Pub Date : 2006-12-01DOI: 10.1109/APMC.2006.4429372
Sai‐Wai Wong, Sheng Sun, Lei Zhu, Zhi Ning Chen
A novel ultra-wideband (UWB) bandpass filter with improved upper-stopband performance is presented and constituted by integrating an initial UWB filter with two lowpass filters at its two sides. Firstly, a multiple-mode resonator is formed with first three resonant frequencies located within the 3.1-10.6 GHz UWB band while its two-side high-impedance sections are excited by two interdigital coupled lines with enhanced coupling degree, leading to make up an initial UWB filter. Secondly, two 3rd- or 5th-order lowpass filters are designed with their cut-off frequency slightly higher than 10.6 GHz (upper-end), aiming at suppressing the spurious upper-passband near the interested UWB passband. Finally, a resultant UWB bandpass filter is optimized, fabricated and measured to give us an evident confirmation on the improved upper-stopband performance.
{"title":"Ultra-wideband (UWB) bandpass filters with improved upper-stopband performance","authors":"Sai‐Wai Wong, Sheng Sun, Lei Zhu, Zhi Ning Chen","doi":"10.1109/APMC.2006.4429372","DOIUrl":"https://doi.org/10.1109/APMC.2006.4429372","url":null,"abstract":"A novel ultra-wideband (UWB) bandpass filter with improved upper-stopband performance is presented and constituted by integrating an initial UWB filter with two lowpass filters at its two sides. Firstly, a multiple-mode resonator is formed with first three resonant frequencies located within the 3.1-10.6 GHz UWB band while its two-side high-impedance sections are excited by two interdigital coupled lines with enhanced coupling degree, leading to make up an initial UWB filter. Secondly, two 3rd- or 5th-order lowpass filters are designed with their cut-off frequency slightly higher than 10.6 GHz (upper-end), aiming at suppressing the spurious upper-passband near the interested UWB passband. Finally, a resultant UWB bandpass filter is optimized, fabricated and measured to give us an evident confirmation on the improved upper-stopband performance.","PeriodicalId":137931,"journal":{"name":"2006 Asia-Pacific Microwave Conference","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133540704","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 : 2006-12-01DOI: 10.1109/APMC.2006.4429633
T. Ohno, Y. Ohno, K. Wada, O. Hashimoto
This paper presents an ultra- wideband (UWB) resonator and a bandpass filter (BPF) consisting of quasi- lumped elements using a microstrip line (MSL). First of all, a resonator using a high-impedance inductive line and a gap capacitor is examined by an electromagnetic simulator. The simulated results of the resonator show UWB bandpass characteristics with two controllable stop- bands by adjusting the element values and the length of the resonator. Secondly, an UWB-BPF using the presented resonator is proposed, fabricated, simulated and measured. It is confirmed that desired UWB bandpass characteristics are realized by controlling two stopband characteristics.
{"title":"A Class of UWB microstrip bandpass filter using quasi-lumped element resonators with controllable stopbands","authors":"T. Ohno, Y. Ohno, K. Wada, O. Hashimoto","doi":"10.1109/APMC.2006.4429633","DOIUrl":"https://doi.org/10.1109/APMC.2006.4429633","url":null,"abstract":"This paper presents an ultra- wideband (UWB) resonator and a bandpass filter (BPF) consisting of quasi- lumped elements using a microstrip line (MSL). First of all, a resonator using a high-impedance inductive line and a gap capacitor is examined by an electromagnetic simulator. The simulated results of the resonator show UWB bandpass characteristics with two controllable stop- bands by adjusting the element values and the length of the resonator. Secondly, an UWB-BPF using the presented resonator is proposed, fabricated, simulated and measured. It is confirmed that desired UWB bandpass characteristics are realized by controlling two stopband characteristics.","PeriodicalId":137931,"journal":{"name":"2006 Asia-Pacific Microwave Conference","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133430100","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 : 2006-12-01DOI: 10.1109/APMC.2006.4429575
D. Gray, M. Nagatsuka, R. Miura
A number of telecommunications experiments were flown on an autonomous, 68 metre non-rigid airship in November 2004. Although the digital television broadcast experiment was successful, it was found that the signal was occasionally entirely lost when the airship passed directly over one receiving station. The performance of the transmit helicial antenna is examined on a simple model of the airship gondola using a commercially available MOM software in attempt to identify features of the antenna that may have adversely affected the radiation pattern during the broadcast experiments. Two other types of helical antenna were also studied, and were found to potentially offer advantages in maintaining radiation pattern shape when installed on the gondola.
{"title":"Review of helices for DTV broadcast from HAPS prototype","authors":"D. Gray, M. Nagatsuka, R. Miura","doi":"10.1109/APMC.2006.4429575","DOIUrl":"https://doi.org/10.1109/APMC.2006.4429575","url":null,"abstract":"A number of telecommunications experiments were flown on an autonomous, 68 metre non-rigid airship in November 2004. Although the digital television broadcast experiment was successful, it was found that the signal was occasionally entirely lost when the airship passed directly over one receiving station. The performance of the transmit helicial antenna is examined on a simple model of the airship gondola using a commercially available MOM software in attempt to identify features of the antenna that may have adversely affected the radiation pattern during the broadcast experiments. Two other types of helical antenna were also studied, and were found to potentially offer advantages in maintaining radiation pattern shape when installed on the gondola.","PeriodicalId":137931,"journal":{"name":"2006 Asia-Pacific Microwave Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128888799","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 : 2006-12-01DOI: 10.1109/APMC.2006.4429430
Shu-Hui Yen, Yo‐Sheng Lin, Chi-Chen Chen
A low-power-consumption (26.93 mW) 32-GHz (Ka-band) low noise amplifier (LNA) using standard 0.18 mum CMOS technology is reported. To achieve sufficient gain, this LNA is composed of three cascaded common-source stages. The output of each stage is loaded with a band-pass (or a high-pass) combination of L and C to provide parallel resonance, i.e. to maximize the gain, at the design frequency. This LNA achieved input return loss (S11) of -13.3 dB, output return loss (S22) of -13.4 dB, forward gain (S21) of 10.2 dB, and reverse isolation (S12) of -19.1 dB at 32 GHz. This LNA consumed only a small dc power of 26.93 mW. The chip area is only 740 mum times 500 mum excluding the test pads.
{"title":"A Ka-band low noise amplifier using standard 0.18 μm CMOS technology for Ka-Bnad communication system applications","authors":"Shu-Hui Yen, Yo‐Sheng Lin, Chi-Chen Chen","doi":"10.1109/APMC.2006.4429430","DOIUrl":"https://doi.org/10.1109/APMC.2006.4429430","url":null,"abstract":"A low-power-consumption (26.93 mW) 32-GHz (Ka-band) low noise amplifier (LNA) using standard 0.18 mum CMOS technology is reported. To achieve sufficient gain, this LNA is composed of three cascaded common-source stages. The output of each stage is loaded with a band-pass (or a high-pass) combination of L and C to provide parallel resonance, i.e. to maximize the gain, at the design frequency. This LNA achieved input return loss (S11) of -13.3 dB, output return loss (S22) of -13.4 dB, forward gain (S21) of 10.2 dB, and reverse isolation (S12) of -19.1 dB at 32 GHz. This LNA consumed only a small dc power of 26.93 mW. The chip area is only 740 mum times 500 mum excluding the test pads.","PeriodicalId":137931,"journal":{"name":"2006 Asia-Pacific Microwave Conference","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127853643","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 : 2006-12-01DOI: 10.1109/APMC.2006.4429622
Xiaoguang Sun, Wei-zhao Li, Lei Ge
Spurious modes suppressions are compared between the dielectric-loaded cavity filters with cylindrical and rectangular structures in this paper. Using mode matching method, mode charts are computed to analyze that. The comparisons show that the cylindrical cavity filter has better spurious response. Also filter with cross-coupling is discussed, which has sharper out-of-band rejection. Three experimental filters are designed and the measured results have good agreement with the analysis.
{"title":"Dielectric loaded cavity filter with wide spurious free region and better out-of-band rejection","authors":"Xiaoguang Sun, Wei-zhao Li, Lei Ge","doi":"10.1109/APMC.2006.4429622","DOIUrl":"https://doi.org/10.1109/APMC.2006.4429622","url":null,"abstract":"Spurious modes suppressions are compared between the dielectric-loaded cavity filters with cylindrical and rectangular structures in this paper. Using mode matching method, mode charts are computed to analyze that. The comparisons show that the cylindrical cavity filter has better spurious response. Also filter with cross-coupling is discussed, which has sharper out-of-band rejection. Three experimental filters are designed and the measured results have good agreement with the analysis.","PeriodicalId":137931,"journal":{"name":"2006 Asia-Pacific Microwave Conference","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127246449","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 : 2006-12-01DOI: 10.1109/APMC.2006.4429753
T. Yun, Hyun-Suk Kim, T. Hyun, Sung-su Kwoun
In this paper, a stepped impedance resonator (SIR) bandpass filter using BST thin film as a tunable device has been discussed. For the analysis of relative dielectric constant of BST thin films, the BST interdigital capacitor (IDC) is fabricated with finger's width and gap of 10 mum and 5 mum, respectively, and the capacitance of IDC is 0.951 pF and the relative dielectric constant of BST thin film is 1,097 at 6 GHz. The tunable SIR bandpass filter using BST thin films is designed with coupling section of 22deg and tapped feeding and has been successfully demonstrated with the thickness of BST thin films of 500 mn on the MgO substrate. The center frequency of the tunable SIR bandpass filter is moved from 6.15 GHz to 6.29 GHz at 50 V bias with about 3% bandwidth.
{"title":"Tunable stepped impedance resonator bandpass filter using ferroelectric materials","authors":"T. Yun, Hyun-Suk Kim, T. Hyun, Sung-su Kwoun","doi":"10.1109/APMC.2006.4429753","DOIUrl":"https://doi.org/10.1109/APMC.2006.4429753","url":null,"abstract":"In this paper, a stepped impedance resonator (SIR) bandpass filter using BST thin film as a tunable device has been discussed. For the analysis of relative dielectric constant of BST thin films, the BST interdigital capacitor (IDC) is fabricated with finger's width and gap of 10 mum and 5 mum, respectively, and the capacitance of IDC is 0.951 pF and the relative dielectric constant of BST thin film is 1,097 at 6 GHz. The tunable SIR bandpass filter using BST thin films is designed with coupling section of 22deg and tapped feeding and has been successfully demonstrated with the thickness of BST thin films of 500 mn on the MgO substrate. The center frequency of the tunable SIR bandpass filter is moved from 6.15 GHz to 6.29 GHz at 50 V bias with about 3% bandwidth.","PeriodicalId":137931,"journal":{"name":"2006 Asia-Pacific Microwave Conference","volume":"2014 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127419952","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 : 2006-12-01DOI: 10.1109/APMC.2006.4429671
P. Rajanaronk, A. Namahoot, P. Akkaraekthalin
In this paper, a novel single-diode frequency doubler design method is proposed. The output fundamental frequency is suppressed by employing a lambda/2 feed-forward transmission line parallel with a diode instead of using balanced structure with two or more diodes. The deployment of feed-forward line reduces the complexity of matching circuit and the circuit is more compact than doubler circuit without feed-forward line. A single-diode frequency doubler design technique is fully described in detail. The circuit is then fabricated and measured for the performances. The measurement results of 1.2/2.4 GHz frequency doubler agree very well with the simulated performances and exhibit 7.8 dB conversion loss with 170 MHz or 14.12% operating bandwidth.
{"title":"A single-diode frequency doubler using a feed-forward technique","authors":"P. Rajanaronk, A. Namahoot, P. Akkaraekthalin","doi":"10.1109/APMC.2006.4429671","DOIUrl":"https://doi.org/10.1109/APMC.2006.4429671","url":null,"abstract":"In this paper, a novel single-diode frequency doubler design method is proposed. The output fundamental frequency is suppressed by employing a lambda/2 feed-forward transmission line parallel with a diode instead of using balanced structure with two or more diodes. The deployment of feed-forward line reduces the complexity of matching circuit and the circuit is more compact than doubler circuit without feed-forward line. A single-diode frequency doubler design technique is fully described in detail. The circuit is then fabricated and measured for the performances. The measurement results of 1.2/2.4 GHz frequency doubler agree very well with the simulated performances and exhibit 7.8 dB conversion loss with 170 MHz or 14.12% operating bandwidth.","PeriodicalId":137931,"journal":{"name":"2006 Asia-Pacific Microwave Conference","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127524527","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 : 2006-12-01DOI: 10.1109/APMC.2006.4429393
T. Oka, M. Hirata, Y. Ishimaru, H. Kawamura, K. Sakuno
This paper describes a SiGe HBT power amplifier with distortion-controllable bias circuits. MOSFETs employed in the bias circuits enable us to control the distortion of power amplifiers by adjusting the gate voltages. The power amplifier MMIC for 802.11lg wireless LANs fabricated using the technique exhibited excellent linearity and efficiency: a linear output power of 18.3 dBm and a power-added efficiency of 16% were achieved at an EVM of 3%, measured with 54 Mbps 64-QAM OFDM signals at 2.45 GHz.
{"title":"SiGe HBT power amplifier with distortion-controllable bias circuit and its application to 802.11g wireless LANs","authors":"T. Oka, M. Hirata, Y. Ishimaru, H. Kawamura, K. Sakuno","doi":"10.1109/APMC.2006.4429393","DOIUrl":"https://doi.org/10.1109/APMC.2006.4429393","url":null,"abstract":"This paper describes a SiGe HBT power amplifier with distortion-controllable bias circuits. MOSFETs employed in the bias circuits enable us to control the distortion of power amplifiers by adjusting the gate voltages. The power amplifier MMIC for 802.11lg wireless LANs fabricated using the technique exhibited excellent linearity and efficiency: a linear output power of 18.3 dBm and a power-added efficiency of 16% were achieved at an EVM of 3%, measured with 54 Mbps 64-QAM OFDM signals at 2.45 GHz.","PeriodicalId":137931,"journal":{"name":"2006 Asia-Pacific Microwave Conference","volume":"520 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115508247","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 : 2006-12-01DOI: 10.1109/APMC.2006.4429800
R. Chayono, M. Haneishi, Y. Kimura
A novel printed monopole antenna for UWB applications is presented in this paper. A monopole with a combination of a half-disk and an inverted triangle is installed on a finite ground plane. A slit on the ground plane performs as an impedance controller to obtain matching over wide frequency range. Impedance bandwidth of more than 1:6 is achieved with VSWR<2. Omni-directional patterns are confirmed by simulation and experiments as well. Excellent gain performance is also achieved by the proposed antenna.
{"title":"Inverted triangle printed monopole antenna with halfdisk for UWB applications","authors":"R. Chayono, M. Haneishi, Y. Kimura","doi":"10.1109/APMC.2006.4429800","DOIUrl":"https://doi.org/10.1109/APMC.2006.4429800","url":null,"abstract":"A novel printed monopole antenna for UWB applications is presented in this paper. A monopole with a combination of a half-disk and an inverted triangle is installed on a finite ground plane. A slit on the ground plane performs as an impedance controller to obtain matching over wide frequency range. Impedance bandwidth of more than 1:6 is achieved with VSWR<2. Omni-directional patterns are confirmed by simulation and experiments as well. Excellent gain performance is also achieved by the proposed antenna.","PeriodicalId":137931,"journal":{"name":"2006 Asia-Pacific Microwave Conference","volume":"150 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124185125","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 : 2006-12-01DOI: 10.1109/APMC.2006.4429474
A. Abuelmaatti, I. Thayne, I. McGregor, E. Wasige
This work reports on a new implementation of a transistor model aiming for closer understanding of the nonlinear elements in silicon CMOS transistors operating at high frequencies. Using this model, the contribution of each source of distortion can be individually quantified using a superposition method. The new model is implemented entirely using symbolically defined devices (SDD) for each nonlinear parameter individually. The transistor used is a foundry 180nm RF CMOS transistor capable of operating up to 10GHz. The SDD model is validated by examining the nonlinear behavior of the model against the behavior of the modeled transistor in a one tone sweep test from very small powers up to beyond compression. This work was carried out using Agilent design systems tool (ADS).
{"title":"A new implemenation for RF SiCMOS transistor model using SDD for quantifying individual contribution to distortion from transistor’s nonlinear parameters","authors":"A. Abuelmaatti, I. Thayne, I. McGregor, E. Wasige","doi":"10.1109/APMC.2006.4429474","DOIUrl":"https://doi.org/10.1109/APMC.2006.4429474","url":null,"abstract":"This work reports on a new implementation of a transistor model aiming for closer understanding of the nonlinear elements in silicon CMOS transistors operating at high frequencies. Using this model, the contribution of each source of distortion can be individually quantified using a superposition method. The new model is implemented entirely using symbolically defined devices (SDD) for each nonlinear parameter individually. The transistor used is a foundry 180nm RF CMOS transistor capable of operating up to 10GHz. The SDD model is validated by examining the nonlinear behavior of the model against the behavior of the modeled transistor in a one tone sweep test from very small powers up to beyond compression. This work was carried out using Agilent design systems tool (ADS).","PeriodicalId":137931,"journal":{"name":"2006 Asia-Pacific Microwave Conference","volume":"216 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124264551","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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