| As the low frequency bands of the electromagnetic wave spectrum is rather congestive,researches on radar and telecommunication applications are expanding to higher bands,such as millimeter wave bands.As an indispensable energy convertor of the system front end,researches on high performance and cost effective millimeter antenna are getting more and more popular.In this thesis,millimeter wave slot array antennas are designed based on a novel transmission line called gap waveguide.The main works are summarized as follows.1)Researches on gap waveguide transmission characteristics:Recent advance about GWG and antenna designs based on it is introduced according to massive referential papers.The types and characteristics of GWG are introduced.The transmission performance of GGWG is analyzed quantificationally.To form an antenna array of GGWG,two methods are presented.One is using a subarray fed by GGWG,the other one is modifying the EBG structure.2)Design of the GGWG fed high mode cavity slot array antenna:Using EM simulation software HFSS to extract parameters of slots with loaded cavities in the array models.A high efficiency uniform array is formed.By applying Taylor distribution on the coupling slots,a low side-lobe plat array is designed.It can satisfy the requirements for the mobile forward collision avoidance radar antenna.3)Design of GGWG slot array antenna based on a novel flat printed dielectric EBG structure:A novel flat printed dielectric EBG structure is introduced and analyzed.Base on this structure,GGWG remain low loss.Compared to pin structure,it is also easier to fabricate.Besides,the smaller dimensions of the structure make it possible for GGWG to form an array.An array based on the novel structure is designed and shows reasonable performance. |
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