Anatoliy Batmanov

Design of H-shaped low actuation-voltage RF-MEMS switches

Low actuation-voltage and high reliable microelectromechanical systems (MEMS) shunt capacitive and shunt resistive switches are in this paper proposed. Electrostatic-mechanical coupling using finite element method (FEM) and full-wave electromagnetic (EM) analyses have been performed. The mechanical design of a low spring-constant switch structure has been optimized by calculating the dependence of the actuation voltage on the membrane shape, material properties and geometrical sizes. The proposed switches, based on Al metallization membrane, show a pull-in voltage around 7 and 13 Volts with 0 and 20 MPa residual stresses, respectively. The simulated insertion losses are less than 0.25 dB up to 40GHz with a return loss of about 20 dB in the ON- state. The isolations in the OFF-state for the capacitive-switch are greater than 20 and 35 dB at 12 and 40 GHz, respectively. The shunt resistive switch theoretically works from zero frequency with isolation greater than 25 dB up to 40 GHz. The fabrication of those switches is compatible with standard CMOS technology and they are in process.

Control of Bandwidth and Resonant Frequency of a New Coplanar Bandpass Filter

This paper presents the design of a new compact end-coupled bandpass filter (BPF). This structure is based on coplanar waveguide (CPW) lines and lambda/4 resonators. Both the bandwidth and the matching can be easily controlled by changing the dimensions of the components of the filter. The structure has been implemented for the bands 2.5-7.6 GHz and 1.7-5.2 GHz. The electromagnetic and equivalent-circuit simulations are in good agreement with the measurements.

A Miniature 3.1 GHz Microstrip Bandpass Filter with Suppression of Spurious Harmonics Using Multilayer Technique and Defected Ground Structure Open-Loop Ring

In this chapter a cascaded bandpass filter composed of three open-loop λ/2 resonators is proposed. The three elements are electromagnetically coupled. They are placed on the top of a multiplayer structure. Electromagnetic simulation of the cascaded bandpass filter shows good results in both passband and in stopbands. The filter provides two 3-dB attenuation pole frequencies f 1 at 2.95 GHz, f 2 at 3.25 GHz, and a center frequency f 0 at 3.1 GHz. In order to develop and to miniaturize this planar three-pole microstrip bandpass filter, two ideas are developed and implemented that are based on DGS technique and the coupling matrix method. Using DGS resonators on the ground structure, a compact filter with improved response has been realized. The proposed filter has been fabricated on a substrate with dimensions of (0.57λ g × 0.28λ g ). The simulated and measured results show good agreement and validate the proposed approach.

New compact MEMS-switch controlled tunable DGS coplanar bandpass filter

A new compact microwave defected-ground-structure (DGS) coplanar bandpass filter (BPF), which operates from 18 to 26 GHz (k-band), has been designed and simulated. The proposed structure can be redesigned for an other frequency range by changing the geometrical parameters of the CPW lines. The bandpass filter occupies an area of 2.8times1.3 mm2 and consists of two cascaded parallel-resonance circuits coupled with a series capacitor, forming a series resonator. The use of MEMS series-resistive contact switches between the additional external stub and metallic ground planes permits systematic control of the bandwidth and thus the control of two transmission zeroes in the frequency domain. Therefore, the designed bandpass filter has a wide upper bandstop and an improved symmetry of the bandpass response. The equivalent circuit extraction method has also been derived. Simulations based on the proposed circuit model are in good agreement with the electromagnetic (EM) simulation. The BPF has been designed in CPW environment on high-resistivity silicon substrate and therefore is suitable for standard MIS and MMIS.

New Low-Pass Filter Design Using Compensated Microstrip Capacitor and Coupled Meander Defected Ground Structure (DGS)

In this paper, we propose a new compact DGS lowpass filter with broad stop-band and low insertion loss in the pass-band. The philosophy of the structure behind this new microstrip low-pass filter is simple as it is composed of a pair of meander DGS-slots and open-stubs. The direct electromagnetic coupling and slow-wave effect have been employed to design the proposed filter using DGS and multilayer method. The optimized low-pass filter has shown higher compactness, broad stop-band and sharp transition characteristics. The design equations are derived using a lumped-element equivalent circuit model of a parallel L-C resonator. In order to validate the feasibility of the proposed design, a low-pass filter with 0.1-dB ripple is designed, fabricated, and measured. The experimental results have shown a good agreement with the simulation and analytical results.

A new compact tunable bandpass filter using defected ground structure with active devices

A new tunable bandpass filter using Hairpin-DGS and varactor as active device has been presented. Both, the simulated and the measured results have demonstrate that the proposed passive one pole DGS BPF may be easily transformed to a tunable BPF by adding a simple variable capacitor on the DGS-element. The measured results have shown a good one pole bandpass response with a high quality factor and with a good sharpness in transition range. Additional the proposed BPF is very compact in comparison with the conventional tunable filters. The introduced BPF has been designed to meet the requirements of modern wireless communication systems.

A simple method to control the reject band of microstrip low pass filter using a new multi-ring defected ground structures (DGS)

A new double close-loop DGS lowpass filter cell is proposed. The cutoff and resonance frequencies bounding the stopband were shown to be easily controllable by the length of microstrip capacitor. Using the obtained characterization curves, a new multi-ring DGS Lowpass filter with very wide reject band and superior characteristics could be realized. Moreover, this filter can also provide a 20dB wide upper stopband up to 4 times the cutoff frequency. The measurement results have shown good agreement with the simulated results. Finally, this newly proposed compact and high-performance LPF can be used in a wide range of applications of microwave components and antenna arrays.

A new method to improve the rejectband of a 5.6 GHz bandstop filter using λ/2 open-loop ring microstrip resonators

In this paper, a new compact bandstop microstrip filter using two cascaded ring resonators has been designed, fabricated and measured. The lambda/2 open-loop-ring resonators are used to obtain the sharp cut-off frequency response as well as a good filter performance in both the pass-band and the stop-band. The equivalent circuit model has been developed to characterize the proposed bandstop structure. The both equivalent circuit and the electromagnetic simulations are in a good agreement with the measured results.

New Coplanar Low-Pass Defected Ground Structure (DGS) Filter

This chapter presents the design of a new compact low-pass defected ground structure filter (DGS LPF). The proposed structure is based on coplanar waveguide (CPW) lines and λ/4 resonators. The filter provides three transmission zeros within the stop-band and offers bandwidth of 8.3 GHz, namely from 3.1 to 11.4 GHz. The stop-band rejection is more than −20 dB. Filter dimension is as low as 4 × 23.4 mm2. An equivalent circuit model is used to investigate the filter characteristics. The proposed low-pass filter has been fabricated and its characteristics measured. Good agreement between electromagnetic simulation, equivalent circuit simulation, and measurements has been obtained.

Miniaturized Coplanar Bandpass/Bandstop Filter Using Meander Serpentine Shape Shunt/Open-Stubs

This paper presents a design of a new compact bandpass filter in coplanar waveguide implementation composed of meander serpentine shape shunt-stubs. The meander serpentine shape shunt-stubs allow to increase the inductive loading and thus to reduce the size of the filter. The proposed filter has two transmission zeros on both sides of the passband. The equivalent circuit model has been proposed to describe the filter behavior. The measured center frequency, bandwidth and insertion loss are 5 GHz, 50% and 0.5 dB, respectively. The geometrical size of the proposed filter is 20times13.2 mm2. Good agreements between both measured and simulated results have been observed. Finally, proposed bandpass filter has been transformed to bandstop filter and has been described.