A new waveguide made of changing a wide wall of a rectangular waveguide to a uniform curved wall is called conformal waveguide . a kind of expression of approximate solution for domain mode of the new waveguide , including symmetric , unsymmetric arc , parabolic arch , hyperbolic arch , elliptic arch , etc . , is constructed by using boundary condition of mental waveguide , variational method and boundary element method . by using the equivalence principle , an approximate calculating formula for equivalent resonant conductance of a narrow longitudinal halfwavelength slot cut in the curved wall of the unsymmetric arcrectangular waveguide is derived , and the result is shown . although this solution is approximate , it can solve the problem in designing the slotted antenna of such conformal waveguide 把矩形波导一个宽面外突成均匀曲面构成的新波导统称为共形波导.利用金属波导边界条件、变分法、边界元素法构造这种新波导中主模场的一种近似解表达式，包括曲面横截线为对称、非对称圆弧，抛物线弧，双曲线弧，椭圆弧等.然后根据等效原理，推导非对称圆弧矩形波导曲面上窄的纵向半波长缝隙的等效谐振电导的近似计算公式，给出计算曲线.这种解虽然是近似的，但却能解决这类共形波导缝隙天线的工程设计
Abstract : a new waveguide which can change the wide wall of a rectangular waveguide into a symmetric arc wall is named as a cam - rectangular waveguide . comparing to sectoral waveguide , the new waveguide has the same voltage characteristics and is easier to be produced and fixed . an approximate formula of the dominant mode fields and the normalized conductance of a longitudinal resonant slot cut in the curved wall of a cam - rectangular waveguide are given . a resonant slot linear array in c & x band is designed , in which the slot voltage distribution is equiphase and the input is matched . the input voltage stationary ware ratio and the h - plane pattern of the antenna are measured . the experimental results show the conformance with theoretical results 文摘:把常用的矩形波导一个宽面改成圆弧形构成的波导称为圆突-矩形波导.这种波导与扇面波导相比：电性能相当；波导管结构更加简单，容易加工，便于安装.文中给出圆突-矩形波导中主模场，圆曲面上纵向槽归一化谐振电导近似公式.设计了c和x波段波导曲面纵向谐振缝隙线阵，缝隙电压相位为同相分布，输入端匹配.实际测量了天线输入端电压驻波比和h面方向图，理论与实验相吻合
The physical meaning for each of the term in the coupling coefficient is stated . in particular , we advance firstly ( as far as our knowledge ) , that the birefringence can cause additional coupling for the directional coupler . then , taking the ti - diffused linbo3 directional coupler and the ti - diffused linbo3 with gradient refractive index for examples , we make the numerical simulation for the coupling coefficient or the propagation constant , which prove that the birefringence has played a crucial effect on the propagation constant and the coupling between the modes that we can not neglect 第二，我们推导出了弱导近似下各向异性光波导在任意微扰下的非正交耦合模理论，得到了物理意义鲜明的耦合波方程和耦合系数表达式，指明了耦合系数所包含的四项各自的物理意义及在不同条件下的取舍，首次提出在方向耦合器中双折射将引起附加的耦合，并以钛扩散铌酸锂方向耦合器和折射率渐变分布的钛扩散铌酸锂矩形波导为例对耦合系数进行了数值模拟，充分体现了双折射项对传播常数的影响。
The basic concept of siw is that it use the top and bottom layers of metal together with two row of vias is very small compared with wavelength , the dissipation loss of radiation is very small . it acts like a rectangular waveguide filled with some dielectrics , so components which can be composed by rectangular waveguide can also composed by siw such as antenna , filter , power divider , coupler , resonator 基片集成波导的基本概念是利用基片的上下金属板和两排间隔一定距离的金属孔构成波导的金属壁,由于每排金属孔孔间距远小于波长,因此由缝隙泄漏的能量很小,这相当于内部填充了介质的矩形波导,所以能够用矩形普通波导实现的结构也都可以用基片集成波导来实现,比如功分器、滤波器、天线、耦合器、振荡器等。
