A wide differential passband filter with common-mode suppression property based on left handed metamaterial transmission line

We present a new concept of the thermoelectric structure that generates microwave and terahertz signals when illuminated by femtosecond optical pulses. The structure consists of a series array of capacitively coupled thermocouples. The array acts as a hybrid type microwave transmission line with anomalous dispersion and phase velocity higher than the velocity of light. This allows for adding up the responces from all the thermocouples in phase. The array is easily integrable with microstrip transmission lines. Dispersion curves obtained from both the lumped network scheme and numerical simulations are presented. The connection of the thermocouples is a composite right/left-handed transmission line, which can receive terahertz radiation from the transmission line ports. The radiation of the photon to the surface of the thermocouple structure causes a voltage difference with the bandwidth of terahertz. We examined a lossy composite right/left-handed transmission line to extract the circuit elements. The calculated properties of the design are extracted by employing commercial software package CST STUDIO SUITE.

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Design and Analysis of a Bandpass Filter Using Dual Composite Right/Left Handed (D-CRLH) Transmission Line Showing Bandwidth Enhancement

Wireless Personal Communications ◽

10.1007/s11277-021-08529-6 ◽

2021 ◽

Author(s):

Priyanka Garg ◽

Priyanka Jain

Keyword(s):

Transmission Line ◽

Bandpass Filter ◽

Bandwidth Enhancement ◽

Left Handed

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Tunable balanced to balanced filtering power divider with high common-mode suppression

Frequenz ◽

10.1515/freq-2019-0178 ◽

2020 ◽

Vol 74 (7-8) ◽

pp. 263-270

Author(s):

Cao Zeng ◽

Xue Han Hu ◽

Feng Wei ◽

Xiao Wei Shi

Keyword(s):

Return Loss ◽

High Selectivity ◽

Power Divider ◽

Center Frequency ◽

Differential Mode ◽

Common Mode ◽

Mode Suppression ◽

The Common ◽

Equal Power ◽

Good Agreement

AbstractIn this paper, a tunable balanced-to-balanced in-phase filtering power divider (FPD) is designed, which can realize a two-way equal power division with high selectivity and isolation. A differential-mode (DM) passband with a steep filtering performance is realized by applying microstrip stub-loaded resonators (SLRs). Meanwhile, six varactors are loaded to the SLRs to achieve the center frequency (CF) and bandwidth adjustment, respectively. U-type microstrip lines integrated with stepped impedance slotline resonators are utilized as the differential feedlines, which suppress the common-mode (CM) intrinsically, making the DM responses independent of the CM ones. A tuning center frequency from 3.2 to 3.75 GHz and a fractional bandwidth (12.1–17.6%) with more than 10 dB return loss and less than 2.3 dB insertion loss can be achieved by changing the voltage across the varactors. A good agreement between the simulated and measured results is observed. To the best of authors' knowledge, the proposed balanced-to-balanced tunable FPD is first ever reported.

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