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This paper presents the design and experiment of an antenna subarray for wideband and dual linear polarized phased arrays. The proposed antenna is a one-dimensional linear array which consists of two feeding networks for each polarization and radiating elements. The suspended stripline is used as the transmission line of the feeding network because of its low loss and low mutual coupling. The radiating...
Crank shaped slot is a well known compact slot that can be settled on a narrow wall of a waveguide. However, it is difficult to match the slots to a feed waveguide without matching circuit because the crank shaped slot has a large resonant conductance. In this paper, Z shaped slot partially overlapping the waveguide wall to achieve smaller conductance is proposed. In the proposed slot, the resonant...
An antenna RCS reduction using circulator and phase shifter is one of promising RCS reduction techniques. In this RCS reduction method, the antenna mode scattered field, which is the re-radiated field of antenna, is controlled by the phase shifter to cancel out the structural mode scattered field. In this paper, a method is proposed to measure the amplitude and phase relationship between the antenna...
We have been investigating point-to-multipoint wireless communication suitable for the use inside Information and Communication Technology (ICT) equipments to accommodate demands for weight saving, environmental lifecycle CO2 reduction and improvement of assembly/maintenance efficiency by means of replacing communication wire harnesses with wireless technology, that is wireless harness. Through the...
A phase optimization method to achieve an improvement of the radiation performance of a phased array is proposed. In the proposed method, phases are optimized with taking into account the effects of the amplitude and phase errors at every phase shift of phase shifters on the radiation performance. The optimization method is based on the local search and the simulated annealing method. By applying...
We have been developing a 2.4 GHz point-to-multipoint wireless communication system suitable for use inside mechatronics ICT (Information and Communication Technology) equipment to replace wire harnesses inside equipment with wireless communication as a useful technique of weight reduction and simplification of system assembling [1]. One of the critical problems of such applications is that antennas...
In satellite phased-array antennas, mechanical distortions, which may be due to vibrations caused when launching the satellite into the orbit or thermal variations in the orbit, result in significant degradation of electrical performance. In this paper, two on-board calibration methods are proposed for such mechanical distortions: One compensates for the element phase differences resulting from mechanical...
We have been investigating point-to-multipoint wireless communication suitable for the use inside ICT (Information and Communication Technology) equipments to accommodate demands for weight saving, environmental lifecycle CO2 reduction and improvement of assembly/ maintenance efficiency by means of replacing communication wire harnesses with wireless technology, i.e., wireless harness. Through the...
The development of an efficient and accurate location sensing systems for indoor environments, based on the received signal strength (RSS) data, is usually a challenging task. In this paper, we discuss the feasibility of using Gaussian Processes (GPs) regression for learning based indoor localization algorithm. The GP is one of the machine learning algorithms that can be used to model a complete RSS...
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