Pub Date : 2016-12-01DOI: 10.1109/APMC.2016.7931467
Si-Yan Chen, Q. Chu, N. Shinohara
A bandwidth reconfigurable planar antenna for WLAN/ WiMAX applications is proposed. The proposed antenna consists of a rectangular radiation patch with a narrow vertical slot and an L-shaped slot, a ground plane and a microstrip feed-line. Two PIN diodes are attached in the middle of the L-shape slot. They are used to control the current flow on the radiation patch. Therefore, the bandwidth reconfigurability is enabled by switching the operating states of PIN diodes. The impedance bandwidth ranges from 22% to 78%. The agreement between simulated and measured results validates the proposed design.
{"title":"A bandwidth reconfigurable planar antenna for WLAN/WiMAX applications","authors":"Si-Yan Chen, Q. Chu, N. Shinohara","doi":"10.1109/APMC.2016.7931467","DOIUrl":"https://doi.org/10.1109/APMC.2016.7931467","url":null,"abstract":"A bandwidth reconfigurable planar antenna for WLAN/ WiMAX applications is proposed. The proposed antenna consists of a rectangular radiation patch with a narrow vertical slot and an L-shaped slot, a ground plane and a microstrip feed-line. Two PIN diodes are attached in the middle of the L-shape slot. They are used to control the current flow on the radiation patch. Therefore, the bandwidth reconfigurability is enabled by switching the operating states of PIN diodes. The impedance bandwidth ranges from 22% to 78%. The agreement between simulated and measured results validates the proposed design.","PeriodicalId":166478,"journal":{"name":"2016 Asia-Pacific Microwave Conference (APMC)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126462616","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 : 2016-12-01DOI: 10.1109/APMC.2016.7931462
A. Pattanayak, G. Rana, S. Duttagupta, P. Gandhi
A compact reflectarray antenna is presented here, consisting of different element types. Periodicity of the proposed unit cell smaller than 0.5λ in both directions is studied here. Non-resonant behavior of unit cells leads to solve the problem of inherently narrow bandwidth of such antenna. Main aim of unit cell design is focused to get phasing elements fitted in subwavelength grid size as well as to get full range of 360 degree reflection phase angle. The proposed array is fabricated on a low loss PTFE substrate of thickness 0.053 λ at 5 GHz and illuminated by an offset feed horn antenna. Radiation pattern results show a very précised far-field beam with 3-db beamwidth of 7.5 and 7.3 degree for two principle planes respectively with a gain of 24 dB at 5 GHz.
{"title":"A broadband reflectarray with combination of subwavelength phasing elements","authors":"A. Pattanayak, G. Rana, S. Duttagupta, P. Gandhi","doi":"10.1109/APMC.2016.7931462","DOIUrl":"https://doi.org/10.1109/APMC.2016.7931462","url":null,"abstract":"A compact reflectarray antenna is presented here, consisting of different element types. Periodicity of the proposed unit cell smaller than 0.5λ in both directions is studied here. Non-resonant behavior of unit cells leads to solve the problem of inherently narrow bandwidth of such antenna. Main aim of unit cell design is focused to get phasing elements fitted in subwavelength grid size as well as to get full range of 360 degree reflection phase angle. The proposed array is fabricated on a low loss PTFE substrate of thickness 0.053 λ at 5 GHz and illuminated by an offset feed horn antenna. Radiation pattern results show a very précised far-field beam with 3-db beamwidth of 7.5 and 7.3 degree for two principle planes respectively with a gain of 24 dB at 5 GHz.","PeriodicalId":166478,"journal":{"name":"2016 Asia-Pacific Microwave Conference (APMC)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126571515","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 : 2016-12-01DOI: 10.1109/APMC.2016.7931452
Shashi Kumar, S. Joshi
SAR tomography is an advanced imaging technology in the field of SAR image processing. By resolving the multiple targets within a single pixel, it is able to retrieve the vertical structure of the scatterer in cross-range direction. In this paper Fourier and Capon based spectral estimation techniques of SAR tomography are implemented on spaceborne SAR dataset to reconstruct the forest vertical profile.
{"title":"SAR tomography for forest structure investigation","authors":"Shashi Kumar, S. Joshi","doi":"10.1109/APMC.2016.7931452","DOIUrl":"https://doi.org/10.1109/APMC.2016.7931452","url":null,"abstract":"SAR tomography is an advanced imaging technology in the field of SAR image processing. By resolving the multiple targets within a single pixel, it is able to retrieve the vertical structure of the scatterer in cross-range direction. In this paper Fourier and Capon based spectral estimation techniques of SAR tomography are implemented on spaceborne SAR dataset to reconstruct the forest vertical profile.","PeriodicalId":166478,"journal":{"name":"2016 Asia-Pacific Microwave Conference (APMC)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125728630","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 : 2016-12-01DOI: 10.1109/APMC.2016.7931429
Yen-Chung Lin, T. Chu
This paper describes a measurement technique to reconstruct the two-port scattering parameters of an amplifier from five one-port results measured by a vector network analyzer (VNA). Formulation on the use of auxiliary circuits and one-port VNA is given. The criterion in selecting the auxiliary circuit is also addressed. The reconstructed results are shown in close agreement with the directly measured results.
{"title":"Measurement of two-pot S-parameters of an amplifier using one-port vector network analyzer","authors":"Yen-Chung Lin, T. Chu","doi":"10.1109/APMC.2016.7931429","DOIUrl":"https://doi.org/10.1109/APMC.2016.7931429","url":null,"abstract":"This paper describes a measurement technique to reconstruct the two-port scattering parameters of an amplifier from five one-port results measured by a vector network analyzer (VNA). Formulation on the use of auxiliary circuits and one-port VNA is given. The criterion in selecting the auxiliary circuit is also addressed. The reconstructed results are shown in close agreement with the directly measured results.","PeriodicalId":166478,"journal":{"name":"2016 Asia-Pacific Microwave Conference (APMC)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114064543","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 : 2016-12-01DOI: 10.1109/APMC.2016.7931439
A. Bhattacharya, Bidisha Dasgupta
In this article, a hybrid combination of two resonating structures, one Cylindrical Dielectric Resonator Antenna (CDRA) and a modified slot geometry along with some more additional defects in ground plane (GP) has been proposed. Multiple resonances of the combination offer wide bandwidth over the complete X - band. A U-shaped microstrip feed is also incorporated in the proposed structure. The proposed design offers large impedance bandwidth (measured) about 45 % (S11 < −10 dB) and a peak gain of about 4.5 dBi. Some hybrid modes of CDRA are also excited and addressed in the proposed structure.
{"title":"A novel compact Cylindrical Dielectric Resonator Antenna with radiating slots for X-band applications","authors":"A. Bhattacharya, Bidisha Dasgupta","doi":"10.1109/APMC.2016.7931439","DOIUrl":"https://doi.org/10.1109/APMC.2016.7931439","url":null,"abstract":"In this article, a hybrid combination of two resonating structures, one Cylindrical Dielectric Resonator Antenna (CDRA) and a modified slot geometry along with some more additional defects in ground plane (GP) has been proposed. Multiple resonances of the combination offer wide bandwidth over the complete X - band. A U-shaped microstrip feed is also incorporated in the proposed structure. The proposed design offers large impedance bandwidth (measured) about 45 % (S11 < −10 dB) and a peak gain of about 4.5 dBi. Some hybrid modes of CDRA are also excited and addressed in the proposed structure.","PeriodicalId":166478,"journal":{"name":"2016 Asia-Pacific Microwave Conference (APMC)","volume":"13 33","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120925110","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 : 2016-12-01DOI: 10.1109/APMC.2016.7931338
A. M. Alexandrin, S. V. Polenga, A. V. Stankovsky, A. D. Nemshon, Y. A. Litinskaya, A. D. Hudonogova, Y. Salomatov
The results of simulation and experimental study of the Ku-band antenna array element based on Fabry-Perot cavity (FPC) are presented in the article. The FPC is implemented as double-layered subwavelength FSS acting as partially reflecting surface (PRS). The matching element in form of a dielectric pyramid is presented. The reflection coefficient of fabricated prototype is below −10 dB within the operating frequency band. The gain of the prototype exceeds 18.7 dBi within a range of 12–12.7 GHz. The frequency band at −3 dB from maximum gain level is 9%. The presented array element can be used in high efficient arrays for satellite communications and television.
{"title":"Ku-band antenna array element based on Fabry-Perot cavity","authors":"A. M. Alexandrin, S. V. Polenga, A. V. Stankovsky, A. D. Nemshon, Y. A. Litinskaya, A. D. Hudonogova, Y. Salomatov","doi":"10.1109/APMC.2016.7931338","DOIUrl":"https://doi.org/10.1109/APMC.2016.7931338","url":null,"abstract":"The results of simulation and experimental study of the Ku-band antenna array element based on Fabry-Perot cavity (FPC) are presented in the article. The FPC is implemented as double-layered subwavelength FSS acting as partially reflecting surface (PRS). The matching element in form of a dielectric pyramid is presented. The reflection coefficient of fabricated prototype is below −10 dB within the operating frequency band. The gain of the prototype exceeds 18.7 dBi within a range of 12–12.7 GHz. The frequency band at −3 dB from maximum gain level is 9%. The presented array element can be used in high efficient arrays for satellite communications and television.","PeriodicalId":166478,"journal":{"name":"2016 Asia-Pacific Microwave Conference (APMC)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120965070","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 : 2016-12-01DOI: 10.1109/APMC.2016.7931450
Rajiv Panigrahi, K. Vinoy, M. J. Thomas
Serpentine folded waveguide travelling wave tube (TWT) is designed and fabricated using photo chemical etching of thin copper sheets which are stacked in a jig cavity to realize the complete circuit with flanges and beam hole. Cold parameters and beam wave interactions are studied using HFSS and CST Particle in Cell simulations, respectively. Peak power of 10W is achieved for an input power of 100mW for a 60mm long circuit at 95 GHz. Saturation Gain of 35 dB is achieved for entire W-band (87 – 96 GHz) for this circuit.
{"title":"A low cost approach for realization of W band folded waveguide travelling wave tube","authors":"Rajiv Panigrahi, K. Vinoy, M. J. Thomas","doi":"10.1109/APMC.2016.7931450","DOIUrl":"https://doi.org/10.1109/APMC.2016.7931450","url":null,"abstract":"Serpentine folded waveguide travelling wave tube (TWT) is designed and fabricated using photo chemical etching of thin copper sheets which are stacked in a jig cavity to realize the complete circuit with flanges and beam hole. Cold parameters and beam wave interactions are studied using HFSS and CST Particle in Cell simulations, respectively. Peak power of 10W is achieved for an input power of 100mW for a 60mm long circuit at 95 GHz. Saturation Gain of 35 dB is achieved for entire W-band (87 – 96 GHz) for this circuit.","PeriodicalId":166478,"journal":{"name":"2016 Asia-Pacific Microwave Conference (APMC)","volume":"149 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116053219","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 : 2016-12-01DOI: 10.1109/APMC.2016.7931366
H. Kumar, G. Kumar
In this paper, an inverted suspended microstrip antenna array with ratrace comparator at X-band for monopulse tracking radar applications has been designed and simulated using IE3D software based on method of moments (MoM). The radiating part of the monopulse antenna consists of hybrid feeding technique to achieve better side lobe level and high gain. The bandwidth of 8.6% has been achieved for VSWR < 2 from 8.96 GHz to 9.76 GHz. The maximum gain of 25.1 dB has been achieved with approximately 1 dB variations over the entire bandwidth. The sum radiation pattern shows a side lobe level of better than 17.5 dB in both azimuth as well as elevation planes. The difference radiation pattern shows a null depth of better than 28 dB. The radiation pattern is symmetric with HPBW of 6.3° and 7.1° in azimuth and elevation planes, respectively.
{"title":"An inverted suspended microstrip antenna array integrated with ratrace comparator at X-Band for monopulse tracking","authors":"H. Kumar, G. Kumar","doi":"10.1109/APMC.2016.7931366","DOIUrl":"https://doi.org/10.1109/APMC.2016.7931366","url":null,"abstract":"In this paper, an inverted suspended microstrip antenna array with ratrace comparator at X-band for monopulse tracking radar applications has been designed and simulated using IE3D software based on method of moments (MoM). The radiating part of the monopulse antenna consists of hybrid feeding technique to achieve better side lobe level and high gain. The bandwidth of 8.6% has been achieved for VSWR < 2 from 8.96 GHz to 9.76 GHz. The maximum gain of 25.1 dB has been achieved with approximately 1 dB variations over the entire bandwidth. The sum radiation pattern shows a side lobe level of better than 17.5 dB in both azimuth as well as elevation planes. The difference radiation pattern shows a null depth of better than 28 dB. The radiation pattern is symmetric with HPBW of 6.3° and 7.1° in azimuth and elevation planes, respectively.","PeriodicalId":166478,"journal":{"name":"2016 Asia-Pacific Microwave Conference (APMC)","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115641864","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 : 2016-12-01DOI: 10.1109/APMC.2016.7931268
G. Jawad, C. Duff, R. Sloan
This paper presents a waveguide isolator working in the Q-band by utilising the gyroelectric effects of magnetised semiconductors. After developing an exact mathematical approach for analysing a rectangular waveguide loaded with layered media, the complex propagation constants for a WR-22 waveguide loaded with an Indium Antimonide (InSb) slab at 77 K are calculated. It is found that the structure exhibits strong nonreciprocity for a range of frequencies when the InSb is biased with a specific D.C. magnetic flux. This behaviour is then utilised to design an isolator working at 48 GHz by magnetically biasing the InSb with a D.C. magnetic flux of 0.6 T. Next, the performance of this isolator is verified via simulation and measurements, and both resulted in more than 21 dB isolation at the frequency of operation. Unlike classical ferrite nonreciprocal devices, the operation of the gyroelectric devices can be extended up to the THz frequency ranges. This potential is demonstrated here by proposing another isolator to work at 143 GHz by loading a 4 mm long WR-06 waveguide with InSb slab at 77 K, and biasing it with a magnetic flux of 0.15 T. Simulation results show more than 30 dB isolation at the frequency of operation, which prove the advantages of utilising the gyroelectric effects in designing compact millimetre and sub-millimetre wave waveguide isolators.
{"title":"A Q-band gyroelectric waveguide isolator","authors":"G. Jawad, C. Duff, R. Sloan","doi":"10.1109/APMC.2016.7931268","DOIUrl":"https://doi.org/10.1109/APMC.2016.7931268","url":null,"abstract":"This paper presents a waveguide isolator working in the Q-band by utilising the gyroelectric effects of magnetised semiconductors. After developing an exact mathematical approach for analysing a rectangular waveguide loaded with layered media, the complex propagation constants for a WR-22 waveguide loaded with an Indium Antimonide (InSb) slab at 77 K are calculated. It is found that the structure exhibits strong nonreciprocity for a range of frequencies when the InSb is biased with a specific D.C. magnetic flux. This behaviour is then utilised to design an isolator working at 48 GHz by magnetically biasing the InSb with a D.C. magnetic flux of 0.6 T. Next, the performance of this isolator is verified via simulation and measurements, and both resulted in more than 21 dB isolation at the frequency of operation. Unlike classical ferrite nonreciprocal devices, the operation of the gyroelectric devices can be extended up to the THz frequency ranges. This potential is demonstrated here by proposing another isolator to work at 143 GHz by loading a 4 mm long WR-06 waveguide with InSb slab at 77 K, and biasing it with a magnetic flux of 0.15 T. Simulation results show more than 30 dB isolation at the frequency of operation, which prove the advantages of utilising the gyroelectric effects in designing compact millimetre and sub-millimetre wave waveguide isolators.","PeriodicalId":166478,"journal":{"name":"2016 Asia-Pacific Microwave Conference (APMC)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124914261","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 : 2016-12-01DOI: 10.1109/APMC.2016.7931431
V. Vanukuru, R. Groves
This paper describes the effects of substrate resistivity on bondpad parasitic capacitance and resistance. An accurate bondpad model with an embedded substrate model is presented which captures the effects of substrate resistivity variation. Simulated and measured results show as much as a 50% variation in effective bondpad capacitance with varying substrate resistivity. The scalability and broadband characteristics of the model are demonstrated with the achieved model to hardware correlation.
{"title":"An accurate scalable and broadband bondpad compact model for GHz RFIC designs","authors":"V. Vanukuru, R. Groves","doi":"10.1109/APMC.2016.7931431","DOIUrl":"https://doi.org/10.1109/APMC.2016.7931431","url":null,"abstract":"This paper describes the effects of substrate resistivity on bondpad parasitic capacitance and resistance. An accurate bondpad model with an embedded substrate model is presented which captures the effects of substrate resistivity variation. Simulated and measured results show as much as a 50% variation in effective bondpad capacitance with varying substrate resistivity. The scalability and broadband characteristics of the model are demonstrated with the achieved model to hardware correlation.","PeriodicalId":166478,"journal":{"name":"2016 Asia-Pacific Microwave Conference (APMC)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115182257","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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