A Compact Sideband Separating Downconverter With Excellent Return Loss and Good Conversion Gain for the W Band

Monasterio, David; Jarufe, Claudio; Gallardo, Diego E.; Reyes, Nicolás; Mena, F. P.; Bronfman, L.

doi:10.1109/tthz.2019.2937955

Cited by 11 publications

(6 citation statements)

References 13 publications

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“…Chile has a well-established tradition on scientific activities related to astronomy. The most outstanding research on RF and microwaves in Chile is mainly focused on microwave integrated circuits for radio astronomy [44], [45], remote sensing [46], radio imaging [47], nanosatellite systems [48], and antennas [49]- [52].…”

Section: Rf and Microwave Research In Chilementioning

confidence: 99%

An Overview of RF and Microwave Research in Latin America: Scanning Latin American Research on Microwaves

Rayas‐Sánchez

Reynoso-Hernández

2023

IEEE Microwave

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Section: Rf and Microwave Research In Chilementioning

confidence: 99%

An Overview of RF and Microwave Research in Latin America: Scanning Latin American Research on Microwaves

Rayas‐Sánchez

Reynoso-Hernández

2023

IEEE Microwave

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“…The resistive mixer in Fig. 6(a) allows high linearity and a wide bandwidth [14]- [18]. The large LO signal is applied to the gate of the transistor, varying the channel conductance of the transistor to generate IF current as a result of mixing with the RF signal applied from the drain.…”

Section: A Resistive Mixermentioning

confidence: 99%

“…These values are lower than the results reported for lower frequency IRMs, because of the increased phase and amplitude mismatches between the Q and I channels at high frequencies. Sideband separating mixers have been reported at millimeter-wave and terahertz frequencies for radio astronomy in multi-chip waveguide modules which can entail severe amplitude and phase mismatches between I and Q channels [14], [15]. Several methods to reduce the mismatches and thus improve the IRR have been investigated.…”

Section: Introductionmentioning

confidence: 99%

“…However, this experimental method cannot provide the theoretical origin of high IRR or a design guide, and thus cannot be used in practical applications where the IF range is prespecified. In [14], the operating points of the amplifiers in the multi-chip W -band sideband separating mixer were experimentally optimized to reduce the amplitude mismatches and achieve high IRR. In summary, the previous techniques to enhance the IRR are mostly focused on reducing the mismatches of circuit components or the experimental optimization.…”

Section: Introductionmentioning

confidence: 99%

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$W$ -Band Mixer With High Image Rejection by Mismatch Compensation Using Buffer Amplifier

Choe

Kim

Kim³

et al. 2020

IEEE Access

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In this paper, a W-band mixer integrated circuit (IC) with high image rejection ratio (IRR) is presented, compensating for the amplitude and phase mismatches between the I and Q channels in the image rejection mixer (IRM) using RF buffer amplifiers. It is shown by analysis and simulation that the signal coupling between the I and Q channels in the IRM can generate mismatches which can severely degrade the IRR, even though other circuit components are symmetrically designed so as not to induce mismatches. The coupling between two channels can become serious, especially in millimeter-wave IRM ICs where the circuit components are laid out in close proximity to reduce the chip size. It is also shown that poor isolation of millimeter-wave couplers can seriously degrade IRR. In this work, we employ an RF buffer amplifier at the RF port of the resistive mixer to compensate for the amplitude and phase mismatches. The designed W-band IRM IC is fabricated in a 0.1-µm GaAs pHEMT process. Measurements show that the bias tuning of the RF buffer amplifiers can minimize the mismatches and improve the IRR by up to 35 dB at RF from 91 to 95 GHz at an IF of 50 MHz. The IRM exhibits an IRR of 19.2-47.9 dB with conversion loss of 7.9-9.2 dB, which belongs to the highest IRR among the reported IRMs in the W-band. INDEX TERMS IC, image rejection, millimeter-wave, mixer.

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“…First, to connect the circuits with waveguides that allow their characterization in waveguide-based setups. Second, for their integration with waveguide components such as high-gain antennas [8], diplexers [9], filters [10], and orthomode transducers [11]. In our particular case, the transition is needed for the transmission of the LO signal within a sub-harmonic mixer that is currently being developed for an extended W band.…”

Section: Introductionmentioning

confidence: 99%

A broadband waveguide-to-50 Ω-microstriptransition with low-loss

Cubillos

Saldaña

Monasterio

et al. 2023

Preprint

Self Cite

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The increment in the demand for high-frequency monolithic integrated circuits has driven the development of waveguide-to-microstrip transition that allow their characterization and integration with waveguide components. Unfortunately, some of these transitions currently feature a rather narrow bandwidth, especially when the substrate is inserted transversal to the propagation direction of the waveguide. Here we present a new design that overcomes this problem. The transisition was originally designed for a bandwidth of 33.5–60 GHz (extended V-Band) with the simulation results showing reflections below −19.5 dB in a fractional bandwidth of 55% and, moreover, can be scaled to other frequencies keeping good electrical characteristics. To validate the design we show the scaling, construction, and measurement in an extended Q-band (27–50 GHz) with the additional advantage of having a standard impedance of 50 Ω. The most novel feature is a staggered air cavity for the microstrip and planar probe, which generates return losses better than 20 dB in a fractional bandwidth of 53%.

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A Compact Sideband Separating Downconverter With Excellent Return Loss and Good Conversion Gain for the W Band

Cited by 11 publications

References 13 publications

An Overview of RF and Microwave Research in Latin America: Scanning Latin American Research on Microwaves

An Overview of RF and Microwave Research in Latin America: Scanning Latin American Research on Microwaves

$W$ -Band Mixer With High Image Rejection by Mismatch Compensation Using Buffer Amplifier

A broadband waveguide-to-50 Ω-microstriptransition with low-loss

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