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Nowadays, radioelectronic systems employ multiple antenna systems. An intelligent (smart) or adaptive antennas are the most suitable for wireless communication, especially for 3G and 4G systems. Many solutions of the reconfigurable antennas have been described in the literature and their practical applications have been successfully used in telecommunication systems. In general, the reconfigurable...
In this paper the analysis of a symmetrically notch loaded stacked circular disk patch antenna is carried out. It is found that the bandwidth of notch loaded disk antenna depends directly on the notch dimensions. Bandwidth of the notch loaded patch is found to be 27. 89 %. Stacking of the patch with parasitic element further improves the bandwidth to 43.56 %. Theoretical results are compared with...
In bio-medical applications and wireless communication systems, the microstrip antennas are extensively used due to their low-profile feature and ease of fabrication. With recent advances in electromagnetic computer-aided design (CAD), the design of microstrip antenna has been benefited from the utilization of accurate numerical methods. Recently the particle swarm optimization (PSO) was introduced...
In this paper, a neural network model is proposed which can be used for designing any monopole antenna whose element is square shaped and required to exhibit a wide band characteristics. All the antennas designed using this model shows a wideband response between 4.5 GHz - 5 GHz. This model is prepared using Feed Forward Back Propagation Algorithm. The results given by the prepared model are compared...
In recent years, electromagnetic simulation has seen many changes with adaptation of tools from other fields like DSP, Artificial Neural Networks, Genetic Algorithm etc. This presentation aims at informing the audience of the applications of Soft-Computing techniques for CAD in the area of Antennas and Propagation. It starts with the application of Artificial Neural Networks in design and analysis...
The paper presents realization of portable offset antenna for 20/30 GHz SATCOM applications. A dual mode feed horn (TE11 & TM11 modes) has been used as feed for offset reflector antenna. Higher order modes generated in feed horn at 30 GHz has been taken care of, as transmit frequency band is far away from receive frequency band. Antenna system has been simulated on GRASP9 software [TICRA, Denmark]...
The rocks are formed during the process of formation of earthpsilas crust. Rocks found on the earth surface are mainly three types, namely, igneous, metamorphic and sedimentary rocks. The microwave link operating over the rocky surface results in the fading of the received signal. The effect of rocky terrain on microwave link is manifested in the fading of the signal which takes place due to the destructive...
A novel single feed miniaturized cross patch antenna radiating at three resonant frequencies is presented. Compared to standard rectangular patches, the proposed antenna gives an area reduction of 82%, 74% and 53% for the linearly polarized radiations with center frequencies at 1.2395 GHz, 1.515 GHz, and 2.027 GHz respectively. The antenna exhibits nearly omnidirectional radiation characteristics...
The effects of a radome on the resonance and input impedance characteristics of a triangular microstrip antenna are experimentally investigated. To the best of our knowledge, this is the first time that the experimental results on superstrate loaded triangular microstrip patch are reported.
In this paper, an inward scaled loop antenna (ISLA) is presented. It is created by successive scaling and rotating and fitting the scaled copies of a wideband loop antenna (WBLA) in the empty space available in it. The overall size of the antenna remains the same as that of the WBLA. The advantage of an ISLA is its improved input performance as compared to the WBLA. Impedance bandwidth of the order...
The design of a triple-band planar monopole antenna is proposed. This antenna covers IEEE 802.11a, 802.11b, and 802.11g WLAN bands. Since the antenna is printed on a substrate, it can be easily integrated with the associated microstrip circuits lying on the same plane of the substrate. The antenna has been designed by using IE3D, a full wave MoM simulator from Zeland, USA. The characteristics of the...
Defected ground structures (DGS) have been developed to improve characteristics of many microwave devices. Although the DGS has advantages in the area of the microwave filter design, microstrip antenna design for different applications such as cross polarization reduction and mutual coupling reduction etc., it can also be used for the antenna size reduction. The etching of a defect in the ground plane...
The characteristics of a small antenna using an H-shaped microstrip patch antenna is analyzed. Significant reduction of antenna size can be realized when the H-shaped patch is used instead of the conventional rectangular microstrip patch antenna. The effect of various antenna parameters like substrate height, radius of shorting post and feed point are analyzed and their effect on return loss is shown.
Aperture coupled microstrip slot antenna couples the patch antenna with microstripline through an aperture. To improve the radiation pattern, there are three techniques -First using reflector plate, second using cavity and third by adjustment of the phase angle using the movement of the patch antenna on the slot i.e. by adjusting the SWR distribution. The third technique improves the radiation pattern...
Loading of microstrip antennas provides dual frequency, tenability and compactness. In this paper a theoretical method is developed to calculate various parameters of loaded annular ring antenna via. Shorting pins. The pins are located symmetrically i.e. equispaced along the circumference of the annular ring. Various parameters such as input impedance, bandwidth, return loss, quality factor and radiation...
A varactor tuned microstrip patch antenna has been designed and developed, with a view to predicting the obtainable tunable range. Tunability is achieved by connecting varactor diodes thus altering the capacitance of the patch and hence resonant frequency. Although this antenna has a narrow instantaneous bandwidth, electronic tuning allow a large band to covered whilst maintaining the same good narrow...
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