Pub Date : 2006-07-09DOI: 10.1109/APS.2006.1711419
Z. Zhang, J. Bernhard
A new technique to increase the operating bandwidth of a two-arm Archimedean spiral antenna is presented in this paper. Unlike other conventional solutions, including absorbent cavity backing and resistive loading, this method incorporates the concept of low-pass filtering with the two-wire transmission line behavior of the spiral antenna. The reactive loading from the integrated low-pass filter design improves the impedance match at lower frequencies providing a greater bandwidth than the basic spiral design
{"title":"Two-Arm Archimedean Spiral with Filter-Based Reactive Loading","authors":"Z. Zhang, J. Bernhard","doi":"10.1109/APS.2006.1711419","DOIUrl":"https://doi.org/10.1109/APS.2006.1711419","url":null,"abstract":"A new technique to increase the operating bandwidth of a two-arm Archimedean spiral antenna is presented in this paper. Unlike other conventional solutions, including absorbent cavity backing and resistive loading, this method incorporates the concept of low-pass filtering with the two-wire transmission line behavior of the spiral antenna. The reactive loading from the integrated low-pass filter design improves the impedance match at lower frequencies providing a greater bandwidth than the basic spiral design","PeriodicalId":6423,"journal":{"name":"2006 IEEE Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2006-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78238270","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}
Pub Date : 2006-07-09DOI: 10.1109/APS.2006.1711675
Wen‐Shan Chen, Mao-Kai Hsu, Kai-Nan Yang, Hsin-Cheng Su, Hua‐Ming Chen
The cross semi-elliptic monopole antenna and band-rejected cross semi-elliptic monopole antenna with finite ground plane have been implemented and investigated, respectively. Experimental results show that the obtained impedance bandwidths of the two designs of antenna fit the requirement of the UWB applications. The dipole-like radiation patterns over the operating bandwidth are also shown in this paper. In addition, the proposed antenna also shows a compact size, compared to a corresponding elliptic monopole antenna. The proposed design of this antenna with finite ground is suitable for practical UWB applications
{"title":"The Design of the cross semi-elliptic disc monopole antenna and the band-rejected cross semi-elliptic monopole antenna for UWB Applications","authors":"Wen‐Shan Chen, Mao-Kai Hsu, Kai-Nan Yang, Hsin-Cheng Su, Hua‐Ming Chen","doi":"10.1109/APS.2006.1711675","DOIUrl":"https://doi.org/10.1109/APS.2006.1711675","url":null,"abstract":"The cross semi-elliptic monopole antenna and band-rejected cross semi-elliptic monopole antenna with finite ground plane have been implemented and investigated, respectively. Experimental results show that the obtained impedance bandwidths of the two designs of antenna fit the requirement of the UWB applications. The dipole-like radiation patterns over the operating bandwidth are also shown in this paper. In addition, the proposed antenna also shows a compact size, compared to a corresponding elliptic monopole antenna. The proposed design of this antenna with finite ground is suitable for practical UWB applications","PeriodicalId":6423,"journal":{"name":"2006 IEEE Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2006-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78449218","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}
Pub Date : 2006-07-09DOI: 10.1109/APS.2006.1710677
S. D. Keller, W. Palmer, W. Joines
In this paper, a symmetrical 1.5 GHz patch antenna has been designed, constructed, simulated and experimentally fine-tuned to be the radiating element in the experiment to implement direct antenna modulation. With a resonant bandwidth of about 30 MHz (using a 10 dB or better return-loss standard), there is significant room for improvement that direct antenna modulation can offer to the information bandwidth of the system. By driving the antenna at resonance and directly modulating it with an integrated Schottky diode being biased by an external pulse train, the frequency of this external modulating signal is predicted to far exceed the resonant bandwidth of the antenna and still produce a clear demodulated waveform at the receiving end of a basic communication system
{"title":"Direct antenna modulation: analysis, design, and experiment","authors":"S. D. Keller, W. Palmer, W. Joines","doi":"10.1109/APS.2006.1710677","DOIUrl":"https://doi.org/10.1109/APS.2006.1710677","url":null,"abstract":"In this paper, a symmetrical 1.5 GHz patch antenna has been designed, constructed, simulated and experimentally fine-tuned to be the radiating element in the experiment to implement direct antenna modulation. With a resonant bandwidth of about 30 MHz (using a 10 dB or better return-loss standard), there is significant room for improvement that direct antenna modulation can offer to the information bandwidth of the system. By driving the antenna at resonance and directly modulating it with an integrated Schottky diode being biased by an external pulse train, the frequency of this external modulating signal is predicted to far exceed the resonant bandwidth of the antenna and still produce a clear demodulated waveform at the receiving end of a basic communication system","PeriodicalId":6423,"journal":{"name":"2006 IEEE Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2006-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75899126","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}
Pub Date : 2006-07-09DOI: 10.1109/APS.2006.1710856
T. Q. Ho, L. Hunt, C. A. Hewett, R. Mittra, Wenhua Yu, T.G. Ready, D.A. Zolnick, M. Kragalott
To validate the CFDTD code, analysis was first carried out on a smaller array with 64 elements. The structure was built up with elements identical to those used in the 10,000-element array. Models of the validation array were constructed using both CFDTD and XFDTD. The array radiation patterns were shown for 0deg, 30deg, 45deg, and 60deg scan angles at the center frequency of 1.75 GHz. The beam was scanned in the Phi = 90deg plane. The solid lines represent CFDTD data while the dotted lines indicate the corresponding XFDTD set. As the beam is steered away from boresight, the 3-dB beamwidth increases from 12.9deg at boresight to 26.2deg at the 60deg scan angle. The first sidelobe level is about 13 dB below the peak when the main beam is pointed at boresight. The total change in peak sidelobe level is 4.0 dB as the beam is scanned from boresight to 60deg. The array directivity calculated with CFDTD is 23.0 dB, which is within 0.2 dB of the value given by XFDTD. Furthermore, the scan loss from 0deg to 60deg is observed to be 3.0 dB with CFDTD and 2.8 dB with XFDTD. These values are consistent with expectations for a well behaved array with 0.5lambda element spacing
{"title":"Analysis of electrically large patch phased arrays via CFDTD","authors":"T. Q. Ho, L. Hunt, C. A. Hewett, R. Mittra, Wenhua Yu, T.G. Ready, D.A. Zolnick, M. Kragalott","doi":"10.1109/APS.2006.1710856","DOIUrl":"https://doi.org/10.1109/APS.2006.1710856","url":null,"abstract":"To validate the CFDTD code, analysis was first carried out on a smaller array with 64 elements. The structure was built up with elements identical to those used in the 10,000-element array. Models of the validation array were constructed using both CFDTD and XFDTD. The array radiation patterns were shown for 0deg, 30deg, 45deg, and 60deg scan angles at the center frequency of 1.75 GHz. The beam was scanned in the Phi = 90deg plane. The solid lines represent CFDTD data while the dotted lines indicate the corresponding XFDTD set. As the beam is steered away from boresight, the 3-dB beamwidth increases from 12.9deg at boresight to 26.2deg at the 60deg scan angle. The first sidelobe level is about 13 dB below the peak when the main beam is pointed at boresight. The total change in peak sidelobe level is 4.0 dB as the beam is scanned from boresight to 60deg. The array directivity calculated with CFDTD is 23.0 dB, which is within 0.2 dB of the value given by XFDTD. Furthermore, the scan loss from 0deg to 60deg is observed to be 3.0 dB with CFDTD and 2.8 dB with XFDTD. These values are consistent with expectations for a well behaved array with 0.5lambda element spacing","PeriodicalId":6423,"journal":{"name":"2006 IEEE Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2006-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72735056","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}
Pub Date : 2006-07-09DOI: 10.1109/APS.2006.1710860
T. Hirano, Atsuhiro Nishikata, J. Hirokawa, M. Ando
In this paper, a new algorithm to obtain S-parameters using the FDTD for a multi-mode waveguide is presented. In the proposed method, the complex electric field expression is calculated in different two virtual planes, and weighting coefficients for incident and reflected waves can be obtained by solving two equations corresponding to the two virtual planes together with modal decomposition. As an example of the analysis, the vacuum window of a unit-cell for a slotted waveguide array for plasma excitation is analyzed. The frequency characteristic of reflection coefficients calculated by the FDTD method agrees well with that by the generalized scattering matrix (GSM)-method of moments (MoM) hybridization analysis
{"title":"FDTD analysis of S-parameters for a multi-mode waveguide with CW excitation","authors":"T. Hirano, Atsuhiro Nishikata, J. Hirokawa, M. Ando","doi":"10.1109/APS.2006.1710860","DOIUrl":"https://doi.org/10.1109/APS.2006.1710860","url":null,"abstract":"In this paper, a new algorithm to obtain S-parameters using the FDTD for a multi-mode waveguide is presented. In the proposed method, the complex electric field expression is calculated in different two virtual planes, and weighting coefficients for incident and reflected waves can be obtained by solving two equations corresponding to the two virtual planes together with modal decomposition. As an example of the analysis, the vacuum window of a unit-cell for a slotted waveguide array for plasma excitation is analyzed. The frequency characteristic of reflection coefficients calculated by the FDTD method agrees well with that by the generalized scattering matrix (GSM)-method of moments (MoM) hybridization analysis","PeriodicalId":6423,"journal":{"name":"2006 IEEE Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2006-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74947938","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}
Pub Date : 2006-07-09DOI: 10.1109/APS.2006.1711202
Abdullah Eroglu, Jay Kyoon Lee
A novel and practical method to obtain the complete set of the dyadic Green's functions for general anisotropic media is presented. The method is based on the k-domain representation of the fields in terms of wave matrices. The Fourier transformed Green's functions are obtained through inverses of wave matrices, which lead to the final form of the dyadic Green's functions. It is shown that the knowledge of the inverse of one type of wave matrix is sufficient to find the complete set of the dyadic Green's functions for a general anisotropic medium
{"title":"Representation of dyadic Green's functions for general anisotropic media","authors":"Abdullah Eroglu, Jay Kyoon Lee","doi":"10.1109/APS.2006.1711202","DOIUrl":"https://doi.org/10.1109/APS.2006.1711202","url":null,"abstract":"A novel and practical method to obtain the complete set of the dyadic Green's functions for general anisotropic media is presented. The method is based on the k-domain representation of the fields in terms of wave matrices. The Fourier transformed Green's functions are obtained through inverses of wave matrices, which lead to the final form of the dyadic Green's functions. It is shown that the knowledge of the inverse of one type of wave matrix is sufficient to find the complete set of the dyadic Green's functions for a general anisotropic medium","PeriodicalId":6423,"journal":{"name":"2006 IEEE Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2006-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77353245","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}
Pub Date : 2006-07-09DOI: 10.1109/APS.2006.1711198
D.X. Wang, E. Yung, R. Chen
This paper presents a coupled surface integral equation (CSIE) solution of electromagnetic scattering by chirally coated conducting bodies with arbitrary shape. The equivalence theorem combined with the field splitting scheme is used to formulate the fields within chiral media in terms of two sets of equivalent electric and magnetic surface currents. The boundary condition is enforced on the interface between conducting bodies and chiral media. A system of coupled matrix equations are then obtained and numerically solved using the method of moments. The calculated data for a conducting sphere coated with chiral material is compared with the exact solution and excellent agreements are observed
{"title":"A coupled integral equation solution of chirally coated conducting bodies","authors":"D.X. Wang, E. Yung, R. Chen","doi":"10.1109/APS.2006.1711198","DOIUrl":"https://doi.org/10.1109/APS.2006.1711198","url":null,"abstract":"This paper presents a coupled surface integral equation (CSIE) solution of electromagnetic scattering by chirally coated conducting bodies with arbitrary shape. The equivalence theorem combined with the field splitting scheme is used to formulate the fields within chiral media in terms of two sets of equivalent electric and magnetic surface currents. The boundary condition is enforced on the interface between conducting bodies and chiral media. A system of coupled matrix equations are then obtained and numerically solved using the method of moments. The calculated data for a conducting sphere coated with chiral material is compared with the exact solution and excellent agreements are observed","PeriodicalId":6423,"journal":{"name":"2006 IEEE Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2006-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77398889","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}
Pub Date : 2006-07-09DOI: 10.1109/APS.2006.1711599
P. Minard, J. Pintos, A. Louzir
A built-in antenna for a USB key like digital terrestrial TV receiver allowing free to air reception of digital terrestrial TV on a computer PC has been designed, realized and tested. The housing of the compact receiver is used as part of the antenna. The antenna design is optimized so that it covers the whole UHF frequency bandwidth with good radiation efficiency, while its size is imposed by the USB-key form factor. The obtained results are compliant with simulations
{"title":"Integrated broadband antenna for USB digital Terrestrial TV receiver","authors":"P. Minard, J. Pintos, A. Louzir","doi":"10.1109/APS.2006.1711599","DOIUrl":"https://doi.org/10.1109/APS.2006.1711599","url":null,"abstract":"A built-in antenna for a USB key like digital terrestrial TV receiver allowing free to air reception of digital terrestrial TV on a computer PC has been designed, realized and tested. The housing of the compact receiver is used as part of the antenna. The antenna design is optimized so that it covers the whole UHF frequency bandwidth with good radiation efficiency, while its size is imposed by the USB-key form factor. The obtained results are compliant with simulations","PeriodicalId":6423,"journal":{"name":"2006 IEEE Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2006-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77434050","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}
Pub Date : 2006-07-09DOI: 10.1109/APS.2006.1711042
G. Kiziltas
In this paper we presented the design of a compact SATCOM antenna with pre-specified bandwidth requirements. We demonstrated that a novel design procedure accompanied by filtering and post processing techniques is capable of designing novel material composites with tremendous performance improvement for broadband antennas. The proposed design procedure was based on the integration of full wave finite element analysis (FEA) and topology design method employing sequential linear programming (SLP). A simple yet effective dry powder compacting method - "sand painting" was invented that is capable of producing multi-layer multi-ceramic variations in 3D. This fabrication technique is specifically invented to produce the resulting volumetric multimaterial variation using off-the-shelf powders and can be extended to allow for magnetic and conductor inclusions as discussed at the conference
{"title":"Design and Fabrication of Three Dimensional Dielectric and Magnetic Composites for Satcom Antenna Applications","authors":"G. Kiziltas","doi":"10.1109/APS.2006.1711042","DOIUrl":"https://doi.org/10.1109/APS.2006.1711042","url":null,"abstract":"In this paper we presented the design of a compact SATCOM antenna with pre-specified bandwidth requirements. We demonstrated that a novel design procedure accompanied by filtering and post processing techniques is capable of designing novel material composites with tremendous performance improvement for broadband antennas. The proposed design procedure was based on the integration of full wave finite element analysis (FEA) and topology design method employing sequential linear programming (SLP). A simple yet effective dry powder compacting method - \"sand painting\" was invented that is capable of producing multi-layer multi-ceramic variations in 3D. This fabrication technique is specifically invented to produce the resulting volumetric multimaterial variation using off-the-shelf powders and can be extended to allow for magnetic and conductor inclusions as discussed at the conference","PeriodicalId":6423,"journal":{"name":"2006 IEEE Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2006-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77488213","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}
Pub Date : 2006-07-09DOI: 10.1109/APS.2006.1711431
J. McVay, A. Hoorfar
In this paper, the characteristics of utilizing planar metallic paths in the form of Peano and Hilbert space-filling curves (SFC) are investigated to provide top-loading properties to electrically short monopole antenna elements. Because the higher order SFC curve paths are resonant at frequencies for which the area that encloses the curve can be considered as electrically small, these curves may offer resonant loading characteristics in compact, low-profile and potentially conformal antenna designs, with monopole-like radiation patterns
{"title":"A Miniaturized Planar Space-filling Curve Antenna with Wideband Monopole-like Radiation Characteristics","authors":"J. McVay, A. Hoorfar","doi":"10.1109/APS.2006.1711431","DOIUrl":"https://doi.org/10.1109/APS.2006.1711431","url":null,"abstract":"In this paper, the characteristics of utilizing planar metallic paths in the form of Peano and Hilbert space-filling curves (SFC) are investigated to provide top-loading properties to electrically short monopole antenna elements. Because the higher order SFC curve paths are resonant at frequencies for which the area that encloses the curve can be considered as electrically small, these curves may offer resonant loading characteristics in compact, low-profile and potentially conformal antenna designs, with monopole-like radiation patterns","PeriodicalId":6423,"journal":{"name":"2006 IEEE Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2006-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77573373","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}
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