A. Asrokin

Comparison between Straight and U shape of Ultra Wide Band Microstrip Antenna using Log Periodic Technique

This paper described the design, simulation and fabrication of the ultra wideband (UWB) antennas for straight and U shape using seventeen elements log-periodic (LP) technique. The antennas have been modeled using microstrip lines and S parameter data from individual single element. The data is extracted from the momentum simulation and combined with the microstrip transmission line. The properties of antennas such as bandwidth return loss and radiation pattern have been investigated and compared between simulation and measurements. A bandwidth for UWB antenna is achieved using seventeen element arrays. The cross-polar isolation of the UWB antenna is in the range 8 to 20 (IB for straight shape. The typical half power bandwidth (HPBW) of the UWB antenna is 40deg. Furthermore, the return loss of the antenna is above -10 dB from both simulation and measurement..

Microstrip dipole antenna analysis with different width and length at 2.4 GHz

This paper discusses the design and simulation of microstrip dipole antenna at 2.4 GHz. In this antenna design, Agilents Advanced Design System (ADS) software using momentum simulation is employed to analyze the entire structure. Different width (W = 3, 5, 7, 9 mm) of the arm of dipole antenna is analyzed to study on the performance of frequency resonance. From the simulation, the wider the width will lower the resonance frequency of the antenna. Different width makes the frequency resonance of the antenna shifting lower or higher than 2.4 GHz. In this case, the length (L) of the dipole arm needs changes. Optimization value of the length is needed to make the frequency resonance at 2.4 GHz. The simulation result gives the bandwidth achieved of this microstrip dipole antenna is between 11 and 13 %. Three different width of dipole antenna have been fabricated and presented here in this paper. The properties of antenna such as input return loss and bandwidth have been investigated and compared between simulations

Dual band microstrip antenna for wireless LAN application

This paper discusses the design of the multiband microstrip antenna operating at frequency 2.4 GHz and 5.2 GHz. The aim of the project is to design a dual band microstrip antenna which will be operating in the wireless LAN band, IEEE 802.11 a/b/g. The dimensions of the single elements of the operating frequencies were calculated using transmission line model. Two elements of inset fed microstrip antenna were used for each frequency band. In this paper, there are four elements to cover the frequency band for WLAN application. The simulation process was done using the Agilent ADS software. The scaling factor of 1.03 has been chosen for the design starting from the lowest resonating frequency at 2.4 GHz band, while at 5.2 GHz band, the scaling factor is 1.05. The difference on the scaling factors was contributed by the losses that occurred when combining both of the antenna elements from both bands of frequency. The antenna has been fabricated on the FR4 microstrip board with epsitau = 4.5 and tan delta = 0.019 using the wet etching technique

Microstrip Patch Antenna Array at 5.8 GHz for Point to Point Communication

This paper described the design of microstrip patch array antenna with operating frequency at 5.8GHz for point to point communication. The array of four microstrip rectangular patch antennas with inset feed based on quarter-wave impedance matching technique were designed, simulated, fabricated and measured with the aid of microwave office software. The simulation and measurement result met the IEEE 802.11a standard and able to operate in upper UNII band for point to point communication. The 4times4 array has a return loss of -30.42 dB with 15% bandwidth. The gain obtained from simulation is 16 dB with 9deg half power beamwidth (HPBW)

Comparative radiation performance of different feeding techniques for a microstrip patch antenna

One of the important aspects of a microstrip patch antennas is the variety of feeding technique applicable to them. A good impedance matching condition between the line and patch without any additional matching elements depends heavily on feeding techniques used. This work is an effort to model and simulate three different types of microstrip antennas feeding methods on a rectangular patch. Simulation is done using the circuit model derived from the transmission line model (TLM), and is compared with another simulation set of feeding methods produced using the method of moments (MoM). Both methods are simulated on Microwave Office. This design intends to focus on designing the patch and its respective feeds, simulate it using method-of-moments (MoM), and fabricate it. Radiation measurements are also presented. Designs for each feeding technique achieved the best return loss at the desired frequency range, which is 2.4 GHz. The fabricated hardware produces good return loss and comparable radiative performance with simulation using MoM

Dielectric resonator antenna (DRA) for wireless application

This paper describes a simple design on dielectric resonator antenna using disk shape. The dielectric resonator antenna (DRA) consists of high dielectric constant materials, high quality factors and mounted on a grounded dielectric substrate of lower permittivity. The selected dielectric disk is operating at frequency of 2.4 GHz with dielectric constant of 34.73. The miscrostrip transmission line has been used as a feeding line for the resonator. The simulation process was done using Computer Simulation Technology (CST) Microwave Studio and Microwave office. The antenna has been fabricated on the FR-4 microstrip board using the wet etching technique. The DRA is operating at the frequency bands used for IEEE 802.11 b/g wireless LANs. The performance between simulation and measurement give a very good approximation result.

Microstrip dipole antenna for WLAN application

This paper describes numerical simulation, fabrication and experimental measurement of microstrip dipole antenna at 2.4 GHz for WLAN application. In this antenna design, Agilents ADS software using momentum simulation is employed to analyze the entire structure. The properties of antenna such as bandwidth, radiation pattern and half power beamwidth have been investigated and compared between simulation and measurements. The cross-polar isolation of the microstrip dipole antenna is in the range of 3 to 17.32 dB. The typical half power beamwidth (HPBW) of the microstrip dipole is 60° for E plane and 75° for H plane. Performance comparison between dipole and monopole antenna is also made in term of bandwidth and Input return loss.

Aperture Coupled Microstrip Antenna with Different Feed Sizes and Aperture Positions

The aperture coupled is one of the feeding techniques in micrsotrip antenna. The main mechanism of power transfer between its feed line and patch is the coupling mechanism. This paper describes two different designs of an aperture coupled microstrip patch antenna fabricated using different feed width, aperture size and position. In both proposed structures, the feed width of aperture coupled microstrip antennas (ACMAs) and aperture position are varied, while keeping tight to the three layer structure visible in conventional ACMAs (feed line at bottom most layer, ground plane with aperture in middle layer and patch layer at the top). The fabricated antenna produced better return loss and impedance bandwidth, while maintaining comparable radiation performance compared against simulation. All antennas produced maximum E- and H-plane co- and cross-polarization difference in the magnitude of -20dB and half-power beam widths (HPBW) of 90deg

Bandwidth Enhancement of a Narrowband Rectangular Microstrip Antenna on a Spiral Fan-Shape Electromagnetic Band-Gap (EBG) Patch Structure

An innovative and novel technique has been explored in enhancing the bandwidth of a rectangular patch antenna by introducing a spiral fan-shape electromagnetic band gap (EBG) structure between a narrowband patch antenna and its ground plane. Measured result shows an excellent return loss and good impedance matching which resulted in an increment of the bandwidth from about 4 % for a single layered narrow band rectangular microstrip patch, to more than 17 % after the EBG structure was introduced. This paper present the methodology, simulations and experimental works carried out in accomplishing the objective above. Microwave Office 2006 software has been used to initially simulate and find the optimum design and results

The studies on different scaling factor for microstrip antenna design

This paper had studied the effect of different scaling factor (tau) to microstrip log periodic antenna. Two value of scaling factor (tau) 1.02 and 1.05 had been studied. The bandwidth of the antenna has increase from 10.65% to 23.92% as bigger scaling factor were used. Five element antennas were applied in both designs. The simulation for the five elements was done using circuit simulator. The etching technique was applied in the fabrication process by using the FR4 microstrip board with dielectric constant 4.7 and loss tangent is 0.019. The properties of antenna such as bandwidth, gain, cross-polar isolation and half power beamwidth have been investigated and compared between simulation and measurements