Design of UWB antennas with single or multi notch bands are also considered. Recent applications such as, cognitive radio, reconfigurable antennas, wearable antennas, and flexible antennas are presented. The book audience will be comprised of electrical and computer engineers and other scientists well versed in microstrip antenna technology.
- Applications Of Microstrip Patch Antenna
- Application Of Microstrip Patch Antenna Using Hfss
- Microstrip Patch Antenna Design
A patch antenna is a type of radio antenna with a low profile, which can be mounted on a flat surface. It consists of a flat rectangular sheet or 'patch' of metal, mounted over a larger sheet of metal called a ground plane. They are the original type of microstrip antenna described by Howell in 1972;[1] the two metal sheets together form a resonant piece of microstriptransmission line with a length of approximately one-half wavelength of the radio waves. The radiation mechanism arises from discontinuities at each truncated edge of the microstrip transmission line.[2] The radiation at the edges causes the antenna to act slightly larger electrically than its physical dimensions, so in order for the antenna to be resonant, a length of microstrip transmission line slightly shorter than one-half the wavelength at the frequency is used. The patch antenna is mainly practical at microwave frequencies, at which wavelengths are short enough that the patches are conveniently small. It is widely used in portable wireless devices because of the ease of fabricating it on printed circuit boards. Multiple patch antennas on the same substrate (see image) called microstrip antennas, can be used to make high gainarray antennas, and phased arrays in which the beam can be electronically steered.
A variant of the patch antenna commonly used in mobile phones is the shorted patch antenna, or planar inverted-F antenna (PIFA). In this antenna, one corner of the patch (or sometimes one edge) is grounded with a ground pin. This variant has better matching than the standard patch.Another variant of patch antenna with the partially etched ground plane, also known as printed monopole antenna, is a very versatile antenna for dual-band operations.[3]
See also[edit]
- Microwave Radiometer (Juno) (Space probe instrument, uses patch array antennas)
References[edit]
- ^'Microstrip Antennas,' IEEE International Symposium on Antennas and Propagation, Williamsburg Virginia, 1972 pp. 177-180
- ^'Radiation from Microstrip Radiators,' IEEE Transactions on Microwave Theory and Techniques, April 1969, Vol. 17, No. 4 pp.235-236
- ^J. R. Panda, Rakhesh Singh Kshetrimayum, 'A Printed 2.4 GHz/5.8 GHz Dual-band Monopole Antenna with a Protruding Stub in the Ground Plane for WLAN and RFID Applications, ' Progress In Electromagnetics Research, vol. 117, pp. 425-434, 2011
External links[edit]
- Patch Antenna Tutorial EM Talk
- Antenna Theory Tutorial
- Antenna Basic Terms
- Types of Antennas
- Antenna Arrays
- Wave Propagation
- Antenna Theory Useful Resources
- Selected Reading
Micro strip antennas are low-profile antennas. A metal patch mounted at a ground level with a di-electric material in-between constitutes a Micro strip or Patch Antenna. These are very low size antennas having low radiation.
Frequency Range
The patch antennas are popular for low profile applications at frequencies above 100MHz.
Construction & Working of Micro strip Antennas
Micro strip antenna consists of a very thin metallic strip placed on a ground plane with a di-electric material in-between. The radiating element and feed lines are placed by the process of photo-etching on the di-electric material. Usually, the patch or micro-strip is choosen to be square, circular or rectangular in shape for the ease of analysis and fabrication. The following image shows a micro-strip or patch antenna.
The length of the metal patch is 位/2. When the antenna is excited, the waves generated within the di-electric undergo reflections and the energyis radiated from the edges of the metal patch,which is very low.
Radiation Pattern
The radiation pattern of microstrip or patch antenna is broad. It has low radiation power and narrow frequency bandwidth.
The radiation pattern of a microstrip or patch antenna is shown above. It has lesser directivity. To have a greater directivity, an array can be formed by using these patch antennas.
Advantages
The following are the advantages of Micro strip antenna −
- Lighteweight
- Low cost
- Ease of installation
Applications Of Microstrip Patch Antenna
Disadvantages
The following are the disadvantages of Micro strip antenna −
- Inefficient radiation
- Narrow frequency bandwidth
Applications
Application Of Microstrip Patch Antenna Using Hfss
The following are the applications of Micro strip antenna −
Microstrip Patch Antenna Design
- Used in Space craft applications
- Used in Air craft applications
- Used in Low profile antenna applications