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This paper reports the design methodology of wideband corrugated horn antenna (1.8:1) at C-Band (Tx: 3.7-4. 2 GHz, Rx: 5.9-6.7 GHz). This paper discusses in detail various sections of horn design. i. e. input taper, mode converter, transition section, and output flare. It brings the comparison of analyzed and measured results. The measured return loss is better than 22.9 dB over C-transmit band, better...
In this paper, design and development of broadband blade monopole antenna covering 0.5-1.5 GHz is presented with simulated and measured results. Blade monopole antennas are preferred antenna configurations for airborne platforms due to lower drag offered by them. The basic antenna element configuration is optimized by simulation studies using CST Microwave Suitetrade EM simulation software.
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...
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]...
An Asymmetric Coplanar Strip (ACS) fed uniplanar antenna for wide band applications is presented. The resulting antenna offers a 2:1 VSWR bandwidth greater than 100% from 1.65 GHz to 5.06 GHz covering the DCS/PCS/IEEE 802.11a/WiMAX bands. The antenna has an overall dimension of 44 mm X 35 mm when printed on a substrate of dielectric constant 4.4 and height 1.6 mm. The wide band width is obtained by...
A circular patch antenna with a narrow slit is proposed to achieve multi frequency, dual band operation. The proposed antenna radiates at four different frequencies with sufficiently high matching with probe feed system. Among these four frequencies two frequencies 2.62 GHz and 5.82 GHz lies in lower and upper frequency band respectively of Wi-Max application created by IEEE 802.16 working group....
In this paper the analysis and design of compact CPW-fed slot antenna that operates in the IEEE 802.11a frequency band from 5.15 GHz to 5.35 GHz for wireless applications through a single grounded coplanar waveguide port for achieving sectorized radiation pattern is presented. The antenna is designed on a RT/duroid 5880 substrate with a permittivity 2.22 and with the size of 18.8 mm times 12.3 mm...
This paper presents the basic terminology and concepts of patch antenna along with the description of various feeding techniques. A 2.4 GHz in-plane inset fed microstrip patch antenna has been designed. After describing various feeding techniques, the paper gives a better understanding of the design parameters of an antenna and their effect on bandwidth and efficiency. Finally, simulation is done...
This communication presents an overview of the research work carried out related to microstrip antenna technology and Computational Electromagnetics in the Department of Electronics and Communication Engineering, Birla Institute of Technology, Mesra, Ranchi over the last few years. The communication also presents the identified areas of the research in the related field and discusses the various computational,...
In meander line antenna the size of the dipole at given frequency is reduced by a factor that is proportional to the number of turns. The adjacent horizontal segments of the meander line antenna have opposite phase. The transmission line current neither contributes much to the radiated power nor produce losses. At the location where the current reaches maximum value at that point large amount of power...
There are a number of CAD tools available in the market today for microwave designs. They enable the designer to try his hand at even very complex design very easily and quickly. They optimize MEMS designs prior to fabrication, which reduces prototype development cycle time and cuts manufacturing costs. This paper attempts to list a few of the popular CAD tools that are available in the market today...
In this paper, electromagnetic bomb is discussed with main emphasis on maximizing the lethality of the bomb by suitably designing the antenna, which can couple the high power microwaves to the targets, efficiently. Some other methods for maximizing the lethality are also discussed.
The simulated and measured results of a right triangular microstrip patch antenna (30deg - 90deg - 60deg) with and without air gap are presented in this communication. A right triangular patch antenna resonates at a single frequency but on application of small air gap of 1.5 mm between radiating patch and ground plane, it not only resonates at two frequencies but also shows marked improvement in its...
In airborne application where size and space are a constraint, reduced height waveguide are used to design the slotted waveguide array antenna. For the monopulse operation the comparator is an integral part of the antenna. Even though the comparator design is well tuned and optimized, after fabrication and integration with antenna, certain discrepancies in terms of loss and phase are inevitable. Moreover...
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...
Summary form only given. The characteristics of the uniplanar feed configuration to the rectangular dielectric resonator antenna based on the coplanar waveguide would be discussed. A comparative performance of the inductive, capacitive and the square loop feeds based on the coplanar waveguide would be addressed. It is observed that the capacitive feed to the antenna exhibits dual resonance with comparable...
The paper discusses the design of dielectric rod antenna at D band which can be used as a feed for dielectric lens antennas. This feed replaces the metallic corrugated / dual mode horns which are difficult to fabricate at these frequencies. Tapering of dielectric rod has been done to achieve low side lobe level. The designed antenna has been simulated on 3D EM software HFSS (high frequency structure...
In this paper, aperture field distributions and radiation patterns of hollow dielectric wall diagonal horn antennas are studied theoretically and experimentally at spot frequency 9.418 GHz. The theoretical near field distributions at the aperture and the four side surfaces of a horn under study for TE to x and TE to y modes are obtained by solving the Helmholtzpsilas equation using the separation...
CPW-fed planar antenna has simple structure and itpsilas uni-planar nature made it superior among various planar antennas. In this paper the effect of substrate thickness h, dielectric constant epsivr, slot length l and tapering angle thetas on the resonant frequency (fc) and bandwidth of a CPW-fed slot antenna is analyzed.
Summary form only given. This talk presents several miniaturized RF components. The components reviewed are organized in two main categories, multi-band antennas and novel structures based on carbon nanotubes. Modern personal communication systems provide many services over several bands. They require antennas that are capable of operating over the desired frequencies. System designers may use any...
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