint of diversity, this paper presents the applications of element-level pattern diversity (ELPD) technique in the synthesis of array antennas. The application examples include the linear array antennas, the concentric loop array antenna, conformal array antenna and the time-modulated array antenna. With one more degree of freedom in the synthesis, this technique exhibits many advantages...
This manuscript introduces a new vision on the implementation of spatial diversity with beamsteering capability, by suppressing the typical beamforming networks of antenna phased arrays and replace them by Reconfigurable Transmitar-rays. Consequently, the radio frequency components, i.e. RF-chains that compose such systems, were replaced by a device with the capability to perform two-dimensional beamsteering...
In this paper, a test bed for LTE-Advance Beamforming is proposed. The test bed is composed of an 8×1 monopole antenna array matched at the mid and higher bands for LTE operating in Europe, wide band transceivers with agile architectures provided by Analog Devices, and mid range FPGA from Xilinx for antenna weight calculation and beamforming on the fly. The test bed is promising to give a useful mean...
The impact of the phase compensation method on transmitarray (TA) performance is studied here in terms of directivity, gain, aperture efficiency, and beam scanning capability. The analysis has been done by considering generic TAs based on ideal unit-cells and illuminated by an ideal focal source with a gain of 10-dBi and 100% of efficiency. The phase compensation on the array aperture can be implemented...
A directional modulation system based on phase only modulation is demonstrated with a 2 element array. The hardware setup is discussed, and measurement results compared with simulations to analyze performance. We demonstrate how directional modulation offers greater security in directions other than intended, in contrast to conventional modulation.
In this paper the detection of Orbital Angular Momentum (OAM) modes at a carrier frequency of 10 GHz is evaluated by modelling and by experimentation. A 2-element antenna array together with the phase gradient detection method are used to determine whether a mode 0 or −1 is present, where our results verify that a distinct difference in measured phase profile between the two modes is distinguishable...
This paper presents the design and accurate simulation of two small and medium-sized antenna arrays working in Ka-band (20 GHz). Feeding networks and radiating panels are studied separately and two methods for extracting the scattering matrices of the radiating panels are presented and compared. These developments are an important step of the further modelling of larger arrays.
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