公开(公告)号：US11545757B2

公开(公告)日：2023-01-03

申请号：US16720640

申请日：2019-12-19

申请人： Nima Bayat-Makou ,  Ke Wu ,  Ahmed Abdelwahed Kishk

发明人： Nima Bayat-Makou ,  Ke Wu ,  Ahmed Abdelwahed Kishk

IPC分类号： H01Q13/28 ,  H01Q13/22

摘要： A single-layer substrate integrated directive broadside beam leaky-wave antenna is provided. Opposite ends of a leaky-wave structure are fed with anti-phase versions of a common signal, resulting in broadside frequencies being set apart from the open stopband. To achieve this, the common signal can be split into two equal length paths, one including a perfect electrical conductor (PEC) reflector and the other including a perfect magnetic conductor (PMC) reflector. Alternatively, the common signal can be split into two paths which differ in length by a half wavelength. A power splitter and feed horns can be used in the respective paths. The leaky-wave structure may have transverse slots which increase in width toward a midpoint of the structure. The antenna can be formed in a single planar portion of a lithographic structure, for example by patterning an upper conductive layer thereof.

公开(公告)号：US11095011B2

公开(公告)日：2021-08-17

申请号：US16486189

申请日：2018-02-16

申请人： Shokry Ibrahim Abdelrazak Shamseldin ,  Ahmed Abdelwahed Kishk ,  Mahmoud Sobhy Elsaadany

发明人： Shokry Ibrahim Abdelrazak Shamseldin ,  Ahmed Abdelwahed Kishk ,  Mahmoud Sobhy Elsaadany

IPC分类号： H01P1/387 ,  H01P1/383

摘要： Microwave circulators are an essentially component in many microwave systems and whilst the waveguide technologies they are implemented in have evolved their design today still employs procedures that are typically approximate and have no regular approach, which in many instances is through dependence on empirical equations or considered a trade secret that gives an edge to commercial suppliers of microwave and RF circulators. The result is expensive isolators where high performance is required as they are merely selected out or require manual tuning. Further, for broadband systems, designer's resort to dividing into sub-bands deploying multiple narrower band circulators. Accordingly, the inventors present a design methodology based on an accurate closed form solution allowing the selection of suitable ferrite specifications for the required operating bandwidth as well as calculating the ferrite disc impedance allowing the necessary matching network to be designed and the circulator design completed.