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2008 IEEE International RF and Microwave Conference最新文献

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The development of statistical parameter measuring analyser using the APD technique for DSL communication 利用APD技术研制用于DSL通信的统计参数测量分析仪
Pub Date : 2008-12-01 DOI: 10.1109/RFM.2008.4897423
A. Abidin, W. Abdullah, M. Jenu, A. Ramli
The amplitude probability distribution (APD) has been proposed within comite international special des perturbations radioelectriques (CISPR) as a measure of the emitted electromagnetic interference from electrical appliances or equipment. The APD approach is effective for estimating the noise impact towards degradation of digital communication performance. This paper presents the development of APD analyzer for simultaneous measurement of noise emission on digital subscriber line (DSL) communication. Noise statistics have been measured by using the analyser. It is vital to have correct measurement set-up, signal power level, sampling rate, sample points and filter characterization in order to acquire accurate data representation of the noise pattern. The APD graph was obtained from computer calculation that using the APD algorithm method which employing existing time ratio. The noises are characterized using alpha-distribution functions that exhibiting its own distinct APD parameters alpha, beta and gamma which will be verified in single modulation scheme for estimation of bit error probability. The analyser will record and analyse results of noise pattern emission from various sources of interference. The analyser provides the platform for interference verification of man-made noise emission towards DSL communication performance.
振幅概率分布(APD)已在国际特殊扰动无线电电学委员会(CISPR)中提出,作为电器或设备发射电磁干扰的度量。APD方法可以有效地估计噪声对数字通信性能退化的影响。本文介绍了同时测量数字用户线路通信噪声发射的APD分析仪的研制。用该分析仪测量了噪声统计量。为了获得噪声模式的准确数据表示,正确的测量设置、信号功率电平、采样率、采样点和滤波器特性至关重要。采用利用已有时间比的APD算法方法,通过计算机计算得到APD图。用α -分布函数来表征噪声,该分布函数表现出自己独特的APD参数α, β和γ,这将在单一调制方案中进行验证,用于估计误码率。分析仪将记录和分析各种干扰源发出的噪声图样的结果。该分析仪为人为噪声发射对DSL通信性能的干扰验证提供了平台。
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引用次数: 1
Single-stage parallel coupled microstrip line bandpass filter using weak coupling technique 采用弱耦合技术的单级平行耦合微带线带通滤波器
Pub Date : 2008-12-01 DOI: 10.1109/RFM.2008.4897457
J. Marimuthu, Mona Riza Mohd Esa, S. Yusof
The frequency-dispersive characteristic of a two-port parallel coupled microstrip line (PCML) can be obtained using equivalent J-inverter network parameters. The latter is obtained from its corresponding admittance parameters. Hence, the behaviour of transmission zero frequency, fundamental response frequency and harmonic response frequency of the PCML can be shown. The former is realigned by varying a centrally located single groove size to suppress the first spurious harmonic passband of the filter. Using the J-inverter parameters, the transmission zero of J-susceptance null of a PCML can be realigned by employing a single groove with specific dimension. This simultaneously cancels the first harmonic resonance. In this paper, the behaviour of the J-inverter parameters with varying coupling gaps is presented. The effect of having weak coupling characteristic is then presented. The proposed technique is then justified by two single-stage bandpass filters of PCML with weak coupling characteristic.
利用等效j型逆变器网络参数,可以得到双端口并联耦合微带线的频散特性。后者由其相应的导纳参数得到。因此,可以显示出PCML的传输零频率、基频响应频率和谐波响应频率的特性。前者通过改变位于中心的单个沟槽大小来抑制滤波器的第一杂散谐波通带来重新排列。利用j型逆变器的参数,采用特定尺寸的单沟槽即可实现对PCML的j型电纳零的传输零的重新对准。这同时抵消了第一次谐波共振。本文给出了j型逆变器参数随耦合间隙变化的特性。然后给出了弱耦合特性的影响。然后用两个具有弱耦合特性的PCML单级带通滤波器验证了所提出的技术。
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引用次数: 5
Implementing WCDMA digital up converter in FPGA 在FPGA上实现WCDMA数字上变频
Pub Date : 2008-12-01 DOI: 10.1109/RFM.2008.4897372
N. M. Zawawi, M. F. Ain, S. Hassan, M. Zakariya, C.Y. Hui, R. Hussin
This paper will discuss the design and implementation of the digital up converter (DUC) in Field Programmable Gate Array (FPGA). DUC is a digital circuit which generating digital intermediate frequency (IF) signal from low complex digital baseband signal. The DUC provides pulse shaping, interpolation and frequency translation where the up-sampled signal is shifted from centered frequency (0 Hz) to intermediate frequency. Due to Wideband Code Division Multiple Access (WCDMA) specifications, the DUC is to pulse shaped and up sampled the baseband signal by a factor of 16. The DUC up sampled the signal up to 61.44 MHz.
本文将讨论现场可编程门阵列(FPGA)中数字上转换器(DUC)的设计与实现。DUC是一种由低复数字基带信号产生数字中频信号的数字电路。DUC提供脉冲整形,插值和频率转换,其中上采样信号从中心频率(0 Hz)转移到中频。由于宽带码分多址(WCDMA)规范,DUC是对基带信号进行16倍的脉冲成形和上采样。DUC up采样信号至61.44 MHz。
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引用次数: 11
Via hole modeling of PZT thin films for MMIC applications 通过MMIC应用中PZT薄膜的孔建模
Pub Date : 2008-12-01 DOI: 10.1109/RFM.2008.4897442
R. A. Bakar, Zaiki Awang, S. Sulaiman, Nor Fazlina Mohd Lazim, Zuhani Ismail Khan
This paper reports on the performance and effects of via holes fabricated in lead zirconate titanate (PZT) thin films intended for microwave integrated circuit applications. Square and cylindrical vias were simulated at microwave frequencies using a 3D electromagnetic simulator. The performance of via hole grounding was then compared to the edge grounding at the PZT/Pt interface. An equivalent circuit model is proposed and the models parameters are extracted. The simulation results showed that using via hole resulted in low inductance (3.848 nH) and resistance (0.017 Omega) values compared to edge grounding technique (L = 10.192 nH and R = 0.074 Omega).
本文报道了微波集成电路用锆钛酸铅(PZT)薄膜中通孔的性能及其影响。利用三维电磁模拟器对微波频率下的方形和圆柱形过孔进行了仿真。然后将过孔接地与PZT/Pt界面边接地的性能进行了比较。提出了等效电路模型,并提取了模型参数。仿真结果表明,与边缘接地技术(L = 10.192 nH, R = 0.074 Omega)相比,采用过孔接地技术的电感(3.848 nH)和电阻(0.017 Omega)值较低。
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引用次数: 1
Measurements of the effect of simulated rain and wind on the offset parabolic receiver antenna at Ku-band frequencies 模拟雨和风对ku波段偏置抛物面接收天线影响的测量
Pub Date : 2008-12-01 DOI: 10.1109/RFM.2008.4897458
K. Sahal Bin Sahaq, S. Hassan
The effect of rain water accumulated on the antenna surfaces during the rain event is one of some other factors that can degrade the system performance at higher frequency-bands like the Ku-band. In this paper we present the results of measurements dealing with the wet antenna attenuation under the influence of simulated wind conditions at Ku band frequencies at different simulated rain rate. Rain water on the antenna surfaces can cause additional significant signal attenuation. The experiments were conducted at USM engineering campus to measure and analysis the attenuation caused by wet antenna under different wind conditions. A Ku band link was constructed using a parabolic offset 0.6 m antenna as receive antenna. A rain simulator was used to simulate various rain rates and an industrial fan was used to simulate the wind conditions. It was found that the wind condition has a reasonable influence on the wet antenna attenuation.
雨水在降雨期间积聚在天线表面的影响是其他一些因素之一,可以降低系统在高频段(如ku频段)的性能。本文给出了不同模拟雨率下Ku波段模拟风条件影响下湿天线衰减的测量结果。雨水落在天线表面会造成额外的显著信号衰减。实验在USM工程校园进行,测量和分析了不同风况下湿天线的衰减。采用抛物线偏置0.6 m天线作为接收天线,构建了Ku波段链路。用模拟雨器模拟不同的雨率,用工业风扇模拟风况。研究发现,风条件对湿天线衰减有一定的影响。
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引用次数: 0
Smart antenna:Weight calculation and side-lobe reduction by unequal spacing technique 智能天线:利用不等间距技术计算天线的权值并减小天线旁瓣
Pub Date : 2008-12-01 DOI: 10.1109/RFM.2008.4897376
M. Tan, S. Rahim, M.T. Ali, T. Rahman
This paper is divided into two parts. The first part presents the study of smart antenna beamforming where a single beam is shaped by weighting and summing the antenna outputs. In order to calculate the weight of the array elements, the conventional beam-former (known as delay and sum) has been chosen. Matlab software is used to calculate the weights, and to obtain the array factor of 8 elements linear array antenna. The second part illustrates that, the side-lobe can be reduced by using unequal spacing technique, but the number of elements is remained unchanged. The comparison between symmetric and asymmetric arrangement for unequal spacing is also presented. The results show that by using the symmetrical arrangement, the side-lobe obtained is much better than asymmetrical arrangement. In fact, the side-lobe produced by asymmetrical arrangement is worse than the equal arrangement.
本文分为两部分。第一部分介绍了智能天线波束形成的研究,其中通过加权和求和天线输出来形成单个波束。为了计算阵元的权重,选择了传统的波束形成器(即延时和波束形成器)。利用Matlab软件计算权重,得到8元线阵天线的阵列因子。第二部分说明了采用不等间距技术可以减少副瓣,但保持元数不变。并对不等间距的对称布置和非对称布置进行了比较。结果表明,采用对称排列得到的副瓣比采用不对称排列得到的副瓣要好得多。事实上,非对称排列产生的副瓣比均匀排列产生的副瓣更差。
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引用次数: 9
A 0.18μm CMOS T/R switch for 900MHz wireless application 用于900MHz无线应用的0.18μm CMOS T/R开关
Pub Date : 2008-12-01 DOI: 10.1109/RFM.2008.4897390
M. H. Siti Maisurah, I. M. Azmi, S. Rasidah, A. I. Abdul Rahim, Y. M. Razman
A single-pole double-throw (SPDT) transmit/receive (T/R) switch for 900 MHz applications has been designed in a 0.18 mum CMOS process. The switch exhibit a 16 dB input 1-dB compression point with output 1-dB compression point of 12.9 dB. At 900 MHz of frequency operation, the switch has excellent characteristics whereby the insertion loss is only around 3 dB and isolation around 40 dB for both transmitting and receiving operations. The proposed switch achieves return loss of -11 dB during these operations with switching response time around 4.5 ns.
设计了一种用于900 MHz应用的单极双掷(SPDT)发送/接收(T/R)开关,采用0.18 μ m CMOS工艺。该开关的输入1-dB压缩点为16db,输出1-dB压缩点为12.9 dB。在900 MHz频率工作时,开关具有优异的特性,即发送和接收操作的插入损耗仅约为3 dB,隔离度约为40 dB。所提出的开关在这些操作期间实现了-11 dB的回波损失,开关响应时间约为4.5 ns。
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引用次数: 6
Circuit modeling of an UWB patch antenna 超宽带贴片天线的电路建模
Pub Date : 2008-12-01 DOI: 10.1109/RFM.2008.4897359
M. H. Badjian, C. Chakrabarty, S. Devkumar, G. C. Hock
An ultra wideband (UWB) patch antenna is analyzed in this paper. The design uses FR-4 substrate with dielectric constant of 4.9 and thickness of 1.6 mm. Circuit model of such antenna is developed under AWR microwave office environment. Obtained results from simulating the antenna in CST microwave studio are then compared with the results taken from the Circuit Model.
对一种超宽带贴片天线进行了分析。本设计采用介电常数为4.9,厚度为1.6 mm的FR-4衬底。建立了该天线在AWR微波办公环境下的电路模型。在CST微波工作室中对天线的模拟结果与电路模型的模拟结果进行了比较。
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引用次数: 15
Co-channel and adjacent channel interference evaluation for IMT-Advanced coexistence with existing fixed systems IMT-Advanced与现有固定系统共存时的同信道和相邻信道干扰评估
Pub Date : 2008-12-01 DOI: 10.1109/RFM.2008.4897356
Z. Shamsan, L. Abdulrazak, T. Rahman
Due to spectrum scarcity and emerging various wireless applications, coexistence and sharing between IMT-advanced and fixed wireless access (FWA) systems becomes a recently critical issue. At WRC-07, ITU-R allocated 3400-3600 MHz band for the coming fourth generation (4G) or IMT-Advanced on a co-primary basis along with existing FWA systems. Therefore, coexistence and sharing requirements like separation distance and frequency separation coordination must be achieved in terms of both co-channel and adjacent channel frequencies. Co-sited the two base stations antennas and non co-sited coexistence of the two systems are analyzed (depending on interference to noise ratio of -6 dB as a standard coexistence criteria). The interference analysis models, adjacent channel interference ratio ACIR and spectral emission mask (SEM) are applied in the mentioned band to extract the additional isolation needed to protect adjacent channel interference. Finally, possible intersystem interference mitigation techniques are suggested.
由于频谱的稀缺和各种无线应用的出现,IMT-advanced和固定无线接入(FWA)系统之间的共存和共享成为近年来的一个关键问题。在WRC-07上,ITU-R为即将到来的第四代(4G)或IMT-Advanced分配了3400-3600 MHz频段,与现有的FWA系统一起共主。因此,必须同时在同信道和相邻信道频率上实现分离距离和频率分离协调等共存和共享要求。对共址两个基站天线和非共址两个系统的共存情况进行了分析(以干扰噪声比- 6db为标准共存准则)。利用干扰分析模型、相邻信道干扰比ACIR和光谱发射掩膜(SEM)在上述频带提取保护相邻信道干扰所需的额外隔离。最后,提出了可能的系统间干扰缓解技术。
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引用次数: 19
Comparative benefits of a low equatorial orbit microwave solar power satellite (SPS) operational demonstrator 低赤道轨道微波太阳能卫星(SPS)运行演示器的比较效益
Pub Date : 2008-12-01 DOI: 10.1109/RFM.2008.4897460
P. Collins, H. Matsuoka
The paper discusses the potential advantages of operating a microwave power-generating solar power satellite demonstrator in low equatorial orbit. Advantages include being able to deliver power to receiving antennas in a dozen countries around the equator many times/day, and enabling progressive growth to become a large scale system, including geo-stationary satellites. Solar power satellites operating at progressively higher altitudes can deliver power to cities at progressively higher latitudes: within 24 degrees of the equator there is potential demand for several hundred GW of power. Planning an international conference to discuss such a project is recommended.
本文讨论了在低赤道轨道运行微波发电太阳能卫星演示器的潜在优势。其优点包括能够每天多次向赤道周围十几个国家的接收天线输送电力,并使逐步增长成为一个大型系统,包括地球静止卫星。在越来越高的高度运行的太阳能卫星可以向越来越高纬度的城市输送电力:在赤道24度以内,有几百吉瓦电力的潜在需求。建议策划一个国际会议来讨论这样一个项目。
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引用次数: 0
期刊
2008 IEEE International RF and Microwave Conference
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