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Design of an all-dielectric band-stop frequency selective surface (FSS) is proposed for X-band application. The unit particle of the FSS consists of a thick upper hexagonal prism part and a thin lower hexagonal prism part for monolithic construction. The proposed FSS has planar array of hexagonal ceramic prisms having a honey comb-shaped structure. The proposed FSS has three resonant dips. Those are...
The arms of a sinuous antenna are modified and the effects are investigated in terms of the polarization and group delay. Conventional sinuous antennas (CSA's) operate over a broad bandwidth. However, they show unwanted spikes when their polarization and group delay are plotted as functions of frequency. These spikes are thought to originate from the sharp ends and the bends of the arms. This paper...
In this paper, we aim to design a waveguide feeder for a parallel plate slot array antenna for a high resolution Synthetic Aperture Radar system on-board a 100 kg micro-satellite called Micro-XSAR, scheduled to be launched by Japan Aerospace Exploration Agency by 2020. In order to increase the antenna beam-width and thereby mitigate the frequency-dependent beam-shift, we employ center feeding using...
The three dimension cylindrical structure is interesting, challenging and offers excellent space utilization. With utilization of three-dimensional space, the unit cell size of the FSS can be further reduced. A novel design of three dimensional Cylindrical Shaped Frequency Selective Surface (CSFSS) based on a single circular ring structure has been proposed. Firstly, a circular ring has been chosen...
Here represented SIW cavity backed inverted T-shaped slot antenna which is implemented with help of Rogers RT/Duriod 5880 substrate with dielectric constant of 2.2, height of substrate is 0.02 inches and it is implemented for 60GHz applications. Observed the results like reflection coefficient, VSWR, gain and radiation patterns. This structure will provide 3.713 GHz bandwidth with respect to reflection...
An in-plane vibration sensor with off-resonant band-pass displacement amplification and a differential capacitive readout is presented. The minimum mechanical amplification of 16 dB (i.e. a factor of 6.6) within the designed frequency band from 3–13 kHz is independent of pressure in the range of 6.3 to 64 mbar with a less than 10% change. For a flattened transfer-function a pressure close to 30 mbar...
We report on the principle and broadband operation of ring-shaped piezoelectric micromachined ultrasonic transducers (pMUTs) in liquid-coupled operation. Specifically, fabricated devices are measured to have a velocity bandwidth of up to 160%, which is more than 60% greater than the highest bandwidth of any reported pMUT and is tunable by altering device dimensions. This broadband performance is due...
Wide bandwidth for an air-coupled piezoelectric micromachined transducer (PMUT) is important to achieve short pulse transmission and reception in pulse-echo imaging with high axial resolution. Here, we report experimental results on an air-coupled PMUT with high displacement sensitivity up to 5500 nm/V, high 3 dB bandwidth of 20.3 kHz, and correspondingly short transmission time of 0.05 ms, achieved...
The microstrip antennas with symmetrical comb-shaped radiator are considered. The influence of depth of the cuts on main electrical characteristics of four- and eight-comb antennas is researched. The resonance frequency, the bandwidth and reflection coefficient are chosen as characteristics. The graphs of unknown dependencies are constructed for the two basic frequencies.
A dual-band ultra-wide band (UWB) antenna forradar applications is presented in this paper operated at Ku bandand K band frequencies. The proposed antenna is performedwith Rogers RT5880 dielectric substrate material with thicknessof 1.2mm and designed different rectangular slots. It is fed bycoaxial feeding techniques to achieve the wider characteristics. The most of element area the current is distributed...
A slotted fan shaped microstrip patch antenna with three operating frequencies for radar application is presented. The design model is made to resonate at three frequencies in X-band. The X-band frequency range falls between 8 to 12 Gigahertz and are extensively used in radar applications. The dielectric substrate material used by the antenna is of low cost FR4 (Flame Retardant — Grade 4) Epoxy. To...
In this project, an efficient design of circular shaped microstrip patch antenna for Ultra Wide Band (UWB) applications is proposed with partial ground structure. In the recent era, microstrip patch antenna plays a vital role as they are found to be immensely useful due to its compact nature, easy integration and its light weight. UWB systems are popular because of their larger bandwidth and power...
The battery strength indicator provided in the taskbar of a PC/ Laptop (usually at the bottom of the desktop) indicates the current battery strength available to the user. The position of this battery strength indicator on the main screen varies from device to device and this indicator describes the required level of charging and duration it would take for the device to reach a completely charged...
This work proposes a stabilization and noise suppression method for the angle velocity sensor integrated readout circuit using additional adaptive feedback. This feedback circuit senses corner frequency of the input signal and adjusts readout bandwidth and output noise in accordance with this corner frequency. Model of sensor and readout circuit was developed in order to estimate dynamic and noise...
In this paper, multiband Bow Tie antenna with the circular arm is proposed with two circular slots of radius 13 mm in the ground plane. By applying the Apollonian Gasket of fractal geometry on the circular arm of Bow Tie this antenna is resonating at four frequencies, 3.57, 5.79, 6.99 and 8.38 GHz with reflection coefficient values of −19.42 dB, −52.97 dB, −29.93 dB and −26.92 dB respectively. With...
The printed monopole antenna having dual band is proposed which operates at frequency 2.54 GHz (Bluetooth) and 5.2GHz (WLAN). Bluetooth and WLAN have been widely applied in all new trending laptops and smart phones. These two technologies are well known for its effective cost and high-speed data connection. The antenna comprises of two rectangular patches of different sizes for the required dual-band...
Dielectric Resonator Antenna (DRA) plays a vital role in the wireless communication systems due to its support for wide impedance bandwidth and symmetrical radiation pattern. Dielectric Resonator Structures (DRS) combined with metallic structures reduce the antenna size at low frequency bands of operation. In this paper, a monopole antenna is designed to operate at 5.5 GHz and the antenna performance...
This paper describes the effect of wire with small circular ground plane size (radius < λ/20) for normal mode helical antenna at which resonance condition is achieved without using any external impedance matching network. A comparative study of variation in performance of helical antenna with respect to variation in thickness of wire and ground plane size at 1.8 GHz is carried out using simulation...
A new and very simple way of implementing defected ground structure (DGS) in a microstrip patch antenna is presented. The dimension of DGS is exactly same as the dimension of radiating element. There are two different DGSs implemented in this paper. The DGSs are complement of each other with respect to their structures. The antennas with these complementary DGSs show four different frequencies of...
In this paper circularly Polarized Dielectric Resonator Antenna for the Satellite frequency applications has been designed. With proper design the proposed Cylindrical DRA fed by centered V-shaped slot; is showing characteristics of Circular Polarization in the desired band. Two orthogonal arms of symmetrically centered V-shaped slot having same dimension excite the TM01δ modes at 9.75GHz as well...
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