Automatic, Calibrated and Accurate Measurement of S-Parameters in Climatic Chamber

Belda, Oscar Monerris; Caballero, Elena Díaz; Garnica, Julián O.; Boria, Vicente E.

doi:10.1109/lmwc.2015.2421330

Cited by 6 publications

(7 citation statements)

References 6 publications

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“…In fact, the electric responses of these three elements of the calkit were measured at each one of the target temperatures. Thereafter, these measurements are used to calibrate the responses of the four different filters by using a Matlab program, that allows to obtain the corrected measurement at each one of the temperatures following the procedure described in [38].…”

Section: A Set-up For Tests Under Atmospheric Pressure Conditionsmentioning

confidence: 99%

“…Content may change prior to final publication. Framework, obtaining a final value of 2200 ppm/ • C. Table 6 provides a comparative study of the results for the SIW, ADLS, ESIW and ESICL filter prototypes presented in this work, together with the results of a similar filter manufactured in WR42 rectangular waveguide [38], an ESIW filter presented in [36], and self-compensated SIW and AFSIW filters presented, respectively, in [35] and [36].…”

Section: Insertion Loss Analysismentioning

confidence: 99%

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Thermal Stability Analysis of Filters in Substrate Integrated Technologies Under Atmospheric Pressure and Vacuum Conditions

et al. 2020

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Substrate integrated (SI) technologies, either completely or partially filled with dielectric, as well as completely empty (i.e. without any dielectric material), have been object of intense research in the last years. Their performance in terms of losses, cost and size are midway between those of classical planar lines and rectangular waveguides. Many communication devices have already been successfully designed, manufactured and measured in all these SI technologies. But these measurements are mostly done at room temperature under atmospheric pressure conditions. However, the good results (in terms of low loss, profile and cost) of these novel technologies, especially the completely empty versions, close to the performance of the rectangular waveguide, make them a very good alternative for being used in small satellite payloads. Up to now, few attention has been given to the thermal analysis of these SI technologies, still missing a complete comparative study of these effects under both, atmospheric pressure and vacuum conditions. In this work the same filter is implemented on four different SI technologies (including completely and partially filled with dielectric, as well as empty-no dielectric-versions). The four filters are designed, manufactured, and measured at different temperatures according to the thermal testing standards for space applications. The thermal study is performed under atmospheric pressure conditions and, for the first time, under high vacuum conditions. Finally, a comparison with all previous available thermal studies (all of them performed at atmospheric pressure levels) is included. INDEX TERMS Cavities, empty substrate-integrated coaxial line (ESICL), empty substrate-integrated waveguide (ESIW), filters, microwave integrated circuits, payloads, rectangular waveguide, satellites, substrate integrated waveguide (SIW), space communications, substrate integrated circuits (SIC), thermal stability coefficient of thermal expansion (CTE).

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Section: A Set-up For Tests Under Atmospheric Pressure Conditionsmentioning

confidence: 99%

Section: Insertion Loss Analysismentioning

confidence: 99%

Thermal Stability Analysis of Filters in Substrate Integrated Technologies Under Atmospheric Pressure and Vacuum Conditions

et al. 2020

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“…Because of the strong push in digital communications for satellite and terrestrial applications, RF measurement technology has improved dramatically in recent years [86], [141]. Almost all signal analyzer available in the market today are able to capture the amplitude and phase information of an RF signal, known as IQ data.…”

Section: Discussionmentioning

confidence: 99%

“…The main contribution of this novel method is that, instead of calibrating the measurement using the VNA built-in routine, the calibration is performed after taking all the acquisitions within the temperature profile. Hence the approach is [141]:…”

Section: Operation Principlementioning

confidence: 99%

Advanced Techniques for Multipactor Testing

Belda¹

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ehexgih igrxsi py wvsegy isxq ysr wonerris feld hesis dvisorX hrF iente iF fori isert hesis oEdvisorX hrF fenito qimeno wrt¡ %nez hh hesis presented t niversitt olit eni de l eni leniD tnury PHPQ Abstract sn the reent pstD there hs een prolifertion of new stellite systemsD espeilly the lrge onstelltions in the vow irth yrits @viysAF xerly ll stellites now rry digitl tr0 with vriety of modultions nd power levelsF xot only thtD the usiness model requires rpid deployment of stellitesD putting enormous onstrints for the suppliers of mirowve pylod hrdwreF e key risk re for suh equipment remins the multiptor rekdown under moderte to high power levelsF ywing to the inherent rndomness of the multiptor phenomenonD ustomers tend to dd extr design mrgins for the high power mirowve omponentsF his results in higher ostsD ulkier devies nd longer time for testingF fsed on personl experiene in multiptor testingD the prime motivtor for the work desried in the thesis hs een to undertke omprehensive review of this phenomenon nd develop utting edge multiptor test pilitiesD providing mens for the rpid multiptor testing under vriety of wideEnd modulted signlsF he thesis disserttion shows tht nlog nd digitl modultions hve signi(nt impt in the multiptor thresholdF he short nd longEterm multiptor regimes re lso nlyzedD regimes thtD in some sesD hve very di'erent multiptor thresholds for the sme ritil gpF he need to redue the mirowve pylod weight y using multirriers in single trnsponder provides n exellent option for designersF fy routing severl signls through the sme devieD the pylod weight is drmtilly reduedF gommeril solutions for multirrier testing re not suitle euse of the high power levels requiredF everl strtegies to implement multiptor test enhes with ontrollle prmeters re presentedF esults prove tht the signl eing fed to the devie under tests is urte nd stle over timeF pinllyD novel multiptor detetion system is proposed to ope with multiptor detetion when modulted nd multirrier signls of ny ndwidth re usedF his method hs the sme sensitivity s the well known mirowve nulling for ontinuous wve signls nd surpsses it for modulted signlsF he digitl signl proessing used to detet the multiptor ptterns provides full utonomous detetion methodF Contents eknowledgments v esum vi

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“…The measurement setup was not calibrated before measuring the filters since the properties of the test bench can change with temperature. To address this, the standards of the calibration kits were also submitted to the thermal test, and the resulting measurements were used to calibrate the response of the two devices by following the procedure outlined in [129].…”

Section: Experimental Setup and Measurement Proceduresmentioning

confidence: 99%

Development of non-conventional microwave devices based on substrate-integrated technology for advanced applications

Nova Giménez

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Introduction 1.1 Motivation and Interest of the TopicThere has been a rapid transformation in communication systems in recent years, with a particular impact on satellite communications. The high demand for data throughput, bandwidth and ubiquitous connectivity is pushing microwave technology to its limits. This change is particularly evident in the space industry, where the business focus has shifted from large Geostationary Earth Orbit (GEO) satellites to constellations of numerous satellites operating in Low Earth Orbit (LEO). The concept of large LEO constellations is reminiscent of the ambitious global phone connectivity projects of the 1990s that include Iridium, Globalstar, and Odyssey. Most of these systems were ultimately cancelled due to their high costs or technological limitations, which led the new LEO systems to focus on reducing the cost per bit.In this evolving scenario, the feasibility of these new satellite systems heavily relies on the reduction of production, launching, and operation costs. Microwave devices used in these space communications systems must not only exhibit high performance and adaptability but also undergo a drastic reduction in weight, size, and price. These factors are crucial for the success and sustainability of the new generation of space communication systems, as highlighted by studies on large LEO constellations and industry reports [1,2].Different solutions can be applied to improve the performance and reduce the production cost and weight of the Radio Frequency (RF) front-ends. One notable solution is the Substrate Integrated Circuit (SIC) technology, which emerged in the late 1990s to address similar demands of the industry [3,4]. The SIC technology involves the integration of different waveguide topologies within a substrate stack-up, combining the benefits of planar transmission lines (e.g., microstrip, coplanar, and stripline) and non-planar technologies (e.g.,• Geostationary Earth Orbit (GEO) satellites orbit the Earth at an altitude of approximately 36 000 km [11]. At this altitude, satellites travel at the same rate as the Earth's rotation, making them appear stationary in the sky. This characteristic eliminates the need for complex tracking systems in the ground segment and enables near-continental coverage. A single GEO satellite can provide coverage from around 20 degrees north to 20 degrees south latitude [9]. Moreover, due to its high altitude, only three equally spaced GEO satellites are required to achieve quasi-global coverage. These characteristics make the GEO systems particularly suitable for broadcasting communications Substrate integrated technologiesThe integration of planar and non-planar circuits is a critical aspect of microwave and millimetre wave front-ends. Planar transmission lines (i.e., microstrip, coplanar waveguide, Empty Substrate Integrated Coaxial Line (ESICL) and Ridge Empty Substrate Integrated Waveguide (RESIW) that integrate coaxial lines and ridge waveguides in planar substrates.The significant interest in this technology has als...

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Automatic, Calibrated and Accurate Measurement of S-Parameters in Climatic Chamber

Cited by 6 publications

References 6 publications

Thermal Stability Analysis of Filters in Substrate Integrated Technologies Under Atmospheric Pressure and Vacuum Conditions

Thermal Stability Analysis of Filters in Substrate Integrated Technologies Under Atmospheric Pressure and Vacuum Conditions

Advanced Techniques for Multipactor Testing

Development of non-conventional microwave devices based on substrate-integrated technology for advanced applications

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