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For C band receptor applications, an efficient and compact sized four port directional coupler has been designed using Substrate Integrated Waveguide technique. Dielectric filled waveguide (DFW) devices replace the microstrip devices as they are inefficient at high frequencies. With the help of via holes, DFW is converted to Substrate Integrated Waveguide (SIW) to considerably reduce the dielectric...
This paper present a tri band frequency selective surface (FSS) using square loop, ring loop and cross dipole structure on a single layer. The proposed FSS is used to reject the frequency bands of Wi-Fi and Amateur radio bands of 2.5GHz, 5GHz and 10.5GHz. The proposed FSS designed on a FR4 substrate having relative permittivity of 4.4 with a loss tangent of 0.025 having a thickness of 0.4mm. This...
Equal and unequal miniaturized power divider with Substrate Integrated waveguide and circular Complementary Split Ring Resonator has been proposed for C band applications. SIW structure reduces loss and improves the performance, whereas CSRR varies the resonant frequency and exhibits bandpass response. The power division ratio can be varied by changing the CSRR structure configuration. The power divider...
A dual and triple band bandpass filter is designed operating at X and Ku-band. Based on pure geometric analysis of width to length ratio's relationship with modes generated in substrate integrated waveguide cavity, a square substrate integrated waveguide cavity is designed to operate at TE101, TE201, TE102 modes. Coupling matrix for passband is derived based on coupling topology from the resonating...
ZnO and cadmium alloyed zinc oxide (Zn0.9Cd0.1O) thin films were deposited on glass substrate by sol-gel spin coating technique for UV–Vis photodetection application. The properties of the thin films were investigated using X-ray diffractometer, atomic force microscope, scanning electron microscope, energy dispersive spectrometer and UV–Vis spectrometer. The optical band gap of ZnO thin films was...
This paper presents the design and parametric analysis of various MNG structures such as SRR, CLL, SR and Omega particle. Depending on the structure and its dimensions, negativity and S-Parameter characteristics of each MNG structure changes. These structures exhibits stop band characteristics depending on negative permeability and hence find applications in microwave circuit. The structures are realized...
This paper presents the design and parametric analysis of various ENG structures such as CSRR, C-CLL, C-SR, C-Omega and ELC. Depending on the structure and its dimensions, negativity and S-Parameter characteristics of each ENG structure changes. These structures exhibits either pass band or stop band characteristics depending on negative permittivity and hence find applications in microwave circuits...
In this paper, an approach is taken to reduce the size and suppress harmonics of rat race coupler with the help of Circular defected ground structure. The reduction in size is possible due to the lowering of resonant frequency which in turn is a result of slow wave effect. The proposed structure is additionally able to make the response as a wide band. The two parameters of CDGS are modeled rigorously...
In this paper, a method to design a feeding circuit for Wi-Fi devices which operate at 2.4 GHz standard has been proposed. The feeding circuit is a branch line coupler which couples a power 10 dB below the 0 dB level of the input power. In order to combat problems due to extremely high impedance, a rectangular ring headed dumbbell shaped Defected Ground Structure (DGS) is employed below the parallel...
In this paper, a miniaturized rat race coupler with stub loaded transmission lines is proposed to operate at WLAN 1 frequency i.e., 2.4 GHz. A comparative analysis has been made by replacing the conventional quarter wavelength transmission lines by stub loaded transmission lines. The proposed model has been designed on RT Duroid /5880 substrate and simulated using AWR Design Environment. Subsequent...
This paper presents a low profile sierpinski fractal antenna for ultra wide band applications. The proposed antenna is designed by incorporating sierpinski fractals inside a circular ring of width 1mm which improves the impedance band width and radiation efficiency of the antenna. The proffered antenna of dimensions 29×28×1.6 mm3 covering the frequency range of 3.7 to 14.3 GHz with radiation efficiency...
Design and performance measures of a printed multi strip monopole antenna for ultra-wideband application are presented. The proposed antenna consist of six quarter wavelength strips of different resonating frequency combined in a manner to provide wideband width. It operates in the frequency range 2.51∼10.61GHz with impedance bandwidth of 8.1 GHz. The radiation pattern is nearly Omni directional in...
A planar multi-ring monopole antenna for ultra wide band applications is presented in this paper. The proposed antenna is designed using concentric rings of width 1.3 mm which leads to improved band width, radiation efficiency and reduced size. The proposed antenna size is 30∗30∗1.6 mm3 which operates over a frequency range of 2.6 to 13.5 GHz. The radiation pattern is consistent in UWB range which...
This paper presents a low-profile, single layered rectangular microstrip patch antenna designed to operate for 2.45GHz and 4.96GHz frequency band of IEEE 802.11.A rectangular patch of dimensions 18.6×26.8mm is positioned above the surface of an Alumina (Al2O3 ceramic) substrate at a height of 4mm from the ground plane and fed by coaxial feed configuration to operate at 2.45GHz frequency band (IEEE802...
This paper presents the design and analysis of spiral antenna for wearable application. The operating frequency of the spiral antenna directly depends on the length of the spiral. The proposed antenna has operating frequency range from 0.65 GHz to 1.49 GHz. The antenna exhibits Omni-directional radiation pattern in both E-plane and H-plane with the gain ranging from 3.02 dB to 6.82 dB. Simulation...
A multi-fractal monopole antenna for Ultra wide band applications is presented in this paper. The proposed antenna consists of a combination of Koch and Sierpinski fractals within a ring. Use of multi-fractal technique leads to improved bandwidth, radiation efficiency and reduced size. The proposed antenna size is 19.5∗19.5∗1 mm3 which operates over a frequency range of 4.2 to 10.3 GHz. Radiation...
A Band pass filter which operates in the ultra wide band (UWB) range is designed and implemented. The proposed filter consists of two Interdigital coupled lines at the terminal end and three circular shaped electromagnetic band gap structures (EBG) at the centre of filter configuration. The Circular shaped EBG structures act as a multimode resonator (MMR) which is used to tune the frequency ranges...
An Ultra wide Band pass filter which operates from 3.45–10.35 GHz is designed and presented. The proposed filter consists of short circuited shunt stubs and circular shaped defected ground structures (CDGS).The CDGS acts as a low pass filter which rejects higher order frequencies whereas the short circuited shunt stubs act as a high pass filter. CDGS also suppresses the harmonic and improves the frequency...
Defected ground structure have been always an area of interest for research in millimetre waves and microwaves. In this paper, the different parameters of a defected ground structure which helps in lowering cut-off frequency and resonant frequency of microstripline have been analysed. A circularly shaped defected ground structure which is equivalent to LC model circuit has been simulated and its performance...
This paper presents the design of reconfigurable antenna for LTE (band1, band23, band40) and WLAN applications. The proposed antenna consists of rectangular patch fed by a proximity feed. The presence of square slots on the diagonal corners is used for frequency reconfiguration. The antenna can operate at 2.07GHz, 2.1GHz 2.4GHz and 2.45GHz by proper selection of diagonal slots. The directivity is...
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