Large-signal measurements of Dual-Band/Diplexer distributed amplifiers with non-uniform gain distribution

This paper shows that the two most common impedance transformation networks for power amplifiers (PAs) can be designed to achieve optimum transformation at two frequencies. Hence, a larger bandwidth for the required impedance transformation ratio is achieved. A design procedure is proposed, which takes imperfections like losses into account. Furthermore, an analysis method is presented to estimate the maximum uncompressed output power of a PA with respect to frequency. Based on these results, a fully integrated PA with a dual-band impedance transformation network is designed and its functionality is proven by large signal measurement results. The amplifier covers the frequency band from 450 MHz to 1.2 GHz (3 dB bandwidth of the output power and efficiency), corresponding to a relative bandwidth of more than 100%. It delivers 23.7 dBm output power in the 1 dB compression point, having a power-added efficiency of 33%.

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Dual-Band Dual-CP All-Metal Antenna With Large Signal Coverage and High Isolation Over Two Bands for Vehicular Communications

IEEE Transactions on Vehicular Technology ◽

10.1109/tvt.2019.2952880 ◽

2020 ◽

Vol 69 (1) ◽

pp. 1131-1135 ◽

Cited By ~ 1

Author(s):

Shiyan Wang ◽

Lei Zhu ◽

Gang Zhang ◽

Jiquan Yang ◽

Jianpeng Wang ◽

...

Keyword(s):

Dual Band ◽

Vehicular Communications ◽

Large Signal ◽

High Isolation ◽

Signal Coverage ◽

Metal Antenna

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Large-signal capabilities and analysis of distributed amplifiers

Electronics Letters ◽

10.1049/el:19840215 ◽

1984 ◽

Vol 20 (8) ◽

pp. 317 ◽

Cited By ~ 5

Author(s):

P. Gamand ◽

Y. Crosnier ◽

P. Gelin

Keyword(s):

Large Signal ◽

Distributed Amplifiers

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High gain dual-band distributed amplifier using new composite right/left-handed transmission line

International Journal of Microwave and Wireless Technologies ◽

10.1017/s1759078718001265 ◽

2018 ◽

Vol 10 (10) ◽

pp. 1118-1127

Author(s):

Hamed Shahraki ◽

Ahmad Hakimi ◽

Kambiz Afrooz ◽

Mohammad Mahdi Pezhman

Keyword(s):

Transmission Line ◽

Wave Attenuation ◽

High Gain ◽

Dual Band ◽

Power Gain ◽

Frequency Bands ◽

Distributed Amplifiers ◽

Distributed Amplifier ◽

Left Handed ◽

Simulation Results

AbstractIn this paper, a high-gain dual-band distributed amplifier (DBDA) based on the metamaterial transmission line (TL) is proposed. To have two separate frequency bands in the distributed amplifiers, the composite right/left-handed (CRLH) TLs are used instead of conventional TLs. Although both forward and reverse gains of the distributed amplifiers are available in this case, they suffer from their low gains. In this paper, to increase the DBDA power gain, a new circuit architecture for the CRLH TL is introduced. By using the proposed CRLH TL, a lower wave attenuation coefficient at the forward band of the DBDA is achieved than the conventional structures, which causes a higher forward power gain. Simulation results also show that the power gain of the proposed DBDA is about 28.5 dB at the desired frequency bands, and good agreement between the measurement and simulation results confirms the accuracy of the design method.

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DNA sequence mapping in interphase and metaphase chromosomes by fluorescence in situ hybridization

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100122885 ◽

1992 ◽

Vol 50 (1) ◽

pp. 496-497

Author(s):

Barbara Trask ◽

Susan Allen ◽

Anne Bergmann ◽

Mari Christensen ◽

Anne Fertitta ◽

...

Keyword(s):

In Situ Hybridization ◽

Dna Sequence ◽

Dna Sequences ◽

Dual Band ◽

Nick Translation ◽

Metaphase Chromosomes ◽

Band Pass ◽

Texas Red ◽

Fluorescent Spot

Using fluorescence in situ hybridization (FISH), the positions of DNA sequences can be discretely marked with a fluorescent spot. The efficiency of marking DNA sequences of the size cloned in cosmids is 90-95%, and the fluorescent spots produced after FISH are ≈0.3 μm in diameter. Sites of two sequences can be distinguished using two-color FISH. Different reporter molecules, such as biotin or digoxigenin, are incorporated into DNA sequence probes by nick translation. These reporter molecules are labeled after hybridization with different fluorochromes, e.g., FITC and Texas Red. The development of dual band pass filters (Chromatechnology) allows these fluorochromes to be photographed simultaneously without registration shift.

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Dual band hybrid vehicular telephone antenna

IEE Proceedings - Microwaves Antennas and Propagation ◽

10.1049/ip-map:20020293 ◽

2002 ◽

Vol 149 (1) ◽

pp. 41-44 ◽

Cited By ~ 4

Author(s):

L. Economou ◽

R.J. Langley

Keyword(s):

Dual Band

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Single-peak-regulation and wide-angle dual-band metamaterial absorber based on hollow-cross and solid-cross resonators

The European Physical Journal Applied Physics ◽

10.1051/epjap/2020200145 ◽

2020 ◽

Vol 91 (3) ◽

pp. 30901

Author(s):

Yibo Tang ◽

Longhui He ◽

Jianming Xu ◽

Hailang He ◽

Yuhan Li ◽

...

Keyword(s):

Transverse Electric ◽

Surface Current ◽

Dielectric Substrate ◽

Transverse Magnetic ◽

Metamaterial Absorber ◽

Absorption Peak ◽

Dual Band ◽

Single Peak ◽

Wide Angle ◽

Surface Current Density

A dual-band microwave metamaterial absorber with single-peak regulation and wide-angle absorption has been proposed and illustrated. The designed metamaterial absorber is consisted of hollow-cross resonators, solid-cross resonators, dielectric substrate and metallic background plane. Strong absorption peak coefficients of 99.92% and 99.55% are achieved at 8.42 and 11.31 GHz, respectively, which is basically consistent with the experimental results. Surface current density and changing material properties are employed to illustrate the absorptive mechanism. More importantly, the proposed dual-band metamaterial absorber has the adjustable property of single absorption peak and could operate well at wide incidence angles for both transverse electric (TE) and transverse magnetic (TM) waves. Research results could provide and enrich instructive guidances for realizing a single-peak-regulation and wide-angle dual-band metamaterial absorber.

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