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This paper presents a 1–10 GHz low-noise down-convert mixer RFIC suitable for wideband receivers. A switched transconductor mixing core is adopted to reduce noise at high frequencies. By adding a series inductor to the RF transconductor, a flat 4–5 dB noise figure (NF) and a high gain of 26.5 dB can be achieved over a broad bandwidth out to 10 GHz. A CMOS output amplifier is also integrated on-chip,...
Insertion phase in multi-layered metamaterials play an important role in understanding the constitutive parameters of the material. Simulations and measurements show the distinct large phase change across the frequency band in which the metamaterial exhibits special parameters. This paper addresses the phase behavior for materials that use loops or rings for magnetic properties and rods, wires, or...
In this work, on-chip Wilkinson power divider design with very compact size is proposed. By using bridged-T coils to replace the quarter-wavelength transmission lines in a conventional Wilkinson power divider, the circuit size can be largely reduced while the bandwidth remains almost intact. Specifically, a GaAs two-way power divider with a center frequency of 2.5 GHz and a 15-dB return loss/isolation...
This paper presents a third-order digital tunable bandpass filter based on digitally tunable capacitor loaded open ring resonator. Magnetic dominated mixed coupling is utilized to make the coupling coefficient meet the requirement of stable bandwidth response. Electric source-load coupling is designed to generate a transmission zero for improving the frequency selectivity. This filter is designed,...
In this letter, a composite metasurface for end-fire scattering is designed, fabricated and characterized. Based on the principle of scattering cancelation and method of end-fire antenna array, we proposed the lattice-like arrangement composite metasurface (LACMS). When EM waves normally illuminates on the metasurface, the scattering energy redistributes to the end-fire direction. Compared with the...
This paper proposes a novel heart-shaped band-notched UWB antenna with compact and simple structure. The antenna comprise of a microstrip feeding line, a heart-shaped patch to achieve UWB characteristic, and a defected ground with bevels to obtain good impedance match and stable gain in the operating band. The band-notched characteristic is achieved by a U-shaped slot on the patch. The measured results...
In the paper the microstrip antenna with pattern based on a unit cells composed of patches with boomerang-like shaped slots has been presented. The antenna has the base edges in the center for the higher layer and slots cut along the periphery of the cell with small perpendicular slits in the middle. The square unit cell edge is 4mm length. The antenna was simulated in CST Microwave Studio. The simulations...
This paper presents the design and implementation of a tunable bandpass filter with constant absolute bandwidth. Two types of coupled microstrip lines in the anti-parallel and pro-parallel formats with varactor-loaded ⋋/2 resonators are investigated to demonstrate its advanced capacity in control of the bandwidth variation. In this design, two adjacent resonators are coupled with each other through...
In this paper, a novel analogue tunable bandpass filter with constant absolute bandwidth is presented. The filter is designed based on full wavelength microstrip open ring resonators loaded with varactors. Magnetic dominated mixed coupling is designed to make the coupling coefficient meet the requirement of constant absolute bandwidth response. The filter is designed, fabricated and measured. The...
In-situ characterisation of thermocouple sensors is a challenging problem. Recently the authors presented a blind characterisation technique based on the cross-relation method of blind identification. The method allows in-situ identification of two thermocouple probes, each with a different dynamic response, using only sampled sensor measurement data. While the technique offers certain advantages...
Currently, the needs of communication system with a wide bandwidth is large enough. One antenna that can be used to realize communication with a wide bandwidth is log periodic antenna. To observe the effect of element length, the distance between elements, and the width of dipole elements used in log periodic antenna then do research to design and realize the antenna log periodic dipole array (LPDA)...
This paper investigates the development of branchline coupler using parallel coupled transmission lines on planar microstrip using CST Studio Suite 2010 design tool. This project operates within 4 GHz to 8 GHz frequency band. Two designs are proposed in this project which are basic branch line coupler and branch line coupler with parallel line feeding technique. The main purpose of this study is to...
Because the ability of handling multiple signals at the same arriving time and has a high intercept probability, wideband Channelized receiver has become a hot research topic in domestic and foreign. Channelized receiver based on polyphase filtering has less computational and more channels. In this paper, a new efficient structure model based on real signal non-maximally decimated channelization is...
The recent advancing in click analyser technology aims at reducing costs and time required to perform a full CISPR 14-1 compliant click measurement. The two relevant approaches to achieve costs and time reductions are, respectively, the use of Fast Fourier Transform (FFT) EMI receivers and performing the threshold calculation and actual measurement in a single run (single-run systems). However, there...
This paper presents a novel substrate integrated dual-wideband magneto-electric (ME) dipole antenna for WLAN and WiMAX applications. By employing a ladder-shaped feeding structure to excite the dual-layer electric dipole radiated patches, a dual-band feature can be acquired. Besides, by using the ladder-shaped feeding structure and the printed metal via technology, the impedance matching can be easily...
In this study, a compact high selectivity wideband bandpass filter (BPF) based on parallel-coupled stub-loaded resonator is proposed. The operating bandwidth and return loss can be adjusted by changing the coupling coefficient of the parallel-coupled line and the characteristic impedance of the central loaded stub. Good frequency selectivity and harmonic suppression are realized due to four transmission...
The letter presents a fourth-harmonic mixer based on planar schottky diode working at 330–500GHz. The result of simulation predicts that conversion loses well below 14dB from 369GHz to 477GHz with 6 dBm of local oscillator power. Therefore, the good performance of mixers in wide bandwidth and low conversion loss provides designers with a better choice.
A linear-to-circular polarization conversion transmitter is proposed using 3 × 3 periodic metallic strips, which are twisted 900 in the upper and bottom layers. The metallic strips are printed on both sides of the dielectric substrate that are subjected to enhance the axial ratio bandwidth at resonance frequencies. The proposed structure is excited by a normal incident of x-linearly polarized wave,...
Fast steering mirrors (FMSs) are used in various applications like optical scanning of surfaces, feature detection or beam steering for optical communication systems. This paper introduces Lissajous scan trajectories to improve the tracking performance of a commercial FSM scanning system. The design of a dual tone (DT) feedback controller is presented that is tailored to this type of trajectory and...
This paper presents a low cost and efficient method to compensate the phase and magnitude errors of transmitting ultra-wideband (UWB) linear frequency modulation (LFM) waveform with complex pre-distortion correction coefficients. In this method, a high linearity LFM waveform is generated by a direct digital synthesis (DDS) module. The phase and magnitude errors of the output LFM signal are sampled...
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