A novel low loss microwave multiplexer design based on directional filters

Neubauer, V.; Mayer, Martin; Magerl, Gottfried

doi:10.1109/rawcon.2002.1030166

Cited by 7 publications

(4 citation statements)

References 3 publications

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“…The used source/load-pull setup is shown in Figure 7. The transistor is mounted in the test fixture located between the two triplexer filters [45]. The triplexer filters are used to separate the fundamental and harmonic signals so that they can be tuned independently.…”

Section: Active Harmonic Load Pull Measurement Setupmentioning

confidence: 99%

Highly efficient switched-mode transmitter using a current mode class-D RF amplifier

Schuberth

Singerl

Gadringer

et al. 2010

Int J RF and Microwave Comp Aid Eng

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This article presents a switched-mode transmitter architecture using a current mode class-D (CMCD) amplifier. To achieve high average efficiency for a modulated signal the envelope of the complex baseband signal is transformed into pulses such that the CMCD amplifier is operated either at its peak efficiency or completely switched off. The CMCD amplifier has been designed based on single-tone active harmonic load-pull measurements to achieve a power-added efficiency (PAE) of 61.5% with 25 W output power at 900 MHz using LDMOS FETs. Removing the losses of the demodulation filter and of the amplifier a 10% higher efficiency than in an ideal class-B amplifier can be obtained for burst-mode operation with a peak-to-average power ratio of 10 dB. V C 2010 Wiley Periodicals, Inc. Int J RF and Microwave CAE 20: 446-457, 2010.

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Section: Active Harmonic Load Pull Measurement Setupmentioning

confidence: 99%

Highly efficient switched-mode transmitter using a current mode class-D RF amplifier

Schuberth

Singerl

Gadringer

et al. 2010

Int J RF and Microwave Comp Aid Eng

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show abstract

“…The input tuner is necessary to guarantee that the device is on its gate side properly terminated into 50 Ω at the fundamental frequency. Triplexer filters [8] at the gate and drain side are used to separate the fundamental and harmonic signals so that they can be tuned independently. Because of the triplexer losses the possible tuning range is limited, especially at the harmonics [9].…”

Section: Active Harmonic Load Pull Measurement Setupmentioning

confidence: 99%

Design of a current mode class-D RF amplifier using load pull techniques

Schuberth

Singerl

Arthaber

et al. 2009

2009 IEEE MTT-S International Microwave Symposium Digest

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This work presents the design of a current mode class-D (CMCD) amplifier using a measurement based approach. Because the CMCD amplifier is in fact a push-pull version of the inverted class-F amplifier the optimum load impedances for an inverted class-F single-ended operated LDMOS FETs have been determined using an active harmonic load-pull setup. The correct time domain waveforms for an inverted class-F amplifier were verified by measurements and simulations. Based on the harmonic load-pull measurements an experimental current mode class-D amplifier with 61.5% power-added efficiency (PAE) at 25 W output is demonstrated using LDMOS FETs at 900 MHz.

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“…Also, transmission line coupling has been utilized in [10] for lower microwave frequencies. Multiplexing capabilities of the cascaded directional filter system has been shown in [11] at lower RF frequencies. The design rule limitations of LTCC process (unlike thin-film processes) drive us to utilize multilayer technology and vertical coupling to enable actual 3-D integration at millimeter-wave frequencies.…”

Section: Analysis and Application Of 3-d Ltcc Directionalmentioning

confidence: 99%

Analysis and Application of 3-D LTCC Directional Filter Design for Multiband Millimeter-Wave Integrated Module

Sarkar

Pinel

Kidera

et al. 2007

IEEE Trans. Adv. Packag.

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In this paper, we describe a systematic design and analysis procedure towards the successful implementation of 3-D low-temperature cofired ceramic (LTCC) multilayer loop directional filters at millimeter-wave frequencies. Directional filters represent a fundamental building block combining multiple filtering for mixing and multiplexing operations, hence reducing complexity while maintaining compactness. In this paper, different vertical coupling schemes are realized in order to implement the directional filters with the different performance optimums. The further use of the rectangular loop has been demonstrated as the optimum topology leading to the best performances. The filters have been measured to have less than 2.5-dB insertion loss in the bandpass path and higher than 25-dB rejection at 40 GHz, while occupying an area of 1.7 1.7 mm 2 . They demonstrate 4.7%-6.3% fractional bandwidth with better than 20-dB isolation. 40-GHz multiplexers for multiband applications with 4-GHz/8-GHz frequency separations have been designed and measured to have approximately 3-dB insertion loss in each band with better than 20-dB isolation between the outputs in passbands.This is the first complete report on LTCC directional filter-based designs towards the system-on-package (SOP) solution for the multiband millimeter-wave wireless modules.Index Terms-Directional filter, low-temperature cofired ceramic (LTCC), millimeter-wave, multiplexer, system-on-package (SOP), 3-D/vertical integration.

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A novel low loss microwave multiplexer design based on directional filters

Cited by 7 publications

References 3 publications

Highly efficient switched-mode transmitter using a current mode class-D RF amplifier

Highly efficient switched-mode transmitter using a current mode class-D RF amplifier

Design of a current mode class-D RF amplifier using load pull techniques

Analysis and Application of 3-D LTCC Directional Filter Design for Multiband Millimeter-Wave Integrated Module

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