Here we have shown the simplest form of patch antenna where the patch etched on the substrate is halfwavelength long while the thickness of the same is extremely less than also, excitation to the antenna is provided through feed lines connected to the patch. First the model of the microstrip patch antenna has to be drawn in hfss. Tutorial a practical guide to the design of microstrip antenna arrays roger hill philips research laboratories surrey, england a microstrip antenna array is one of the simplest forms of antennas available. The figure here represents the top view of the microstrip antenna. The basics of patch antennas, updated orban microwave. Particularly in cell phones, the designers are given very little space and want the antenna to be a halfwavelength long. Note that a quarterwave length transformer was used to match the patch to a 50 ohm feed line. Improving the efficiency of microstrip patch antennas springerlink. Deschamps in 1953, but didnt become practical until the 1970s when it was developed further by researchers such as robert e.
There are many applications where simple, highly efficient printed antennas mounted on high dielectric constant substrates are required. At 868 mhz, the calculated impedance of this small microstrip antenna is 1298j ohms. The measurement results show that the patch antenna efficiency at 2. I noticed that different patch shapes have dramatically different radiation efficiency. Generally, hemispherical coverage is provided by a patch antenna at an angle of 30. What is the best way to increase the efficiency of. The antenna may be excited using various methods pozar, 1992. The quality, bandwidth, and efficiency factors of typical patch designs are discussed. This page covers advantages and disadvantages of microstrip patch antenna. Their low profile design, often square or rectangular, allows them to be mounted to flat surfaces.
Click here to go to our page on circular patch antennas new for september 2018. The most commonly employed microstrip antenna is a rectangular patch which looks like a truncated microstrip transmission line. A microstrip or patch antenna is a lowprofile antenna that has a number of advantages over other antennas. It provides links on various topics on microstrip patch antenna. Microstrip antennas have become fashionable in some wireless communications systems, such as in the use of arrays with parabolic reflectors or even in the use of a patch antenna in the back of a cellular phone, as shown in figure 5. The patch of the antenna must be a very thin conductive region, t efficiency of microstrip antennas. Gain enhancement of a microstrip patch antenna using a reflecting. Advantages and disadvantages of microstrip patch antenna. The impedance of the antenna increases with higher permittivities. Secondly, the microstrip antenna was designed to operate at 100 mhz, but it is resonant at approximately 96 mhz. Microstrip dipole and conformal antennas are summarized. This study presents a new, simple method for improving the fronttoback fb ratio of a microstrip patch antenna msa based on surface wave suppression. The metal patch on the front surface can have various shapes, although a rectangular shape, as shown in figure 6.
Ill use the terms microstrip antenna and patch antenna interchangeably. The antenna has acceptable properties in terahertz frequency band. A microstrip or patch antenna is a lowprofile antenna that has a number of. Fb ratio of a microstrip patch antenna msa based on surface wave suppression.
It mentions microstrip antenna advantages or benefits and microstrip antenna disadvantages or drawbacks. In order to design a compact microstrip patch antenna, a substrate with a higher dielectric constant m icrostrip p atch a ntenna microstrip patch antenna consists of. The efficiency of several microstrip patch antennas with varying substrate heights etched on a substrate material with a relatively high dielectric constant was. The dimensions of antenna can be found in the hfss simulation file. A low profile, unidirectional, dual layer, and narrow bandwidth microstrip patch antenna is designed to resonate at 2. There are several reasons why microstrip antennas are so popular. Additional benefits of patch antennas is that they are easily fabricated making them cost effective. I know that surface wave contributes to the low radiation efficiency of microstrip antennas. Properties of a basic microstrip patch a microstrip or patch antenna is a lowprofile antenna that has a number of advantages. When air is used as the dielectric substrate, the length of the rectangular microstrip antenna is approximately onehalf of a freespace wavelength. The rectangular patch antenna is analyzed, and what is learned here will be applied to understanding pifas planar invertedf antennas. A practical guide to the designof microstrip antenna arrays. What is the best way to increase the efficiency of microstrip patch.
I want to know if there are other factors affect the radiation efficiency. In this section, well discuss the microstrip antenna, which is also commonly referred to as the patch antenna. One common approach is to feed from a microstrip line, connecting the microstrip antenna at the center of one of its edges. A microstrip patch antenna for optimum return loss, gain, directivity, efficiency and radiated power has been developed. Rectangular patch antennas are notoriously narrowband. The antenna consists of a single printed circuit board with an rf connector and perhaps an absorptive load. Finally, critical needs for further research and development for this antenna are identified.
Higher values of permittivity allow a shrinking of the patch antenna. Keywords radiation efficiency, rectangular microstrip patch antenna, resonating frequency, total efficiency. Various design for rectangular microstrip patch antenna, 1x1, 1x2, 2x2, 1x4, 2x4 and 4x4 rectangular. One possibility is to add a discrete matching network, which can be calculated as explained in chapter 1. Microstrip patch antennas or simply patch antenna are increasingly useful because the antenna is printed directly onto a circuit board. Radiation efficiency measurements of a microstrip antenna. In the proposed work an experimental design of microstrip patch antenna has been developed to study the various parameters controlling the performance of the antenna.
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