The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper presents the design of a novel 0.325THz-0.5THz wide-band tripler, which is based on GaAs planar schottky diodes and TMIC. The design uses Ansoft HFSS 3-D EM simulation to model the diode geometry and Agilent ADS non-linear harmonic balance circuit simulation to analyze and optimize the performance of the circuit. According to the measured results, the output power of the tripler in the...
A high performance millimeter wave harmonic mixer is presented in this paper. The principle, design, simulation, manufacture, and test results are given. The millimeter wave harmonic mixer is designed to operate at RF frequency band of 75GHz–110GHz. Mixer conversion loss is better than −46dB, and frequency response index is better than ±3dB in work frequency band. The harmonic mixer has been successfully...
A novel 170GHz–260GHz sub-harmonic mixer (SHM) is designed and analyzed in this paper. The simulation results and measurement results is compared. The mixer is based on a low parasitic anti-parallel pair of GaAs planar Schottky diodes. The circuits are integrated With the high pass filter and IF filter, which are fabricated on a suspended quartz-based substrate. The best conversion loss of mixer is...
A high sensitivity w-band radiometer front-end is designed in this paper for security screening and material composition recognition. The design of waveguide-micro-strip line transition structure, impedance matching network of MMIC chips and micro-strip line detector is accomplished by high frequency electromagnetic simulation. The voltage sensitivity of the detector in W-band radiometer front-end...
An one dimensional ultra-wideband sparse MIMO antenna array has been designed for near field RCS imaging system in this paper. The proposed one dimensional MIMO antenna array is composed of 14 transmitting antennas and 14 receiving antenna. The antenna element of the proposed MIMO array is a 1–8GHz taper slotted low profile Vivaldi antenna with the gain from 4.52 to 10.04 dB. A prototype of the MIMO...
In this paper we present a new ultra-wideband 20-way coaxial power combiner. In this new structure, there is a radially extended coaxial cavity and 20 coaxial coupling probes. It can not only be used as power combiner but also power divider. There are several critical parameters we'll discuss here that ultimately determine the performance of the new power combiner. The new structure can efficiently...
A low profile tapered slot antipodal Vivaldi antenna has been designed for array-based UWB target RCS imaging system. The antenna design with dimensions of 100mm×40mm achieves satisfactory impedance matching and radiation across the frequency band from 2.8 to 40 GHz with more than 173% fractional bandwidth. Both simulation and measurement results show that good radiation characteristics have been...
A monopole Electronic Steering Passive Array Radiator (ESPAR) antenna for continuous wave RCS measurement is proposed in this paper. A novel robust sidelobe Reduction (SLR) adaptive algorithm is used to optimize the reactive load for each passive element. Simulated results show that the monopole ESPAR antenna has good capacity of pattern steering in azimuth.
In this paper the influence of parasitic elements on characteristics and design of the electronically steerable passive array radiator (ESPAR) antenna is analyzed and discussed. Simulated results of three types of simplified ESPAR antennas are compared. Through the comparison, it is found that if the parasitic element is open to the ground, it has no effect to the radiation characteristics of ESPAR...
This paper presents a new spatial power combiner based on millimeter wave broadband multi-way ridged waveguides. The device is composed of a multi-step impedance transformer and 32-way ridged waveguides. Since the ridged waveguides provide a consistent impedance transformation and a broad band working frequency, a millimeter wave solid-state power amplifier based on the combiner demonstrates an output...
From 18GHz∼26.5GHz, A new microwave spatial power combiner is designed. The device is composed of a multi-step impedance transformer and twenty waveguides. Since the waveguides provide a consistent impedance transformation and a broad band working frequency, a microwave solid-state power amplifier based on the combiner demonstrates an output power of more than 10 W at 26.5 GHz and greater than 15...
The design of a taper slotted low profile Vivaldi antenna for array-based ultra-wideband near field imaging is presented in this paper. The proposed antenna with dimensions of 140∗90∗1 mm∗mm∗mm achieves satisfactory impedance matching and radiation across the frequency band from 1 to 8GHz with more than 8 octaves. The gain of the antenna is from 4.52 to 10.04 dBi. A prototype of the simulated antenna...
A novel beam-steering cylindrical dielectric resonator antenna (DRA) is presented in this paper. The proposed DRA consists of a cylindrical dielectric resonator with dielectric constant of 80 and two symmetrical microstrip transmission line feeding ports. It is fabricated and mounted on a grounded FR-4 microwave dielectric material. The proposed DRA is analyzed using the high frequency simulation...
A novel dielectric resonator antenna oscillator (DRAO), which realizes dielectric resonator antenna (DRA) and dielectric resonator oscillator (DRO) simultaneously, is presented in this paper. The design procedure of the parallel-feedback type DRAO at dedicated short range communications band is discussed. Firstly, the DRA was three-dimensional simulated by HFSS. Then the DRO was designed based on...
A new millimeter wave spatial power combiner based on broadband multi-way ridged waveguides is designed. The device is composed of a multi-step impedance transformer and eight ridged waveguides. Since the ridged waveguides provide a consistent impedance transformation and a broad band working frequency, a millimeter wave solid-state power amplifier based on the combiner demonstrates an output power...
This paper presents the spatial power combining technique based on new waveguide-to-microstrip antipodal finline array. The technique adopts the structure of broadband multi-way oversized coaxial waveguide which is mainly composed of a twenty-way gradually changed antipodal finline array. The new finline is designed of a complex function of a linear function, a triangular function and an exponential...
This paper design a SRD-based wide-band comb generator. The parameters of a wide-band, short impulse generator circuit are analyzed through designing the generator circuit with output spectrum from 0.5 GHz to 50 GHz, and the results gain nice validation by experiment. The implemented wide-band comb has been applied in receiver and spectrum analyzer.
By using a rigorous numerical technique that is applicable to calculations of modes in waveguides for the TM case, the effects of the periodic rectangular, triangular, sinusoidal, and Gaussian random rough surface on the rectangular waveguide are discussed. The effects of the parameters of the roughness on the mode cutoff frequencies and field distribution are considered, including the height, width,...
A novel broadband transition of Rectangular waveguide-to-Coplanar Waveguide without dielectric substrate is proposed in this paper. The transition without dielectric substrate means a low dielectric loss can be used at higher frequency compared with traditional CPW. The transition is designed based on a thin medal ridge which is approximately a square of cosine. On the other hand, the strip of CPW...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.