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An X-band FMCW sensor is developed with beam-scanning capability to reliably detect the vehicles with different shapes. Two-element transmitting antenna array is designed with single phase shifter and an unequal power divider to reduce the cost and achieve compact size of 4.5 cm × 4 cm. Experiments successfully confirm precise identification of the incoming vehicle and its occupancy.
In this paper, we propose and design a coaxial-line fed slot array with a waveguide-to-coaxial transition using a crank-shaped slot. We analyze the 8×8-element trapezoidal array with the designed transition. The bandwidth for VSWR less than 1.5 is 2.1% in the waveguide for boresight radiation and 2.0% in the waveguide for tilted radiation from 77 to 81 GHz.
A 94 GHz two-dimensional (2D) millimeter-wave beam-scanning network using low temperature co-fired ceramic (LTCC) technology has been proposed. It utilizes two Butler Matrixes, four 3-dB directional couplers and four phase shifters to provide eight groups of phase difference on one dimension and four groups on another dimension. Combined with 2×4 SIW slot antenna array, it can achieve eight beams...
In the research project, a design concept of the mm-wave antenna array operating at 38 GHz is proposed by using a 64-element micorstrip patch antenna array. Theoretical and experimental study validates the design approach for the use of the Fifth generation (5G) wireless communication system.
This paper presents a three-axis decoupling stubloaded parallel dipole array antenna with tri-orthogonal polarization directivity. The decoupling characteristics are realized using the phase shifter composed of a quarter-wavelength stub placed at two sides of three parallel dipole array antenna for creating the opposite phase of the current distribution. Further, the quarter-wavelength stub is operated...
This paper presents performance enhancement of a conventional circularly-polarized (CP) microstrip patch array using anisotropic metasurfaces. In addition to boresight gain, axial-ratio and impedance bandwidth amplifications, sidelobe levels suppression were also focused.
In this study, technques of cross-polarization suppression for the coplanar waveguide (CPW)-fed monopole antenna with an asymmetric ground plane have been presented. By appropriately etching a notch and embedding a four-slot array in the ground plane, the horizontal current component of the ground plane can be efficiently decreased, thus suppressing the cross-polarized radiation at the broadside direction...
In this paper, a novel beam-forming system consisting of 16 subarray antennas, each containing four aperture-coupled patch antennas, is presented in smart wireless communication systems. Each of the subarray antennas was able to switch its beam patterns toward one of nine zones over a half space by adjusting the specific phase delay angles among the four antenna elements. Furthermore, when all subarrays...
A 60GHz-band compact-range wireless access system using a large array antenna can provide an uniform signal reception zone (less than 14 m distance from the antenna) and an almost multipath-free propagation environment. To evaluate the system performance, a wireless communication system for demonstration is constructed and the bit error rate (BER) and the signal-to-interference-plus-noise ratio (SINR)...
Multi-band antenna elements consisting of a loop slot for lower-band and two slots for higher-band are designed for cellular base station antennas. This antenna is fed by Tri-plate line to eliminate feeding coaxial cables and connectors of feeding network circuits and its frequency bands are 0.8/0.9 GHz and 1.7/2.0 GHz. This paper discusses the design method of multi-band polarization diversity array...
This study proposes a simple self-calibration system that involves applying the phase-match method (PMM) in the far-field calibration of a deployed active array. An 8-element microstrip antenna array was applied to validate the proposed method experimentally.
An array antenna is composed antenna elements and feed circuit network, and different substrates are often used to suppress degradation of antenna performance. Conventionally, interconnecting structure such as connectors or jigs in order to connect these substrates to each other. ACP is suitable to connect antenna substrate and feed network. In this paper, a 16-element feed-circuit-integrated patch...
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