Miniaturization Of Ebg Structure And Its Antennas

In recent years there has been a fast development in the research of electromagnetic band -gap (EBG) with high impedance surface, and much work has been done both theoretically and experimentally. EBG structures have the properties of band-gap feature and in-phase reflect feature, and many potential applications in communications can be expected. To realize EBG structures miniaturization and find an EBG structures with a larger absolute gap are still the research directions in this field.In this paper, we analyzed EBG structures' performance when using some methods which can miniaturized the EBG structures, and we introduced a new method—via position shifted method, which the EBG structures' equivalent inductance will increase by regulating the via position. To validate the method, we used the method in an EBG structures which have loaded in capacitance, and simulated the EBG structures using method of suspended microstrip on software IE3D/Zealand. Our computational analysis shows that the center frequency of the EBG structure's band-gap which using the new method is 4.85GHz compared with the EBG structure's which have only loaded in capacitance is 3.85GHz in the same condition, otherwise, the relative bandwidth increased from 9.28% to 11.4%.The application of EBG structures is one of the prevail directions of EBG structures research. The antenna is a front-end of communications system, the performance of the antenna play an important role to the whole system. To achieve the miniaturization and improved antenna gain, applied EBG structure on antenna is an important direction of development in the antenna designing. At present, EBG structure the application of EBG structure in microwave antenna much has been achieved. This paper discusses the two main characteristics of the EBG structure—band-gap feature and in-phase reflect feature, and discussed in-depth its band-gap characteristics which parameters bring. In this paper, we designed a microstrip patch antenna and a dipole antenna, and analyzed antennas' using software Ansoft/HFSS. Our computational analysis shows that achieved lower section plane of the dipole antenna while applied EBG structure as its reflect plane, and applied EBG structure in the microstrip patch , The successful suppression of the antenna in SAW and Increased microstrip patch antenna gain.On the base of via position shifted method to achieve the miniaturization of EBG structures, we introduced increased EBG structures band-gap method -multi-via method, and simulated the EBG structures we introduced using method of suspended microstrip on software IE3D/Zealand. Our computational analysis shows that the band-gap of the EBG structure increased from 1.2GHz to 3.2GHz, and relative band-gap also increased from 57.1% to 80.5%. At the end of this paper, we combined multi-via method and EBG structure assembled method, and designed a super-wideband stop-band EBG structure that can broaden relative band-gap to 120%...