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In this paper, the low-profile radiation-pattern controllable antenna is presented. The diskloaded monopole antenna (DLMA) with four slits is designed for low-profile radiation element. And, planar CRLH-PE composited of the mushroom structures is designed. It is cleared that the DLMA and the CRLH-PE with the height of 0.03λ at 750 MHz can couple each other. The radiation patterns can be controlled...
In a differential transmission line, a large common-mode radiation is excited due to asymmetry. To suppress the radiation, the differential line must be designed electrically symmetric. In this paper, the imbalance difference model, which was proposed by the authors for estimation of common-mode radiation, is extended to apply the differential signaling system. The authors focus on two pairs of differential...
In this paper, we calculated radiated emission from multilayered PCBs using the common-mode antenna model. First, the common-mode antenna model will be explained. The common-mode antenna model is a simple model that consists of an antenna element and excitation sources only. Radiated emissions from 3-layered PCBs are then calculated by the common-mode antenna model. We will illustrate that the 3-layered...
The pattern-controllable novel small antenna with CRLH-PE has been proposed. The distance between the radiator and the parasitic element of the proposed antenna is 1/20 of wave length. The directivity in arbitrary direction is obtained by resonation of an appropriate PTLH-PE in the usable frequency band of the dipole antenna. The minimization of the radiator is future study.
In this study, a composite right-/left-handed transmission line (CRLH TL) is used as a parasitic element. It is shown that a right-handed (RH) dipole antenna with the CRLH parasitic element has band rejection characteristics. Moreover, transmission characteristics and electric field distribution confirm that mutual coupling between the two dipole antennas can be reduced by using CRLH parasitic elements...
In this paper, the common-mode antenna model, which can estimate the amount of common-mode radiation quickly and accurately, was applied to a board-to-board interconnection structure with a connector. The inductor model is introduced as the connector model for improving accuracy of the common-mode antenna model. By using the inductance, which was calculated with the commercial electromagnetic field...
We have proposed a common-mode antenna model that is designed specifically for estimating common-mode radiation from printed circuit boards (PCBs) very quickly. The model is composed of an antenna that has the same geometry as the adjacent ground plane of the PCB and an excitation source based on an imbalance difference model. The excitation source is provided by the product of Deltah and VN, where...
This paper reports results of investigation on the radiation characteristics of a vertical rod antenna in manhole at 430 MHz for the purpose of allowing radio access to water pipe sensors. Field distribution in and around the manhole was calculated by FITD 3D simulation. It was found that a portion of generated waves penetrated through the asphalt layer around the metal top to radiate into the space...
A stub-loaded folded dipole antenna is proposed for digital terrestrial TV reception. The antenna has a pair of lines as stubs inside a folded dipole. The prototype antenna printed on polyethylene terephthalate (PET) film has dimensions of 20 by 240mm with a line width of 1 mm. The antenna exhibits a relatively flat gain characteristic from 0.6 to 1.9 dBi with a stable figure-of-eight radiation pattern...
Characteristics of a rectangular-cavity-backed cloverleaf slot antenna are investigated numerically and experimentally. The method of moments is used to calculate the antenna characteristics where the effects of the cavity are taken into account. The minimum axial ratio of 1.11 dB and the maximum gain of 10.6 dBi are obtained at 2.19 GHz. The frequency bandwidth for the axial ratio (AR) (< 3 dB)...
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