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The performance of the space mapping (SM) optimization algorithm depends both on approximation and generalization capabilities of the underlying surrogate model. Often, the surrogate is selected by trial and error which may lead to excessive computational overhead and poor quality of the optimization outcome. Here, we introduce an adaptively constrained parameter extraction process to automatically...
A technique for the automated generation of the layout of microstrip lines loaded with complementary split ring resonators (CSRRs) is proposed. This synthesis strategy presents a great practical interest, due to the reduction in terms of computational efforts, that is achieved without any significant lack of accuracy in the final solution. The application makes use of an aggressive space mapping (ASM)...
A wideband microstrip bandpass filter (BPF) using a ring resonator with dual stepped impedance stubs is presented. The two open-circuited stubs are placed on the symmetrical plane of the feed lines, the lengths and the characteristic impedances of which are calculated by the analysis of both resonance and transmission zero frequencies. Colinear feed lines, which are either direct connected lines or...
A W-band transformer-based injection-locked frequency tripler (T-ILFT) is designed and implemented in 65 nm standard CMOS technology using a 0.8 V supply voltage. The use of injection locking topology with on-chip transformer provides several advantages over conventional design. Occupying an chip area of 0.089 mm2 (including buffers), the T-ILFT achieves an input sensitivity of -15 dBm and a continuous...
The high-frequency scattering parameters and equivalent circuit for a gap on a microstrip line are found by analyzing the problem with an accurate semi-analytical method in the spectral domain, using an even/odd mode analysis. The analysis accounts for radiation into space as well as into surface waves, both of which become more pronounced at higher frequencies. The analysis allows for an examination...
A near-filed microwave imaging setup is investigated. The setup benefits from the high near-field directivity and good efficiency of a recently proposed ultra-wide band TEM horn antenna. The setup employs planar aperture scanning. It consists of two antennas aligned along each other's boresight and moving together to scan two parallel apertures. The imaged object lies between the two apertures. With...
This paper presents a new type of circulator that consists of three Lange couplers and two ferrite circulators for broadband, high isolation, transmit noise suppression and simultaneous transmit and receive (STAR). The operation principal of the circulator is based on quadrature phase cancellation and combination techniques. Preliminary results show that the isolation between the transmit and receive...
This paper describes the design approach and characteristics of an air-cooled ferrite half-wave plate operating in the vicinity of 1.3 GHz. frequency at a peak power level of 65 kW. and an average power level of 6,500 W. Measured data are presented for an engineering model unit with 0.4 dB. maximum insertion loss, capable of switching between any two states in approximately 500 microseconds.
We describe our recent achievements in integration of narrowband photonic RF receivers and discuss ultimate parameters of the devices. The best sensitivity and the spurious free dynamic range achieved in current built of our coherent receiver approaches −145 dBm/Hz and 90 dB/Hz^(⅔) respectively. We plan to improve these values to −164 dBm/Hz and 105 dB/Hz^(⅔) in the next generation, while keeping...
A superconducting MEMS varactor is reported. The device is fabricated using a standard Niobium superconductor foundry process. Utilizing this varactor a superconducting tunable notch resonator is implemented. The tunable resonator has a measured tunability of more than 20% from 3.22 GHz to 2.54 GHz with a biasing voltage from 0 V to 78 V. A 3-pole bandstop filter is also fabricated and tested. Simulation...
This paper presents a temperature-stable RF MEMS shunt capacitive switch which employs a circular beam geometry. The circular switch reduces the effect of stress changes versus ambient temperature and results in a average pull-in voltage slope of only −55.8 mV/°C from −5–125°C. This novel device is simulated and tested under continuous RF power at 10 GHz. Results show that the non-uniform temperature...
As the commercially available microwave monolithic integrated circuit (MMIC) amplifiers improve in output power and bandwidth a compact platform to combine a large number of these MMICs becomes very desirable. A reduced size version of a coaxial waveguide combiner structure using an antipodal finline antenna array is investigated. The reduced size coaxial waveguide combiner structure is used to demonstrate...
A highly integrated SiGe BiCMOS power amplifier for dual-band WLAN applications is presented. The PA has 2 and 3 stages of amplification for the ‘b/g’ and ‘a’ band, respectively, and integrates the input/output matching network, out-of-band rejection filter, power detector, and bias control. The die area is 1.7 × 1.6 mm2. The b/g amplifier achieves 28 dB gain with 19.5 dBm output power at 3% EVM and...
A microwave imaging technique is proposed for reconstruction of geometrical parameters (a spatial position and a radius) of a metal sphere emerging inside the sample of metal powder in the course of microwave sintering. The technique relies on a numerical inversion realized with an artificial neural network backed by data on S-parameters obtained from FDTD simulation and measurement. Numerical experiments...
A single chip, dual-functionality radio and FMCW radar transceiver, operating at 140 GHz is described. Doppler, loop-back and 4Gb/s NLOS radio link demos, over the air and distances exceeding one meter, are demonstrated. The second part of the paper presents novel, sub−1.8 V circuit topologies intended for a low power, high resolution 120 GHz radar transceiver with self-calibration capabilities. The...
In typical simulations of heating processes in household microwave ovens it is assumed that the frequency of the magnetron stays constant at its nominal value. In reality, due to manufacturing variations, load parameters, and the magnetron temperature, frequency differences or jumps of 50 MHz may occur. This publication shows coupled electromagnetic and thermal simulations of microwave heating phenomena...
This paper presents a new method of detecting the angular velocity of moving objects using passive interferometry. The new technique is presented using a millimeter-wave correlation interferometer to measure the angular velocity of a moving target directly, without the need for multiple looks. As the object passes through the interferometer beam pattern the frequency of the signal output is dependent...
In this paper, the transmission properties of three 1-row periodic rod arrays, namely perfect conductor array, copper array with surface conductivity and single wall carbon nanotube (SWCNT) array with quantum conductivity, are investigated. MoM with special algorithms of Toeplitz matrices is employed. It is found that, due to the quantum effects, SWCNT array can transmit energy in a lower frequency...
The paper presents very recent results from a novel continuous, pilot scale microwave treatment process for the continuous treatment of oil contaminated drill cuttings. The requirements of a commercial scale system are outlined, and the necessary scale-up challenges are highlighted. The process has been developed for the remediation of contaminated drill cuttings at source, i.e. on offshore oil platforms...
A planar Epsilon-Near-Zero structure implemented on substrate integrated waveguide technology is used for the characterization of material dielectric permittivity. The proposed structure has very high sensitivity which yields more accurate results when compared to other techniques, such as perturbation of conventional cavities. This prototype presents a low profile, low cost, ease of fabrication and...
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