A metallic coupler is proposed to interface a silicon on insulator (SOI) WAVEGUIDE with a narrow hybrid plasmonic WAVEGUIDE (200× 200 nm). The device operation is investigated and optimized to attain the best tradeoff between the mode confinement and the propagation loss. Calculations reveal that a high confinement and low loss of the energy is achieved from a silicon slab WAVEGUIDE into the dielectric slot of area 200×200 nm2 and a coupling efficiency of 70% (0.8 dB) at the 1.55 mm telecommunication wavelength can be achieved.

In this paper, a novel WAVEGUIDE array antenna composed of non-inclined slots in the narrow wall of the WAVEGUIDE, which are excited with rectangular Iris is introduced. This new method in addition to improving impedance and radiation characteristics has an easy production process. Also, because of using non-inclined slots, the antenna has very low cross polarization level. In this paper, in the first step, suitable radiating elements for designing a linear slot array antenna were considered, and then a linear array suitable surveillance radar with 136 elements with Taylor distribution is designed and simulated with HFSS at the frequency of (2.7 - 3.1) GHz. Finally, the antenna has been fabricated and tested. The results of the test and simulation are in good agreement.

This paper deals with the design and simulation of a WAVEGUIDE rotary joint using gap WAVEGUIDE technology for millimeter wave applications. It contains two TE10 to TM01 mode converters and rotary junction between two circular WAVEGUIDEs. The excited mode along the circular WAVEGUIDE for rotational symmetry purpose is TM01. The most important advantage of using gap WAVEGUIDE technology is its ability to decrease complexity and cost of fabrication especially in millimeter wave frequencies because there is no requirement of contact between the different parts of the rotary joint structure. The Simulation results show that at different rotation angles the insertion and return loss are better than 0. 4 dB and 10 dB over 58. 5 GHz to 61 GH frequency band.

Multipactor breakdown analysis is presented in cylindrical dielectric resonator WAVEGUIDE filter under its dual-mode behavior. The method of effective electron algorithm with combination of Monte-Carlo method is used to perform the simulation and predict multipactor breakdown thresholds. The breakdown thresholds of the proposed structure are presented for different values of frequency-gap product. The results indicate that increasing the radius of filter increases the RF breakdown threshold. The results are compared with the classic parallel plate WAVEGUIDEs.

An analytical and numerical study is made on the dispersion properties of a cylindrical WAVEGUIDE filled with plasma. An electron beam and static external magnetic field are considered as the mechanisms for controlling the field attenuation and possible stability of the WAVEGUIDE.The effects of plasma warmness and inhomogeneity are also considered. Dispersion relations in w describing different physical situations that govern the mode propagation in the WAVEGUIDE are obtained. The plasma dielectric tensors and the dispersion relations which describe E and H waves and, hence, the damping rate of these waves are calculated and studied. The necessary conditions for the field stability in the WAVEGUIDE and amplification coefficients for these waves are also obtained. H-wave modes are always attenuated by collisional effect. The growth of the excited E wave is calculated in the resonance case, and the stability condition for the E wave is obtained. E waves are found to be more stable in warm plasma compared to cold plasma. The results obtained here are of great interest and may be used to analyze how the plasma affects the electromagnetic properties of the cavity of the 1-2 MW 140-170 GHz continuous-wave gyrotron (for W7-X stellarator and ITER), for MW gyrotron development for fusion plasma applications, and for second harmonic generation in a plasma-filled parallel plane WAVEGUIDE.

Using a fullwave analysis, the integral equation for unknown electric field distribution on the slot apertures of GCPW is derived. Then it is numerically solved in the space domain using the method of moments. Using derived electric field distribution and ideal transmission line theory, the discontinuity parameters of short-end and open-end GCPW are computed and compared with CPW. In addition, a comparison between the CPW and GCPW effective dielectric constant is presented.