In this paper, a novel heuristic diffraction coefficient in the frequency-domain (FD) for non-perfectly conducting wedges and buildings is proposed. The six-terms diffraction coefficient which is an extension of the four-terms UTD coefficient is proposed to include the effect of transmitted ray for a lossy dielectric wedge with arbitrary low wedge angle, thus, attaining the continuity of the total field all around the structure. This new six-terms UTD diffraction coefficient is verified with the earlier available finite-difference time-domain (FDTD) result. Further, the time-domain (TD) solution based on the classical frequency domain result is proposed for UWB applications in indoor environments. Finally, a case of double diffraction for two consecutive buildings scenario is presented based on slope diffraction and their corresponding TD solution is also presented. The different input pulses and building materials are considered to test the overall behavior of the TD model. All the TD results are verified with inverse fast Fourier transform (IFFT) of the FD results in both the soft and hard polarization and the results are found to be in very good agreement. The channel impulse response is also presented to determine the distortion on the input pulse. The computational efficiency of the proposed TD solutions is demonstrated by comparing them with IFFT-FD solutions.

在本文中，提出了一种新的频域（FD）启发式衍射系数，用于非完美导电的楔形和建筑物。提出六项衍射系数是四项UTD系数的扩展，包括透射射线对任意低楔角的有损介质楔的影响，从而实现结构周围总场的连续性. 这个新的六项 UTD 衍射系数已通过早期可用的有限差分时域 (FDTD) 结果进行验证。此外，针对室内环境中的 UWB 应用，提出了基于经典频域结果的时域 (TD) 解决方案。最后，给出了基于斜率衍射的两个连续建筑物双衍射的情况，并给出了它们相应的 TD 解决方案。考虑不同的输入脉冲和建筑材料来测试 TD 模型的整体行为。所有 TD 结果都通过 FD 结果在软极化和硬极化中的快速傅里叶逆变换 (IFFT) 进行了验证，并且发现结果非常一致。还提供信道脉冲响应以确定输入脉冲的失真。通过将它们与 IFFT-FD 解决方案进行比较，证明了所提出的 TD 解决方案的计算效率。所有 TD 结果都通过 FD 结果在软极化和硬极化中的快速傅里叶逆变换 (IFFT) 进行了验证，并且发现结果非常一致。还提供信道脉冲响应以确定输入脉冲的失真。通过将它们与 IFFT-FD 解决方案进行比较，证明了所提出的 TD 解决方案的计算效率。所有 TD 结果都通过 FD 结果在软极化和硬极化中的快速傅里叶逆变换 (IFFT) 进行了验证，并且发现结果非常一致。还提供信道脉冲响应以确定输入脉冲的失真。通过将它们与 IFFT-FD 解决方案进行比较，证明了所提出的 TD 解决方案的计算效率。