In this letter, we present the new type parallel-coupled band-pass filter (BPF) which uses the dielectric guide in coupled sections with finite metallization thickness. A mode-matching method has been used to analyze this new structure and the simulation results are shown and validated through comparison with other available data. The results in this letter show that the dielectric guide of coupled lines with finite metal strips can be newly added to the design parameters of the parallel-coupled BPF structure and other microwave applications.

In this letter, a new CCM material, adding Ni powder to a conventional CCM, for X-band applications is designed and analyzed to improve the SE. To obtain the SE of the fabricated CCM accurately, material constants of the CCM of the permittivity and permeability were extracted using transmission/reflection measurements. Using the material constants derived from the measurement, the SE was calculated and the results were verified using a commercial full-wave three-dimensional electromagnetic wave simulator. The SE of the proposed the CCM was improved by approximately 4 dB in the X band compared to that of a conventional CCM. The CCM proposed in this paper can be applied as a shielding material as well as for housing of various communication systems and electrical instruments.

We proposed and analyzed a fiber-reinforced ceramic (FRC) composite for a protection layer on top of an antenna mounted on the outer surface of aircraft. The manufactured FRC is a single-layered flat construct. To analyze the performance of the FRC, we extracted the material constant using the transmission/reflection (T/R) method. We described the relation between the pressure and strength of the FRC radome with respect to mechanical properties and analyzed the insertion loss with respect to electrical properties. We evaluated the characteristics of the FRC radome in conjunction with the horn antenna and showed that the analytic results for the FRC radome agree with the experiment results.