Definition

horn antenna

A horn antenna is used for the transmission and reception of microwave signals. It derives its name from the characteristic flared appearance. The flared portion can be square, rectangular, or conical. The maximum radiation and response corresponds with the axis of the horn. In this respect, the antenna resembles an acoustic horn. It is usually fed with a wave guide.

horn_antenna.gif (2247 bytes)

In order to function properly, a horn antenna must be a certain minimum size relative to the wavelength of the incoming or outgoing electromagneticfield. If the horn is too small or the wavelength is too large (the frequency is too low), the antenna will not work efficiently.

Horn antennas are commonly used as the active element in a dish antenna. The horn is pointed toward the center of the dish reflector. The use of a horn, rather than a dipole antenna or any other type of antenna, at the focal point of the dish minimizes loss of energy (leakage) around the edges of the dish reflector. It also minimizes the response of the antenna to unwanted signals not in the favored direction of the dish.

Horn antennas are used all by themselves in short-range radar systems, particularly those used by law-enforcement personnel to measure the speeds of approaching or retreating vehicles.

This was last updated in September 2005
Posted by: Margaret Rouse

Email Alerts

Register now to receive SearchMobileComputing.com-related news, tips and more, delivered to your inbox.
By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy

More News and Tutorials

  • Rugged mobile devices must be more than durable in harsh environments

    The durability of ruggedized mobile devices is only the first consideration for mobile managers with workers who take devices into hazardous environments. Connectivity, usability and portability are also important features.

  • Mobile phone beats out smartphone as device of choice

    Mobile phones edged out smartphones as the most commonly used devices in organizations, according to SearchMobileComputing.com's recent survey, which also found that many companies support any kind of devices brought in by users.

  • Mobile data services -- getting connected

    Mobile data computing continues to grow as more service providers offer services and at increasing speeds. Different ways to connect to the mobile data network are discussed in this tip by Paul DeBeasi.

Do you have something to add to this definition? Let us know.

Send your comments to techterms@whatis.com

There are Comments. Add yours.

 
TIP: Want to include a code block in your comment? Use <pre> or <code> tags around the desired text. Ex: <code>insert code</code>

REGISTER or login:

Forgot Password?
By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy
Sort by: OldestNewest

Forgot Password?

No problem! Submit your e-mail address below. We'll send you an email containing your password.

Your password has been sent to: