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A three-dimensional model is created for a building structure to study the radiation exposure from base-station antenna operating under a coexistence of GSM900 and UMTS900. This model can be used to analyze the radiation distribution of the building structure in the frequency bands of GSM900 and UMTS900 and predict the level of field variation due to the deployment of UMTS900. Full wave electromagnetic...
In this paper the coverage of outdoor public WiFi hotspot and its radiation safety are studied through full-wave electromagnetic simulation. The simulation model includes both the WiFi antennas and the nearby building structures. In order to get a good balance between accuracy and computational efficiency, the simulation is based on the Method of Moments (MoM) with higher-order basis functions (HOBs),...
A novel reconfigurable bandpass filter with multiple quasi-elliptic passbands is presented in this paper using defected ground structure and PIN diodes. In contrast to the popular controllability on the center frequency or bandwidth given by conventional reconfigurable bandpass filters, the proposed filter can be controlled to switch between single, dual or triple bandpass characteristics. All these...
A prediction model is created and presented in this paper to study the radiation level from mobile telephony base-station antennas using electromagnetic (EM) field simulation. The model concerns only the GSM antennas at 900 MHz. As an example, a residential apartment is chosen to be modeled and simulated using the method of moments, and compared with the on-site EM field measurement. As the three-dimensional...
A compact dual-band bandpass filter with an improved upper stopband using defected ground structure is proposed. This filter offers quasi-elliptic responses at both the passbands, and the upper-stopband performance is improved by using end-coupled microstrip lines loaded with non-uniform shunt open stubs. An example dual-band bandpass filter is designed to demonstrate the effectiveness of the approach...
A novel compact dual-band bandpass filter based on a simple defected ground structure is proposed. This filter offers quasi-elliptic responses at both the passbands, and all its four transmission zeros near the passbands can be controlled to design for a wide range of center frequencies and bandwidths, without degrading the in-band performance in general. In this paper two dual-band bandpass filters...
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