{"title":"CAD of the downconversion and IF amplification parts of a microwave receiver","authors":"E. A. Abdallah, M. A. Nassef, A. Sobih","doi":"10.1109/APMC.1999.829923","DOIUrl":"https://doi.org/10.1109/APMC.1999.829923","url":null,"abstract":"By the aid of the Microwave Design System (MDS), software package, the design and analysis of the downconversion and IF amplification parts of a microwave superheterodyne receiver, operating in the S-band, and the implementation of the designed subsystem in microstrip form, is presented. The designed subsystem has two modes of operation according to the desired application, either a large dynamic range the a high sensitivity mode. All individual circuits constituting this subsystem in the first mode of operation are fabricated separately and their characteristics are measured to test their performances. Then the integration of these circuits on a single substrate is considered and its characteristics are also tested and measured.","PeriodicalId":145588,"journal":{"name":"1999 Asia Pacific Microwave Conference. APMC'99. Microwaves Enter the 21st Century. Conference Proceedings (Cat. No.99TH8473)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122333093","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}
{"title":"Microstrip ring bandpass filters with new interdigital side-coupling structure","authors":"W. Jung, H. Park, Jong‐Chul Lee","doi":"10.1109/APMC.1999.833682","DOIUrl":"https://doi.org/10.1109/APMC.1999.833682","url":null,"abstract":"In this paper, dual-mode microstrip ring bandpass filters with new interdigital side-coupling structure are presented. The interdigital side-coupling scheme has much lower insertion and return losses than any other side-coupling structure. Dual-mode microstrip ring bandpass filters with one or two local resonant split (LRS) circuits centered at 2.2 and 2.05 GHz show 3-dB bandwidths of only 70 and 75 MHz, the insertion losses of -2.75 and -2.12 dB, and return losses of -19.48 and -19.65 dB, respectively.","PeriodicalId":145588,"journal":{"name":"1999 Asia Pacific Microwave Conference. APMC'99. Microwaves Enter the 21st Century. Conference Proceedings (Cat. No.99TH8473)","volume":"183 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123132706","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}
{"title":"RCS computation of jet engine with complex termination based on multiplaten Z-buffer algorithm","authors":"Jin-Lin Hu, C. Chan, Shi-ming Lin","doi":"10.1109/APMC.1999.833709","DOIUrl":"https://doi.org/10.1109/APMC.1999.833709","url":null,"abstract":"The analysis of electromagnetic scattering from the jet engine with complex termination is a very difficult task because the electrical size of the engine cavity is very large and the geometry of engine termination is very complex. In this paper, the shooting-and-bounding rays (SBR) method is employed to analyse electromagnetic scattering from jet engines with complex termination. In order to accelerate the ray tracing and to economise the computation memory, the multiplaten Z-buffer algorithm is employed to model the jet engine. Two jet engine models with the complex termination are analysed. Excellent results are obtained for the two models.","PeriodicalId":145588,"journal":{"name":"1999 Asia Pacific Microwave Conference. APMC'99. Microwaves Enter the 21st Century. Conference Proceedings (Cat. No.99TH8473)","volume":"88 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120969517","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}
{"title":"A generic approach for the optimum design of microwave and millimeter wave balanced subharmonically pumped mixers","authors":"Huifang Gu, K. Wu","doi":"10.1109/APMC.1999.829919","DOIUrl":"https://doi.org/10.1109/APMC.1999.829919","url":null,"abstract":"We present a generic approach, which can be used to estimate the optimum loading conditions at various idler frequencies and also to give the best achievable performance of balanced subharmonically pumped mixers. This provides designers with a practical guideline for designing such mixers. We demonstrate in this paper through a design example that there is quite a difference in the conversion loss between the nonoptimized loading and the optimized loading conditions of a nonlinear device, namely, 12.8 dB and 2.8 dB in view of theoretical results. Using the proposed method, the designed mixer at 14 GHz has a comparable performance with balanced fundamental mixers except its inherent advantages.","PeriodicalId":145588,"journal":{"name":"1999 Asia Pacific Microwave Conference. APMC'99. Microwaves Enter the 21st Century. Conference Proceedings (Cat. No.99TH8473)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114969680","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}
{"title":"Rigorous modal-expansion analysis of asymmetrical dipole antennas","authors":"Z. Shen","doi":"10.1109/APMC.1999.829879","DOIUrl":"https://doi.org/10.1109/APMC.1999.829879","url":null,"abstract":"This paper describes a rigorous analysis of asymmetrical cylindrical dipole antennas by the modal-expansion method. The analysis is facilitated by introducing two parallel plates coated with anisotropic perfectly matched layers (PML) to enclose the dipole antenna. Field expressions for all the subregions of the resulting structure can be readily derived and the expansion coefficients are found by enforcing the continuity conditions of tangential field components across the regional interfaces. Comparison with experimental data shows an excellent agreement. Numerical results are presented for the input impedances, current distributions, and radiation patterns of various dipole antennas.","PeriodicalId":145588,"journal":{"name":"1999 Asia Pacific Microwave Conference. APMC'99. Microwaves Enter the 21st Century. Conference Proceedings (Cat. No.99TH8473)","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134016125","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}
{"title":"An improved nonlinear analysis and design method of microstrip oscillators based on modern CAD techniques","authors":"A. El-Tager, E. Abdallah, M. A. Nassef","doi":"10.1109/APMC.1999.828066","DOIUrl":"https://doi.org/10.1109/APMC.1999.828066","url":null,"abstract":"In this paper, a novel nonlinear oscillator design methodology is proposed to obtain an improved microstrip oscillator performance. It combines the advantages of both quasi-linear and nonlinear design approaches. It uses an accurate implemented nonlinear MESFET model, based on multi-bias measurements. It also uses an enhanced harmonic balance nonlinear analysis technique. This design method makes full use of the powerful capabilities of the up-to-date CAD techniques in designing, simulating, and optimizing microstrip oscillators, taking all discontinuities, parasitics and packaging effects into consideration. Finally, an 8.5 GHz oscillator is fabricated and an excellent agreement between the theoretical and experimental results is obtained.","PeriodicalId":145588,"journal":{"name":"1999 Asia Pacific Microwave Conference. APMC'99. Microwaves Enter the 21st Century. Conference Proceedings (Cat. No.99TH8473)","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134250060","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}
{"title":"Comparative study of coaxial-cavity and cylindrical-cavity gyrotron oscillators with electron-beam misalignment taken into account","authors":"Shi-Chang Zhang","doi":"10.1109/APMC.1999.833722","DOIUrl":"https://doi.org/10.1109/APMC.1999.833722","url":null,"abstract":"Comparative study is given to the starting current and output power of the coaxial-cavity and cylindrical-cavity gyrotron oscillators operating in the millimeter wave ranges, where the electron-beam misalignment is taken into account. The numerical analysis shows that the coaxial-cavity gyrotron oscillator has lower starting current and less power loss than the cylindrical-cavity gyrotron oscillator when the electron beam has a misalignment to the cavity.","PeriodicalId":145588,"journal":{"name":"1999 Asia Pacific Microwave Conference. APMC'99. Microwaves Enter the 21st Century. Conference Proceedings (Cat. No.99TH8473)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134421415","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}
{"title":"A study on the optimization of a 60 GHz wireless LAN installation environment","authors":"T. Kubo, M. Kimura, R. Sato","doi":"10.1109/APMC.1999.828079","DOIUrl":"https://doi.org/10.1109/APMC.1999.828079","url":null,"abstract":"This paper describes the conditions for placing electromagnetic absorbers to control the delay waves appearing in a 60 GHz band wireless LAN installation environment. It was found that absorbers located at the reflection points of the waves, which were calculated using a ray-tracing method simulation, could suppress the delay waves effectively, and the level of delay waves could be controlled by the size of the absorber.","PeriodicalId":145588,"journal":{"name":"1999 Asia Pacific Microwave Conference. APMC'99. Microwaves Enter the 21st Century. Conference Proceedings (Cat. No.99TH8473)","volume":"224 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132999884","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}
Wen-Shen Wuen, Shen-Fong Liu, Kuang-Yu Chen, K. Wen
{"title":"Receiver front-end chipsets for 2.4-GHz wireless LAN in 0.5 /spl mu/m BiCMOS","authors":"Wen-Shen Wuen, Shen-Fong Liu, Kuang-Yu Chen, K. Wen","doi":"10.1109/APMC.1999.829905","DOIUrl":"https://doi.org/10.1109/APMC.1999.829905","url":null,"abstract":"The paper presents the design and implementation of receiver front-end chipsets for 2.4-GHz 802.11 Wireless LAN. The chipsets consist of low noise amplifier and down conversion mixers in single-balanced and double-balanced structures. The LNA is designed with optimum bias technique for minimizing noise figure. The front-end chipsets are fabricated with 0.5-/spl mu/m BiCMOS process with f/sub T/ of 13-GHz and packaged in SOP8 package. It is presented that under 802.11 standard specified system link budget, the chipset hit the design performance and leave the design margin of 4.89 dB.","PeriodicalId":145588,"journal":{"name":"1999 Asia Pacific Microwave Conference. APMC'99. Microwaves Enter the 21st Century. Conference Proceedings (Cat. No.99TH8473)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133361476","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}
{"title":"Dependence on antenna output power of temperature rise in human head for portable telephones","authors":"Jianqing Wang, T. Joukou, O. Fujiwara","doi":"10.1109/APMC.1999.829913","DOIUrl":"https://doi.org/10.1109/APMC.1999.829913","url":null,"abstract":"Since biological hazards due to RF exposure are caused mainly by a temperature rise in tissue, the localized specific absorption rate (SAR) should be related to the temperature rise in the human head for portable telephones. Although the SAR is known to be directly proportional to the antenna output power of portable telephones, the dependence of temperature rise on the antenna output power remains unclear. In this paper, the relationship between the peak temperature rise in a human head and the antenna output power is investigated by using the finite-difference time-domain (FDTD) method. It is found that the peak temperature rise is approximately proportional to the antenna output power below 1 W and also that the peak temperature rise in the brain can be estimated from its blood-flow and heating potential.","PeriodicalId":145588,"journal":{"name":"1999 Asia Pacific Microwave Conference. APMC'99. Microwaves Enter the 21st Century. Conference Proceedings (Cat. No.99TH8473)","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132521852","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}