Lab Report

Microstrip antennas are low profile, conformable to planar and non planar surfaces, simple and inexpensive to manufacture using modem printed-circuit technology, mechanically robust and compatible with MMIC designs. When the particular patch shape and mode are selected they are very versatile in terms of resonant frequency, polarization, pattern and impedance. In addition by adding loads between the patch and the ground plane, such as pins and varactor diodes. adaptive elements with variable resonant frequency, impedance, polarization and pattern can be designed. Since it is of planar structure, it has all the advantages of printed circuit technology. The major operational disadvantages of microstrip antennas

Microstrip antenna has quickly evolved from academic novelty to commercial reality with applications in a wide variety of microwave systems. In fact rapidly developing markets in a personal communications systems

• GPS Antenna - for connecting with the local telecommunication towers and for getting coordinates from the satellite

The planar antenna configurations such as microstrip and patch antennas have been found suitable for such systems. These antenna configurations are of low profile, lightweight, simple and inexpensive to fabricate. The main design goal of antenna design for modern communication systems is to achieve the better performance for desired frequency bands. But the main disadvantage of using microstrip antenna for recent day’s wireless communication is to achieve multi frequency operation with single antenna, maintaining the performance the antenna for all desired frequency.

The antenna’s complete behaviour, including frequency dependency, can be described by the antenna the linear system theory.

In order to simplify analysis and performance prediction, the patch is generally square, rectangular, circular, triangular and elliptical or some other common shape as shown in figure 1.2. In the work, circular and rectangular microstrip antenna both loaded with U-slot are the ones under consideration. The height (h) of the dielectric substrate is usually 0.003 λ0 ≤ h ≤ 0.05 λ0. The dielectric constant of the substrate (εr) is typically in the range 2.2 ≤ εr ≤ 12.

The rectangular microstrip patch antenna on the unity permittivity substrate within the internal U-shaped slot. Recently, the researchers had proposed the similar design on the microwave substrate, that was better preserve the thin profile characteristics. These researches had focused the almost entirely on the top plate of the antenna element, while the effect of the size of the ground plane on which they are mounted had not been the fully studied. According to the published literature reducing the size of the ground plane and the making of the ground plane resonate at the desired frequency, both the bandwidth enhancement and the size reduction could be

PAI YEN CHEN et al[1] The possibility offered by the elliptical geometry to operate as a dual-band antenna with resonance at design frequency fo=0.4 GHZ and fe=0.6GHZ,fo and fe

Abstract— A design of a microstrip rectangular patch antenna is presented in this paper. The proposed antenna was simulated using Computer Simulation Technology (CST) CAD Package and design on a microstrip with relative permittivity of 4.6, and substrate and copper thickness of 0.5 mm and 0.035 mm respectively with 4.5 GHz of frequency.

Recently in 2010, Hocine Kimouche, Djamel Abed and Brahim Atrouz from the Laboratory of the Microwave and Radar, Ecole Militarie Polytechnique ( EMP), Algeria proposed the novel microstrip patch antenna design within the inverted stepped cone slot ground antenna. The dependence of the bandwidth on the main parameters design had been investigated. It would found that by choosing the suitable combinations of the feed and slot shapes and the tuning their sizes, the optimum operating bandwidth could be obtained. The proposed antenna has an omni-directional pattern at (x-y) plane for all the measured impedance bandwidth, which are covered the commercial Ultra-wide band.

Structure of single patch antenna with inset feed is shown in figure 1. The Antenna is composed of patch, substrate, ground and feeding network. The performance of antenna generally depends on dimensions of above components

As we all know, Selection of antenna is very important in designing of successful rectenna because antenna is responsible for how much power is received by the circuitry following after the antenna. This chapter describes the theory of antenna and its property, design process, simulations and fabrication of an Microsrip antenna that operates within the microwave frequency range. First we start with a brief explanation of the main design parameters of an antenna then we briefly explain the advantages of using microstrip antennas in these applications [4-18]. Also a brief introduction of the software used for the design and simulations stages. Then we will explain how making some changes to the shape of the ground plane and the radiating patch of the antenna can improve the performance. After all the parametric simulations a final antenna version was chosen and subsequently built.

Keywords:-Dual U- Slot Loaded Stacked Patch, H-Slot loaded Fed Patch, RL(Return Loss), IE3D,Microstrip Patch antenna, Multiband Antenna

The main aim of this paper is to give overview on Micro strip patch antenna design using different defected ground structures for improving the performance parameters of the antenna such as Gain, Directivity, and Voltage Standing Wave Ratio. Return Loss. By giving proper patch length ,patch width, substrate material such as FR4 with dielectric constant 4.4 and thickness 1.6mm,boundary material such as Vacuum/air, most important the patch material such as nickel and by adding array with DGS we can improve the performance of patch antenna.

The main aim of this paper is to give overview on Micro strip patch antenna design using different defected ground structures for improving the performance parameters of the antenna such as Gain, Directivity, and Voltage Standing Wave Ratio. Return Loss. By giving proper patch length ,patch width, substrate material such as FR4 with dielectric constant 4.4 and thickness 1.6mm,boundary material such as Vacuum/air, most important the patch material such as nickel and by adding array with DGS we can improve the performance of patch antenna.