Vol. 61
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]
2016-08-19
PIER Letters
Vol. 61, 131-137, 2016
download: 157
A Wideband Dual-Polarized Modified Bowtie Antenna for 2G/3G/LTE Base-Station Applications
Zhao Yang Cilei Zhang Ying-Zeng Yin Yong Wang
A novel wideband dual-polarized antenna is presented for 2G/3G/LTE base-station applications. The proposed antenna consists of two orthogonal modified bowtie dipoles, parasitic elements and a cavity. By using parasitic elements and compact cavity, the antenna achieves a wide impedance bandwidth about 77.3% (VSWR<1.5) for both ports. Both simulated and measured results show that the proposed antenna has a port isolation higher than 31 dB and high gain (>8.5 dBi) over the entire operating band. Moreover, good cross-polarization (>25 dB) performance and a front-to-back ratio better than 20 dB are also verified by measured results.
A WIDEBAND DUAL-POLARIZED MODIFIED BOWTIE ANTENNA FOR 2G/3G/LTE BASE-STATION APPLICATIONS
2016-08-03
PIER Letters
Vol. 61, 125-130, 2016
download: 128
A Planar End-Fire Antenna with Wide Beamwidth for 60 GHz Applications
Rongda Wang Peng Gao Peng Wang Kai Kang
A novel 60 GHz end-fire antenna for point-to-multipoint applications is presented. The prototype of this antenna is a dipole structure with a wide beamwidth. Then, the radiators are tilted with the ground is also modified to improve its directive gain while maintaining wide signal coverage. The antenna has a compact size of 10 mm × 7 mm × 0.254 mm. Measured results show that the antenna has favorable properties of 3-dB beamwidth up to 150° at 60 GHz, S11 less than -10 dB and stable gain of 5.9 to 6.8 dBi over 57 to 64 GHz, where these characteristics denote it fitting for 60 GHz wireless communication systems.
A PLANAR END-FIRE ANTENNA WITH WIDE BEAMWIDTH FOR 60 GHZ APPLICATIONS
2016-07-27
PIER Letters
Vol. 61, 119-123, 2016
download: 1165
Electromagnetic Boundaries with PEC/PMC Equivalence
Ismo Veikko Lindell Ari Sihvola
The most general electromagnetic boundary, defined by linear and local boundary conditions, is defined in terms of conditions which can be called generalized impedance boundary conditions. Requiring that the boundary be equivalent to PEC and PMC boundaries for its two eigenplane waves, which property is known to exist for many of its special cases, it is shown that the recently introduced Generalized Soft-and-Hard/DB (GSHDB) boundary is the most general boundary satisfying this property.
2016-07-26
PIER Letters
Vol. 61, 111-118, 2016
download: 104
Wideband Circularly Polarized Square Slot Array Fed by Slotted Waveguide for Satellite Communication
Min Wang Lei Hu Jingjing Chen Shishan Qi Wen Wu
A wideband circularly polarized (CP) slot array with high radiation efficiency is proposed. The cavity-backed square slots are designed to achieve wideband CP radiation with a unidirectional pattern. The slotted waveguide is adopted to feed the array with high efficiency. The square slot, cavity and feeding slot in the waveguide can be viewed as a radiating element. A CP slot array can be conveniently designed as traditional waveguide slot arrays, once the element admittance characteristic is determined. A 1-by-8 CP array operating at 12.5 GHz has been developed. Measured impedance bandwidth of 6.9%, axial-ratio (AR) bandwidth of 8.8% and a gain of 15.4 dBi have been achieved. This array can be conveniently expanded to a larger wideband CP array with a higher gain, which is preferred for the specific satellite communication applications.
WIDEBAND CIRCULARLY POLARIZED SQUARE SLOT ARRAY FED BY SLOTTED WAVEGUIDE FOR SATELLITE COMMUNICATION
2016-07-22
PIER Letters
Vol. 61, 105-109, 2016
download: 126
Analysis of Different Probe Geometries for Ethanol Fuel Qualification Using Time-Domain Reflectometry
Daniel Bras Rochinha Rodrigues Wesley Beccaro Henrique E. M. Peres Fatima S. Correra
This paper proposes sensors based on the time-domain reflectometry (TDR) technique for qualifying ethanol fuel. Four different probe geometries were proposed: bifilar, microstrip, coaxial, and helical. All probes allowed qualification of ethanol adulterated with water. Helical probe showed the best response. Thus, this proposal contributes to the development of electronic tongues.
ANALYSIS OF DIFFERENT PROBE GEOMETRIES FOR ETHANOL FUEL QUALIFICATION USING TIME-DOMAIN REFLECTOMETRY
2016-07-22
PIER Letters
Vol. 61, 99-103, 2016
download: 168
A Novel W-Band Dual-Polarized Cassegrain Antenna for Cloud Radar
Bing Yu Han Xia Xiaoye Chen Fei Yang Fayu Wan Zhen-Hua Chen Yong Zhou Jun-Xiang Ge
A W-band dual-polarized Cassegrain antenna for cloud radar is proposed. The aperture diameter of the main reflector of the antenna is 50 cm. By using a modified Magic-T structure in the feed horn, the antenna is dual-polarized with high port isolation. The measured results show that the port isolation is 44.7 dB. The gains are 47.3 dB and 49.5 dB for the two ports at 94 GHz, respectively, and the efficiency of the antenna is better than 87%.
A NOVEL W-BAND DUAL-POLARIZED CASSEGRAIN ANTENNA FOR CLOUD RADAR
2016-07-19
PIER Letters
Vol. 61, 91-97, 2016
download: 427
S-Parameters Extraction of a Desired Network with Time-Domain Gates
Lingyu Deng Xiao-Long Chen Yajun Li
A method for extracting a desired network from the composite measurement of a desired and undesired networks combination is proposed. The desired network is required to be a reciprocal and passive network. Time-domain responses are chosen by time-domain gates according to the signal flow diagram of the measured networks. This method can be used to characterize fixtures and de-embed of fixtures effects from the composite measurement of a device under test (DUT) and fixtures combination. This method can also compensate for masking errors. Extraction for the S-parameters of the desired network are described in detail, and the extraction result is validated with two simulations.
S-PARAMETERS EXTRACTION OF A DESIRED NETWORK WITH TIME-DOMAIN GATES
2016-07-15
PIER Letters
Vol. 61, 85-89, 2016
download: 153
A Compact Circularly Polarized Microstrip Antenna with Bandwidth Enhancement
Lumei Li Jianxing Li Bin He Songlin Zhang Anxue Zhang
ƒA novel compact circularly polarized microstrip antenna (CPMA) with bandwidth enhancement is proposed and studied. By employing capacitive loading and inductive loading, the size miniaturization is achieved. The cross-shaped aperture in the ground plane is able to excite two orthogonal modes. The near-equal amplitudes and 90° phase difference between these two modes are realized by properly designing the feed network, i.e., a 0°-90° hybrid comprising a 3-dB Wilkinson power divider cascaded with a 90° phase shifter. The proposed antenna exhibits a global bandwidth of 11.5% ranging from 1.88 GHz to 2.11 GHz with an overall size 50 mm × 50 mm × 6.8 mm (0.33λ0 × 0.33λ0 × 0.045λ0). The global bandwidth is defined where return loss is larger than 10 dB, broadside axial ratio (AR) smaller than 3 dB, and gain above 0 dBic.
A COMPACT CIRCULARLY POLARIZED MICROSTRIP ANTENNA WITH BANDWIDTH ENHANCEMENT
2016-07-15
PIER Letters
Vol. 61, 77-83, 2016
download: 153
A CPW-Fed Dual-Band Slot Antenna with Circular Polarization
Yonghao Xin Quanyuan Feng Jun Tao
In this paper, a coplanar waveguide (CPW)-fed dual-band slot antenna with circular polarization (CP) is presented. In order to achieve CP characteristic, an asymmetric slot and F-shaped end patch are introduced to a conventional rectangular slot antenna. Moreover, by cutting a T-shaped notch on the ground plane, the axial ratio (AR) bandwidth (ARBW) can be extended. The antenna shows left-hand CP (LHCP) radiation in the boresight direction (i.e. +Z direction) at both ARBWs. The proposed antenna is fabricated and measured. The measured results have a good agreement with the simulated ones. The measured impedance bandwidths (|S11| < -10 dB) are 1.08 GHz (2.02 to 3.10 GHz, 40% at 2.70 GHz) and 2.31 GHz (4.57 to 6.88 GHz, 39.8% at 5.8 GHz). The two measured ARBWs are 600 MHz (2.60 to 3.20 GHz, 22.2% at 2.70 GHz) and at least 1.15 GHz (4.85 to 6.0 GHz, 19.8% at 5.8 GHz) at the lower and upper bands, respectively.
A CPW-FED DUAL-BAND SLOT ANTENNA WITH CIRCULAR POLARIZATION
2016-07-14
PIER Letters
Vol. 61, 71-76, 2016
download: 197
Dual Broadband Metamaterial Polarization Converter in Microwave Regime
Dong Yang Hai Lin Xiaojun Huang
Polarization converters based on metamaterial have broad application in imaging, sensing and communication from microwave to optical frequency. However, its performance is limited by single function and narrowband. In this paper, a new type of polarization converter based on square loop shaped metamaterial has been presented. It works in the reflection mode to achieve broadband polarization conversion for both circular and x/y linear polarization waves. The incident linearly polarized wave will be converted to its cross-polarized state with a polarization conversion ratio (PCR) lager than 0.9 in two distinct broad frequency ranges; on the other hand, circularly polarized wave will be reflected to its co-polarized state efficiently in the same spectrum regimes. Good agreements have been observed for both simulation and measurement results. This work offers a further step in developing high performance multi-function microwave or optical devices.
DUAL BROADBAND METAMATERIAL POLARIZATION CONVERTER IN MICROWAVE REGIME
2016-07-13
PIER Letters
Vol. 61, 63-69, 2016
download: 97
A Design of Quasi-Arbitrary Phase Difference Unequal Microstrip Power Divider
Qing He Xiaochen Meng Xiaoping Lou Lianqing Zhu
An unequal power divider which features quasi-arbitrary output phase difference is proposed in this paper. The circuit consists of four microstrip lines and a resister. By the even- and odd-mode analysis technique, the closed-form design equations of this structure are derived. The characteristic impedances, electrical length and bandwidth variations with power division ratio and phase difference are analyzed. For proving its validity, a prototype with this proposed structure is designed and implemented at 1 GHz. The results of simulation and measurement show that the pro-posed power divider can effectively produce two outputs with controllable power division and phase difference.
A DESIGN OF QUASI-ARBITRARY PHASE DIFFERENCE UNEQUAL MICROSTRIP POWER DIVIDER
2016-07-12
PIER Letters
Vol. 61, 55-62, 2016
download: 124
Compact Filtering Power Divider Based on Half Mode Substrate Integrated Waveguide
Ali-Reza Moznebi Kambiz Afrooz
In this paper, a compact filtering power divider (PD) based on half mode substrate integrated waveguide (HMSIW) is presented. The proposed structure is realized by etching slots on the top layer of the HMSIW PD. Accordingly, two resonators are embedded in each patch, as a second order filter. The slots dimensions are obtained by the relationship between them and the extracted external quality factor and coupling coefficient. A good agreement between the simulated and measured results is reported. The measured 3 dB fractional bandwidth is 25% (6.3-8.1 GHz). The maximum insertion loss is 0.9 dB, and the return loss is above 20 dB in the passband. This design has the advantages of low insertion loss, improved out-of-band rejection, compact size, controllable bandwidth, and high selectivity.
COMPACT FILTERING POWER DIVIDER BASED ON HALF MODE SUBSTRATE INTEGRATED WAVEGUIDE
2016-07-08
PIER Letters
Vol. 61, 47-53, 2016
download: 219
Bandwidth and Gain Enhancement for Probe-Fed CP Microstrip Antenna by Loading with Parasitical Patches
Wen-Quan Cao Wei Hong
A novel probe-fed single-layer circularly polarized (CP) truncated microstrip antenna with enhanced CP bandwidth and gain is presented in this paper. The axial ratio (AR) bandwidth is broadened by loading with a circle of truncated square parasitical patches. Parameter analysis is made to investigate the effect of the loading structures on the AR property. For comparisons, both the unloaded and loaded truncated patch antennas with the same size are designed, fabricated and measured. The measurement results show that by adding the parasitical patches, the -10 dB impedance bandwidth was increased from 0.98 GHz (15.9%) to 1.42 GHz (21.5%), among which the 3-dB RHCP AR bandwidth has been increased from 200 MHz (3.3% at the center frequency of 6.04 GHz) to 780 MHz (12.6% at the center frequency of 6.19 GHz). The gain enhancement is about 0.5 dB~1.5 dB around the operating frequency range, and the maximum gain of the proposed antenna is about 9.1 dB. With the advantages of simple structure, wide CP bandwidth and considerable gain property, this antenna has potential application in wireless communications.
BANDWIDTH AND GAIN ENHANCEMENT FOR PROBE-FED CP MICROSTRIP ANTENNA BY LOADING WITH PARASITICAL PATCHES
2016-06-30
PIER Letters
Vol. 61, 39-46, 2016
download: 143
A Compact Quad-Band Bandpass Filter Using Multi-Mode Stub-Loaded Resonator
Lakhindar Murmu Sushrut Das
This paper presents a compact shorted stub-loaded quad-band bandpass filter. The proposed filter simultaneously operates at GSM (0.83-0.97 GHz), LTE2300 (2300-2400 MHz), WiMAX (3.3-3.7 GHz), and WLAN (5.725-5.825 GHz) bands. The filter has been designed using the technique of stub-loaded resonator (SLR). By changing the length of the center-loaded stub, the resonant frequency of the even-mode can be varied without affecting that of the odd-mode. This simplifies the design and tuning of the quad-band filter. Eight transmission zeros (TZs) around the three passband make the pass bands highly isolated. In order to validate its practicability, a quad-band bandpass filter (BPF) has been designed, fabricated and measured. Good agreement between simulated and measured results is observed.
A COMPACT QUAD-BAND BANDPASS FILTER USING MULTI-MODE STUB-LOADED RESONATOR
2016-06-24
PIER Letters
Vol. 61, 31-38, 2016
download: 145
A Circularly-Polarized Microstrip Antenna with Quad-Band Combination
Wei Wang Meng-Jiang Xing Xuyue Guo
In this paper, a novel quad-band combination of circularly-polarized microstrip antenna is proposed. This antenna has multi-frequency and quad-polarization with multiple coaxial probes, which cover four bands of the BeiDou navigation system (BDS), meeting different application requirements. By using a stacked structure to achieve feed and using symmetrical slotted method to place the coaxial probes, the multi-frequency antenna is connected together through the middle co-aperture. Meanwhile, the feed position and size are constantly optimized until get the most suitable one, and the necessary perturbation is obtained. We also introduce a broadband stripline 90° bridge. Ultimately, the circularly-polarized and multi-frequency operation is achieved. Furthermore, the novel design enables easy implementation, miniaturization, wide band, which can meet the application requirements and promote the development of the BDS, which can be combined with the Internet of Things technology, applied to life and production.
A CIRCULARLY-POLARIZED MICROSTRIP ANTENNA WITH QUAD-BAND COMBINATION
2016-06-13
PIER Letters
Vol. 61, 25-30, 2016
download: 167
Broadband and Gain Enhanced Bowtie Antenna with AMC Ground
Xue-Yan Song Chuang Yang Tianling Zhang Ze-Hong Yan Ruina Lian
A low-profile wideband bowtie antenna backed by artificial magnetic conductor (AMC) ground is presented for gain enhancement.The proposed bowtie antenna, loaded with an open stub in the upper layer, has broadband property. By using an AMC reflector,consisting of 6×9 metallic patches, the bidirectional radiation of the bowtie antenna is changed to unidirectional radiation. The distance between the bowtie antenna and the AMC surface is onlyλ/10 at 3.75 GHz. Both the bowtie antenna and the AMC surface are fabricated and measured. The measured results demonstrate good and stable performances, including maximum gain of 8.27 dBi, and flat gain response with variation of 0.6 dB in the wide impedance matching (S11 < -10 dB) band from 3.05 GHz to 4.35 GHz(35.1%). Furthermore, the maximum cross-polarization level is -17 dB for both E and H planes, and the measured front-to-back ratios are more than 18 dB.Good agreement between the simulated and measured results validates the proposed design approach.
BROADBAND AND GAIN ENHANCED BOWTIE ANTENNA WITH AMC GROUND
2016-06-13
PIER Letters
Vol. 61, 19-24, 2016
download: 119
A Dual Band Fractal Slot Antenna Loaded with Jerusalem Crosses for Wireless and WiMAX Communications
Mohammad Sadegh Sedghi Mohammad Naser-Moghadasi Ferdows B. Zarrabi
In this paper, a combination of the Jerusalem cross (JC) as a fractal load and fractal Minkowski slot antenna for dual-band application is investigated. The prototype slot antenna has a Minkowski fractal formation with four Jerusalem cross (JC) loads to achieve dual-band application with compact size to improve the bandwidth. A T-shaped feed line is implemented in the final modeled antenna. The fabricated antenna has a bi-directional pattern with sufficient bandwidth at 2.4-3.1 GHz and 5.1-5.9 GHz with VSWR<2 for Wi-Fi, WiMAX, Bluetooth application as well as an IEEE WLAN protocol with a gain of 5-6 dBi, respectively. The size of the prototype patch antenna is 40×40 mm2, and the antenna is designed and fabricated on an FR-4 low cost substrate with εr=4.4 and thickness of 1.6 mm. It is simulated by HFSS full wave software. In addition, the VSWR, pattern and axial ratio of experimental results are presented and compared with simulation models. As a result, improvements of the Jerusalem cross compared with conventional cross have been achieved with some parameter tuning to improve the band width.
A DUAL BAND FRACTAL SLOT ANTENNA LOADED WITH JERUSALEM CROSSES FOR WIRELESS AND WIMAX COMMUNICATIONS
2016-06-07
PIER Letters
Vol. 61, 13-18, 2016
download: 148
Orbital Angular Momentum Radiation from Circular Patches
Fuchun Mao Tinghua Li Yu Shao Jianfeng Yang Ming Huang
Orbital angular momentum (OAM) with a huge potential application in multiplexing and coding has become the subject of intense research in recent years. This paper presents a method to generate radio beams carrying OAM based on a circular patch antenna. A 3 dB quadrature hybrid is employed in the design to enable the circular patch to reconfigure opposite OAM states of a radiated field. The results of numerical simulations are presented to show that the circular patch radiates two OAM modes with opposite rotation directions simultaneously. The proposed circular patch is believed to be significant to the wireless communication applications due to its simple geometry, low cost, and OAM mode reconfiguration.
ORBITAL ANGULAR MOMENTUM RADIATION FROM CIRCULAR PATCHES
2016-06-06
PIER Letters
Vol. 61, 7-12, 2016
download: 133
Modified Extended Composite Right/Left-Handed Layout Loaded with CSRR for Quad Band Applications
Parya Fathi Zahra Atlasbaf Keyvan Forooraghi
This paper presents the design and implementation of a novel fully planar modified, extended composite right/left-handed transmission lines (E-CRLH-TLs) utilizing a complementary split ring resonator (CSRR) loaded on the ground plane. The multiband behavior of the proposed layout is demonstrated by an equivalent circuit which in this case is distinct from the standard form of the equivalent circuits presented for an E-CTLH-TL; therefore, in order to design a quad band E-CRLH unit-cell, the design procedure is investigated. The main advantages of the proposed layout over other topologies are size reduction and fabrication simplicity which are proved by the design and fabrication of a quad-band Y power divider.
MODIFIED EXTENDED COMPOSITE RIGHT/LEFT-HANDED LAYOUT LOADED WITH CSRR FOR QUAD BAND APPLICATIONS
2016-06-06
PIER Letters
Vol. 61, 1-6, 2016
download: 140
Dual-Band Printed Inverted-F Antenna with a Nested Structure
Takuichi Hirano Junichi Takada
A dual band printed inverted-F antenna with a nested structure is proposed. In this antenna, matching can be controlled for both frequency bands by changing element lengths. The measured and calculated frequency characteristics of the antenna's reflection coefficient match very well, if the measurement cable connector is considered in the simulation. The measured -10 dB relative bandwidths of the reflection coefficient are 4.7% at 2.45 GHz (2.5 GHz to 2.62 GHz), and 9% at 5.5 GHz (5.28 GHz to 5.78 GHz). The calculated radiation efficiencies are 92% and 88%, at 2.45 GHz and 5.5 GHz, respectively, with calculated peak realized gains of 1.07 dBi and 3.36 dBi, respectively.
DUAL-BAND PRINTED INVERTED-F ANTENNA WITH A NESTED STRUCTURE