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Emerging array antenna technologies at JPL 喷气推进实验室新兴阵列天线技术
1998 Symposium on Antenna Technology and Applied Electromagnetics Pub Date : 1998-08-09 DOI: 10.1109/ANTEM.1998.7861721
John Huang
{"title":"Emerging array antenna technologies at JPL","authors":"John Huang","doi":"10.1109/ANTEM.1998.7861721","DOIUrl":"https://doi.org/10.1109/ANTEM.1998.7861721","url":null,"abstract":"JPL/NASA's Earth remote sensing and deep-space exploration programs have been placing emphasis on their spacecraft's high-gain and large-aperture antennas. At the same time, however, low mass and small stowage volume are demanded in order to reduce payload weight and reduce shroud size and thus reduce launch cost. To meet these goals, the concept of an inflatable parabolic reflector was introduced about two decades ago. However, the full implementation of this concept is still hampered by the inability to achieve the required surface accuracy. Even with the technologies of rigidizable membrane, stretchable aluminum, UV-cured polymer, and hardenable gel, it is believed that it will be difficult to maintain the desired parabolic surface accuracy for the duration of long space missions To mitigate the effect of curvature, a new class of planar array technology is being developed. It is believed that it will be significantly easier to maintain the required surface tolerance of a flat structure, such as the planar array, than a curved structure such as a parabola. In addition, a planar array offers the possibility of wide-angle beam scanning which cannot be easily achieved by a parabolic reflector. At JPL, three planar array antenna technologies are being developed. These are microstrip reflectarray[1,2,3], inflatable planar array[4,5], and foldable frame-supported thin-membrane array[4]. They are separately discussed in the following paragraphs.","PeriodicalId":334204,"journal":{"name":"1998 Symposium on Antenna Technology and Applied Electromagnetics","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133571739","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: 4
Design aspects of the microstrip reflectarray 微带反射镜的设计
1998 Symposium on Antenna Technology and Applied Electromagnetics Pub Date : 1998-08-09 DOI: 10.1109/ANTEM.1998.7861720
John Huang
{"title":"Design aspects of the microstrip reflectarray","authors":"John Huang","doi":"10.1109/ANTEM.1998.7861720","DOIUrl":"https://doi.org/10.1109/ANTEM.1998.7861720","url":null,"abstract":"The Microstrip reflectarray has been identified as one of the enabling technologies to achieve low mass, conformal mounting, wide-angle beam scanning, etc. [1] for NASA's future spaceborne high-gain antennas. It combines some of the best features of microstrip array antenna technology and the traditional parabolic reflector. Recently, the reflectarray antenna has found another horizon. It has the ability to integrate with the solar array and inflatable structures to achieve better overall system efficiency. There is a variety of types of printed reflectarrays. They are formed by basically using different elements, such as patches with variable phase delay lines [2,3] or variable rotation angles [4] and patches, rings, or dipoles with variable sizes [5,6,7]. These printed reflectarrays, although they are different, can be designed in a same fashion by using the simple conventional array technique [3]. Prior to the actual design, several important characteristics of the reflectarray, such as the element pattern, f/D ratio, bandwidth, feed pattern, etc., must be well understood by the designer in order to achieve a design with adequate efficiency.","PeriodicalId":334204,"journal":{"name":"1998 Symposium on Antenna Technology and Applied Electromagnetics","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132833924","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: 3
Electromagnetic scattering by an object buried in soil 埋在土中的物体的电磁散射
1998 Symposium on Antenna Technology and Applied Electromagnetics Pub Date : 1998-08-01 DOI: 10.1109/ANTEM.1998.7861728
S. Kashyap, A. Louie
{"title":"Electromagnetic scattering by an object buried in soil","authors":"S. Kashyap, A. Louie","doi":"10.1109/ANTEM.1998.7861728","DOIUrl":"https://doi.org/10.1109/ANTEM.1998.7861728","url":null,"abstract":"This paper investigates the scattering of electromagnetic waves by an object buried in soil. We use the finite difference time domain (FDTD) method to compute the scattered electric fields and power density on the soil surface, in the soil around the object, and in the object We consider a dielectric object, a metallic object, as well as a dielectric object with a thin metallic pin. We determine the effect of various parameters including the incident wave frequency, the object depth, the object dielectric properties, and the soil dielectric properties, on the scattered fields at various locations.","PeriodicalId":334204,"journal":{"name":"1998 Symposium on Antenna Technology and Applied Electromagnetics","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116856668","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: 0
Broadband microstrip patch antenna for wireless applications 用于无线应用的宽带微带贴片天线
1998 Symposium on Antenna Technology and Applied Electromagnetics Pub Date : 1998-08-01 DOI: 10.1109/ANTEM.1998.7861694
T. Denidni, M. Hotton
{"title":"Broadband microstrip patch antenna for wireless applications","authors":"T. Denidni, M. Hotton","doi":"10.1109/ANTEM.1998.7861694","DOIUrl":"https://doi.org/10.1109/ANTEM.1998.7861694","url":null,"abstract":"In this paper, broadband patch microstrip antenna is investigated. The goal is to meet the demands on wireless communication systems where there is a substantial need for new antennas, which are light, low profile and low cost. Microstrip patch antenna constitutes a best candidate in this area. However, these antennas are characterized by the limitation of their bandwidth that is of order 1–2%. In wireless system, this band is not enough sufficient for a high rate data transmission. To overcome this problem, a new antenna is presented in this paper.","PeriodicalId":334204,"journal":{"name":"1998 Symposium on Antenna Technology and Applied Electromagnetics","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126929836","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: 1
New method of analyzing the coupling between patches in planar filters 平面滤波器中贴片间耦合分析的新方法
1998 Symposium on Antenna Technology and Applied Electromagnetics Pub Date : 1998-08-01 DOI: 10.1109/ANTEM.1998.7861787
A. Torabian, Y. Chow
{"title":"New method of analyzing the coupling between patches in planar filters","authors":"A. Torabian, Y. Chow","doi":"10.1109/ANTEM.1998.7861787","DOIUrl":"https://doi.org/10.1109/ANTEM.1998.7861787","url":null,"abstract":"To have accurate analysis of filters with more than one patch, we should be able to calculate the coupling between patches. This coupling is usually calculated by numerical method such as moment method, which could be very time consuming and not accurate enough. In this paper, a fast and accurate method is presented to analyze the coupling between patches. As an example, a 4-pole dual mode patch filter is analyze with our new method, and result is verified by other methods.","PeriodicalId":334204,"journal":{"name":"1998 Symposium on Antenna Technology and Applied Electromagnetics","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114415691","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: 0
Resonant circular patch microstrip antenna with air gap 带气隙的谐振圆形贴片微带天线
1998 Symposium on Antenna Technology and Applied Electromagnetics Pub Date : 1998-08-01 DOI: 10.1109/ANTEM.1998.7861712
Ç. Gürel, E. Yazgan
{"title":"Resonant circular patch microstrip antenna with air gap","authors":"Ç. Gürel, E. Yazgan","doi":"10.1109/ANTEM.1998.7861712","DOIUrl":"https://doi.org/10.1109/ANTEM.1998.7861712","url":null,"abstract":"The resonant frequency and bandwidth characteristics of superstrate loaded air gap tuned circular patch microstrip antenna are investigated for different structural parameters. The problem is formulated in spectral domain and Galerkin's method is used for the solution. It is shown that adjustable air gap between the ground plane and substrate compensates superstrate loading effect on the resonant frequency, increases bandwidth and provides tunable operational characteristics.","PeriodicalId":334204,"journal":{"name":"1998 Symposium on Antenna Technology and Applied Electromagnetics","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128363391","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: 0
Models for gap-junction connected cells exposed to low-frequency electric fields 暴露在低频电场下的间隙结连接电池的模型
1998 Symposium on Antenna Technology and Applied Electromagnetics Pub Date : 1998-08-01 DOI: 10.1109/ANTEM.1998.7861701
E. Fear, M. Stuchly
{"title":"Models for gap-junction connected cells exposed to low-frequency electric fields","authors":"E. Fear, M. Stuchly","doi":"10.1109/ANTEM.1998.7861701","DOIUrl":"https://doi.org/10.1109/ANTEM.1998.7861701","url":null,"abstract":"Gap junctions connect many biological cells, providing a form of local intercellular communication which is important for many normal cell processes, such as growth and coordinated tissue responses [1]. Gap junction communication may change in the presence of certain tumour promoters. It has been speculated that this change in communication interferes with the exchange of information important for the regulation of cell growth [2]. Studies have shown that gap junction communication changes when cells are exposed to electromagnetic (EM) fields [3].","PeriodicalId":334204,"journal":{"name":"1998 Symposium on Antenna Technology and Applied Electromagnetics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129049884","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: 0
Effects of inter-feed coupling on the axial ratio performance of circular polarized microstrip antennas 馈源间耦合对圆极化微带天线轴比性能的影响
1998 Symposium on Antenna Technology and Applied Electromagnetics Pub Date : 1998-08-01 DOI: 10.1109/ANTEM.1998.7861724
A. Ittipiboon, A. Petosa, M. Cuhaci
{"title":"Effects of inter-feed coupling on the axial ratio performance of circular polarized microstrip antennas","authors":"A. Ittipiboon, A. Petosa, M. Cuhaci","doi":"10.1109/ANTEM.1998.7861724","DOIUrl":"https://doi.org/10.1109/ANTEM.1998.7861724","url":null,"abstract":"Microstrip antennas are widely used in various applications from L-Band to EHF. Many of these applications, such as mobile satcom, require circular polarized (CP) antennas with wideband performance. The simplest designs for CP microstrip antennas involve a single point feed and a slight perturbation in the antenna structure. This results in a CP antenna with a narrow bandwidth and an average axial ratio (AR) performance. Wider bandwidth can be achieved by using a thicker and lower permittivity substrate with air being the best. Better AR can be obtained by using two point feeds where they are located spatially 90 degrees apart and are excited in phase quadrature with equal amplitude. For these thicker substrate antennas, however, there may be significant amount of coupling between the two feeds which will degrade the AR performance of the CP antennas. This paper will present the investigation of the effects of inter-feed coupling on the AR performance and will examine methods for minimizing the coupling for the optimum CP operation.","PeriodicalId":334204,"journal":{"name":"1998 Symposium on Antenna Technology and Applied Electromagnetics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129357597","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: 6
A rigorous approach for analyzing electro-optic devices on anisotropic uniaxial substrates 一种分析各向异性单轴基板上电光器件的严谨方法
1998 Symposium on Antenna Technology and Applied Electromagnetics Pub Date : 1998-08-01 DOI: 10.1109/ANTEM.1998.7861799
P. Zatta, T. Razban
{"title":"A rigorous approach for analyzing electro-optic devices on anisotropic uniaxial substrates","authors":"P. Zatta, T. Razban","doi":"10.1109/ANTEM.1998.7861799","DOIUrl":"https://doi.org/10.1109/ANTEM.1998.7861799","url":null,"abstract":"The use of electro-optic devices is now of great interest in fiber optic sensors technology [1] as well as in microwave applications such as microstrip antennas design [2]. Therefore, it is clearly essential to investigate rigorous theoretical models for computer simulation tools to narrow down the possible design choices. Simulations can also be very helpful for saving time and providing a better prediction of the electro-optic systems features In this paper, we propose a rigorous approach for addressing these issues.","PeriodicalId":334204,"journal":{"name":"1998 Symposium on Antenna Technology and Applied Electromagnetics","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124735953","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: 0
Patch antenna with U-slot — A design theory u型槽贴片天线- A设计理论
1998 Symposium on Antenna Technology and Applied Electromagnetics Pub Date : 1998-08-01 DOI: 10.1109/ANTEM.1998.7861687
Y. Chow, Z. N. Chen, K. Lee, K. Luk
{"title":"Patch antenna with U-slot — A design theory","authors":"Y. Chow, Z. N. Chen, K. Lee, K. Luk","doi":"10.1109/ANTEM.1998.7861687","DOIUrl":"https://doi.org/10.1109/ANTEM.1998.7861687","url":null,"abstract":"A patch antenna with slot as shown in Fig.1 can have up to 40% band [1], and yet very simple to fabricate. This antenna therefore is highly desirable and yet its design theory is not clear because the detailed mechanism of the U-slot is still unknown. This paper is an attempt to remedy this situation based on a fusing of EM and the filter-circuit theory to identify the importance design parameters and interpret their interactions. Then through an extensive series of hardware experiments the design theory is constructed.","PeriodicalId":334204,"journal":{"name":"1998 Symposium on Antenna Technology and Applied Electromagnetics","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126789626","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: 0
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