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• W2346579525 abstract "It is necessary to evaluate the characteristics of antenna built-in mobile devices because their emission characteristics are changed due to the device size and the antenna mounting position. Several methods have been proposed so far as for measuring the antenna built-in radio equipment, i.e. the pattern integration method inside anechoic chamber [1], the random field method (RFM) measured under real propagation environment [2], Wheeler cap method [3], the method with compact shield box [4] or with the reverberation chamber [5] and the partial spherical scanning method with a reflector [6] etc. These techniques have the demerit that the measuring frequency and antenna structure are limited. Moreover, there is the demerit that large scale facility is necessary to move the rotator. We propose an electric power measurement method by simple facility to overcome these demerits. We should decrease the influence of the antenna directivity in the measurement to evaluate the radiation power of antenna built-in mobile devices. To decrease the influence of the antenna directivity and to measure with easy equipment without rotators, it is possible to apply the field simulator which has been used to measure the effect of antenna diversity for radiation power measurement [7]. This paper shows the configuration of a proposed measurement system in the next section. Then, we discuss the size of measurement area inside shield box to neglect the influence of antenna directivity of the mobile device. Finally, we carry out the simulation considering the effect of the phantom to simulate the antenna in realistic environment and we conclude in section 4. 2. Basic simulation of Field simulator In this section, we show the system configuration of the field simulator and simulation results of radiation power measurement to reduce the influence of directivity of mobile device. Figure 1 shows the configuration of the proposed field simulator. We describe a procedure of field simulator in the following. First, E-field generated from mobile device (Tx) with the transmitting frequency of 2GHz is received with multi antennas arranged along the wall inside the shield box. Second, we change phases of received voltage obtained in each receiving antenna with phase shifter at random. Finally, we obtain CPDE (cumulative probability distribution of the electric field) by synthesizing outputs from each receiving antenna at every phase. It is an easy measurement system, because neither rotator nor moving components are used. It is necessary to achieve the measurement environment that the electric power of the coming wave is randomly distributed like outdoor to decrease the influence of the directivity. This is evaluated by the CPDE with the Rayleigh distribution. Next, we examine the radiation power measurement of the mobile device taking into the influence of the antenna directivity. In this simulation, we use a metallic cube, the length of each side being 5λ. We calculate the excitation voltage of the receiving antenna by using the Ray-trace method. Figure 2 shows the CPDE obtained for the antenna arranged in appropriate locations. From this result, Rayleigh environment is given in the metallic shield box because CPDE is close to the Rayleigh distribution. Figure 3 shows the CPDE obtained when the directivity of the transmission" @default.
• W2346579525 created "2016-06-24" @default.
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• W2346579525 date "2009-01-01" @default.
• W2346579525 modified "2023-09-26" @default.
• W2346579525 title "Radiation Power Measurement Method of Mobile Device Using Field Simulator" @default.
• W2346579525 hasPublicationYear "2009" @default.
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