This paper presents a novel approach to design a miniaturized ultra-wideband (UWB) microstrip bandpass filter (BPF) with triple notched bands using a Multimode Resonator (MMR). The MMR is integrated with folded high-impedance interdigital coupled-line structures, enabling the filter to achieve a UWB characteristic while offering independent control over the introduced notched bands to prevent interference with other operating systems. Additionally, the adoption of folded interdigital coupled-line structures significantly reduces the overall dimensions of the filter. The LC equivalent circuits and transfer function of the proposed MMR are extracted to analyze the behavior of the filter. To validate the design, a fabricated prototype of the proposed filter with triple notched bands at 5.4, 8.1, and 10.1 GHz, featuring attenuations exceeding -22 dB, is presented. The measured results demonstrate that the designed filter provides a passband ranging from 4.2 to 12 GHz, along with a wide rejection bandwidth of up to 20 GHz.

This paper presents a compact topology for implementing multiband bandpass filters. The design uses interconnected Multimode Resonators (MMRs) and multi-level impedance structures to achieve a specific frequency response. This approach simplifies the design of quadruple bandpass filters for 4G and 5G applications. Since line widths cannot be adjusted post-construction, resonance positions require tuning. To evaluate the filter design process, a prototype incorporating MMRs was designed, manufactured, and analyzed, demonstrating close alignment between analytical predictions and experimental measurements, despite no simulation or optimization being performed during the design phase, except for result verification.Additionally, a design criterion is established to facilitate the rapid and reliable synthesis of multiband responses by varying only a few geometrical parameters of the MMRs. A simulation of this structure was conducted using CST software to confirm the proposed theory's accuracy. A reverse-biased varactor diode, which functions as a capacitor with specific admittance, is utilized to provide the necessary tuning capability. The paper also highlights the impact of the varactor diode's admittance on resonance location adjustments. To validate the design, the authors present a fabricated prototype of the proposed filter, which features quarter bands at 1.8, 2.1, 2.7, and 3.4 GHz, achieving an attenuations greater than -15 dB. The quarter band filter is primarily used in wireless telecommunications networks. Due to their specialized design, these filters can process multiple frequency bands simultaneously, enhancing communication quality and increasing network capacity in crowded and interference-prone environments.

Multimode contour integral method is one of methods in analysis and design of H-plane waveguide circuits. In this method, the effect of higher order modes excited by discontinuities in waveguide structure is considered. This causes to approve the accuracy of method in analysis or design of complex waveguide circuits.In this article, the Multimode contour integral method is used to determine the properties of dielectric Resonators (DRs) such as resonant frequency and dielectric constant. Thus, it is not necessary to optimize or tuning the designed DR filter. Also the accuracy goes high. The accuracy of method is validated by comparison of results with those reported in literatures.

This paper deals with the design consideration and performance results for low power low noise self-matched as well as an inductive-matched SiGe amplifier developed for the GSM/DCS/WCDMA multi-band cellular systems.The self-matched amplifier is based on the current reuse concept, and accommodates an active balun. On the other hand, the inductive-matched amplifier is a single-stage common emitter circuit with inductive on-chip matching. Both amplifiers have internal bias circuits. These amplifiers consume 5.0mA and 6.0mA at 3V to respectively provide a power gain of higher than 18dB and 13dB, a noise figure lower than 4dB, and an IIP3 higher than –16dBm and -4dBm, over 0.9-2.2GHz. With such a low current consumption, the developed amplifiers can be a candidate for low-power Multimode mobile terminal applications.

In this paper, the motion capability of wheeled mobile robot is increased by providing a new structure. Due to the special design, converting a two-wheeled robot to a four-wheeled robot is possible in the proposed multi-mode robot. This design has the ability to simultaneously and interchangeably provide locomotion and manipulation capability in motion on uneven terrain. Unlike most other mobile robot designs that have a separate manipulator arm module attached on top of the mobile platform, the central axis in this design can manipulate like a robotic arm. The robot midpoint as an end-effector is a passive joint. The part which could carry the guidance and visual equipments follows the height control, easily and without a new actuator. The basic requirement of stability and acceptable performance could be guaranteed through this simple, novel design. Finally, the simulation is used to study the robot’s enhanced mobility characteristics through animations of different trajectories for end-effector on uneven terrain.

The proposed structure is a closed-loop dual-band filtering antenna, in which the antenna and the Resonator are combined together. The filtering antenna consists of two triangular Resonators and a rectangular loop micro-strip antenna. The surface structure of a Rogers RO-4003 substrate with dielectric (εr) equal to 3.55 and insulation loss tangent (tgδ) equal to 0.0027 and a thickness of 32 mm is placed at frequencies of 3.4, 5.28 and 8 5.5 GHz, which indicates a return loss below 10 dB. This structure is suitable for Wi-Max and the fifth generation mobile communication network, and the filter antenna proposed for these applications has a suitable bandwidth and radiation pattern in its resonance frequencies. The design and analysis of the structure has been done using HFSS software. To confirm the correctness of the simulation results, a laboratory sample of the proposed filtering antenna is made and it shows the correctness of the measured values of the design and simulation

One of the most important phenomena to a_ect the motion behavior of Micro Resonators is their thermal dependency. This has recently received the attention of researchers widely. A thermal phenomenon has two main effects, the first is damping, due to internal friction, and the second is softening, due to Young's modulus-temperature relationship. In this research work, some theoretical and experimental reported results are used to make a proper model, including thermal phenomena. Two Lorentzian functions are used to describe the restoring and damping forces caused by thermal phenomena. In order to emphasize the thermal effects, a nonlinear model of the MEMS, considering capacitor nonlinearity and mid-plane stretching, has been used. The responses of the system are developed by employing a multiple time scale perturbation method on a non-dimensionalized form of the equations. Frequency response, resonance frequency and peak amplitude are examined by varying the dynamic parameters of the modeled system. Finally, Fuzzy Generalized Cell Mapping (FGCM) is introduced and applied to the Micro Resonator's dynamical system behavior. It is then concluded as to how the model uncertainties and different initial conditions can affect the working domain of the system and/or make it pull in instabilities. At the end, it can be seen that FGCM is a useful method for monitoring the working regions of Micro Resonators, while varying system parameters.

This paper is devoted to the design and construction of a novel technique for ferrite tuning of dielectric loaded, dual-mode cavity filters. This is dealt with in two specific areas:i) Improving the technique to realize a high -Q , low loss, dielectric-loaded, dual-mode cavity band-pass filter, using the hybrid 11 HEM 11d mode, ii) Developing techniques to obtain a wide range tuning mechanism, using ferrite materials. The designed dual-mode filters offer unloaded Qu of more than 10,000 with an insertion loss less than 1 dB. It is shown that ferrite tuning is possible either at below resonance or at the above resonance state, depending upon the strength of the applied DC magnetic field. Experimental results showed that due to its lower saturation magnetization YIG offers a wider tuning range compared with Nickel ferrite.

In this article, we designed a novel monolithic integrated optical transceiver based on the ring Resonator structure on semi-insulating In P substrate at 1.55 mm wavelength. To separate the incoming continuous (l2) and modulated (l1) optical waves from the network, an optical ring Resonator is utilized. The ring Resonator has the p-i-n layer stack that also detects the incoming modulated optical wave (l1). The continuous optical wave (l2) is guided to the ring-Resonator based modulator where it is modulated and finally directed toward a pair of ring Resonator to reflected back to the network. Channel spacing between l1 and l2 is 200 GHz (1.6 nm) at wavelength ranges of 1520 to 1570 nm. This transceiver can illustrate a 40 GHz bandwidth.