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In this paper, design and development of rectangular sleeve dipole antenna covering more than an octave bandwidth (850-2500 MHz) is presented with measured results. Here a rectangular box type of sleeve is proposed over the cylindrical dipole elements. This antenna is compact in size and covers more than 2.9:1 bandwidth with maximum VSWR 3:1. The antenna was first simulated using CSTtrade microwave...
A dual band RFID applications in 800 - 900 MHz and 2400 MHz band is presented. The Asymmetric Coplanar Strip (ACS) fed antenna consists of inverted L shaped monopole with a capacitive loading to provide necessary impedance matching and current distribution. The antenna has wide bandwidth from 790 MHz to 1050 MHz and from 2350 MHz to 2640 MHz coving the RFID UHF and Microwave frequencies. The uniplanar...
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...
Dielectric Resonator has wide application in satellite communication because of its small size, large bandwidth and high Q-factor at microwave and millimeter wave frequencies. Dielectric Resonator also finds its application as an antenna element due to high radiation efficiency, small size and low losses. The resonant frequency is determined by the overall physical dimension of the puck and the dielectric...
A conventional circular patch microstrip antenna (CPMA) is proposed on LiTi ferrite substrate in X-band (8-12 GHz) region. In this paper, we precise the preparation of a polycrystalline LiTi ferrite of 2200 Gauss 4 piMs and characterize their electric and magnetic properties as a substrate for CPMA. The comparison of radiation patterns and other parameters between normal dielectric substrate (Quartz)...
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.
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...
The multi-band microstrip antennas are realized by placing open circuit quarter wavelength stub on the edges of the patch or by cutting nearly half wavelength or quarter wavelength resonant slot inside or on the edges of the patch. The stub offers either capacitive or inductive impedance around the resonance frequency of the patch and realizes the dual frequencies. The slot adds another resonant mode...
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...
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...
We have designed the unusual types of feed antenna for parabolic dish that is used for both reception and transmission purpose. This different frequency band performance having horn and helical feed, works for the parabolic reflector antenna. We have worked on frequency band between 4.8 GHz to 5.9 GHz for horn type of feed. Here function of the horn is to produce uniform phase front with a larger...
The fractal geometries such as Koch curve, Sierpinsky gasket, and Hilbert curve, etc. have been widely studied and applied to design several microwave devices, such as antennas, frequency selective surfaces (FSS), and photonic band gap (PBG) devices. There are several advantages of these fractal devices including reduction of resonant frequencies, smaller size and broadband width. In this paper a...
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.
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....
This communication presents a comparison in the performance of a normal elliptical microstrip patch antenna with same antenna having loading of sector slits. Required number and dimensions of the slits for bandwidth enhancement are optimized for reliable radiating characteristics. It is found that resonant frequency of the unslotted elliptically patch antenna is about 5.62 GHz, with an operating bandwidth...
Antennas have been increasingly studied in recent years. Different antennas have been designed for different applications based on the characteristics of the receiving side. Antennas cannot be fabricated as such and then be studied on. This leads to waste of material and requires a lot of iterations until we get the final design. In order to study the characteristics of an antenna without fabricating...
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 we propose the antenna geometry to design a very compact microstrip patch antenna using thin dielectric substrate having low dielectric constant. This antenna provide better efficiency, better band-width without any enhancement in the weight, volume or cost. HFSS high frequency simulator is employed to analyze the proposed antenna and simulated results on return loss, the E-and H-plane...
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