High quality LTCC resonator for voltage-controlled oscillator

Prochazka, T.; Fischer, M.; Gruber, Bernd; Männer, Ruth; Matz, R.; Walter, Steffen

doi:10.1109/tcapt.2003.817651

Cited by 10 publications

(5 citation statements)

References 7 publications

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“…Recently, the RF floated-body technique is applied to improve the power handling capability of the CMOS T/R switch [4]. As the trend of converging multiple communication standards in a single system is emerging, it is in great demand to design a broadband T/R switch simultaneously achieving low insertion loss and high power handling capability [5,6]. In this work, we propose two designs of RF T/R switches implemented in 0.18-lm CMOS technology for broadband applications.…”

Section: Experiments Resultsmentioning

confidence: 99%

“…Article [4] presents a SIP approach for synthesizer system module using low-temperature cofired ceramic (LTCC). Recently, the use of LTCC in RF-circuit design has been reported successfully, and LTCC substrate allows a higher degree of integration and the RF signal integrity is less intact [5]. LTCC technology as a high-integration and three-dimension (3D) multilayer packaging technology brings a bran-new design conception and methods into the domain of traditional microwave-and millimeter-wave circuits.…”

Section: Introductionmentioning

confidence: 99%

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A Ka‐band frequency synthesizer using LTCC technology

Zhan

Qiu

Yang

et al. 2009

Micro & Optical Tech Letters

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This article is dedicated to the research on a Ka-band frequency synthesizer based on low-temperature cofired ceramics (LTCC) technology. This module is composed of an X-band phase locked loop (PLL) frequency synthesizer and a millimeter-wave quadrupler. In this design, all devices and filters which buried in the substrate are in the same Ferro-A6M LTCC board. Measurements show that the Ka-band LTCC frequency synthesizer covers 34.8-35.2 GHz with a minimal step of 40 MHz, low-phase noise (<À83 dBc/Hz @1 kHz), low-spurious level (À62 dBc), fast-hopping time (<15us). The board size is 33 cm 2 . So far as we know, this is the first time to realize a LTCC frequency synthesizer module on a single LTCC board in millimeter wave band.

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Section: Experiments Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Ka‐band frequency synthesizer using LTCC technology

Zhan

Qiu

Yang

et al. 2009

Micro & Optical Tech Letters

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“…The via holes are normally filled, often with silver, and then thick film processing is used to print metallization patterns on each, or selected tapes. When thick film processing is used, the minimum line width/gap is around 100 µm [75]. The different layers are then inspected, registered and laminated and then co-fired at around 850…”

Section: Standard Ltcc Processmentioning

confidence: 99%

Wide piezoelectric tuning of ltcc bandpass filters

Alahmad

Mäenner

Matz

et al. 2005

IEEE MTT-S International Microwave Symposium Digest, 2005.

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This work treats design and fabrication issues associated with innovative tunable front-end components which combine two different ceramic technologies, namely multilayer ceramic circuit boards (low temperature cofired ceramics or LTCC) and piezoelectric actuator technology within a single device. The need for such components is particularly arising due to the increasing number of wireless services and associated frequency bands in the range between 0.5 and 2.5 GHz. This has led in the past to the concept of software-defined radio (SDR) which would provide a cost-efficient solution by treating signals digitally and software-controlled up to the highest possible frequencies and as close as possible towards the transmit antenna, while the final analogue section at the antenna comprises only few high-performing and frequencyagile, tunable components. However, as a consequence of demanding component specifications, SDR has not yet found noticeable application in consumer markets despite ongoing search for suitable device concepts and fabrication technologies.Similar to the known micro-electromechanical (MEMS) approaches for tuning and switching, this work presents a modified parallel plate capacitor with high-permittivity dielectric and piezoelectrically movable top electrode as a tuning element. Like in MEMS solutions, there is no tunable dielectric material required for tuning as for example paraelectric material, which would introduce additional losses. The proposed device therefore has the potential for a high quality factor. Contrasting MEMS, piezoelectric actuators exhibit proven reliability and lifetime. Also sticking of contact surfaces can be overcome by the actuator force. The size of the actuator in the order of several millimeters is not impedimental in the present context, since it compares well to the size of planar integrated filters in the frequency range mentioned.The vertical movement of the electrode opens an air gap above the dielectric film which allows for substantial lowering of the effective dielectric constant and capacitance. When applied as a shunt capacitor in a coupled microstrip lines LTCC bandpass filter, the center frequency of the filter is tuned from 1.1 GHz to 2.6 GHz (tunability of 135%) with 200 V control voltage and low insertion loss of value 4 dB (at zero-bias) to 2 dB (at the maximum bias). For a more compact size, one electrode of the piezoelectric element is simultaneously used as the center microstrip line of a filter employing three coupled lines. Its equivalent circuit has been used to explore the change of the capacitor parameters across the entire tuning range. The capacitor varied from 7 pF to 1.35 pF with a quality factor between 60 and 160. The quality factor could be improved by a factor of 7 when the metallization of the piezoelectric actuator, changes from 80 nm to 500 nm.This thesis discusses also the effects of tuning mechanism on the overall quality factor, return loss, insertion loss, and the relative bandwidth at the mid of the band as a function of ...

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“…Resonators have been widely used for oscillators [6,7] and filters [8]. Low loss, high-quality (Q) factor, and compact size have been considered as the important issues for the device implementations, in special, at millimeter-wave frequencies.…”

Section: Introductionmentioning

confidence: 99%

LTCC stripline resonator using embedded air cavities for millimeter wave applications

Lee

Park²

2008

Micro & Optical Tech Letters

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tennas and filters for all three cases. Figure 8(d) shows the measured S11 response from the FSH13 network analyzer. As can be seen, the hairpin and hybrid filter both use 1500 mm 2 of laminate and both have similar S11 responses. This would indicate that the hybrid filter could be used as an alternative to the hairpin. It should be noted that the patch antenna integrated with the filters, had a narrower bandwidth than the filters, thus the S11 responses measured in Figure 8(d) are dominated by the antenna. It is left for future work to investigate the performance of the filters with antennas that have broader band-widths. CONCLUSIONAs can be seen from Figures 4 -6, there is good agreement between the measured and simulated responses. Thus the empirical approach of designing a filter using the optimization features of software is validated. All filters were designed for five resonators, however, for the hybrid and folded cases, there is additional coupling between nonadjacent resonators. Thus intermediary resonators are partially bypassed, lowering the effective filter order, thus as seen in Figure 7 the hybrid and folded filter have reduced isolation and selectivity. The use of HTS materials results in resonators having higher Q factors. It is left to a later project to investigate the effect of HTS materials upon these filters however we expect the sidebands become unobservable and that the filter selectivity improves. ABSTRACT: A stripline T-resonator is designed and implemented in the LTCC substrate for millimeter wave applications. The loss-free aircavities are embedded at both side edges of the conducting strip in order to efficiently reduce the dielectric loss of the stripline structure. The resonator was implemented using 4-layer LTCC dielectrics. The fabricated stripline resonator with air cavities reveals Q-factor of 248 and total loss of 0.035 dB/mm at 34.7 GHz, and that is improved by 108% and 51%, respectively, compared to the conventional one. The proposed LTCC stripline resonator with the embedded air cavities can meet demands for low-loss millimeter-wave system-on-package (SoP) applications. Figure 8 (a) Hairpin filter integrated with Patch Antenna, (b) hybrid filter integrated with patch antenna, (c) folded filter integrated with patch antenna, (d) comparison of filters integrated with patch antennas 658

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High quality LTCC resonator for voltage-controlled oscillator

Cited by 10 publications

References 7 publications

A Ka‐band frequency synthesizer using LTCC technology

A Ka‐band frequency synthesizer using LTCC technology

Wide piezoelectric tuning of ltcc bandpass filters

LTCC stripline resonator using embedded air cavities for millimeter wave applications

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