Dipole loop (folded dipole) or mono pole loop: Antenna Design Theory and Experimental Data
The standard dipole is widely used in its basic form. However under a number of circumstances a modification of the basic dipole, known as a folded dipole antenna provides a number of advantages. The folded dipole antenna or folded dipole aerial is widely used, not only on its own, but also as the driven element in other antenna formats such as the Yagi antenna.
Folded dipole advantages:
There are a number of advantages or reasons for using a folded dipole antenna:
- Increase in impedance: When higher impedance feeders need to be used, or when the impedance of the dipole is reduced by factors such as parasitic elements, a folded dipole provides a significant increase in impedance level that enables the antenna to be matched more easily to the feeder available.
- Wide bandwidth: The folded dipole antenna has a flatter frequency response - this enables it to be used over a wider bandwidth
The reported patent [Patent number: US 6947007] desribes the invention which relates to dipole and monopole loops with a much shortened emitter relative to the theoretical length thereof and electrically extended at the ends thereof by non-emitting conductor pieces. In this lecture, speaker will be discussing about the know-how and design techniques for the realization of both passive and active antenna.
Date and Time
Location
Hosts
Registration
- Date: 06 Mar 2017
- Time: 09:00 AM UTC to 10:00 PM UTC
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- Synergy Microwave Corp
- Paterson, New Jersey
- United States 07504
- Building: 201 McLean Boulevard
- Contact Event Host
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Ajay Kumar Poddar, Phone: (201)560-3806) (Email: akpoddar@ieee.org)
- Co-sponsored by MTT/AP-S (Chair-Dr. Ajay K. Poddar)
- Starts 27 February 2017 02:00 PM UTC
- Ends 02 March 2017 05:00 PM UTC
- No Admission Charge
Speakers
Ulrich Rohde
Dipole loop (folded dipole) or mono pole loop: Antenna Design Theory and Experimental Data
A dipole loop or folded dipole consists of two closely adjacent lambda/2 dipoles, connected at the ends, but only one of which is fed. The same current direction is set on the dipoles. Both dipoles support one another in their action. By means of different thicknesses of the two dipoles the input impedance can be influenced via transformatory effects. A so-called monopole loop, which can be interpreted as a half dipole loop on a conducting plane and consists of two lamda/4 long dipoles, which again are arranged closely adjacent and are connected to one another at the upper end, acts on the same principle. Dipole or monopole loops of this kind on a conducting plane are used as transmitting and receiving aerials in the short- and ultra-short-wave range in various embodiments.
Radio operation is also carried out in the so-called threshold wave range in amateur and also military radio. The lowest practical frequency is approximately 1.5 MHz, which corresponds to a wavelength of just under 200 meters. A conventional lambda/2 aerial would consequently have a length of approximately 100 meters, the implementation of which as a horizontal or vertical aerial means a considerable mechanical outlay. It is known to shorten such aerials mechanically with respect to their theoretical length and to balance the associated disadvantage in efficiency by suitable measures, such as roof capacities and/or series inductivities, but these known solutions also require a further considerable outlay, especially with, an aerial in multi-band operation.
Biography:
Prof. Dr.-Ing. habil. Dr. h.c. mult. Ulrich L. Rohde is a Chairman of Synergy Microwave Corp., Paterson, New Jersey; President of Communications Consulting Corporation, serving as an honorary member of the Senate of the Department of Defense University Munich ,honorary member of the Senate of the Brandenburg University of Technology Cottbus–Senftenberg , Germany; past member of the Board of Directors of Ansoft Corporation, Pittsburgh, Pennsylvania; and is a partner of Rohde & Schwarz, Munich, Germany.
Email:
Address:Brandenburgische Technische Universitat, BTU Cottbus, Cottbus, Brandenburg, Germany, 03013
Ulrich Rohde
Dipole loop (folded dipole) or mono pole loop: Antenna Design Theory and Experimental Data
Biography:
Email:
Address:Cottbus, Brandenburg, Germany
Agenda
4:00PM-5:00PM: Talk You don't have to be IEEE member to attend the talk.