Pub Date : 2015-06-11DOI: 10.1109/COMITE.2015.7120332
V. Závodný, Petr Kopecký
The paper deals with a modeling and construction of a reflector antenna. Two electronically selected orthogonal antenna planes are realized due to orthogonally oriented ports at primary radiator. Ground clutter suppression is carried out thanks to narrow antenna beam width at elevation plane.
{"title":"Reflector antenna in L band","authors":"V. Závodný, Petr Kopecký","doi":"10.1109/COMITE.2015.7120332","DOIUrl":"https://doi.org/10.1109/COMITE.2015.7120332","url":null,"abstract":"The paper deals with a modeling and construction of a reflector antenna. Two electronically selected orthogonal antenna planes are realized due to orthogonally oriented ports at primary radiator. Ground clutter suppression is carried out thanks to narrow antenna beam width at elevation plane.","PeriodicalId":250220,"journal":{"name":"2015 Conference on Microwave Techniques (COMITE)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123809682","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 : 2015-04-22DOI: 10.1109/COMITE.2015.7120221
Elmine Botes, P. Meyer
This work presents a study on the tunability of popular coupled-line filter topologies. The study considers a Chebychev prototype and transforms it to commonly used coupled-line topologies, namely the staircase, interdigital, hairpin, and combline topologies. The filters are designed for X-band frequencies with a 10 GHz centre frequency and a 5 % bandwidth, and are modelled using ideal transmission lines in a circuit simulator. The study is focused on centre frequency tunability while maintaining a constant bandwidth and out-of-band attenuation. It is shown that the classical staircase topology offers the best balance between good centre frequency tunability and out-of-band attenuation in comparison with the hairpin, interdigital and combline filters.
{"title":"Tunability of commonly used coupled-line bandpass filter topologies","authors":"Elmine Botes, P. Meyer","doi":"10.1109/COMITE.2015.7120221","DOIUrl":"https://doi.org/10.1109/COMITE.2015.7120221","url":null,"abstract":"This work presents a study on the tunability of popular coupled-line filter topologies. The study considers a Chebychev prototype and transforms it to commonly used coupled-line topologies, namely the staircase, interdigital, hairpin, and combline topologies. The filters are designed for X-band frequencies with a 10 GHz centre frequency and a 5 % bandwidth, and are modelled using ideal transmission lines in a circuit simulator. The study is focused on centre frequency tunability while maintaining a constant bandwidth and out-of-band attenuation. It is shown that the classical staircase topology offers the best balance between good centre frequency tunability and out-of-band attenuation in comparison with the hairpin, interdigital and combline filters.","PeriodicalId":250220,"journal":{"name":"2015 Conference on Microwave Techniques (COMITE)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133054954","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 : 2015-04-22DOI: 10.1109/COMITE.2015.7120226
M. Taouzari, J. El aoufi, A. Mouhsen, H. Nasraoui, O. El Mrabat
A compact design of a circularly-polarized microstrip antenna in order to achieve dual-band behavior for Radio Frequency Identification (RFID) applications is presented, defected ground structure (DGS) technique is used to miniaturize and get a dual-band antenna, the entire size is 38×40×1.58 mm3. This antenna was designed to cover both ultra-height frequency (740MHz ~ 1GHz) and slow height frequency (2.35 GHz ~ 2.51GHz), return loss <; -10 dB, the 3-dB axial ratio bandwidths are about 110 MHz at the lower band (900 MHz).
{"title":"900 MHz and 2.45 GHz compact dual-band circularly-polarized patch antenna for RFID application","authors":"M. Taouzari, J. El aoufi, A. Mouhsen, H. Nasraoui, O. El Mrabat","doi":"10.1109/COMITE.2015.7120226","DOIUrl":"https://doi.org/10.1109/COMITE.2015.7120226","url":null,"abstract":"A compact design of a circularly-polarized microstrip antenna in order to achieve dual-band behavior for Radio Frequency Identification (RFID) applications is presented, defected ground structure (DGS) technique is used to miniaturize and get a dual-band antenna, the entire size is 38×40×1.58 mm3. This antenna was designed to cover both ultra-height frequency (740MHz ~ 1GHz) and slow height frequency (2.35 GHz ~ 2.51GHz), return loss <; -10 dB, the 3-dB axial ratio bandwidths are about 110 MHz at the lower band (900 MHz).","PeriodicalId":250220,"journal":{"name":"2015 Conference on Microwave Techniques (COMITE)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133245096","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 : 2015-04-22DOI: 10.1109/COMITE.2015.7120316
L. Dudás, L. Szűcs, A. Gschwindt
Our aim is to design and develop a PocketQube-class satellite as one possible continuation of Masat-1, the first Hungarian satellite. The planned payload of Smog-1 is an UHF band spectrum monitoring system. This system is able to measure the UHF band digital terrestrial TV signal levels around the world on a low Earth orbit as RF smog. The spectrum measurement system were flown by high altitude meteorological balloon.
{"title":"The spectrum monitoring system by Smog-1 satellite","authors":"L. Dudás, L. Szűcs, A. Gschwindt","doi":"10.1109/COMITE.2015.7120316","DOIUrl":"https://doi.org/10.1109/COMITE.2015.7120316","url":null,"abstract":"Our aim is to design and develop a PocketQube-class satellite as one possible continuation of Masat-1, the first Hungarian satellite. The planned payload of Smog-1 is an UHF band spectrum monitoring system. This system is able to measure the UHF band digital terrestrial TV signal levels around the world on a low Earth orbit as RF smog. The spectrum measurement system were flown by high altitude meteorological balloon.","PeriodicalId":250220,"journal":{"name":"2015 Conference on Microwave Techniques (COMITE)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127208966","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 : 2015-04-22DOI: 10.1109/COMITE.2015.7120324
I. Ju, Hong-gu Ji, I. Yom
In this paper, we present the GaAs PHEMT monolithic microwave integrated circuit (MMIC) high-power amplifier (HPA) with high efficiency and broadband. The HPA delivers 36 ~ 37dBm (4~5W) saturated output power with 28 ~ 31% power added efficiency (PAE) in the frequency band of 12 to 16 GHz, while providing 26~31 dB of small-signal gain and more than 42 dBm of output third-order intercept point (OIP3). This three-stage amplifier with chip size of 9.4mm2(4mm × 2.35mm) is designed to fully match 50-Ω input and output impedance.
{"title":"Ku-band GaAs MMIC high power amplifier with high efficiency and broadband","authors":"I. Ju, Hong-gu Ji, I. Yom","doi":"10.1109/COMITE.2015.7120324","DOIUrl":"https://doi.org/10.1109/COMITE.2015.7120324","url":null,"abstract":"In this paper, we present the GaAs PHEMT monolithic microwave integrated circuit (MMIC) high-power amplifier (HPA) with high efficiency and broadband. The HPA delivers 36 ~ 37dBm (4~5W) saturated output power with 28 ~ 31% power added efficiency (PAE) in the frequency band of 12 to 16 GHz, while providing 26~31 dB of small-signal gain and more than 42 dBm of output third-order intercept point (OIP3). This three-stage amplifier with chip size of 9.4mm2(4mm × 2.35mm) is designed to fully match 50-Ω input and output impedance.","PeriodicalId":250220,"journal":{"name":"2015 Conference on Microwave Techniques (COMITE)","volume":"9 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121898272","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 : 2015-04-22DOI: 10.1109/COMITE.2015.7120331
V. Brazda, O. Fiser
Exact modelling of free space optical link attenuation require information about current drop size distribution (DSD) of fog. Modified gamma distribution with three parameters is widely used to express the shape of fog DSD. ITU-R recommendation specifies two sets of the parameters according to two typical fog cases, heavy advection and moderate radiation fog. Some studies also estimate two parameters of the gamma distribution when the value of the third parameter is fixed. This study shows method for estimation of all the three parameters which are determined on basis of liquid water content, particle surface area and visibility. Method is implemented on real data measured at a mountain observatory.
{"title":"Estimation of fog drop size distribution based on meteorological measurement","authors":"V. Brazda, O. Fiser","doi":"10.1109/COMITE.2015.7120331","DOIUrl":"https://doi.org/10.1109/COMITE.2015.7120331","url":null,"abstract":"Exact modelling of free space optical link attenuation require information about current drop size distribution (DSD) of fog. Modified gamma distribution with three parameters is widely used to express the shape of fog DSD. ITU-R recommendation specifies two sets of the parameters according to two typical fog cases, heavy advection and moderate radiation fog. Some studies also estimate two parameters of the gamma distribution when the value of the third parameter is fixed. This study shows method for estimation of all the three parameters which are determined on basis of liquid water content, particle surface area and visibility. Method is implemented on real data measured at a mountain observatory.","PeriodicalId":250220,"journal":{"name":"2015 Conference on Microwave Techniques (COMITE)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126493410","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 : 2015-04-22DOI: 10.1109/COMITE.2015.7120327
L. Beran, P. Chmelar, L. Rejfek, J. Chum, Z. Mošna
This electronic document is about comparison of the methods and systems for the measurement of the ionosphere used at the geophysical observatory Pruhonice (50N, 14.5E). Three systems for ionospheric monitoring are installed at the station. The first system for the monitoring of the ionosphere is Digisonde, the second system is dual frequency GNSS receiver and the third system is continuous Doppler sounding. Each system has its benefits and weaknesses which are compared in this paper.
{"title":"Comparison of devices for monitoring of the ionosphere at the observatory Pruhonice","authors":"L. Beran, P. Chmelar, L. Rejfek, J. Chum, Z. Mošna","doi":"10.1109/COMITE.2015.7120327","DOIUrl":"https://doi.org/10.1109/COMITE.2015.7120327","url":null,"abstract":"This electronic document is about comparison of the methods and systems for the measurement of the ionosphere used at the geophysical observatory Pruhonice (50N, 14.5E). Three systems for ionospheric monitoring are installed at the station. The first system for the monitoring of the ionosphere is Digisonde, the second system is dual frequency GNSS receiver and the third system is continuous Doppler sounding. Each system has its benefits and weaknesses which are compared in this paper.","PeriodicalId":250220,"journal":{"name":"2015 Conference on Microwave Techniques (COMITE)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116920358","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 : 2015-04-22DOI: 10.1109/COMITE.2015.7120333
Petr Kopecký, V. Závodný
This article is focus on design and realization of measurement system for testing far-field patterns of phased array antennas. The task was a test and correction of the transmitting and receiving phased arrays antennas of high transmitting power in X-band. Such antenna and measurement system have been built and pattern properties of antenna has been tested with use this system.
{"title":"Measurement of far-field patterns of phased array antennas","authors":"Petr Kopecký, V. Závodný","doi":"10.1109/COMITE.2015.7120333","DOIUrl":"https://doi.org/10.1109/COMITE.2015.7120333","url":null,"abstract":"This article is focus on design and realization of measurement system for testing far-field patterns of phased array antennas. The task was a test and correction of the transmitting and receiving phased arrays antennas of high transmitting power in X-band. Such antenna and measurement system have been built and pattern properties of antenna has been tested with use this system.","PeriodicalId":250220,"journal":{"name":"2015 Conference on Microwave Techniques (COMITE)","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122501954","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 : 2015-04-22DOI: 10.1109/COMITE.2015.7120340
T. Zálabský, P. Bezousek, D. Matousek
The paper describes concept of the patch antenna array for X-band FMCW (Frequency Modulated Continuous Wave) radar. This antenna is part of a system for detection of obstacles in the near vicinity of a helicopter. The intended function of this system is to detect and inform the flight crew of obstacles while maneuvering at low airspeed typically close to the ground. The antenna works at center frequency 9.5 GHz with bandwidth of 450 MHz. The antenna is fabricated by microstrip technology. Since the broadband antenna is need, the antenna consists of two dielectric layers. The first layer consists of radiation elements (patches). The second layer has, on its top side, a ground plane and on the bottom side, a signal distribution network for a series-fed patch antenna array. Between these two layers is a gap which allows a required bandwidth to be achieved.
{"title":"Patch antenna array for X-band FMCW sensor: An antenna system for detection of obstacles in near vicinity of a helicopter","authors":"T. Zálabský, P. Bezousek, D. Matousek","doi":"10.1109/COMITE.2015.7120340","DOIUrl":"https://doi.org/10.1109/COMITE.2015.7120340","url":null,"abstract":"The paper describes concept of the patch antenna array for X-band FMCW (Frequency Modulated Continuous Wave) radar. This antenna is part of a system for detection of obstacles in the near vicinity of a helicopter. The intended function of this system is to detect and inform the flight crew of obstacles while maneuvering at low airspeed typically close to the ground. The antenna works at center frequency 9.5 GHz with bandwidth of 450 MHz. The antenna is fabricated by microstrip technology. Since the broadband antenna is need, the antenna consists of two dielectric layers. The first layer consists of radiation elements (patches). The second layer has, on its top side, a ground plane and on the bottom side, a signal distribution network for a series-fed patch antenna array. Between these two layers is a gap which allows a required bandwidth to be achieved.","PeriodicalId":250220,"journal":{"name":"2015 Conference on Microwave Techniques (COMITE)","volume":"58 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120973859","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 : 2015-04-22DOI: 10.1109/COMITE.2015.7120220
S. Nassar, P. Meyer, P. Van Der Walt
An S-band combline filter with improved passband separation is presented. The filter utilizes a perturbed housing to increase the capacitive end-loading of the resonators, thereby reducing the length and increasing the stop-band width. Different perturbations of the housing are investigated. A narrowband filter is constructed and measured.
{"title":"An S-band combline filter with reduced size and increased pass-band separation","authors":"S. Nassar, P. Meyer, P. Van Der Walt","doi":"10.1109/COMITE.2015.7120220","DOIUrl":"https://doi.org/10.1109/COMITE.2015.7120220","url":null,"abstract":"An S-band combline filter with improved passband separation is presented. The filter utilizes a perturbed housing to increase the capacitive end-loading of the resonators, thereby reducing the length and increasing the stop-band width. Different perturbations of the housing are investigated. A narrowband filter is constructed and measured.","PeriodicalId":250220,"journal":{"name":"2015 Conference on Microwave Techniques (COMITE)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114403284","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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