Abstract-A series of curved microstrip antennae with defected ground structure for multiband are proposed, which are more smaller, conveniently conformal, wider radiation beam and suitable for WLAN terminal for different environment. The relation between the main geometry parameters and the antennas' characters are studied with the cavity model method and EM simulation, and the optimum size antenna is achieved later. If keeping the other parameters but increasing the curving angle α, the return loss is almost good at f = 2.45 GHz, but poor at f = 5.25 GHz and 5.8 GHz. After slight tuning the key parameters, these curved antennae all can work at f = 2.45 GHz, 5.25 GHz and 5.8 GHz, and their patterns in the plane that is vertical to the curve axes become more wider or even omnidirectional with the curving angle α increasing, which are verified by experiment, their measured gain are 2 dB-6.3 dB.
In second language acquisition, individuals are under the influence of the phonetic system of their mother tongue. This paper studies the phenomenon of negative phonological transfer in the learning of English among Northeastern Chinese children. This paper mainly uses Praat to determine how common for Junior High school students in Jilin to experience negative transfer in their oral English acquisition. We specified the phonemes susceptible to the negative transfer. In conclusion, we discussed the potential improvements in Jilin areas' English teachers' teaching methods to offset the transfer effects. The analysis intends to assist English teachers in the Jilin Region in taking countermeasures to neutralize the negative transfer effects of Dongbei accents on English education.
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