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ABSTRACT: A stripline T-resonator is designed and implemented in the LTCC substrate for millimeter wave applications. The loss-free air cavities 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. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 658–661, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23151
Microwave and Optical Technology Letters 01/2008; 50(3):658 - 661. · 0.62 Impact Factor
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ABSTRACT: This paper demonstrates a low loss fully embedded multilayer bandpass filter (BPF) using low-temperature cofired ceramic (LTCC) technology for 3-D integration of 40-GHz multimedia wireless system (MWS) radio. The LTCC filter implemented in a stripline configuration occupies an area of only 5.5 times 2.3 times 0.6 mm including shielding structure and coplanar waveguide (CPW) transitions. The measured insertion loss was as small as 1.9 dB at a center frequency of 41.8 GHz, and the return loss was 12.2 dB including the loss associated with two CPW-to-stripline transitions. This six-layer BPF showed 3-dB bandwidth of 10.5% from 39.6 to 44.0 GHz at a center frequency of 41.8 GHz and suppressed the local oscillator (LO) signal to 20.2 dB at a local oscillator frequency of 38.8 GHz, making it suitable for the 40 GHz MWS applications.
IEEE Transactions on Advanced Packaging 09/2007; · 1.12 Impact Factor
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ABSTRACT: In this paper, a compact and low-radiation coplanar waveguide lines (CPW) probe pad using vialess conductor-backed coplanar waveguide (CBCPW)-to-microstrip transitions is presented for V-band low-temperature cofired ceramic (LTCC) applications. To reduce the radiation loss due to open-end and transition discontinuities, a vialess CBCPW structure with a edge cut back is proposed. The back pad and an optimum transition length suppress the radiation loss of the standard CPW probe pad by 30% and 10%, respectively, compared to a conventional vialess transition. In particular, at 66 GHz, radiation is completely suppressed for the proposed transition and its insertion loss is 0.15 dB at that frequency.
IEEE Transactions on Advanced Packaging 09/2007; · 1.12 Impact Factor
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ABSTRACT: A 10 × 21 × 1 mm3, very compact low temperature cofired ceramic (LTCC) system-in-package (SiP) transmitter module is presented for future wireless terminal applications. Five GaAs monolithic microwave integrated circuits (MMIC) chipsets including a power amplifier, driver amplifier, mixer, and two frequency multipliers are integrated into a LTCC multilayer circuit for the heterodyne transmitter. The fabricated transmitter module achieves an output of 13 dBm at a RF frequency of 62 GHz, an IF frequency of 2.4 GHz, and an local oscillator frequency of 59.6 GHz. The up-conversion gain is 11 dB; while the local oscillator signal is suppressed below −20.6 dBc with the image rejection mixer, and the image and spurious signals are also suppressed below −29.6 dBc. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 575–578, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22211
Microwave and Optical Technology Letters 02/2007; 49(3):575 - 578. · 0.62 Impact Factor
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ABSTRACT: In this paper, a novel LTCC stripline (SL) 60-GHz band-pass filter (BPF) composed of transitions to coplanar waveguide (CPW) pads for monolithic microwave integrated circuit integration is presented. For low-loss interconnection with active devices, a CPW-to-SL vertical via transition integrating air cavities and a CPW-to-CPW planar transition using internal ground planes are proposed and implemented. The fabricated transition shows an insertion loss of 1.6 dB and a reflection loss below -20 dB at the passband of the filter. The implemented SL BPF using dual-mode patch resonators shows a center frequency of 60.4 GHz, 3.5 % bandwidth, and reflection losses below -15 dB at the passband. Excluding the insertion loss of the transitions, the filter insertion loss reveals 4.0 dB
IEEE Transactions on Advanced Packaging 12/2006; · 1.12 Impact Factor
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ABSTRACT: Compact and low-radiation CPW probe pads using CBCPW-to-microstrip transitions are demonstrated for V-band LTCC applications. To reduce the radiation loss due to open-end and transition discontinuities, a vialess CBCPW and back pad are designed. The back pad and an optimum transition length suppress the radiation loss due to discontinuities by 30 and 10 %, respectively, compared to a conventional vialess transition. In particular, the radiation loss of the designed transition is suppressed completely at 66 GHz and its S21 is -0.15 dB at that frequency
Microwave Conference, 2006. 36th European; 10/2006
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ABSTRACT: We present a novel LTCC CPW-to-stripline (SL) vertical via transition utilizing a novel stagger via (STV) structure and embedded air cavities for 60 GHz system-in-package (SiP) applications. In order to minimize radiation due to abrupt via discontinuity, the STV structure and the air cavities are proposed and implemented in the vertical via transition. The fabricated three-segment transmission line (CPW-SL-CPW) composed of the new vertical via transitions achieves an insertion loss of 1.6 dB and return losses below -10 dB over 60 GHz. The transition loss per STV transition is 0.7 dB at 60 GHz.
Microwave Conference Proceedings, 2005. APMC 2005. Asia-Pacific Conference Proceedings; 01/2006
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ABSTRACT: We demonstrate a 36 times 12 times 0.9mm<sup>3</sup> sized compact monolithic LTCC SiP transmitter (Tx) for 60GHz-band wireless communication terminal applications. Five GaAs MMICs including mixer, driver amplifier, power amplifier and two of frequency doublers have been integrated onto LTCC multilayer circuit which embeds a stripline BPF and a microstrip patch antenna. A novel CPW-to-stripline transition has been devised integrating air-cavities to minimize the associated attenuation. The fabricated transmitter achieves an output of 9dBm at a RF frequency of 60.4GHz, an IF frequency of 2.4GHz, and a LO frequency of 58GHz. The up-conversion gain is 11.2dB; while the LO signal is suppressed below 33.4dBc, and the spurious signal is also suppressed below 27.4dBc. This is the first report on the LTCC SiP transmitter integrating both a BPF and an antenna. A 60 GHz communication was demonstrated
Microwave Symposium Digest, 2005 IEEE MTT-S International; 07/2005
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ABSTRACT: We present a new LTCC stripline (SL) structured 60 GHz bandpass filter (BPF) composed of transitions to CPW pads for MMIC integration. The possible loss through the SL-CPW transition has been minimized by adopting air-cavities below the via and by gradual approaching the height of the ground planes. The fabricated transition reveals an insertion loss of 1.6dB and a S11/S22 below -20dB at the pass band of the filter. The dual-mode four-pole BPF shows a center frequency of 60.4GHz, 3.5% bandwidth, and S11/S22 below -15dB at the pass band. Excluding the insertion loss of the transitions, the filter insertion loss reveals 3.67dB.
Microwave Symposium Digest, 2005 IEEE MTT-S International; 07/2005
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ABSTRACT: A 60GHz-band transmitter system-in-package (SiP) has been developed for future wireless communications applications. GaAs MMIC chipsets including a power amplifier, a driver amplifier, a mixer, and multipliers have been integrated on a LTCC multi-layer circuit for the heterodyne transmitter. The size of the whole transmitter LTCC module is 10mm × 21mm × 1mm. With an IF frequency of 2.4GHz and a LO frequency of 58GHz, 60.4GHz output of 11dBm is achieved, and the total gain is 12 dB. The link test for a 60GHz wireless communication shows that the transmitter communicates well with the receiver without any signal distortion.
Compound Semiconductor Integrated Circuit Symposium, 2004. IEEE; 11/2004
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ABSTRACT: We demonstrate a 2.1 X 1.0 X 0.1cm 3 sized compact transmitter using LTCC System-in-Package (SiP) technology for 60GHz-band wireless communication applications. For low-attenuation characteristics and resonance suppression of the SiP, we have proposed and demonstrated a coplanar double wire-bond transition and novel CPW-to-stripline transition integrating air-cavities as well as novel air-cavities embedded CPW line. The fabricated transmitter achieves an output of 13dBm at a RF frequency of 62GHz, an IF frequency of 2.4GHz, and a LO frequency of 59.6GHz. The up-conversion gain is 11dB, while the LO signal is suppressed with the image rejection mixer below -21.4dBc, and the image and spurious signals are also suppressed below –31dBc.
08/2004;
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ABSTRACT: We have implemented a novel high-Q low temperature co-fired ceramic (LTCC) stripline resonator by including air cavities in the LTCC substrate for millimeter-wave applications. This new resonator presents Q-factor of 290 and total loss of 0.03 dB/mm at 34.8 GHz, and they are improved by 138% and 58%, respectively, compared to the conventional one. Its dielectric loss is analyzed as small as 0.0003 dB/mm at the resonant frequency, and that improved by a factor of 120 compared to the conventional one.
IEEE Microwave and Wireless Components Letters 01/2004; · 1.72 Impact Factor
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ABSTRACT: A compact multilayer capacitor cell isolated with perforated ground was designed and fabricated using low-temperature ceramic co-firing (LTCC) technology for three-dimensional (3D) RF circuit application. The vertical transmission from any interferer placed 114 μm above the capacitor cell and the lateral transmission from any interferer 300 μm apart from the cell were controlled below −20 dB up to 15 GHz. The 2.8-pF capacitor shielded with perforated ground of 600-μm square edge and 800-μm pitch revealed a self-resonant frequency (SRF) of 7.6 GHz and Q factor of over 190 up to 3 GHz, which is an improvement of SRF by 0.8 GHz and Q factor by 224%, compared to the capacitor with a conventional blanket ground. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 484–486, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11096
Microwave and Optical Technology Letters 07/2003; 38(6):484 - 486. · 0.62 Impact Factor
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ABSTRACT: We have designed and implemented an innovative low-loss and high-Q millimeter-wave stripline resonator by including air cavities in the LTCC substrate between the ground planes. Measurements of a stripline resonator with air cavities above and below the conducting strip reveal Q-factor of 290 and total loss of 0.03dB/mm at 34.8GHz, and they are improved by 138% and 58%, respectively compared to the conventional LTCC stripline resonator. The dielectric loss of this resonator is analyzed as small as 0.0003dB/mm at the resonant frequency, and that is equivalent to an improvement of a factor of 120 compared to the conventional one. The proposed stripline resonator with the embedded air cavities can meet demands for low-loss millimeter-wave MCM applications.
Microwave Symposium Digest, 2003 IEEE MTT-S International; 07/2003
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ABSTRACT: A compact and broadband MMIC power amplifier operating from 18 GHz to 35 GHz is developed for K- through Ka-band applications implementing a rigorous electromagnetic (EM) simulation of closely spaced matching networks. The EM simulation results in a compact chip size as small as 2.16 mm × 2.0 mm and isolations of less than -25 dB up to 40 GHz between neighboring distributed structures. The two-stage balanced power amplifier fabricated using a 0.25 µm AlGaAs/InGaAs/GaAs PHEMT technology has an average gain of 11 dB, return losses less than -10 dB, and P1 dB above 20.5 dBm from 18 GHz to 35 GHz. This compact and broadband MMIC power amplifier is suited for power amplifiers for most K through Ka-band communication systems such as the FSS, LMDS, and ITS.
AEU - International Journal of Electronics and Communications.
