Search results for: Chan-Wang Park
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In this paper, a split ring resonator (SRR) loaded with cylindrical dielectric resonator antenna (DRA) for application in wideband circularly polarized presented has been presented. The orthogonal mode in DRA is excited by using a question shaped microstrip feed line to realized circular polarization. Here SRR is used for input impedance matching only. In this antenna HEM11δ mode has been excited...
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In this paper, a CPW-fed compact wideband concentric SRR-based metamaterial antenna is designed and proposed. The proposed antenna consists of three concentric split ring resonators (SRRs) and one closed ring resonator (CRR) meeting the various standard wireless frequency specifications such as 802.11 a/h/n/p/ac/ax, ISM band (5.8 GHz) and WiMAX. The designed antenna shows dual-band characteristics...
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A compact, ultra wideband antenna with two notch bands has been proposed in this paper. The proposed structure consists of a chamfered circular patch slot antenna with an elliptical complimentary split ring resonator and a partial ground plane. Band notch operation is achieved by exciting rectangular split ring resonators at 5.5 GHz and elliptical complimentary split ring resonator at 3.5 GHz for...
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Microwave and Optical Technology Letters > 56 > 10 > 2313 - 2320
To achieve a first‐pass design for a high efficiency inverse class‐F power amplifier, this article proposes a characterization procedure using the multiharmonic source and load pull tuner system. The transistor is analyzed in terms of the power added efficiency and the output power by considering harmonic frequencies. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:2313–2320, 2014
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Microwave and Optical Technology Letters > 56 > 6 > 1412 - 1418
This article presents a novel wideband GaN HEMT power amplifier (PA) using microstrip radial stub (MRS) to realize wideband harmonic suppression. The angle and the bottom length of MRS are analyzed. One wideband PA is fabricated using MRS in both input and output matching networks to demonstrate this wideband method. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1412–1418, 2014
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In this paper, a novel 10W substrate integrated waveguide (SIW) high power amplifier (HPA) designed with SIW matching network (MN) is presented. The SIW MN is connected with microstrip line using microstrip-to-SIW transition. An inductive metallized post in SIW is employed to realize impedance matching. At the fundamental frequency of 2.14 GHz, the impedance matching is realized by moving the position...
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Microwave and Optical Technology Letters > 55 > 10 > 2469 - 2475
This article presents a novel multiband matching network (MN) consisting of resonators and conventional L‐type MNs. The simple and independent matching procedure for each operating frequency band is presented. One concurrent dual‐band and tri‐band power amplifiers with low cost and compact size are designed to demonstrate this multiband method. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol...
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In this paper, for the first time a novel 10W half mode substrate integrated waveguide (HMSIW) power amplifier (PA) with high power added efficiency (PAE) is presented. The matching network (MN) of the HMSIW PA is designed with microstrip-to-HMSIW transition and HMSIW bandpass filter. The HMSIW bandpass filter is employed in both input and output MNs to suppress the 2nd harmonic of 2.14 GHz, according...
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In this paper, a novel half mode substrate integrated waveguide (HMSIW) 10W power amplifier (PA) designed with HMSIW matching network (MN) is presented for the first time. The HMSIW-based matching network (MN) is designed with microstrip-to-HMSIW transition and an inductive metalized post in HMSIW. The impedance matching for the fundamental frequency 2.14 GHz is realized by moving the position of...
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In this paper, a shifting method of the calibrated region of passive source/load pull tuners by choosing accessories' S-parameters in the source/load pull tuner system is introduced. To increase Γ of the passive source/load pull tuner at DUT reference plane in a target region of Smith chart, the calibrated region of the tuner can be shifted intentionally to the desired region by choosing the accessories...
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In this paper, a novel 10W substrate integrated waveguide (SIW)-based GaN HEMT power amplifier (PA) using SIW-based filter in both input and output matching networks to suppress up to the 4th harmonic of 2.14 GHz is analyzed, fabricated, and tested. By connecting two SIW-based stubs with one microstrip-based stub, applying the cutoff frequency characteristic of post-wall waveguide structure, the SIW-based...
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In this paper, a GaN HEMT transistor is characterized at 3.5 GHz by passive multi-harmonic source & load pull tuner system in large signal. In order to analyze the effect on PAE and output power from the source and load impedance at fundamental, 2nd and 3rd harmonic frequencies, multi-harmonic source and load pull tuner are used. By using this source & load pull tuner system, Cree's GaN HEMT...
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In this paper, field programmable gate array (FPGA) implementation of two power amplifier (PA) dynamic behavioral modeling approaches with real-valued time-delay neural network (RVTDNN) and real-valued recurrent neural network (RVRNN) architectures are presented. The proposed PA models are based on the multilayer perceptron (MLP) neural networks with delayed inputs to take into account nonlinearity...
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In this paper, for the first time a novel substrate integrated waveguide (SIW)-based 10W power amplifier (PA), designed with conductor-backed coplanar waveguide (CBCPW)-to-SIW transition matching network (MN), is presented. Transition between CBCPW and SIW is employed for both input and output MN designs, the proposed SIW PA can be easily connected with any microstrip or SIW-based circuits. Asymmetrical...
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In this paper, a novel wideband GaN HEMT power amplifier (PA) using microstrip radial stub (MRS) in both input and output matching networks to suppress harmonic components of 2.14 GHz is analyzed, fabricated, and tested. The angle subtended by MRS and the bottom length of MRS are analyzed for harmonic suppressing purpose. The wideband harmonic suppressing characteristic of MRS is compared with normal...
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This paper presents a novel multiband Pi-shaped structure with resonators. By employing resonators in conventional Pi-shaped structure, multiband quarter wavelength transmission line is achieved. In order to demonstrate our proposed multiband structure, we designed and fabricated tri-band Wilkinson power divider and tri-band rat-race coupler. We can reduce the size by sharing the stub with resonators...
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10th IEEE International NEWCAS Conference > 109 - 112
FPGA-Implementation of pipelined real-valued time-delay neural network (RVTDNN) for power amplifier modeling is presented in this paper. Pipelined and pseudo-conventional RVTDNN architectures are implemented on their parallel forms to exploit the inherent concurrent computing tasks of field programmable gate array (FPGA). The proposed pipelined architecture is based on the delayed back-propagation...
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Analog Integrated Circuits and Signal Processing > 2012 > 73 > 3 > 819-828
In this paper, we propose new architectures for FPGA-implementation of a dynamic neural network power amplifier behavioral modeling. The real-valued time-delay neural network (RVTDNN) and the backpropagation (BP) learning algorithm were implemented on FPGA using Xilinx system generator for DSP and the Virtex-6 FPGA ML605 evaluation kit. Different RVTDNN architectures are proposed for various values...
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This paper introduces an improved detector topology which is used to design the rectifier that is a part of a rectenna, operating in the S-band. Our proposition adds a third diode into the conventional half bridge detector, leading to improve the output DC voltage and to reduce the harmonics power level. Then, a rectifying circuit is built using two approaches. The first rectifier is based on a HSMS2822...
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This paper presents a new high-speed FPGA implementation of a pipelined adaptive multilayer perceptron (MLP). The proposed approach is a fully parallel architecture based on the delayed backpropagation algorithm, which permits to reduce the critical path and consequently increases the operating frequency. Results obtained with nonlinear function approximation show that this pipelined parallel architecture...
