Triple Notch Research Articles

Developing single‐layer ultra‐wideband band‐pass filter with multiple (triple and quadruple) notches

New ultra-wideband (UWB) band-pass filters (BPFs) with multiple (triple and quadruple) notches are proposed. A systematic approach is demonstrated to establish one to four or more notch-bands within the passband of a UWB BPF on a single-layer substrate using μ-strip technology, while avoiding the use of any via-holes. The proposed filters are based on parallel integration of gap-coupled microstrip resonators (GCMR) and two tri-section stepped-impedance resonators (TSSIR) to generate multiple notches. Two notches are produced by the use of TSSIR fundamental and first spurious resonance frequencies and the third and fourth notches are introduced by developing transmission zeros using additional integrated GCMR. Two samples of triple and quadruple notch-band UWB filters are fabricated and tested. In comparison to the previous triple single-layer notch-band BPFs with via-holes, the proposed single-layer triple notch BPF offers a size reduction of around 52%. The authors have also expanded the concept and designed a new quadruple notch-band UWB BPF. The proposed filter uses only a single layer and can be easily mass-produced with low cost.

UWB printed plaque monopole antennas for tri-band rejection

In this article, a printed plaque monopole antenna fed by a microstrip line for ultrawideband (UWB) width with triple notch band has been presented.The antenna is then modified to possess band rejection at the wireless local area network (5.1–5.8 GHz) by an inverted U-shape slot or Π-shape slot, or Λ–shape slot within the radiating patch. In addition, two half wavelength slots (U-slot) are cut in the radiating patch to generate the first and third notch band in 3.25–3.75 GHz for WiMAX and 7.25–7.75 GHz for down link of X-band satellite communication system. Surface current distributions and transmission line model are used to analyze the effect of these slots. The proposed antennas are simulated and fabricated. Radiation pattern shows good omnidirectional radiation patterns in the H-plane and monopole like patterns in the E-plane. The proposed antenna gain varies from 1.63 to 5.05 dB over the whole UWB region excluding at notch band. The design antenna has a compact size of 30 × 30 mm2. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:674–680, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27359

A Novel Compact UWB Monopole Antenna with Bluetooth and Triple Notch Band

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A Novel Compact UWB Monopole Antenna with Bluetooth and Triple Notch Band

AbstractA novel technique to add an extra Bluetooth band and triple notch bands simultaneously to a compact ultra-wideband (UWB) monopole antenna is presented. This scissors-shaped UWB antenna, covering 2.9 GHz–12.5 GHz, is fed by a special microstrip line. To create an extra Bluetooth band centered at 2.45 GHz, an arc-shaped stub is attached to the high concentrated current area right of the feed line and a rectangular slot is etched in the radiation patch. Besides, a notch band for WLAN (5.6 GHz–6.15 GHz) is also obtained. In addition, by connecting two asymmetric stubs to the feed line, two other notch bands in 3.28 GHz–3.8 GHz for WiMAX and 7.1 GHz–7.76 GHz for downlink of X-band satellite communication systems are achieved. The proposed antenna with compact size of 20 mm × 26 mm is fabricated and measured, showing stable antenna gain and good omni-directional radiation patterns in H-plane.

UWB-BPF WITH APPLICATION BASED TRIPLE NOTCHES AND SUPPRESSED STOPBAND

An ultra-wideband (UWB) bandpass fllter (BPF) with application oriented triple notches and simultaneously suppressed stopband is proposed. Implementing complementary split ring resonator (CSRR) and novel complementary meandered folded split ring resonators (CMFSRR) shaped defected ground structures (DGS) in the ground of proposed structure generates the triple notch in the UWB passband. The notch positions are functions of CSRR/CMFSRR proflle dimensions. Stopband is suppressed using the dual attenuation poles generated by the double equilateral-U (DEU) shaped DGS. An approximate lumped equivalent circuit model of the proposed fllter is presented. Measured results obtained are in good agreement with the equivalent circuit model and full wave electromagnetic (EM) simulation. The fllter is small in size with an overall area of 26:06mm£ 11mm.

Notch stress concentrations and failure characteristics in laminates with triple parallel notches

This paper deals with stress concentrations in laminates with triple parallel-arranged and equally spaced notches. By the use of the finite-element method, the stress concentration factors at points on the boundary of a notch were calculated for unidirectional and cross-ply laminates and for isotropic plates with surface or through notches. It was found that the stress concentration factors near the notch change from high to low then revert to high with spacing between both neighboring notches for all the calculated cases. A series of failure tests on carbon-fiber/epoxy laminate specimens with triple notches were conducted. The test results validated the calculated results.