Vol. 27
Latest Volume
All Volumes
PIERL 108 [2023] PIERL 107 [2022] PIERL 106 [2022] PIERL 105 [2022] PIERL 104 [2022] PIERL 103 [2022] PIERL 102 [2022] PIERL 101 [2021] PIERL 100 [2021] PIERL 99 [2021] PIERL 98 [2021] PIERL 97 [2021] PIERL 96 [2021] PIERL 95 [2021] PIERL 94 [2020] PIERL 93 [2020] PIERL 92 [2020] PIERL 91 [2020] PIERL 90 [2020] PIERL 89 [2020] PIERL 88 [2020] PIERL 87 [2019] PIERL 86 [2019] PIERL 85 [2019] PIERL 84 [2019] PIERL 83 [2019] PIERL 82 [2019] PIERL 81 [2019] PIERL 80 [2018] PIERL 79 [2018] PIERL 78 [2018] PIERL 77 [2018] PIERL 76 [2018] PIERL 75 [2018] PIERL 74 [2018] PIERL 73 [2018] PIERL 72 [2018] PIERL 71 [2017] PIERL 70 [2017] PIERL 69 [2017] PIERL 68 [2017] PIERL 67 [2017] PIERL 66 [2017] PIERL 65 [2017] PIERL 64 [2016] PIERL 63 [2016] PIERL 62 [2016] PIERL 61 [2016] PIERL 60 [2016] PIERL 59 [2016] PIERL 58 [2016] PIERL 57 [2015] PIERL 56 [2015] PIERL 55 [2015] PIERL 54 [2015] PIERL 53 [2015] PIERL 52 [2015] PIERL 51 [2015] PIERL 50 [2014] PIERL 49 [2014] PIERL 48 [2014] PIERL 47 [2014] PIERL 46 [2014] PIERL 45 [2014] PIERL 44 [2014] PIERL 43 [2013] PIERL 42 [2013] PIERL 41 [2013] PIERL 40 [2013] PIERL 39 [2013] PIERL 38 [2013] PIERL 37 [2013] PIERL 36 [2013] PIERL 35 [2012] PIERL 34 [2012] PIERL 33 [2012] PIERL 32 [2012] PIERL 31 [2012] PIERL 30 [2012] PIERL 29 [2012] PIERL 28 [2012] PIERL 27 [2011] PIERL 26 [2011] PIERL 25 [2011] PIERL 24 [2011] PIERL 23 [2011] PIERL 22 [2011] PIERL 21 [2011] PIERL 20 [2011] PIERL 19 [2010] PIERL 18 [2010] PIERL 17 [2010] PIERL 16 [2010] PIERL 15 [2010] PIERL 14 [2010] PIERL 13 [2010] PIERL 12 [2009] PIERL 11 [2009] PIERL 10 [2009] PIERL 9 [2009] PIERL 8 [2009] PIERL 7 [2009] PIERL 6 [2009] PIERL 5 [2008] PIERL 4 [2008] PIERL 3 [2008] PIERL 2 [2008] PIERL 1 [2008]
2011-11-22
PIER Letters
Vol. 27, 179-187, 2011
download: 116
Terrestrial Mode Quadrifilar Helix Antenna
Muhammad Amin Jawad Yousaf Mirza Khalid Amin
In this paper we present a modification to the QHA whereby a gap is introduced at the current minima points at the centre of the helical sections of the QHA. The linear and rotational movement between the two halves of the QHA against each other is optimised to get current distribution, so that when tilted 90°, it generates omnidirectional radiation pattern required for land communications in addition to hemispherical radiation pattern for space mode which is obtainable in conventional configuration. This makes it possible to use the single antenna for both terrestrial and satellite communications. The simulated results are validated by experimental measurements.
TERRESTRIAL MODE QUADRIFILAR HELIX ANTENNA
2011-11-21
PIER Letters
Vol. 27, 171-178, 2011
download: 107
Experimental Investigations on a Surface Micromachined Tunable Low Pass Filter
Vittal Janardhana Naga Sayanu Pamidighantam Neela Chattoraj Jibendu Roy Srinivasa Kuppireddi Raghavendra Govindra Kulkarni
In this paper, a surface micromachined microwave tunable low pass filter, consisting of tunable shunt capacitors and series inductors, has been realized. The filter exhibits insertion loss of less than 1 dB (up to 10 GHz), stop band attenuation of 20 dB at 20 GHz, and cut-off frequency is changed to 8 GHz with the application of DC actuation voltage in the structure. The filter has an overall dimension of 5.5 mm x 2 mm. The characteristics of tunable filter are investigated with and without packaging.
EXPERIMENTAL INVESTIGATIONS ON A SURFACE MICROMACHINED TUNABLE LOW PASS FILTER
2011-11-18
PIER Letters
Vol. 27, 161-169, 2011
download: 99
Range Doppler Algorithm for Bistatic SAR Processing Based on the Improved Loffeld's Bistatic Formula
Xin Wang Dai-Yin Zhu
This paper presents a new range Doppler algorithm (RDA) for bistatic synthetic aperture radar (SAR) processing in a general configuration based on a bistatic point target reference spectrum: the improved extended Loffeld's bistatic formula (ILBF). The ILBF spectrum is proved to be comparably accurate with the spectrum derived using the method of series reversion (MSR). Based on the expansion of the ILBF spectrum, a new bistatic RDA is developed to process the azimuth invariant and variant bistatic SAR data. Compared with existing bistatic RDA, the new algorithm has a simpler formulation and is able to cope with moderate or high squint bistatic SAR data. The simulated data in the azimuth invariant and variant bistatic configurations are used to validate the new algorithm.
RANGE DOPPLER ALGORITHM FOR BISTATIC SAR PROCESSING BASED ON THE IMPROVED LOFFELD'S BISTATIC FORMULA
2011-11-14
PIER Letters
Vol. 27, 151-160, 2011
download: 135
A Three-Phase Voltage-Controlled Oscillator Using a Composite LC Transmission-Line Resonator
Sheng-Lyang Jang Yu-Sheng Lin Chia-Wei Chang Miin-Horng Juang
This paper presents a new three-phase LC-ring voltage controlled oscillator (VCO) using the TSMC 0.18μm 1P6M CMOS process. The VCO consists of three single-ended complementary Colpitts VCOs coupled via a varactor ring. Tuning range of VCO is 0.59 GHz, from 8.22 GHz to 8.81 GHz, while the control voltage was tuned from 0 V to 1.1 V and the VCO core power consumption is 2.82 mW at the supply voltage of 1.1 V. The measured phase noise is -118.14 dBc/Hz at 1 MHz offset frequency from 8.40 GHz. The VCO occupies a chip area of 1.018×0.74 mm2 and provides a figure of merit of -192.14 dBc/Hz.
A THREE-PHASE VOLTAGE-CONTROLLED OSCILLATOR USING A COMPOSITE LC TRANSMISSION-LINE RESONATOR
2011-11-09
PIER Letters
Vol. 27, 141-150, 2011
download: 110
Crossed Oval-Ring Slot Antenna with Triple-Band Operation for WLAN/WiMAX Applications
De Shui Cai Zhen-Ya Lei Han Chen Gao-Li Ning Rong Bing Wang
This paper presents the design of a crossed oval-ring microstrip slot antenna to achieve triple-frequency operation for WLAN/WiMAX applications. The proposed antenna is composed of a rectangular microstrip feed line and a ground plane on which three crossed oval-ring slots are etched. The three crossed slot loops finally excite three resonant modes and the resonant frequencies of the proposed antenna are mainly controlled by the dimensions and locations of the slot loops. The antenna prototype is fabricated and the characteristics are experimentally verified. The measured impedance bandwidths for triple operating bands can reach 840/670/940 MHz with return losses larger than 10 dB, which is enough for WLAN/WiMAX communication. In addition, good radiation characteristics with moderate peak gains are obtained and the measured and simulated results show a good agreement.
CROSSED OVAL-RING SLOT ANTENNA WITH TRIPLE-BAND OPERATION FOR WLAN/WIMAX APPLICATIONS
2011-11-08
PIER Letters
Vol. 27, 133-140, 2011
download: 131
A Wavelet Operator on the Interval in Solving Maxwell's Equations
Guido Ala Elisa Francomano Fabio Viola
In this paper, a differential wavelet-based operator defined on an interval is presented and used in evaluating the electromagnetic field described by Maxwell's curl equations, in time domain. The wavelet operator has been generated by using Daubechies wavelets with boundary functions. A spatial differential scheme has been performed and it has been applied in studying electromagnetic phenomena in a lossless medium. The proposed approach has been successfully tested on a bounded axial-symmetric cylindrical domain.
A WAVELET OPERATOR ON THE INTERVAL IN SOLVING MAXWELL'S EQUATIONS
2011-11-07
PIER Letters
Vol. 27, 125-132, 2011
download: 110
Optimal Electric Wave Propagation Parameters on a Transmission Line --- Schottky Diode System
Tristan Dubois Jeremy Raoult Sylvie Jarrix Amable Blain Adrien Doridant
This paper explores the optimal conditions for wave propagation on a microstrip line loaded by a Schottky diode. Investigations are undertaken by studying the transmitted power versus frequency, power and place of injection of a continuous sine high frequency aggression signal. The aggression is injected in a near-field mode. Coupling conditions between the aggression signal in the 500 MHz-3 GHz frequency band and the system is thus determined.
OPTIMAL ELECTRIC WAVE PROPAGATION PARAMETERS ON A TRANSMISSION LINE --- SCHOTTKY DIODE SYSTEM
2011-11-05
PIER Letters
Vol. 27, 117-123, 2011
download: 128
Super-Wideband Printed Asymmetrical Dipole Antenna
Xiu-Hua Jin Xiao-Dong Huang Chong-Hu Cheng Lei Zhu
The proposed dipole antenna consists of two printed strips with unequal lengths and is fed by a coplanar strip (CPS) line. As the antenna parameters and port impedance are properly selected, a super wide operating band (|S11|<-10 dB) of 3.5 to 20.0 GHz is realized. Antenna samples were fabricated using standard PCB process. The area of the constructed dipole antenna is 40.0x5.0 mm2. The S-parameter measurement was performed via a transition (CPS to double-sided parallel strip line) and transformer (190 to 50 Ohm). The measured fractional bandwidth achieved 139.3% (from 3.4 to 19.0 GHz) as predicted, over which the antenna peak gain is better than 0 dBi.
SUPER-WIDEBAND PRINTED ASYMMETRICAL DIPOLE ANTENNA
2011-11-05
PIER Letters
Vol. 27, 101-115, 2011
download: 101
Applications of a Three-Dimensional FDTD Method with Weakly Conditional Stability to the Analysis of Microstrip Filters with Fine Scale Structures
Jing Lan Yang Yang Jing Yi Dai
In three-dimensional space, the hybrid implicit-explicit finite-difference time-domain (HIE-FDTD) method is weakly conditionally stable, only determined by two space-discretizations, which is very useful for problems with fine structures in one direction. Its numerical dispersion errors with nonuniform cells are discussed and compared in this paper. To enlarge the applicable field of the HIE-FDTD method to open space, the absorbing boundary conditions (ABCs) for this method are also introduced and applied. Two microstrip filters with fine scale structures in one direction are solved by the HIE-FDTD method. Conventional FDTD method and alternating-direction implicit FDTD (ADI-FDTD) method are also used for comparing. Results analyzed by the HIE-FDTD method agree well with those from conventional FDTD, and the required central process unit (CPU) time is much less than that of the ADI-FDTD method.
APPLICATIONS OF A THREE-DIMENSIONAL FDTD METHOD WITH WEAKLY CONDITIONAL STABILITY TO THE ANALYSIS OF MICROSTRIP FILTERS WITH FINE SCALE STRUCTURES
2011-11-03
PIER Letters
Vol. 27, 93-99, 2011
download: 134
Design of Dual-Band Bandstop Coplanar Waveguide Filter Using Uniplanar Series-Connected Resonators
Ousama Abu Safia Amjad Omar Maximilian C. Scardelletti
This paper proposes a new design of coplanar waveguide dual-band bandstop filter (DBBSF) with center frequencies at 1.8 GHz and 2.8 GHz. A lumped element model of four series-connected parallel LC resonators are derived, then implemented using compact CPW resonators patterned in the center conductor. The measured and simulated responses are in good agreement which validates the design.
DESIGN OF DUAL-BAND BANDSTOP COPLANAR WAVEGUIDE FILTER USING UNIPLANAR SERIES-CONNECTED RESONATORS
2011-11-01
PIER Letters
Vol. 27, 85-91, 2011
download: 173
Direct Coupling Matrix Synthesis of Bandstop Filters
Eden Corrales Pedro de Paco Oscar Menendez
This work presents a straightforward way to obtain the coupling matrix of a bandstop filtering response from the original bandpass coupling matrix. The generated bandstop coupling matrix implements a response where the bandwidth is defined at the equiripple return loss of the lower and the upper passbands.
DIRECT COUPLING MATRIX SYNTHESIS OF BANDSTOP FILTERS
2011-10-30
PIER Letters
Vol. 27, 75-83, 2011
download: 153
K Band Wilkinson Power Divider Based on a Taper Equation
Sen Huang Xiaoqiang Xie Bo Yan
In this paper, a microstrip circuit structure for a K-Band Wilkinson power divider is presented. The designed power divider is composed of two-step taper stubs based on empirical equations. The symmetry of this circuit allows a half circuit analysis through looking at the odd- and even-model excitations. To demonstrate its performance, the proposed Wilkinson power divider has been fabricated and tested. Results show that the measured insertion loss is less than 0.3 dB and that the output reflection, input reflection and isolation are better than 16 dB, 22 dB, 16 dB, respectively, in the frequency range from 18 GHz to 27 GHz.
K BAND WILKINSON POWER DIVIDER BASED ON A TAPER EQUATION
2011-10-26
PIER Letters
Vol. 27, 63-73, 2011
download: 100
Dual-Broadband Twin-Pair Inverted-L Shaped Strip Antenna for WLAN/WiMAX Applications
Wen-Chung Liu Yang Dai
A simple and novel printed monopole antenna with dual broad operating bands is presented. The antenna fed by a 50-Ω microstrip line is composed by dual twin-pair inverted-L shaped strips as well as a small back truncated ground. By properly selecting widths of these inverted-L shaped stripes, dual broad bandwidths formed from triple resonances to meet the band requirement of the 2.4/5.2/5.8 WLAN or the 2.5(3.5)/5.5 GHz WiMAX standard can be achieved. Experimental results for case of the obtained antenna prototype suitable for use in a 2.4/5.2/5.8 GHz WLAN system have been done and shown good agreement with simulation. Good radiation performances including dual wide bandwidths of 270 MHz and 3.16 GHz, high average antenna gains of ≥ 2.6 and 4.6 dBi, and monopole-like radiation patterns over the two operating bands, respectively, make this antenna a good candidate for use in the modern dual-broadband wireless communication system.
DUAL-BROADBAND TWIN-PAIR INVERTED-L SHAPED STRIP ANTENNA FOR WLAN/WIMAX APPLICATIONS
2011-10-21
PIER Letters
Vol. 27, 53-62, 2011
download: 114
A Novel Trapezoidal Slot Patch Antenna with a Beveled Ground Plane for WLAN/WiMAX Applications
Jiao-Jiao Xie Ying-Zeng Yin Cai Wen Zhang Biao Li
A novel trapezoidal slot patch antenna with an embedded trapezoidal strip is proposed for satisfying wireless local area network (WLAN) and worldwide interpretability for microwave access (WiMAX) applications simultaneously. The proposed antenna consists of a rectangular radiation patch with an etched trapezoidal slot and an embedded trapezoidal strip on the top and a beveled ground on the bottom side. By carefully selecting the width of the radiation patch and length of the beveled ground, the proposed antenna can generate two separate bands. The measured results show that the 10 dB return loss bandwidths of the proposed antenna are 430 MHz (2.30-2.73 GHz) and 3460 MHz (3.21-6.67 GHz), which can cover both the WLAN bands (2.4-2.484 GHz, 5.15-5.35 GHz, and 5.725-5.825 GHz) and the WiMAX bands (2.4-2.6 GHz, 3.4-3.6 GHz, and 5.25-5.85 GHz). Furthermore, good omnidirectional radiation patterns with appreciable gain are obtained over the operating bands.
A NOVEL TRAPEZOIDAL SLOT PATCH ANTENNA WITH A BEVELED GROUND PLANE FOR WLAN/WIMAX APPLICATIONS
2011-10-19
PIER Letters
Vol. 27, 43-51, 2011
download: 118
Tunable Multi-Channel Filtering Using 1-D Photonic Quantum Well Structures
Bhuvneshwer Suthar Anami Bhargava
In the present study, we show that it is possible to achieve multi-channel filters in one-dimensional photonic crystals using photonic quantum well structures. The photonic quantum well structure consists of different 1-D photonic structures. We use (AB)8/Cn/(BA)8 structure, where A, B and C are different materials. The number of defect layers (C) can be utilized to tune the multi-channel filtering. The filter range can be tuned for desired wavelength with the change in angle of incidence for multi-channel filtering.
TUNABLE MULTI-CHANNEL FILTERING USING 1-D PHOTONIC QUANTUM WELL STRUCTURES
2011-10-18
PIER Letters
Vol. 27, 33-42, 2011
download: 126
Realization of Millimeter-Wave Dual-Mode Filters Using Square High-Order Mode Cavities
Yuan Dan Dong Wei Hong Hong Jun Tang
Some interesting results are presented in this paper by investigating the characteristics of square high-order mode cavities. Based on the standard printed circuit board (PCB) process and the substrate integrated waveguide (SIW) technology, two different square cavities which exhibit dual-mode filtering response are studied and implemented. Their bandwidths can be controlled by adjusting the eigen-frequencies of the resonating modes and the coupling apertures. The proposed configurations also allow implementing transmission zeros to improve the selectivity in an easy way. A Q-band quasi-elliptic filter using such two cavities in a folded configuration is designed, fabricated and measured. High selectivity and small insertion loss are achieved which are in good agreement with the simulated results.
REALIZATION OF MILLIMETER-WAVE DUAL-MODE FILTERS USING SQUARE HIGH-ORDER MODE CAVITIES
2011-10-16
PIER Letters
Vol. 27, 25-31, 2011
download: 125
A Miniaturized Wilkinson Power Divider Using DGS and Fractal Structure for GSM Application
Nisha Gupta Pallabi Ghosh Megha Toppo
This paper proposes a miniaturization method for conventional Wilkinson Power Divider(WPD) by replacing the quarter wave sections with the help of fractals. The performance degradation is compensated by using Defected Ground Structure (DGS). The resultant device occupies 56% of the area in comparison to the conventional WPD. The simulation results show a reflection coefficient of -66.98 dB and isolation of 24.1021 dB at the centre frequency of 1.8 GHz. Finally a prototype model is developed on a low cost FR4 Glass Epoxy substrate and tested. The experimental results show a good agreement with the simulation results.
A MINIATURIZED WILKINSON POWER DIVIDER USING DGS AND FRACTAL STRUCTURE FOR GSM APPLICATION
2011-10-06
PIER Letters
Vol. 27, 17-24, 2011
download: 115
Calibration of a Six-Port Receiver for Direction Finding Using the Artificial Neural Network Technique
Hao Peng Ziqiang Yang Tao Yang
Because of the asymmetry of six-port junctions and the nonlinearity of diode detectors, the calibration of direction finding receivers have to be carefully considered. It is generally believed that an efficient tool for numerical approximations, the artificial neural network (ANN), may be used for such calibrations. In this paper, a new calibration technique based on the ANN is proposed for direction finding receivers at a bandwidth of 1 GHz. The direction finding system adopts a zero-intermediate frequency receiver architecture, which offers the advantage of fast response times. The key modules of this receiver consist of two six-port networks used to measure phase differences and operating frequencies. The results indicate that the calibration technique achieves a high accuracy of 0.192°.
CALIBRATION OF A SIX-PORT RECEIVER FOR DIRECTION FINDING USING THE ARTIFICIAL NEURAL NETWORK TECHNIQUE
2011-09-25
PIER Letters
Vol. 27, 9-16, 2011
download: 100
Duplexers and Multiplexers Based on Microstrip Line Loaded with Complementary Split Ring Resonators
Eduardo Jarauta Francisco J. Falcone Miguel Beruete Jesús Illescas
On the basis of backward coupling and left-handed microstrip line, new designs of duplexers and multiplexers will be presented and tested in different configurations. By using microstrip lines with Complementary Split Ring Resonators (CSRRs) etched on the ground plane along with series capacitive gaps in the upper conductor, forward coupling will be inverted into backward coupling. Compact size and fully planar fabrication techniques are important characteristics in the devices proposed.
DUPLEXERS AND MULTIPLEXERS BASED ON MICROSTRIP LINE LOADED WITH COMPLEMENTARY SPLIT RING RESONATORS
2011-09-25
PIER Letters
Vol. 27, 1-8, 2011
download: 146
Dual-Band Ortho-Mode Transducer with Irregularly Shaped Diaphragm
Yun Tao Zhongxiang Shen Gang Liu
A compact dual-band ortho-mode transducer is presented in this paper. Two orthogonally polarized signals received by a square waveguide are separated into two orthogonal channels at 10.7-12.75 GHz and 10.3-11.9 GHz, respectively, while a single-polarized signal is transmitted at 14-14.5 GHz. To obtain good isolation between the transmit (Tx) and receive (Rx) channels of the same polarization with a compact size, an irregularly shaped diaphragm is proposed as a compact dual-function resonator, which has one transmission zero at the Tx band and one pole at the Rx band. The designed OMT is fabricated and measured in a back-to-back configuration. Measured results agree very well with simulated ones and the isolation improvement by the diaphragm is about 15 dB, which verifies our design.
DUAL-BAND ORTHO-MODE TRANSDUCER WITH IRREGULARLY SHAPED DIAPHRAGM