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In this paper, a simplified method of digital predistortion (DPD) based on the feedback for single power amplifier (PA) is proposed to linearize beamforming Multiple-Input Multiple-Output (MIMO) transmitter. In MIMO beamforming transmitter, a couple of radio frequency (RF) channels are paralleled to transmit signals simultaneously, it is almost impractical to perform linearization for each channel...
In this paper, a novel compact triple-band frequency reconfigurable antenna array backed on EBG plate and based on integrated bias lines is proposed. It consists of a 4×4 reconfigurable antenna array, a wide-band feed network, a dual-band EBG plate and integrated bias lines. By applying a EBG structure, the distance between antenna array and reflective plate has been reduced by 76.0 percent. The proposed...
A compact triple band antenna array for GNSS application, covers GPS L1, L2 and L5 frequency bands, is proposed in this paper. The array is comprised of 4 radiating elements spaced 0.47 wavelength apart (center to center) at the GPS L1 band and filled with dielectric material and three stacked patches. It is observed that due to the compactness of the antenna array the mutual coupling degrades the...
In this paper, a novel configuration of longitudinally slotted waveguide antenna array, which has a single waveguide cavity, is presented. To broaden the bandwidth of the array, a novel feeding structure is introduced. A 16-elements uniform linear array at X-band was designed. The simulated bandwidth of S11 ≤ −10dB is 10.5%, and the antenna has good radiation pattern in the bandwidth. The design considerations...
A flexible micro-electro-mechanical system (MEMS) array antenna is presented which is used in the space satellite communication system, and its bending properties are studied in order to maintain its radiation characteristics as its plane state after deployment from bending. The flexible MEMS array antenna on an LCP substrate is designed with a central frequency of 30 GHz, and its radiation characteristics...
The process of designing triple-mode seeker antenna is provided, in the middle of which there is a hole. The method which optimizes element amplitude and designs feeding power splitter is discussed. Finally, the model of antenna is simulated in the HFSS, and the result proves that the method of design is right.
A new tri-mode cavity-backed patch antenna for Q-band applications is presented. Two resonances are introduced to a conventional rectangular patch by adding an annular slot and two unequal U-shaped parasitic elements, which achieves the broadband characteristic. Due to the high isolation of the substrate integrated waveguide (SIW) cavity, two antenna elements are placed close to each other for the...
A MIMO antenna with small size and ultrawideband (UWB) is proposed in this paper. The MIMO antenna has four basic antenna units that are placed vertically with each other and four embedded U-shaped metal frames. The improved isolation functions are achieved by utilizing the orthogonal polarization between each unit. It is demonstrated that this antenna can well meet the requirements of isolation and...
A low-sidelobe substrate integrated waveguide (SIW) leaky wave antenna (LWA) array with non-uniform transverse slots is proposed. By tuning the length of the radiating slot etched on the SIW, the sidelobe level of the design can be effectively reduced. A four-way SIW power divider with equal outputs of same phase and amplitude is designed to feed a four by one array. The proposed LWA array shows a...
This paper proposes a compact gear-type microstrip circular antenna (GTMCA) to generate orbital angular momentum (OAM) for wireless applications. The antenna consists of a microstrip circular loop which connected with eight rectangle patches, each rectangle patch rotating arrangement on a substrate in sequential with an equal inclination angle of 45°. The working principle of proposed antenna is analogous...
A key challenge in designing tightly coupled dipole arrays (TCDAs) and connected arrays is common-mode resonance, which could dramatically influence the bandwidth. In this article, a double dipoles per cell structure is applied in TCDA unit design in order to solve the resonance by moving the resonance frequency above the operation band. The simulation results show that the double dipoles per cell...
An effective imaging approach based on compressed sensing (CS) and fast iterative shrinkage-thresholding algorithm (FISTA) is proposed to realize the two-dimensional imaging in the single-input multiple-output (SIMO) radar system. In comparison with the traditional imaging method based on matched filtering, considerable simplification of the hardware structure would come true through the implementation...
Usually, the stray signals from antenna test environment and compact antenna test range (CATR) system may cause errors in the measured patterns. In order to improve the measurement accuracy of a specific antenna test system, the techniques about antenna pattern correction for mitigating the effects of these stray signals are required. In this paper, a two-unit virtual array method and its extended...
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