波导宽边纵缝的导纳计算公式

得出了矩形波导这这纵缝的等效导纳计算公式,计算结果表明,该公式与实验结果相吻合。     

波导宽边斜缝耦合线阵的设计

采用等效串联电路方法,对端馈和中馈两种情况下的波导宽边斜缝耦合线阵进行分析,简述了设计原理,并用Ansoft HFSS软件对这两种情况进行建模仿真,证明了这种设计方法可以在工程设计中得到应用.     

波导宽边纵向缝隙阵的分析

采用等效电路与矩量法相结合的方法，建立波导宽边纵向缝隙数学模型。它既克服了一般效电路分析方法无法进行频率特性分析的缺点，又克服了利用一般矩量法求解积分方程仅适应于几个缝的小阵的缺点。这种分析方法缝隙的辐射导纳是由矩量法直接求解的，与站平时征于谐振状态无关，因此，可以分析天线性能随频率的变化情况。介绍的分析方法包括一互耦，考虑了波导的壁厚、利用该分析方法，对宽边纵向缝隙阵端馈与中心馈电的两种情况进行     

矩形波导宽边辐射纵缝的MPSTD算法分析

 针对MPSTD算法在波导宽边辐射纵缝问题中的应用,本文首先提出了基于Maxwell方程特征变量的总场-散射场分离方法,推导了散射场子域与总场子域分界面上的场值更新关系;其次,采用场区划分的思想给出一种激励源的设置方法,有效地将入射场子域、散射场子域及总场子域联系起来,方便了入射场的加入与散射场的提取.以此为基础,对波导宽边辐射纵缝的谐振长度和阻抗特性进行了分析.仿真结果表明,将MPSTD算法应用于波导纵缝问题的分析,可实现对该问题的精确建模,具有较高的计算精度和效率.     

波导宽边同缝隙阵的分析

采用等效电路与矩量法相结合的方法，建立波导宽边纵向缝隙阵分析的数学模型。它既克服了一般等效电路分析方法无法进行频率特性分析的缺点，又 克服了利用一般矩量法求解积分方程仅适应于分析几个缝的小阵的缺点。     

波导窄边斜缝线阵的分析

本文给出了分析波导窄边互耦斜缝列的矩量法，对比了相同五单元模型（单缝元及紧耦合双缝元）Ｓ矩阵频应的实测值与计算值，对比了６８单缝元线阵的方向性，结果表明本法较为精确，可用以分析长列阵的特性，为优了设计打下基础。     

共面波导馈电的宽带天线设计

介绍了共面波导天线的性能、设计原理,分析了各个参数对天线性能的影响,通过优化半椭圆辐射贴片的长短轴半径,设计了一种结构简单的共面波导馈电的小型超宽带天线,覆盖频段为2.9～10.8 GHz.在此天线的基础上,采用在天线辐射贴片底端依次刻蚀三组矩形凹口的措施,使得天线的带宽得到进一步的展宽,覆盖了3～31 GHz频段,阻...     

波导裂缝天线阵的设计与分析

一、引言波导裂缝天线阵已在许多要求窄波束或赋形波束方向图的微波通信和雷达中获得了广泛的应用,特别适用于要求重量轻和小的扫描空域的机载设备。这种天线可采用窄边开缝或宽边开缝的谐振或非谐振阵。原图1(略)中的天线是个典型的例子,其中辐射缝为偏离波导中心的宽壁裂缝。它还利用宽壁斜缝从低功率电平波导中把射频能量耦合至宽壁开缝的馈电波导。典型的波导裂缝阵在设计过程中,首先是按要求决定阵的尺寸、开槽型式、馈电方     

有限元\\边界元混合算法分析波导裂缝阵列天线

研究了一种分析波导裂缝阵列天线的方法。将有限元-边界元混合算法（FE-BI）应用于波导裂缝阵列天线的计算中,建立理论分析模型,计算波导裂缝上的等效磁流,进而求解整个天线阵列的远场辐射特性。为了检验这种方法的正确性,将所得的数值计算结果与测试值进行了比较,结果表明：FE-BI法可以作为计算波导裂缝阵列天线的一种有效的方法。     

Development of a compact transverse slot array antenna using corrugation in groove gap waveguide technology

We present the proof of concept of a compact slot array antenna with proper side lobe level in groove gap waveguide (GGW) technology. Four transverse slots are etched at the GGW broad wall along with the nulls of standing TE₁₀ wave existing inside the shorted GGW. To decrease the sidelobes and antenna size, corrugations are applied through the wave path inside the GGW. Proper use of corrugations can reduce the wavelength inside the GGW leading to reduction of the distance between adjacent transverse slots, which can help to suppress the grating lobe problem and consequently enhance the radiation efficiency, which is a challenge in transvers slot array antennas. The designed antenna is optimized to achieve maximum gain, lowest grating lobe level, and return loss at 15 GHz using HFSS simulator. The achieved gain is about 13 dBi, and the SLL is better than 15 dB. To confirm the simulation results, the designed antenna was fabricated and tested. Both simulation and measurement results confirm that the grating lobes are well suppressed at the antenna operating frequency.     

星载Ku波段波导缝隙天线的缝隙特性分析

在星载Ku波段谐振式波导缝隙阵列天线设计中,由于结构空间的限制,采用半高非标准波导。考虑到半高波导中更容易产生高次模影响的特点,以及设计成本和效率问题,将基于有限元法的高频电磁仿真软件Ansoft HFSS与Fortran编程相结合应用于该类天线的设计。采用HFSS研究并描述了宽边纵向辐射缝隙和中心倾斜耦合缝隙的特性,结合Elliott提出的经典平面缝隙阵设计理论,用Fortran编程设计了阵元数为80(8×10)的波导缝隙阵列天线实验件,并用HFSS仿真优化了天线阵整体的性能。对实物天线进行了近场测试,结果表明:天线的E面和H面副瓣电平分别是-29 dB和-27.5 dB,1.3以下驻波带宽为340 MHz,与仿真结果基本吻合。良好的测试结果验证了用HFSS获取缝隙特性曲线的正确性及设计方法的有效性,为后期大型阵列设计提供了一种有效的方法。     

具备阻抗和低副瓣宽带特性的脊波导缝隙阵列天线设计

设计了一种16×8脊波导缝隙阵列天线,线阵阵面分成两个子阵,馈电采用同轴馈电与耦合缝隙馈电结合的两级馈电方式,辐射缝隙分布为泰勒分布。天线设计采用近场诊断方法和阻抗过载技术进行优化。天线实物加工测试结果表明,天线在X频段驻波带宽(VSWR≤1.5)为7.3%,最低副瓣达到-25.8 dB,副瓣电平带宽(SLL≤-19 dB)为6.2%。与已有文献相比,该天线同时具备阻抗宽带特性和低副瓣宽带特性,工作频带内具有增益均大于16 dBi的高增益特性。     

波导H-T纵向双缝耦合器的研究

提出一种波导H－T双缝耦合器,并用矩量法对其进行了分析计算、结果表明这种耦合器反射系数小、耦合度频响特性好,优于单缝耦合器。     

Form of field in small-offset longitudinal slot in broad wall of rectangular waveguide

A surface-patch moment method approach is used to examine the electric field distribution in longitudinal slots that have small offsets from the host rectangular waveguide centreline. It is shown that the phase of the transverse electric field in the slot may display a large variation across the slot narrow dimension in such instances.<>     

Transverse slot antenna array in the broad wall of a rectangular waveguide partially filled with a dielectric slab

A compact and wide-band transverse slot antenna array in the broad wall of a rectangular waveguide partially filled with an H-plane -dielectric slab is presented in this paper. By partially filling an H-plane dielectric slab in the waveguide, the inter-element spacing between slots is reduced to be about 0.8 free-space wavelengths to avoid grating lobes. In addition, the partially filled material provides extra flexibility to adjust the slot impedance as desired within a relatively wide frequency range. A new feeding network is designed for this antenna array, which can prevent the shift in the pointing angle of the array's main radiation beam with the change of frequency. Experimental data for a 2/spl times/4 antenna array operating at X-band show that stable radiation pattern over a wide frequency range can be obtained. The measured gain is 16.9 dB at 10 GHz and the fluctuation is less than 2 dB over a frequency band of 1.5 GHz. The slot array's 10-dB return loss bandwidth is 13% and the cross-polarization level is better than -25 dB.     

Compound radiating slots in a broad wall of a rectangular waveguide

An analysis is presented of the characteristics of a broad wall radiating slot, offset from the center line and tilted with respect to the longitudinal axis of a rectangular waveguide. Pertinent integral equations are developed, taking into account finite wall thickness, and are solved for the slot aperture E-field using the method of moments. Compound slot characteristics are then deduced, including resonant length and dominant mode scattering. Numerical results for the scattering from resonant slots are presented over a range of offsets, tilt angles, frequencies and waveguide dimensions. For resonant compound slots, offset and tilt are shown to control the aperture electric-field amplitude with a phase variability of 360°. The results have significant applications in the design of compound slot arrays     

矩形波导窄边缝隙分析方法述评

对矩形波导窄边缝隙的各种分析方法进行了综述,并指出了它们存在的问题。从中可以看到这一问题的理论分析方法的进步和尚需解决的问题。     

矩形波导宽边偏置交叉缝研究

提出了一种新的矩形波导缝隙阵列的单元形式－宽边偏置交叉缝，并采用全域正弦基Ｇａｌｅｒｋｉｎ法对其散射特性和谐振特性进行了理论分析。数值结果表明，这种缝隙单元的散射作用与宽边偏置纵缝相似，二者均可以用等效传输线上的一个并联导纳来表示，但交叉缝的谐振长度比纵缝显著缩短，因而交叉缝阵列中单元间的互耦相对较弱，频带相对较宽。理论计算结果与实验测量数据的良好吻合验证了上述分析方法的准确性。