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This paper presents a wideband dual layer rectangular U-Slot patch antenna for WiMAX and WLAN applications. The antenna exhibits wideband characteristics that depend on various parameters such as U-slot dimensions, circular probe-fed patch etc. The characteristics of the proposed antenna are calculated and compared with other designs. The antenna shows 36.2% impedance bandwidth with more than 90%...
The following topics are dealt with: microwave antennas; passive devices and circuits; computational electromagnetics; scattering and propagation; PBG and metamaterials; low-noise devices and techniques; solid state devices and circuits; high-power devices and techniques; monolithic integrated circuits; ferrite and SAW components; microwave-optical design; photonics and optics; computer aided design,...
In this paper, the effect of long-axis length of oval-shaped chassis on the bandwidth potential of GSM antennas is analyzed for the first time. The optimal long-axis lengths for oval-shaped chassis to achieve the maximum antenna bandwidth at 900 MHz and 1800 MHz are obtained. Simulation results show that the optimal long-axis length of oval chassis at 900 MHz is about 155 mm, and at 1800 MHz the optimal...
A rectangular dielectric resonator antenna (DRA) with TExδ01 mode is proposed in this paper. Since the uniform field distribution over the main radiating aperture, it has about 6.68 dB gain at θ=0°. The designed antenna is fed at the upper side that has the potential to integrate with chip in millimeter-wave frequency band.
This paper presents a novel design of compact dual-polarized antenna incorporating an aperture-coupled annular ring patch antenna for left-handed circular polarization (LHCP) as well as a disk-loaded monopole vertical polarized (VP) antenna. Both antennas operate in the same frequency range from 2.320GHz to 2.345GHz, while CP antenna reveals good broadside radiation patterns and the VP antenna shows...
In this paper, a L-circularly polarized aperture-coupled feeding microstrip patch antenna array with a high gain and a good axial ratio is presented. It's suitable for operation in portable satellite communications stations. The microstrip line feeding of circular microstrip patch antenna is applied and the coupling aperture is the cross-shaped aperture. The proposed antenna array covers 29.4-31.0...
A novel method of designing broadband microstrip antenna is proposed in this paper. By embedding a pair of Cross-shaped slots placed close to the non-radiating edges of a microstrip patch and adding an air layer between the substrate and the ground, the broadband character can be achieved. What's more, the formulas for calculating the two resonant frequencies have been experimentally deduced. Employing...
This paper propose a novel slot antenna with pattern reconfigurability. The planar antenna is fabricated on the top side of a FR4 substrate and the microstrip feeding line is fabricated on the back side of the board. the proposed antenna demonstrates reconfigurable radiation patterns in the frequency range from 3 to 5.5 GHz. Pin diodes are used to change the radiation patterns of the proposed antenna...
A novel printed ultra-wideband (UWB) monopole antenna fed by coaxial cable is presented with a modified semicircle ground plane and a semicircle modified radiation patch. The bandwidth of the proposed antenna could increase by properly adjusting the dimensions of the ground plane and the radiation patch. The measured results show that the proposed monopole antenna offers a bandwidth from 2.95 to 11...
This paper describes a high gain cavity-backed slot(CBS) antenna. A superstrate of thin metal is placed at a certain distance above the substrate to enhance the gain of the slot antenna. The cavity-backed slot antenna is fed by a microstrip line printed on the top of the substrate. In order to reduce the size of antenna, We use the ferrite as the substrate, and the optimized antenna size is 40*30(mm)...
The multi-objective genetic algorithm (MOGA) has been applied to optimize the radiation characteristics of a tri-layer rfid microstrip patch antenna in terms of return-loss, input-impedance, bandwidth and the gain. In addition, the MOGA also optimize the size of the each layer substrate. In order to reduce the size of antenna, the Ferrite substrate has been used and the objective is to achieve high...
In this paper, a wideband antenna system with four printed monopoles is presented. The antenna system contains two symmetric pairs of antennas, and each pair comprises two back-to-back monopoles with symmetric configuration, and a transformative dual inverted-L-shaped ground branches. The measured results show that the proposed antenna system has a wide bandwidth of 1260 MHz (1660-2920 MHz), for the...
This paper presents a new microstrip open loop resonator bandpass filter (BPF) for wireless local area networks (WLAN) with wide stopband response. The proposed BPF is composed of a pair of half-wavelength open loop resonators and two additional resonators operating at the center frequency of 2.44 GHz. Two novel resonators consisted of asymmetrical spurlines and quarter-wavelength open-circuited stubs...
A compact ultra-wideband (UWB) bandpass filter (BPF) is implemented with stepped impedance resonators (SIR) and T-shaped line. Fractional bandwidth (FBW) of the UWB BPF can be adjusted properly by changing the impedance ratio of the SIR. A transmission zero is created by the central open stub of the T-shaped line to suppress the second harmonic of the filter. In addition, the filter size is further...
Based on the theoretical formulation of the electromagnetic field distributions within a square patch resonator, an equivalent circuit and corresponding coupling model of the patch resonator for dual-mode filter operations are first constructed. Then, a circular hole (called as a perturbation element) etched on the patch itself with symmetric or antisymmetric to the excitation ports is studied. Further,...
Three compact power dividers with slow wave structure and capacitor loading are presented. The divider with slow wave structure reduces the occupied area to 39% of a normal divider. And the dividers with capacitor loading reduce the occupied areas to 64.4% and 51.2% of a normal divider. The designs are validated both by simulations and measurements.
In this paper, a new novel compact dual-band bandpass filter is proposed. The module consists of two square defected structure in the ground and a dual-line coupling structure are used for coupling enhancement, the transmission zeros are then introduced to avoid being interfered by the WLAN radio signals by properly via holes. The proposed component is fabricated in a planar microstrip configuration...
A six-port circuit centered at 10 GHz based on substrate integrated waveguide (SIW) is proposed. The six-port circuit is composed of one power divider and three 90°-hybrid couplers and fed by microstrips through tapered transition line. The size of six-port circuit is only 17.5*6.1cm2. The simulation results have shown the good performance of this integrated structure.
A novel wide stopband coplanar waveguide (CPW) low pass filter (LPF) using quarter wavelength stepped impedance resonators (SIR) is presented. The bandstop characteristics of the quarter wavelength short circuited stubs SIR are demonstrated. By cascading three tapered quarter wavelength short circuited stubs SIR and a CPW spurline resonator, the fabricated low pass filter has sharp rejection with...
This paper presents a novel branch-line coupler which has a wide stopband characteristic with attenuation 30 dB from 4 GHz to 8 GHz using defected ground structure (DGS). The conventional branch-line coupler suffers from the presence of spurious response at odd harmonics of the operating frequency. The proposed coupler adopts the two symmetrical dumbbell DGS under the input and output feed lines to...
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