2019 Antenna Measurement Techniques Association Symposium (AMTA)最新文献_第2页

Validation of Electromagnetic Compatibility Chambers with a Spherical Wave Expansion Approach 用球面波展开法验证电磁兼容室

2019 Antenna Measurement Techniques Association Symposium (AMTA) Pub Date : 2019-10-01 DOI: 10.23919/AMTAP.2019.8906406

C. Culotta-López, Zhong Chen, T. M. Gemmer, D. Heberling

{"title":"Validation of Electromagnetic Compatibility Chambers with a Spherical Wave Expansion Approach","authors":"C. Culotta-López, Zhong Chen, T. M. Gemmer, D. Heberling","doi":"10.23919/AMTAP.2019.8906406","DOIUrl":"https://doi.org/10.23919/AMTAP.2019.8906406","url":null,"abstract":"Electromagnetic Compatibility (EMC) radiated emissions measurements above 1 GHz are performed in a nominal free space environment as required by international standards, typically in an anechoic chamber. In an EMC chamber, the test zone consists of a circular region defined by a turn table, where an equipment under test is rotated and measured. The test zone is commonly referred to as quiet zone (QZ). Due to the non-ideal nature of absorbers, multiple reflections in the chamber affect the quality of the QZ. The constructive and destructive interferences from the reflections form standing waves in the QZ. The maximum value of the standing wave is used as the figure of merit for validation of testing facilities. Site Voltage Standing Wave Ratio (sVSWR) as specified in CISPR 16-1-4 is broadly used for the validation of test sites above 1 GHz. This method requires the measurement of six positions along a linear 40 cm transmission path at various locations in the QZ, with a frequency step of no greater than 50 MHz using an omnidirectional-like antenna (e.g. a dipole). Concerns have been raised that this method delivers an overly optimistic result due to both spatial and frequency domain undersampling. In this work, an alternative method to sVSWR for the validation of EMC chambers based on Spherical Mode Coefficients (SMC) is proposed. Two 90°-rotated measurement cuts of an omnidirectional-like antenna are acquired around the periphery of the circular QZ. The measured situation and cut is replicated by applying translation and rotation of spherical waves to the known SMCs of the used omnidirectional-like antenna and transforming using the spherical wave expansion. The generated and measured cut are compared and the characteristics of the chamber are extracted. The major advantage of this method is the relatively high measurement speed and reliability.","PeriodicalId":339768,"journal":{"name":"2019 Antenna Measurement Techniques Association Symposium (AMTA)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124364575","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Measurement of RF Absorber at Large Angles of Incidence using Spectral Domain Transformations 用谱域变换测量大入射角射频吸收器

2019 Antenna Measurement Techniques Association Symposium (AMTA) Pub Date : 2019-10-01 DOI: 10.23919/AMTAP.2019.8906360

V. Rodriguez, B. Walkenhorst, Jorgen Bruun

{"title":"Measurement of RF Absorber at Large Angles of Incidence using Spectral Domain Transformations","authors":"V. Rodriguez, B. Walkenhorst, Jorgen Bruun","doi":"10.23919/AMTAP.2019.8906360","DOIUrl":"https://doi.org/10.23919/AMTAP.2019.8906360","url":null,"abstract":"Pyramidal RF absorber, widely used in indoor antenna ranges, is designed to minimize reflectivity by creating an impedance transform from free space to the impedance of the absorber material. The pyramidal shape provides this transition quite well at normal incidence. It has been shown in [1] that pyramidal RF absorber performs very well up to angles of incidence of about 45 degrees off-normal, but at wider angles of incidence, the performance degrades significantly. Unfortunately, it is very difficult to perform RF absorber measurements at large oblique incidence angles. In such measurements, the reflected path and the direct path between the antennas are very close in length, making it difficult to use time-domain gating techniques to eliminate the direct coupling.In this paper, a novel approach for performing oblique RF absorber measurements is introduced based on spectral domain transformations. Preliminary measurements using this technique have been compared to RF simulations. Results appear to indicate that this approach is a valid way to perform RF absorber reflectivity measurements at highly oblique incidence angles.","PeriodicalId":339768,"journal":{"name":"2019 Antenna Measurement Techniques Association Symposium (AMTA)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117035989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Comparative Investigation of Spatial Filtering Techniques for Ground Plane Removal in PEC-Based Automotive Measurements 基于pec的汽车测量中地平面去除空间滤波技术的比较研究

2019 Antenna Measurement Techniques Association Symposium (AMTA) Pub Date : 2019-10-01 DOI: 10.23919/AMTAP.2019.8906476

F. Saccardi, F. Mioc, L. Foged, J. Estrada, P. Iversen, M. Edgerton, J. Graham

{"title":"Comparative Investigation of Spatial Filtering Techniques for Ground Plane Removal in PEC-Based Automotive Measurements","authors":"F. Saccardi, F. Mioc, L. Foged, J. Estrada, P. Iversen, M. Edgerton, J. Graham","doi":"10.23919/AMTAP.2019.8906476","DOIUrl":"https://doi.org/10.23919/AMTAP.2019.8906476","url":null,"abstract":"Radiating performances of vehicle-installed antennas are typically performed in large spherical near-field systems able to accommodate the entire car. Due to the size and weight of the vehicle to be tested, such spherical systems are often nearly hemispherical, and the floor is conductive or covered with absorbers. The main advantage of the first is the ease of the accommodation of the vehicle under test. Conversely, the latter is more time consuming in the setup of the measurements because the absorbers need to be moved in order to be placed around the vehicle. On the other hand, the absorber-covered floors emulate a free-space environment which is a key enabling factor in performing accurate measurements at low frequencies (down to 70 MHz). Moreover, the availability of the free-space response allows easy emulation of the cars’ behaviors over realistic automotive environments (e.g. roads, urban areas etc.) with commercially available tools. Such emulations are instead much more challenging when a conductive floor is considered. Furthermore, the raw measurements over conductive floors are a good approximation of realistic grounds (such as asphalts) only in a limited number of situations. For these reasons, when PEC-based automotive measurements are performed, it is often required to retrieve the free-space response, or equivalently, to remove the effect of the conductive ground.In this paper two spatial-filtering techniques (the spherical modal filtering and the equivalent currents) will be experimentally analyzed and compared to verify their effectiveness in removing the effect of the conductive floor. For this purpose, a scaled automotive PEC-based measurement setup has been implemented considering a small spherical multi-probe system and a 1:12 scaled car model. The two techniques will be analyzed considering two different heights of the scaled car model with respect to the conductive floor.","PeriodicalId":339768,"journal":{"name":"2019 Antenna Measurement Techniques Association Symposium (AMTA)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131084647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

A Simple High-Perfomance P-Band First-Order Dual-Port Probe for Spherical Near-Field Antenna Measurements based on the Shorted Annular Patch Antenna 一种基于短环形贴片天线的球面近场天线测量用p波段一阶双端口探针

2019 Antenna Measurement Techniques Association Symposium (AMTA) Pub Date : 2019-10-01 DOI: 10.23919/AMTAP.2019.8906390

M. Brandt-Møller, M. Fröhner, O. Breinbjerg

引用次数: 0

Testing mmWave Phased Arrays for the 5G New Radio 5G新无线电毫米波相控阵测试

2019 Antenna Measurement Techniques Association Symposium (AMTA) Pub Date : 2019-10-01 DOI: 10.23919/AMTAP.2019.8906488

M. Foegelle

引用次数: 0

GSS (Gated-Short-Short) Calibration for Free-space Material Measurements in millimeter-Wave Frequency Band 毫米波频段自由空间材料测量的GSS (gate - short - short)校准

2019 Antenna Measurement Techniques Association Symposium (AMTA) Pub Date : 2019-10-01 DOI: 10.23919/AMTAP.2019.8906376

Jin-Seob Kang, Jeong-Hwan Kim

引用次数: 1

3D Printed Magneto-Electric Phased Array Antenna for Various 5G New Radio Bands 用于各种5G新无线电频段的3D打印磁电相控阵天线

2019 Antenna Measurement Techniques Association Symposium (AMTA) Pub Date : 2019-10-01 DOI: 10.23919/AMTAP.2019.8906472

Connor Laffey, P. Nguyen, Ghanshyam Mishra, S. Sharma

引用次数: 0

Small Antenna Testing in a Compact Antenna Test Range 小型天线测试范围内的小型天线测试

2019 Antenna Measurement Techniques Association Symposium (AMTA) Pub Date : 2019-10-01 DOI: 10.23919/AMTAP.2019.8906487

S. Gregson, C. Parini, S. Pivnenko

引用次数: 3

Impact of Phase Curvature on Measuring 5G Millimeter Wave Devices 相位曲率对5G毫米波设备测量的影响

2019 Antenna Measurement Techniques Association Symposium (AMTA) Pub Date : 2019-10-01 DOI: 10.23919/AMTAP.2019.8906462

A. Scannavini, F. Saccardi, L. Foged, K. Zhao

{"title":"Impact of Phase Curvature on Measuring 5G Millimeter Wave Devices","authors":"A. Scannavini, F. Saccardi, L. Foged, K. Zhao","doi":"10.23919/AMTAP.2019.8906462","DOIUrl":"https://doi.org/10.23919/AMTAP.2019.8906462","url":null,"abstract":"Wireless industry through 3GPP has standardized 5G in both FR1 (sub 6 GHz) and FR2 (24.25–52.6 GHz) frequency ranges. While FR1 will be using frequencies already in place for LTE-4G technology, FR2 is dealing with mmWave frequencies. Due to the high free space path loss (FSPL), 5G at mmWave would impose the use of directive antennas on both ends of the communication link, the User Equipment (UE) and the Base Station (BS). A black box approach (i.e. the location of the antenna within the device is unknown) has been agreed to be used for Over The Air (OTA) measurements. The physical center of the device must be aligned with the center of the measurement setup. Hence, the test antennas will likely be offset with respect to the center of the coordinate system. The measurement distance will be for most systems sufficient to minimize the amplitude error while will introduce a phase deviation between the actual spherical wave and the desired plane wave which may cause an effective phase shaping of the radiated beam of the small phased array under test. In this paper we will analyze the impact of the phase curvature on the beam antenna pattern and spherical coverage for the different testing environments. Specifically, simulation of a 5G terminal device with multiple beams will be considered and realistic spherical near field measurement at different finite distances will be emulated also taking into account different measurement antennas (probes).","PeriodicalId":339768,"journal":{"name":"2019 Antenna Measurement Techniques Association Symposium (AMTA)","volume":"107 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116503247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Element Failure Detection of Array Antenna using Near-field Measurement with Shallow Neural Network 基于浅神经网络近场测量的阵列天线元件失效检测

2019 Antenna Measurement Techniques Association Symposium (AMTA) Pub Date : 2019-10-01 DOI: 10.23919/AMTAP.2019.8906457

M. Ameya, S. Kurokawa

引用次数: 1