共查询到20条相似文献,搜索用时 109 毫秒
1.
用六端口和开口同轴线测量介电常数的一种校准方法 总被引:3,自引:0,他引:3
本文提出了一种六端口测量介电常数的校准方法,该方法将六端口和开口同轴线两次校准合为一次,特别适合于介电系数的在线测量。 相似文献
2.
本文利用波的叠加原理,把已知的单六端口反射仪的四标准校准法应用到双六端口网络分析仪上,提出了双六端口网络分析仪校准与测量的一种新技术。 相似文献
3.
4.
直通-反射-延迟线(TRL)校准相对于短路-开路-负载-直通(SOLT)校准是一种更加准确且易于实现的校准方法,尤其适用于二端口及多端口的非同轴测量。文中针对Wolfspeed公司的氮化镓晶体管CGH40010F的S参数测量问题,分析讨论了TRL校准在网络分析仪中的误差盒模型,在此基础上设计制作了一套TRL校准件,其工作频率范围为1~6 GHz,在此频段内直通和延迟线均达到Sii(i=1,2)幅值小于-15 dB,Sij(i,j=1,2;i≠j)幅值大于-0.8 dB;将该校准件特性指标内置到矢量网络分析仪中进行校准测试,实测结果表明,经过TRL校准后的氮化镓晶体管小信号S参数与官方数据手册中一致,验证了该校准测量方法及据此设计制作的TRL校准件是有效的。 相似文献
5.
文章简单介绍校准件端口尺寸的测量方法,主要分析了影响其测量不确定度的各个因素,并对引入的测量不确定度的各分量进行评定,给出完整的端口尺寸的测量结果。 相似文献
6.
TRL校准方法是矢量网络分析仪(Vector Network Analyzer,VNA)校准的常用方法之一,它通过对直通件、反射件和传输线3个标准件的测量,经过一系列计算获取各误差项的值。但是在实际测量中,这些校准件并不能在整个频带范围内具有理想的特性,从而在实际测量时会引起被测件S参数的测量不确定度。对于使用日益广泛的多端口VNA而言,测量不确定度的分析比二端口VNA更为复杂,目前对其开展的研究还不够广泛深入。文章以四端口VNA为例,对TRL校准过程中由非理想标准件引起的被测件的S参数测量不确定度进行研究。首先,运用广义节点的思想将四端口VNA的S参数测量不确定度用矩阵形式表示,再运用广义TRL校准方法,求得各误差项及其偏移的值,最终求得灵敏度系数的解析式,它可以对四端口VNA进行S参数测量不确定度的B类评估。 相似文献
7.
在采用光调制法测量光探测器芯片高频响应特性的过程中,测试系统往往忽视光调制器响应、高频探针衰减以及端口间失配等误差中的一项或几项.为了降低校准不完善对结果造成的误差,文中提出了基于信号流图的系统校准分析方法,考虑了各种频响误差及端口间失配的影响,推导出校准公式.利用该法对一种光探测器的典型测试系统--基于LCA(lightwave component analyzer)的测试系统做了进一步校准分析,在130MHz~20GHz范围内,测量了一种新型光探测器的高频响应参数S21,结果表明经流图法校准的S21参数比仅使用原有校准算法有明显改善,证明了该方法的可行性. 相似文献
8.
9.
10.
在采用光调制法测量光探测器芯片高频响应特性的过程中,测试系统往往忽视光调制器响应、高频探针衰减以及端口间失配等误差中的一项或几项.为了降低校准不完善对结果造成的误差,文中提出了基于信号流图的系统校准分析方法,考虑了各种频响误差及端口间失配的影响,推导出校准公式.利用该法对一种光探测器的典型测试系统--基于LCA(lightwave component analyzer)的测试系统做了进一步校准分析,在130MHz~20GHz范围内,测量了一种新型光探测器的高频响应参数S21,结果表明经流图法校准的S21参数比仅使用原有校准算法有明显改善,证明了该方法的可行性. 相似文献
11.
A. I. Chizhov 《Journal of Communications Technology and Electronics》2008,53(5):550-553
A relationship between the elements of the scattering matrix of an asymmetric microwave two-port network and its input and output impedances under open-circuit and short-circuit conditions are determined. Analytic expressions for the elements of the scattering matrix of reciprocal passive linear microwave two-port networks of various kinds—asymmetric, antisymmetric, and symmetric—have been obtained. A theorem of necessary and sufficient matching conditions for these two-port networks is formulated. 相似文献
12.
《Microwave Theory and Techniques》1986,34(7):840-841
Equations are presented for computing the unloaded Q factor of a microwave resonator embedded in an impedance-transforming lossIess, reciprocal two-port. Knowledge of the transformation properties of the two-port is not required. 相似文献
13.
A generalized multiport network analyzer implemented using commercially available hardware is presented. Measurement calibration is accomplished through a novel calibration procedure which requires only conventional standards used for two-port calibrations. The calibration theory accounts for the errors due to the signal switching network but does not systematically remove errors due to signal switching leakage between port pairs. The approach is verified on a three-port test set implementation, and the measuring system can be expanded to n ports with additional hardware in a straightforward manner. Experimental verification was carried out through measurement of one-, two-, and three-port devices connected to the test set ports in several different ways. Excellent agreement of the same corrected S -parameters measured at different test set ports was observed, and confidence in system accuracy is established through measurement of two-port verification standards 相似文献
14.
15.
《Microwave Theory and Techniques》1978,26(9):639-642
The least-squares fit of measured noise figures as a function of source admittance is an accurate and rapid method also convenient from the experimental point of view, to determine linear two-port noise parameters. However, to avoid the erroneous results often obtained by experimenters, this paper presents some criteria to be followed in choosing the proper source admittances. In order to apply the method to microwave two-ports, a relationship relating noise parameters in a linearized form is introduced. The analytical developments are in terms of effective input noise temperature of the two-port. Experimental. results for a microwave transistor are also reported as a function of experimental redundancy. 相似文献
16.
A method for simultaneously measuring the magnitude and phase of the harmonics generated by a microwave two-port is reported. The two-port under test is driven with a sinusoidal microwave signal strong enough to force it into nonlinear operation. Its output harmonics are measured in the frequency domain with a setup that includes a vector network analyzer. For phase calibration at the harmonic frequencies, a millimeter-wave Schottky diode is used as a reference device. The system allows the measurement of harmonics with a phase accuracy of about ±10° at 20 GHz (referred to f 1=5 GHz). It can be built for any frequency (<40 GHz) at which a vector network analyzer and a suitable signal generator with multiplier are available. For low-amplitude harmonics, higher sensitivity compared to time-domain measurements with a sampling scope results in better measurement accuracy. The accuracy should improve further if the nonideality of the diode reference circuit is characterized more precisely 相似文献
17.
A rigorous mathematical treatment of microwave network analyzer calibration and de-embedding procedures for the two-port error network representation is used in order to explain current calibration techniques in a succinct and homogeneous manner. It is demonstrated that the essence of through-delay de-embedding techniques consists in the use of two known two-port calibration standards to obtain pairs of similar matrices for the input and output error adapters. Once the characteristic vectors for these matrices are obtained, a number of different approaches can be used in order to solve for the scaling constants 相似文献
18.
《Solid-State Circuits, IEEE Journal of》1968,3(3):246-250
By coupling to the magnetoelastic spin-wave mode in YIG crystals with microwave acoustic transducers, dispersive two-port components can be realized. Preliminary characteristics of such a device employing a CdS shear transducer are reported in the UHF range. Elastic coupling losses, spin-wave limiting characteristics, dynamic range, and delay dispersion linearity of YIG devices are discussed for microwave pulse compression applications. 相似文献
19.
《Microwave Theory and Techniques》1975,23(10):849-850
Least pth optimization of reflection coefficients and/or transducer gain of two-port microwave networks. 相似文献
20.
This paper describes the fundamental properties of two orthogonal resonant modes within stripline ring resonators and their application to microwave devices. There are two principal methods for application of ring resonators, the first is by using two-port devices and the second four-port devices, in the case of two-port configurations, dual-mode filters using coupling between two degenerate modes have been studied as typical applications. In this paper, new methods for the coupling of two modes and their applications to practical devices, are proposed, and then experimental results for proof of the new structures are presented. Four-port configurations, which make use of two resonant modes as being independent or having no coupling between them, have a wider range of application to microwave devices. Microwave circuits such as tuned amplifiers and oscillators with novel structures are proposed, and their excellent characteristics are demonstrated. The experimental results obtained in this study on two and four-port devices make it clear that dual-mode ring resonators have great potential for application to various microwave devices 相似文献