| Integrated Substrate gap waveguide(ISGW)is a new type of transmission line formed by artificial ideal magnetic conductor(AMC),ideal electrical conductor(PEC)and micros-trip line with printed circuit board(PCB)technology.The electromagnetic gap(EBG)formed by PEC and AMC in the transmission line plays a similar role as band-pass filter,The ISGW transmission line can only transmit TEM mode electromagnetic waves of a certain frequency along the micro-strip line.Because ISGW transmission line has good electromagnetic shielding characteristics,better integration characteristics,low loss,better suppression of surface wave and so on.Therefore,ISGW has broad prospects in the applic'ation of millimeter wave circuits and antennas.In this paper,the application of electromagnetic dipole antenna based on ISGW technology in millimeter wave is studied.(1)Researching the development of transmission line history,comparing the performance of ISGW transmission line with that of traditional transmission line,finding out the advantages and challenges of ISGW.The transmission principle of ridge ISGW and micro-strip ISGW transmission lines is analyzed.A transmission line with stopband of 20?31 GHZ is designed.The design steps and parameters selection rules of micro?strip ISGW transmission line are given.The transmission line has good return loss and insertion loss.(2)A slot-coupled ISGW electromagnetic dipole antenna covering 5G band is designed.The antenna feeds the electromagnetic dipole loaded on the slot through the coupling between the slot and the micro-strip line by etching a slender rectangular slot on the PEC layer of the ISGW transmission line.The feed part and radiation part of the antenna are separated by the PEC layer,so they do not interfere with each other.In this paper,the principle of antenna is analyzed by equivalent circuit and field distribution,and the method and steps of antenna design are given,as well as the influence of structure change on antenna performance.Through the improvement of the electromagnetic dipole structure and the antenna feeding mode,the antenna achieves a 36.5%-10dB impedance matching bandwidth,which covers the research and application of the 26GHz frequency band in almost all countries,and achieves an average gain about 8.5dB(3)In order to further increase the gain of the antenna,and enhance the practicality of the antenna.In this paper,an ISGW-based one-two-divided power splitter is designed,the 5G-band electromagnetic dipole antenna designed in the paper is loaded on the power splitter to form a 1×2 antenna array.The ISGW transmission line is combined with the slot feed,which makes the position of the radiating element can be flexibly arranged.The 1×2 antenna array achieves a-10 dB impedance bandwidth range of 23.2GHz?28.2GHz,which completely covers the research and application range of 24.25?27.5GHz in the 26 GHz frequency band of China,and the overall gain of the antenna is improved 2.6dB,port isolation is less than-15dB,which has a high practical value. |
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