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Harmonic emissions have been changed in distribution networks, with respect to frequency range and magnitude, due to the penetration of modern power electronics systems. Two new frequency ranges 2–9 and 9–150 kHz have been identified as new disturbing frequency ranges affecting distribution networks. This paper presents the effects of grid-connected three-phase systems with different front-end topologies:...
A novel single feed compact microstrip patch antenna with slits and symmetric-fractal boundary loading is proposed and investigated for circularly polarized (CP) radiation. The compact size of the antenna is realized by insetting four pairs of equally spaced slits of equal lengths to the boundary of square patch along the patch axis. Further size reduction and CP operation is achieved by symmetrically...
This work presents a low power injection locked on-off keying (OOK) transmitter (TX) for the Medical Device Radio (MedRadio) communication band (401–406 MHz), which is suitable for health care applications. The TX is based upon a surface acoustic wave resonator (SAWR) oscillator, which directly generates a stable RF signal at 403.6 MHz and completely removes the power hungry frequency multiplying...
A novel Smith-Apollonian Gasket (SAG) fractal design for microstrip patch antenna is proposed in this paper. The proposed antenna design is a combination of Apollonian Gasket with Smith Chart. The SAG antenna has a multiband behavior in the frequency range from 3 GHz. to 10 GHz. The different frequencies generated from the different iterations can be used for different applications. Frequencies from...
A novel fractal microstrip patch antenna has been proposed which is based on the Smith Chart design. The Smith Chart circles consist of two types of circles. The proposed design of fractal microstrip patch antenna has exploited one set of Smith Chart circles. The dielectric material used for the proposed microstrip patch antenna is Rogers TMM4 with a dielectric constant of 4.55 and the patch is made...
In this paper we propose that a dielectric dot on the top of a ground plane could act as an antenna in optical frequency range. We investigate its electromagnetic properties numerically and observe that its behaviors are similar to dielectric resonator antenna in radio frequency. Further we optimize the aspect ratio of optical dielectric resonator antenna based on return loss, study the fundamental...
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