Pub Date : 2011-06-05DOI: 10.1109/MWSYM.2011.5972641
M. S. Dadash, K. Moussakhani, N. Nikolova, Li Liu
A new sensitivity analysis method is proposed to compute the S-parameter Jacobian for metallic shapes. The method is exact in the sense that it uses an analytical formulation, which is independent of the method of numerical full-wave analysis and the respective system matrix. It uses only the field solution on the surface of the metallic objects. The field solution can be provided by any valid electromagnetic analysis. The computation is a post-process and its overhead is negligible in comparison with the simulation time. The method is validated with examples using a commercial finite-element-method simulator, which can provide not only the S-parameters but also their sensitivities. The method can potentially provide breakthrough capability for electromagnetic solvers, which currently lack sensitivity analysis, e.g., solvers based on the method of moments or the finite-difference time-domain method.
{"title":"New method for exact self-adjoint sensitivity analysis of metallic shapes","authors":"M. S. Dadash, K. Moussakhani, N. Nikolova, Li Liu","doi":"10.1109/MWSYM.2011.5972641","DOIUrl":"https://doi.org/10.1109/MWSYM.2011.5972641","url":null,"abstract":"A new sensitivity analysis method is proposed to compute the S-parameter Jacobian for metallic shapes. The method is exact in the sense that it uses an analytical formulation, which is independent of the method of numerical full-wave analysis and the respective system matrix. It uses only the field solution on the surface of the metallic objects. The field solution can be provided by any valid electromagnetic analysis. The computation is a post-process and its overhead is negligible in comparison with the simulation time. The method is validated with examples using a commercial finite-element-method simulator, which can provide not only the S-parameters but also their sensitivities. The method can potentially provide breakthrough capability for electromagnetic solvers, which currently lack sensitivity analysis, e.g., solvers based on the method of moments or the finite-difference time-domain method.","PeriodicalId":294862,"journal":{"name":"2011 IEEE MTT-S International Microwave Symposium","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116397966","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 : 2011-06-05DOI: 10.1109/MWSYM.2011.5972692
A. Çağrı Ulusoy, H. Schumacher
A highly efficient QPSK demodulator module is presented, which synchronizes carrier phase and frequency in the analog domain by feed-forward carrier recovery. By this, the need for high-precision ADCs is eliminated, which become especially problematic for data rates exceeding several Gbit/s. The QPSK demodulator is realized as a SiGe HBT MMIC and is packaged on a standard low cost substrate material, where a narrow-bandwidth microstrip bandpass filter is also integrated. Synchronous demodulation of up to 5 Gbit/s data rate is demonstrated. Moreover, it is experimentally validated that through the presented feed-forward carrier recovery a substantial amount of phase noise suppression can be achieved.
{"title":"A system-on-package analog synchronous QPSK demodulator for ultra-high rate 60 GHz wireless communications","authors":"A. Çağrı Ulusoy, H. Schumacher","doi":"10.1109/MWSYM.2011.5972692","DOIUrl":"https://doi.org/10.1109/MWSYM.2011.5972692","url":null,"abstract":"A highly efficient QPSK demodulator module is presented, which synchronizes carrier phase and frequency in the analog domain by feed-forward carrier recovery. By this, the need for high-precision ADCs is eliminated, which become especially problematic for data rates exceeding several Gbit/s. The QPSK demodulator is realized as a SiGe HBT MMIC and is packaged on a standard low cost substrate material, where a narrow-bandwidth microstrip bandpass filter is also integrated. Synchronous demodulation of up to 5 Gbit/s data rate is demonstrated. Moreover, it is experimentally validated that through the presented feed-forward carrier recovery a substantial amount of phase noise suppression can be achieved.","PeriodicalId":294862,"journal":{"name":"2011 IEEE MTT-S International Microwave Symposium","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122912618","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 : 2011-06-05DOI: 10.1109/MWSYM.2011.5972713
F. Jolani, Yiqiang Yu, Z. Chen
In this paper, a hybrid FDTD and leapfrog alternating-direction-implicit finite-difference time-domain (ADI-FDTD) method is presented. The perfectly matched layer (PML) absorbing boundary conditions are also incorporated in the method and non-uniform grids are deployed to efficiently model electromagnetic radiation and scattering in open domains. In the proposed hybridization method, the leapfrog ADI-FDTD is applied to regions of fine grids, while the FDTD is applied to regions of coarse grids. As a result, a single relatively large time step can be used uniformly over a complete solution domain; this yields a significant CPU time reduction in comparison with the conventional FDTD while maintaining accuracy with fine grid regions. The effectiveness and efficiency of the proposed hybrid method are validated and evaluated with numerical results.
{"title":"A hybrid FDTD and leapfrog ADI-FDTD method with PML implementation","authors":"F. Jolani, Yiqiang Yu, Z. Chen","doi":"10.1109/MWSYM.2011.5972713","DOIUrl":"https://doi.org/10.1109/MWSYM.2011.5972713","url":null,"abstract":"In this paper, a hybrid FDTD and leapfrog alternating-direction-implicit finite-difference time-domain (ADI-FDTD) method is presented. The perfectly matched layer (PML) absorbing boundary conditions are also incorporated in the method and non-uniform grids are deployed to efficiently model electromagnetic radiation and scattering in open domains. In the proposed hybridization method, the leapfrog ADI-FDTD is applied to regions of fine grids, while the FDTD is applied to regions of coarse grids. As a result, a single relatively large time step can be used uniformly over a complete solution domain; this yields a significant CPU time reduction in comparison with the conventional FDTD while maintaining accuracy with fine grid regions. The effectiveness and efficiency of the proposed hybrid method are validated and evaluated with numerical results.","PeriodicalId":294862,"journal":{"name":"2011 IEEE MTT-S International Microwave Symposium","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114402180","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 : 2011-06-05DOI: 10.1109/MWSYM.2011.5972855
S. Ahmed, A. Schiessl, L. Schmidt
The interest on active millimeter-wave and microwave imaging systems is increasing nowadays due to their utilization in security, medical, and industrial applications. Imaging systems using monostatic arrays suffer from the high number of antenna positions, making a fully electronic solution very costly and impractical. Multistatic arrays, however, offer the chance for high reduction factors in the number of antennas, and then allow for fully electronic solutions. Here, a new array architecture is presented, which is suitable for real-time operation and is capable of delivering high image quality in means of resolution and dynamic range. An example array is demonstrated for operation from 72 to 80 GHz. The imaging system hardware is introduced, along with imaging results of humans.
{"title":"Novel fully electronic active real-time millimeter-wave imaging system based on a planar multistatic sparse array","authors":"S. Ahmed, A. Schiessl, L. Schmidt","doi":"10.1109/MWSYM.2011.5972855","DOIUrl":"https://doi.org/10.1109/MWSYM.2011.5972855","url":null,"abstract":"The interest on active millimeter-wave and microwave imaging systems is increasing nowadays due to their utilization in security, medical, and industrial applications. Imaging systems using monostatic arrays suffer from the high number of antenna positions, making a fully electronic solution very costly and impractical. Multistatic arrays, however, offer the chance for high reduction factors in the number of antennas, and then allow for fully electronic solutions. Here, a new array architecture is presented, which is suitable for real-time operation and is capable of delivering high image quality in means of resolution and dynamic range. An example array is demonstrated for operation from 72 to 80 GHz. The imaging system hardware is introduced, along with imaging results of humans.","PeriodicalId":294862,"journal":{"name":"2011 IEEE MTT-S International Microwave Symposium","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114441954","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 : 2011-06-05DOI: 10.1109/MWSYM.2011.5972878
H. Razmjoo, M. Movahhedi, A. Hakimi
In this paper, a modified meshless method, one of the meshless numerical techniques that has recently emerged in the area of computational electromagnetics, is extended to time-domain electromagnetic modeling. In the space domain, the fields at the collocation points are expanded into a series of new Shepard functions which are suggested recently and are treated with a meshless method procedure. In comparison with the most traditional schemes of the meshless methods this approximation function has lower computational cost with same level of accuracy. Application of the method for electromagnetic field computation and verification of the obtained results using theoretically known solution is also presented.
{"title":"Electromagnetic time domain modeling using an improved meshless method","authors":"H. Razmjoo, M. Movahhedi, A. Hakimi","doi":"10.1109/MWSYM.2011.5972878","DOIUrl":"https://doi.org/10.1109/MWSYM.2011.5972878","url":null,"abstract":"In this paper, a modified meshless method, one of the meshless numerical techniques that has recently emerged in the area of computational electromagnetics, is extended to time-domain electromagnetic modeling. In the space domain, the fields at the collocation points are expanded into a series of new Shepard functions which are suggested recently and are treated with a meshless method procedure. In comparison with the most traditional schemes of the meshless methods this approximation function has lower computational cost with same level of accuracy. Application of the method for electromagnetic field computation and verification of the obtained results using theoretically known solution is also presented.","PeriodicalId":294862,"journal":{"name":"2011 IEEE MTT-S International Microwave Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129418284","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 : 2011-06-05DOI: 10.1109/MWSYM.2011.5972659
Ko-Wen Hsu, Wen‐Hua Tu
In this paper, a compact wideband bandpass filter using asymmetrical resonators is proposed. A lossless transmission-line model calculation is used to determine the resonant responses of the asymmetrical resonator, which consists of a uniform resonator tapped by an open stub. By adjusting the stub length and the tapping position, one can control the resonant frequencies for wideband bandpass filter design purpose. With the two inherent transmission zeros at both sides of passband, a sharp rejection response is achieved to improve the stopband performance. For the proposed wideband bandpass filter, from 2 GHz to 4.8 GHz (90%), the measured return loss is greater than 11 dB, and the measured insertion loss is less than 2 dB. The maximum group delay variation is 0.7 ns. Furthermore, there are two transmission zeros at 1.8 and 5.15 GHz for a sharp cutoff response. The effective area measures only 0.34λg ×0.08λg at center frequency.
{"title":"Compact high-rejection wideband bandpass filter using asymmetrical resonators","authors":"Ko-Wen Hsu, Wen‐Hua Tu","doi":"10.1109/MWSYM.2011.5972659","DOIUrl":"https://doi.org/10.1109/MWSYM.2011.5972659","url":null,"abstract":"In this paper, a compact wideband bandpass filter using asymmetrical resonators is proposed. A lossless transmission-line model calculation is used to determine the resonant responses of the asymmetrical resonator, which consists of a uniform resonator tapped by an open stub. By adjusting the stub length and the tapping position, one can control the resonant frequencies for wideband bandpass filter design purpose. With the two inherent transmission zeros at both sides of passband, a sharp rejection response is achieved to improve the stopband performance. For the proposed wideband bandpass filter, from 2 GHz to 4.8 GHz (90%), the measured return loss is greater than 11 dB, and the measured insertion loss is less than 2 dB. The maximum group delay variation is 0.7 ns. Furthermore, there are two transmission zeros at 1.8 and 5.15 GHz for a sharp cutoff response. The effective area measures only 0.34λg ×0.08λg at center frequency.","PeriodicalId":294862,"journal":{"name":"2011 IEEE MTT-S International Microwave Symposium","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128687604","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 : 2011-06-05DOI: 10.1109/MWSYM.2011.5972885
S. Rezaei, M. Hashmi, Behzad Dehlaghi, F. Ghannouchi
This paper presents a systematic methodology to design a diode-based RF predistortion linearizer that can be used to linearize power amplifiers with dual inflection points in their distortion characteristics. The proposed structure contains anti parallel configuration of Schottky diodes, complemented with a PIN diode in parallel, connected to through and coupled ports of a 90° hybrid coupler using λ/4 transmission lines. The use of a PIN diode in the linearizer provides it with an extra level of freedom in achieving the desired level of amplitude and inflection depth in the AM/AM characteristic. A systematic design procedure using this configuration is proposed and applied to linearize a commercial power amplifier. Two tone test experimental results show that the IM3 cancellation of 10 dB in 1 MHz separation between tones at 2.14 GHz can be achieved.
{"title":"A systematic methodology to design analog predistortion linearizer for dual inflection power amplifiers","authors":"S. Rezaei, M. Hashmi, Behzad Dehlaghi, F. Ghannouchi","doi":"10.1109/MWSYM.2011.5972885","DOIUrl":"https://doi.org/10.1109/MWSYM.2011.5972885","url":null,"abstract":"This paper presents a systematic methodology to design a diode-based RF predistortion linearizer that can be used to linearize power amplifiers with dual inflection points in their distortion characteristics. The proposed structure contains anti parallel configuration of Schottky diodes, complemented with a PIN diode in parallel, connected to through and coupled ports of a 90° hybrid coupler using λ/4 transmission lines. The use of a PIN diode in the linearizer provides it with an extra level of freedom in achieving the desired level of amplitude and inflection depth in the AM/AM characteristic. A systematic design procedure using this configuration is proposed and applied to linearize a commercial power amplifier. Two tone test experimental results show that the IM3 cancellation of 10 dB in 1 MHz separation between tones at 2.14 GHz can be achieved.","PeriodicalId":294862,"journal":{"name":"2011 IEEE MTT-S International Microwave Symposium","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124586284","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 : 2011-06-05DOI: 10.1109/MWSYM.2011.5973250
Mun‐Woo Lee, S. Kam, Y. Jeong
This paper describes a new three-stage Doherty power amplifier (DPA) with an adaptive driving amplifier inserted at the input of the carrier cell. This driving amplifier controls the input power of the carrier cell to eliminate the gate leakage current at high input power levels. Using an envelope tracking technique, the gate bias voltage of the driving amplifier is adjusted according to the input power levels. For verification, the driving amplifier, carrier, and peaking cells are fabricated using 10-W, 15-W, and 35-W GaN HEMTs, respectively, at 3.5 GHz. For a continuous wave signal, total drain efficiencies (DEs) of 37.3% and 45.6% are achieved at approximately 9.5- and 4.3-dB back-off powers (BOPs), respectively. For a worldwide interoperability for microwave access (WiMAX) signal, the proposed DPA has a total DE of 39.5 % at an 8-dB BOP.
本文介绍了一种新型的三级Doherty功率放大器(DPA)，该放大器在载波单元的输入端插入一个自适应驱动放大器。该驱动放大器控制载波单元的输入功率，以消除高输入功率水平下的栅极泄漏电流。采用包络跟踪技术，驱动放大器的栅极偏置电压可根据输入功率电平进行调整。为了验证，驱动放大器、载波和峰值单元分别使用3.5 GHz的10 w、15 w和35 w GaN hemt制造。对于连续波信号，在大约9.5 db和4.3 db的回退功率(BOPs)下，总漏极效率(de)分别达到37.3%和45.6%。对于微波接入(WiMAX)信号的全球互操作性，建议的DPA在8 db BOP下的总DE为39.5%。
{"title":"Highly efficient three-stage Doherty power amplifier with adaptive driving amplifier for 3.5 GHz WiMAX applications","authors":"Mun‐Woo Lee, S. Kam, Y. Jeong","doi":"10.1109/MWSYM.2011.5973250","DOIUrl":"https://doi.org/10.1109/MWSYM.2011.5973250","url":null,"abstract":"This paper describes a new three-stage Doherty power amplifier (DPA) with an adaptive driving amplifier inserted at the input of the carrier cell. This driving amplifier controls the input power of the carrier cell to eliminate the gate leakage current at high input power levels. Using an envelope tracking technique, the gate bias voltage of the driving amplifier is adjusted according to the input power levels. For verification, the driving amplifier, carrier, and peaking cells are fabricated using 10-W, 15-W, and 35-W GaN HEMTs, respectively, at 3.5 GHz. For a continuous wave signal, total drain efficiencies (DEs) of 37.3% and 45.6% are achieved at approximately 9.5- and 4.3-dB back-off powers (BOPs), respectively. For a worldwide interoperability for microwave access (WiMAX) signal, the proposed DPA has a total DE of 39.5 % at an 8-dB BOP.","PeriodicalId":294862,"journal":{"name":"2011 IEEE MTT-S International Microwave Symposium","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124639047","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 : 2011-06-05DOI: 10.1109/MWSYM.2011.5972820
A. Franc, E. Pistono, N. Corrao, D. Gloria, P. Ferrari
A set of slow-wave transmission lines designed in the BiCMOS9-MW technology from STMicroelectronics is characterized up to 110 GHz. State-of-the-art measured quality factors are obtained: 40 at 60 GHz, and more than 50 at 90 GHz. These transmission lines are also quite compact, thanks to a high effective relative permittivity, from 8 to 15 for a characteristic impedance, respectively between 70 Ω and 30 Ω. Based on these results, two power dividers using these slow-wave transmission lines are designed at millimeter-wave frequencies (77 GHz and 94 GHz). The measured S parameters present insertion loss lower than −3.5 dB and return loss better than −20 dB, at the operating frequency. Moreover the use of slow-wave transmission lines leads to a miniaturization of 70 % compared to a classical power splitter designed with microstrip or CPW transmission lines.
{"title":"Compact high-Q, low-loss mmW transmission lines and power splitters in RF CMOS technology","authors":"A. Franc, E. Pistono, N. Corrao, D. Gloria, P. Ferrari","doi":"10.1109/MWSYM.2011.5972820","DOIUrl":"https://doi.org/10.1109/MWSYM.2011.5972820","url":null,"abstract":"A set of slow-wave transmission lines designed in the BiCMOS9-MW technology from STMicroelectronics is characterized up to 110 GHz. State-of-the-art measured quality factors are obtained: 40 at 60 GHz, and more than 50 at 90 GHz. These transmission lines are also quite compact, thanks to a high effective relative permittivity, from 8 to 15 for a characteristic impedance, respectively between 70 Ω and 30 Ω. Based on these results, two power dividers using these slow-wave transmission lines are designed at millimeter-wave frequencies (77 GHz and 94 GHz). The measured S parameters present insertion loss lower than −3.5 dB and return loss better than −20 dB, at the operating frequency. Moreover the use of slow-wave transmission lines leads to a miniaturization of 70 % compared to a classical power splitter designed with microstrip or CPW transmission lines.","PeriodicalId":294862,"journal":{"name":"2011 IEEE MTT-S International Microwave Symposium","volume":"5 12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124646614","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 : 2011-06-05DOI: 10.1109/MWSYM.2011.5972807
M. Le Coq, É. Rius, C. Quendo, B. Potelon, J. Favennec, L. Estagerie, P. Moroni, Y. Clavet, A. Manchec
This paper presents a C-band planar filter miniaturized through use of high-permittivity substrates to meet the specifications. The drawbacks associated to such substrates are briefly recalled. To overcome them, the filter under study was based on the DBR topology and realized on a high-K commercial substrate. This ceramic has a relative permittivity of 90 and a low dielectric tangent (tanδ < 10−3). Finally, the results of simulations and measurements are presented and discussed, particularly the footprint reduction.
{"title":"Miniature microstrip filter using high-permittivity ceramic substrates (er = 90)","authors":"M. Le Coq, É. Rius, C. Quendo, B. Potelon, J. Favennec, L. Estagerie, P. Moroni, Y. Clavet, A. Manchec","doi":"10.1109/MWSYM.2011.5972807","DOIUrl":"https://doi.org/10.1109/MWSYM.2011.5972807","url":null,"abstract":"This paper presents a C-band planar filter miniaturized through use of high-permittivity substrates to meet the specifications. The drawbacks associated to such substrates are briefly recalled. To overcome them, the filter under study was based on the DBR topology and realized on a high-K commercial substrate. This ceramic has a relative permittivity of 90 and a low dielectric tangent (tanδ < 10−3). Finally, the results of simulations and measurements are presented and discussed, particularly the footprint reduction.","PeriodicalId":294862,"journal":{"name":"2011 IEEE MTT-S International Microwave Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130331510","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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