Pub Date : 1988-05-25DOI: 10.1109/MWSYM.1988.22049
A. Rong, S. Li
Gap discontinuities in suspended stripline are investigated rigorously using a resonance method together with a variational technique. Full-wave analysis is applied to the equivalent circuit parameters and frequency dispersion effects are taken into account. A set of design charts at Ka-band and W-band are evaluated. Using these results, a Ka-band prototype bandpass filter has been designed and tested to demonstrate the feasibility of the analysis. The measured results agree well with the theoretical predictions.<>
{"title":"Frequency-dependent characteristics of gap discontinuities in suspended striplines for millimeter-wave applications","authors":"A. Rong, S. Li","doi":"10.1109/MWSYM.1988.22049","DOIUrl":"https://doi.org/10.1109/MWSYM.1988.22049","url":null,"abstract":"Gap discontinuities in suspended stripline are investigated rigorously using a resonance method together with a variational technique. Full-wave analysis is applied to the equivalent circuit parameters and frequency dispersion effects are taken into account. A set of design charts at Ka-band and W-band are evaluated. Using these results, a Ka-band prototype bandpass filter has been designed and tested to demonstrate the feasibility of the analysis. The measured results agree well with the theoretical predictions.<<ETX>>","PeriodicalId":339513,"journal":{"name":"1988., IEEE MTT-S International Microwave Symposium Digest","volume":"256 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121346665","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 : 1988-05-25DOI: 10.1109/MWSYM.1988.22206
R. Robertson, R.T. Kihm, E. Holzman, J. Poelker, R. Bowen
The design, configuration, and performance of a W-band transceiver with a volume of 1 in/sup 3/ is discussed. The transceiver uses a noncoherent chirped waveform for a pulse compression radar application. The authors also discuss a design technique for the local oscillator (LO) of the radar, and the successful demonstration of a Gunn diode LO validating this design procedure. The technique of preheat bias control was demonstrated as a method to compensate the chirp response of IMPATT diode transmitters for ambient temperature variations.<>
{"title":"A noncoherent W-band transceiver","authors":"R. Robertson, R.T. Kihm, E. Holzman, J. Poelker, R. Bowen","doi":"10.1109/MWSYM.1988.22206","DOIUrl":"https://doi.org/10.1109/MWSYM.1988.22206","url":null,"abstract":"The design, configuration, and performance of a W-band transceiver with a volume of 1 in/sup 3/ is discussed. The transceiver uses a noncoherent chirped waveform for a pulse compression radar application. The authors also discuss a design technique for the local oscillator (LO) of the radar, and the successful demonstration of a Gunn diode LO validating this design procedure. The technique of preheat bias control was demonstrated as a method to compensate the chirp response of IMPATT diode transmitters for ambient temperature variations.<<ETX>>","PeriodicalId":339513,"journal":{"name":"1988., IEEE MTT-S International Microwave Symposium Digest","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126587711","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 : 1988-05-25DOI: 10.1109/MWSYM.1988.22101
T. Tanaka, K. Tsunoda, M. Aikawa
A slot-coupled directional coupler between two microstrip lines that couples through a rectangular slot in the common ground plane has been proposed and fabricated for the 1.5-GHz band. The design method and the experimental results for this directional coupler are described, as well as its application to a planar multiport directional coupler (MDC). The measured 3-dB coupling results agreed well with the calculated results, as do the experimental results for a four-port MDC. A planar MDC configuration consisting of a combination of slot-coupled directional couplers has also been proposed.<>
{"title":"New slot-coupled directional couplers between double-sided substrate microstrip lines, and their applications","authors":"T. Tanaka, K. Tsunoda, M. Aikawa","doi":"10.1109/MWSYM.1988.22101","DOIUrl":"https://doi.org/10.1109/MWSYM.1988.22101","url":null,"abstract":"A slot-coupled directional coupler between two microstrip lines that couples through a rectangular slot in the common ground plane has been proposed and fabricated for the 1.5-GHz band. The design method and the experimental results for this directional coupler are described, as well as its application to a planar multiport directional coupler (MDC). The measured 3-dB coupling results agreed well with the calculated results, as do the experimental results for a four-port MDC. A planar MDC configuration consisting of a combination of slot-coupled directional couplers has also been proposed.<<ETX>>","PeriodicalId":339513,"journal":{"name":"1988., IEEE MTT-S International Microwave Symposium Digest","volume":"2005 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125808704","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 : 1988-05-25DOI: 10.1109/MWSYM.1988.22100
R. Halladay, A. Pavio, S. Bingham, A. Kikel
A switched preselector, consisting of monolithic bandpass filters, multithrow switches, and broadband amplifiers, has demonstrated excellent selectivity and low loss characteristics in considerably less volume than conventional microstrip designs. The switches use series and shunt FETs in single-pole four-throw (1P4T) and single-pole double-throw (1P2T) configurations, while the filters were designed using semi-lumped-element techniques. A preselector filter bank with postamplification was designed that consisted of four 5-pole Chebyshev bandpass topologies, with center frequencies of 1.5, 2.8, 4.9, and 9.2 GHz, respectively, and bandwidths slightly less than an octave. The LC filter realizations were designed using monolithic parallel plate (MIM) capacitors and high-impedance transmission lines for inductors. Realization of the inductor values was simplified by using tapped inductor techniques simulating an autotransformer, thus enabling the designer to select a variety of transforming ratios. Excellent channel-to-channel isolation, switching speed, and sensitivities, comparable to those of other much larger hybrid approaches, were obtained.<>
{"title":"A monolithic channelized preselector for EW receiver applications","authors":"R. Halladay, A. Pavio, S. Bingham, A. Kikel","doi":"10.1109/MWSYM.1988.22100","DOIUrl":"https://doi.org/10.1109/MWSYM.1988.22100","url":null,"abstract":"A switched preselector, consisting of monolithic bandpass filters, multithrow switches, and broadband amplifiers, has demonstrated excellent selectivity and low loss characteristics in considerably less volume than conventional microstrip designs. The switches use series and shunt FETs in single-pole four-throw (1P4T) and single-pole double-throw (1P2T) configurations, while the filters were designed using semi-lumped-element techniques. A preselector filter bank with postamplification was designed that consisted of four 5-pole Chebyshev bandpass topologies, with center frequencies of 1.5, 2.8, 4.9, and 9.2 GHz, respectively, and bandwidths slightly less than an octave. The LC filter realizations were designed using monolithic parallel plate (MIM) capacitors and high-impedance transmission lines for inductors. Realization of the inductor values was simplified by using tapped inductor techniques simulating an autotransformer, thus enabling the designer to select a variety of transforming ratios. Excellent channel-to-channel isolation, switching speed, and sensitivities, comparable to those of other much larger hybrid approaches, were obtained.<<ETX>>","PeriodicalId":339513,"journal":{"name":"1988., IEEE MTT-S International Microwave Symposium Digest","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124067388","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 : 1988-05-25DOI: 10.1109/MWSYM.1988.22081
J. Andrews, T. Holden, K.W. Lee, A. Podell
A broadband monolithic microwave integrated circuit (MMIC) voltage-controlled oscillator (VCO) is described that continuously tunes from 2.5 GHz to 6.0 GHz (85% bandwidth). Changing the tuning inductance allows band selection from 1.5 to 6.0 GHz. The circuit was designed using both linear and nonlinear computer-aided design (CAD).<>
{"title":"2.5-6.0 GHz broadband GaAs MMIC VCO","authors":"J. Andrews, T. Holden, K.W. Lee, A. Podell","doi":"10.1109/MWSYM.1988.22081","DOIUrl":"https://doi.org/10.1109/MWSYM.1988.22081","url":null,"abstract":"A broadband monolithic microwave integrated circuit (MMIC) voltage-controlled oscillator (VCO) is described that continuously tunes from 2.5 GHz to 6.0 GHz (85% bandwidth). Changing the tuning inductance allows band selection from 1.5 to 6.0 GHz. The circuit was designed using both linear and nonlinear computer-aided design (CAD).<<ETX>>","PeriodicalId":339513,"journal":{"name":"1988., IEEE MTT-S International Microwave Symposium Digest","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127955712","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 : 1988-05-25DOI: 10.1109/MWSYM.1988.22184
A. Daryoush, A. Khanna, K. Bhasin, R. Kunath
Large-aperture phased-array antennas operating at millimeter-wave frequencies are designed for space-based communications and imaging. Array elements are comprised of active transmit/receive (T/R) modules which are linked to the central processing unit through a high-speed fiber-optic network. Experimental results are reported that demonstrate optical control of active modules for satellite communication at 24 GHz. An approach called T/R level data mixing, which utilizes fiber-optic transmission of data signal to individual T/R modules to be upconverted by an optically synchronized local oscillator, is demonstrated at 24 GHz. In this study, a free-running HEMT oscillator, used as a local oscillator at 24 GHz, is synchronized using indirect subharmonic optical injection-locking over a locking range of 14 MHz. Results of data-link performance over 500-1000 MHz is also reported in terms of gain-bandwidth, linearity and third-order intercept, sensitivity, and dynamic range.<>
{"title":"Fiber optic links for millimeter wave communication satellites","authors":"A. Daryoush, A. Khanna, K. Bhasin, R. Kunath","doi":"10.1109/MWSYM.1988.22184","DOIUrl":"https://doi.org/10.1109/MWSYM.1988.22184","url":null,"abstract":"Large-aperture phased-array antennas operating at millimeter-wave frequencies are designed for space-based communications and imaging. Array elements are comprised of active transmit/receive (T/R) modules which are linked to the central processing unit through a high-speed fiber-optic network. Experimental results are reported that demonstrate optical control of active modules for satellite communication at 24 GHz. An approach called T/R level data mixing, which utilizes fiber-optic transmission of data signal to individual T/R modules to be upconverted by an optically synchronized local oscillator, is demonstrated at 24 GHz. In this study, a free-running HEMT oscillator, used as a local oscillator at 24 GHz, is synchronized using indirect subharmonic optical injection-locking over a locking range of 14 MHz. Results of data-link performance over 500-1000 MHz is also reported in terms of gain-bandwidth, linearity and third-order intercept, sensitivity, and dynamic range.<<ETX>>","PeriodicalId":339513,"journal":{"name":"1988., IEEE MTT-S International Microwave Symposium Digest","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127971945","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 : 1988-05-25DOI: 10.1109/MWSYM.1988.22077
Y. Shih, T. Ton, L. Bui
Design and test data are presented for waveguide-to-microstrip probe transitions that cover millimeter-wave frequencies from 26 to 110 GHz. The broadband design provides a good transition for full-waveguide bandwidth (40%). Because of the compact structure, the measured insertion loss contributed by the transition is less than 0.1 dB in Ka-band, less than 0.2 dB in Q-band and V-band, and less than 0.35 dB in W-band. These transitions are useful for the device and circuit characterisation of millimeter-wave MICs and MMICs.<>
{"title":"Waveguide-to-microstrip transitions for millimeter-wave applications","authors":"Y. Shih, T. Ton, L. Bui","doi":"10.1109/MWSYM.1988.22077","DOIUrl":"https://doi.org/10.1109/MWSYM.1988.22077","url":null,"abstract":"Design and test data are presented for waveguide-to-microstrip probe transitions that cover millimeter-wave frequencies from 26 to 110 GHz. The broadband design provides a good transition for full-waveguide bandwidth (40%). Because of the compact structure, the measured insertion loss contributed by the transition is less than 0.1 dB in Ka-band, less than 0.2 dB in Q-band and V-band, and less than 0.35 dB in W-band. These transitions are useful for the device and circuit characterisation of millimeter-wave MICs and MMICs.<<ETX>>","PeriodicalId":339513,"journal":{"name":"1988., IEEE MTT-S International Microwave Symposium Digest","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124426029","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 : 1988-05-25DOI: 10.1109/MWSYM.1988.22070
E. Belohoubek, A. Fathy, D. Kalokitis
Currently, most available high-T/sub c/ bulk material is in disk form that does not lend itself readily to microwave-loss measurements. A resonant measurement technique using low-impedance disk resonators is described. The configuration enhances the influence of conductor losses on the resonator Q and thereby permits the evaluation of disks as a function of temperature in a relatively simple test configuration with good accuracy. Measurements on bulk YBa/sub 2/Cu/sub 3/O/sub 6+x/ material are described with conductivities at X-band ranging up to 10 times that of Au at 65 degrees K.<>
{"title":"Microwave characteristics of bulk high-T/sub c/ superconductors","authors":"E. Belohoubek, A. Fathy, D. Kalokitis","doi":"10.1109/MWSYM.1988.22070","DOIUrl":"https://doi.org/10.1109/MWSYM.1988.22070","url":null,"abstract":"Currently, most available high-T/sub c/ bulk material is in disk form that does not lend itself readily to microwave-loss measurements. A resonant measurement technique using low-impedance disk resonators is described. The configuration enhances the influence of conductor losses on the resonator Q and thereby permits the evaluation of disks as a function of temperature in a relatively simple test configuration with good accuracy. Measurements on bulk YBa/sub 2/Cu/sub 3/O/sub 6+x/ material are described with conductivities at X-band ranging up to 10 times that of Au at 65 degrees K.<<ETX>>","PeriodicalId":339513,"journal":{"name":"1988., IEEE MTT-S International Microwave Symposium Digest","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133544452","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 : 1988-05-25DOI: 10.1109/MWSYM.1988.22131
R. Mansour, R.S.K. Tong, R. Macphie
Closed-form equations for the field distribution of the TM modes in ridge waveguides are presented, and, closed-form equations for both TE and TM modes are used with the conservation-of-complex-power technique to provide an efficient analysis of ridge waveguide E-plane discontinuities. The accuracy of the calculated results is checked by comparison with previously published and experimental results. Closed-form equations are also presented for the field distribution of the dominant hybrid mode in unilateral finlines.<>
{"title":"Simplified description of the field distribution in finlines and ridge waveguides and its application to the analysis of E-plane discontinuities","authors":"R. Mansour, R.S.K. Tong, R. Macphie","doi":"10.1109/MWSYM.1988.22131","DOIUrl":"https://doi.org/10.1109/MWSYM.1988.22131","url":null,"abstract":"Closed-form equations for the field distribution of the TM modes in ridge waveguides are presented, and, closed-form equations for both TE and TM modes are used with the conservation-of-complex-power technique to provide an efficient analysis of ridge waveguide E-plane discontinuities. The accuracy of the calculated results is checked by comparison with previously published and experimental results. Closed-form equations are also presented for the field distribution of the dominant hybrid mode in unilateral finlines.<<ETX>>","PeriodicalId":339513,"journal":{"name":"1988., IEEE MTT-S International Microwave Symposium Digest","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133651773","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 : 1988-05-25DOI: 10.1109/MWSYM.1988.22187
S. Weinreb, M. Pospieszalski, R. Norrod
After a review of recent progress in cryogenically cooled high-electron-mobility-transistor (HEMT) devices and amplifiers, a description is given of the construction and performance of a number of receiver front-ends built for radioastronomy applications using very-low-noise HEMT amplifiers and small, closed-cycle 13 K refrigerators. The noise temperature of receivers, measured at the room temperature circular waveguide input (for example, 10.5 K at 8.4 GHz), are only slightly inferior to those of solid-state maser receivers. A summary of the noise performance of all cryogenic front-ends constructed or planned for the very long baseline array (VLBA), comprised of ten 25-m-diameter paraboloidal reflectors each located in a different site within the US, is given.<>
{"title":"Cryogenic, HEMT, low-noise receivers for 1.3 to 43 GHz range","authors":"S. Weinreb, M. Pospieszalski, R. Norrod","doi":"10.1109/MWSYM.1988.22187","DOIUrl":"https://doi.org/10.1109/MWSYM.1988.22187","url":null,"abstract":"After a review of recent progress in cryogenically cooled high-electron-mobility-transistor (HEMT) devices and amplifiers, a description is given of the construction and performance of a number of receiver front-ends built for radioastronomy applications using very-low-noise HEMT amplifiers and small, closed-cycle 13 K refrigerators. The noise temperature of receivers, measured at the room temperature circular waveguide input (for example, 10.5 K at 8.4 GHz), are only slightly inferior to those of solid-state maser receivers. A summary of the noise performance of all cryogenic front-ends constructed or planned for the very long baseline array (VLBA), comprised of ten 25-m-diameter paraboloidal reflectors each located in a different site within the US, is given.<<ETX>>","PeriodicalId":339513,"journal":{"name":"1988., IEEE MTT-S International Microwave Symposium Digest","volume":"8 5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133668325","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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