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The novel application of microwave directional couplers to develop angular‐displacement microwave sensors is reported. The proposed sensor approach employs as stator a branch‐line‐type coupler arranged in transversal mode by loading its direct and coupled ports with two distinct‐length open‐ended stubs. Thus, by taking the isolated port of the coupler as the stator output node, a bandpass filtering...
In this paper, an empirical propagation model for indoor corridor at 5 GHz based on ray tracing dataset has been proposed. The model can predict the line-of-sight (LOS) and non-line-of-sight (NLOS) path loss characteristics for indoor corridor with T-junction using distances from the junction to the transmitter and receiver, while taking into account the width of the corridor.
This paper describes measurements conducted in bridge-tunnels to obtain the signal attenuation across 2 tunnels in the bridge as well as the penetration loss of train vehicle at 819.125 MHz. This helped to determine the feasibility for a TETRA base station to communicate with portable receivers from another tunnel in case of base station failure in one tunnel.
The radio propagation characteristic for a moving vehicle is studied in this paper by analyzing the receiver power of wireless communication signal at 2.4 GHz. The study includes measurement and ray-tracing based electromagnetic simulation. In both approaches, the inside and outside of the vehicle are analyzed. The measurement result agrees with the simulation one, and thus verifies the effectiveness...
For mobile communication system in an urban area, an accurate prediction model is important for site planning in order to reduce the amount of optimization done by trial and error. This paper presents the use of 3D ray tracing method to estimate the level of received power inside a university campus with 80 buildings in an area of 1.1 km2 with UMTS base stations operating at 2162.6 MHz on the rooftop...
In this paper, a method based on electromagnetic simulation is presented to investigate the vehicle penetration loss in a train for a given illumination source on the broadside at 819.125 MHz. Since the vehicle has a size of 31.4λ and is referred to as electrically large, parallel Method of Moments (MoM) with higher order basis functions (HOB) is used in order to obtain an accurate result in an efficient...
For wireless communication system in urban area, received signal level is important in determining the coverage of the system. This paper presents a model to predict the field strength level on streets inside a campus with steep terrain due to a UTMS base station at 949.2 MHz on rooftop using 3D ray tracing method. Measurements is conducted using isotropic antenna to calibrate the transmit power of...
Full wave simulations of light rail transit cabin with 2.4 GHz Wi-Fi antennas are performed to analyze the signal quality inside the cabin from different access point antenna configurations by using electric field distribution analysis. Since the vehicle is electrically large with a size of 92λ, method of moments with higher-order basis functions and parallel computation is used for accurate and efficient...
A new compact microstrip bandpass filter with a very-wide stopband is presented using dual λ/4 stepped impedance resonators with open-stub loaded at the ends. The filter offers a quasi-elliptic bandpass response with a pair of symmetric transmission zeros created at the proximity of the passband through the couplings among loading stubs and input/output feedlines. An example circuit is designed at...
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