Question: How Does A Patch Antenna Work?

What is meant by microstrip patch antenna?

It is a kind of internal antenna.

They are mostly used at microwave frequencies.

An individual microstrip antenna consists of a patch of metal foil of various shapes (a patch antenna) on the surface of a PCB (printed circuit board), with a metal foil ground plane on the other side of the board..

Why we use fr4 substrate?

Abstract: FR4 epoxy glass substrates are the material of choice for most PCB applications. The material is very low cost and has excellent mechanical properties, making it ideal for a wide range of electronic component applications.

How do I increase the bandwidth of a microstrip patch antenna?

2. Intrinsic techniques. Two intrinsic procedures can be applied to improve the bandwidth of a single layer direct fed microstrip patch antenna. One is increasing the substrate thickness and the other is decreasing the dielectric constant of antenna substrate (relative permittivity of near to one).

What is substrate in antenna?

The substrate in microstrip antennas is principally needed for the mechanical support of the antenna. To provide this support, the substrate should consist of a dielectric material, which may affect the electrical performance of the antenna, circuits and transmission line.

What is the radiation pattern of an antenna?

In the field of antenna design the term radiation pattern (or antenna pattern or far-field pattern) refers to the directional (angular) dependence of the strength of the radio waves from the antenna or other source. … Other software, like HFSS can also compute the near field.

How does a patch antenna radiate?

Antenna Gain The input power is transformed into radiated power and surface wave power while a small portion is dissipated due to conductor and dielectric losses of the materials used. Surface waves are guided waves captured within the substrate and partially radiated and reflected back at the substrate edges.

Are patch antennas directional?

For example, some patch antennas are approximately half a wavelength on each side. The polarization can be either circular or linear depending on the design of the patch. In a patch antenna, most of the propagation is above the ground plane and can have high directional gain.

How do I increase the gain on my patch antenna?

Antenna gain is related to the antenna type, FR4 is lossy material therefore you can not expect large gain from FR4. A single patch antenna on FR4 can produce gain of 3-5dBi. Air as a substrate can give you maximum gain for a specific design since it has no dielectric loss.

What is a good antenna gain?

The gain of a real antenna can be as high as 40-50 dB for very large dish antennas (although this is rare). Directivity can be as low as 1.76 dB for a real antenna (example: short dipole antenna), but can never theoretically be less than 0 dB.

What is the VSWR of an antenna?

VSWR (Voltage Standing Wave Ratio), is a measure of how efficiently radio-frequency power is transmitted from a power source, through a transmission line, into a load (for example, from a power amplifier through a transmission line, to an antenna).

What does a patch antenna do?

A patch antenna or microstrip antenna is a narrowband, wide-beam antenna. It is also-called printed antenna. It has two dimensional physical geometry. The simplest patch antenna uses a patch which is one-half wavelength long, so that the metal surface acts as a resonator similarly to the half-wave dipole antennas.

What is rectangular patch antenna?

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.

What are the two types of radiation pattern?

Radiation Pattern in 2D Two-dimensional pattern can be obtained from three-dimensional pattern by dividing it into horizontal and vertical planes. These resultant patterns are known as Horizontal pattern and Vertical pattern respectively.

Which antennas are renowned as patch antennas especially adopted for space craft applications?

45) Which antennas are renowned as patch antennas especially adopted for space craft applications? ANSWER: Microstrip 46) Which conversion mechanism is performed by parabolic reflector antenna?

How many types of antennas are there?

There are several different types of antennas in three broad categories: omni-directional, directional, and semi-directional. – Omni-directional antennas propagate in all directions. – Semi-directional antennas propagate in a constricted fashion, defined by a specific angle.

How do you make a microstrip patch antenna?

Using the equations mentioned above, a square microstrip patch antenna is designed at a resonant frequency of 2.4 GHz. The length width (W) and length (L) of the patch at a resonant frequency of 2.4 GHz is found to be 38 mm while the feeding offset position is 6 mm. the height of the substrate is 3 mm.

What is feeding techniques in antenna?

This paper describes the feeding techniques for various Microstrip patch antennas. … In general contacting methods are microstrip line feed and co-axial plane feed. On other hand, non- contacting techniques are aperture coupled feed and proximity coupled feed.