Bandpass Filters using T-shape Stepped Impedance Resonators for Wide Harmonics Suppression and their Application for a Diplexer

Lerdwanittip, Reungyot; Namsang, Apirada; Akkaraekthalin, Prayoot

doi:10.5573/jsts.2011.11.1.065

Cited by 22 publications

(5 citation statements)

References 11 publications

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“…The stepped impedance resonator (SIR) structure has been reported in the design of bandpass filters, duplexers, and metamaterial unit-cell [ 27 , 28 , 29 , 30 ]. The SIR is a cascade of high impedance and low impedance transmission lines.…”

Section: Antenna Structurementioning

confidence: 99%

L-Shaped Slot-Loaded Stepped-Impedance Microstrip Structure UWB Antenna

Jiang

2020

Micromachines

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A stepped planar microstrip structure is proposed and demonstrated as a candidate of the ultra-wideband (UWB) antenna in the paper. In the structure, two L-shaped slots are introduced into the rectangular microstrip patch to broaden the current path at both edges of the radiating patch. The impedance bandwidth of the antenna can be extended by using the stepped impedance resonator (SIR) structure at one end of the radiation patch and connecting with the feed line. The symmetrical two I-shaped slots are loaded on the SIR microstrip to improve in-band performance and further widen the operating band. The proposed new structure can have an improvement in the in-band characteristics while extending the operating bandwidth. A broadband impedance bandwidth of 2.39 GHz to 13.78 GHz at S11 < −10 dB is demonstrated based on the proposed novel structure. The reflection coefficient and radiation characteristics are characterized in the paper. The tiny antenna, with the benefit of small area 36 mm × 23 mm, shows potential applications in ultra-wideband communication systems, wireless energy harvesting systems, and other wireless systems.

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Section: Antenna Structurementioning

confidence: 99%

L-Shaped Slot-Loaded Stepped-Impedance Microstrip Structure UWB Antenna

Jiang

2020

Micromachines

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“…Traditional microstrip filters are made using printed circuit board technology [44,45], which methods often used is etching the pattern on stacked copper sheets [38]. Alteration of the electrical length of the stub and response of the filter, however, require a number of steps and approaches, for instance, using the incorporation of varactors to bridge the disconnected part of the stub [39].…”

Section: Reconfigurable Filter and Antennamentioning

confidence: 99%

Recent progress on liquid metals and their applications

Ren

et al. 2018

Advances in Physics: X

106

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Gallium-based liquid metals show excellent thermal and electrical conductivities with low viscosity and non-toxicity. Their melting points are either lower than or close to room temperature, which endows them with additional advantages in comparison to the solid metals; for example, they are flexible, stretchable and reformable at room temperature. Recently, great improvements have been achieved in developing multifunctional devices by using Ga-based liquid metals, including actuators, flexible circuits, bio-devices and self-healing superconductors. Here, we review recent research progress on Gallium-based liquid metals, especially on the applications aspects. These applications are mainly based on the unique properties of liquid metals, including low melting point, flexible and stretchable mechanical properties, excellent electrical and thermal conductivities and biocompatibility.

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“…Where

R_{Z}

is the impedance ratio. In Equation , we can see that the resonance conditions are determined by

θ_{1}

θ_{2}

, and

R_{Z}

. We can adjust these three factors to obtain the resonance that we require, and a dual‐mode filter can be designed using an SIR.…”

Section: The Proposed Configuration For the Dbbpfmentioning

confidence: 99%

A highly efficient concurrent dual-band GaN class-AB power amplifier at 1.84 GHz and 3.5 GHz

Borjlu

Asemani

Dousti

2017

Int J RF Microw Comput Aided Eng

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This article presents the design, simulation, implementation, and experimental results of a highly efficient, concurrent dual‐band, gallium nitride (GaN), class‐AB power amplifier (PA) at two frequencies: 1.84 and 3.5 GHz. It proposes a novel dual‐band bandpass filter (DBBPF) with quad‐section stepped‐impedance resonators (SIRs) capable of rejecting the annoying frequencies of the second and third harmonics in the dual‐band. The proposed DBBPF was applied in the design of a dual‐band PA using a packaged 10 W GaN transistor. The PA prototype maintained a peak power‐added efficiency (PAE) of 75.3% at the 1.84 GHz frequency and 64.5% at the 3.5 GHz frequency. For a continuous wave output power of 40.9 dBm, the measured gain was 13 dB in the two frequency bands. Linearized modulated measurements, concurrently using 10 MHz quadrature amplitude modulation (16 QAM) signals and worldwide interoperability for microwave access (WiMAX) signals, showed an average PAE of 48.5% and 39.8% and an adjacent channel leakage ratio of −46 and −45 dBc with an average output power of 37.8 and 36.8 dBm at the two frequency bands, respectively. This PA is used for wireless systems. It is especially useful in standard simultaneous global system for mobile (GSM) and WiMAX wireless systems.

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Bandpass Filters using T-shape Stepped Impedance Resonators for Wide Harmonics Suppression and their Application for a Diplexer

Cited by 22 publications

References 11 publications

L-Shaped Slot-Loaded Stepped-Impedance Microstrip Structure UWB Antenna

L-Shaped Slot-Loaded Stepped-Impedance Microstrip Structure UWB Antenna

Recent progress on liquid metals and their applications

A highly efficient concurrent dual-band GaN class-AB power amplifier at 1.84 GHz and 3.5 GHz

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