Quasioptical transformer which transforms the waves in a waveguide having a circular cross section into a highly directional wave beam
Quasioptical transformer which transforms the waves in a waveguide having a circular cross section into a highly directional wave beam
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DOI：
10.1007/bf01037072
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发表时间：
1974
影响因子：
0.8
通讯作者：
S. Vlasov;I. M. Orlova
中科院分区：
文献类型：
--
作者：
S. Vlasov;I. M. Orlova
(2)B，n= a 1 k：a”'d，n = 1 k 2 a 2 sin 2 0，而f！和f2是坐标z的函数，其描述了分别以角度θ = arccos（h/k）向z轴和从z轴传播的波中的m次谐波在半径为a的圆柱体上的场分布; h是波导中的波的传播常数。在（2）中，假定f1只在-11 <z ′ + aeotan 0 <11时才为非零，而f1和f2在波长量级的维度上略有变化。如果场对q）的依赖性可以用具有m<< ka sin 0的谐波的叠加以足够精确的程度来描述，使得对于它们中的每一个，bm和dm对r的依赖性都可以忽略，那么对于从波导表面到抛物面镜附近的表面上的场的传播，基本上不产生失真。对于类型（1）的场的传播，对于~ mp~ 10，畸变可以在~ 5-10%内忽略，因为在这种情况下，前五个谐波（m= 0，~：1，·）已经包含超过95%的束能量。
(2) b, n= a 1 k: a"'d,,= 1 k 2a 2sin20, while f! and f2 are functions of the coordinate z which describes the field distribution of the m-th harmonic on a cylinder of radius a in waves propagating toward the z axis and from the z axis, respectively, at an angle 0= arccos (h/k); h is the propagation constant of the wave in the waveguide. In (2) it is assumed that fi is nonvanishing only for-ll< z'+ aeotan0< ll, while fl and f2 vary slightly over dimensions of the order of a wavelength.If the dependence of the fields on q) can be described with a sufficient degree of accuracy by a superposition of harmonics having m<< ka sin0, so that for each of them the dependence of bm and dm on r may be neglected, then for propagation of the field from the waveguide surface onto the surface near the parabolic mirror no substantial distortions develop. For propagation of fields of the type (1) distortions may be neglected within~ 5-10% for~ mp~ 10, since in this ease the first five harmonics (m= 0,~: 1,• already contain more than 95% of the beam energy.