Results 281 to 290 of about 2,076,516 (339)

Feed optimization in multi-feed antennas

WESCON/57 Conference Record, 1957
The problem of attaining close beam spacing and high crossover levels in multi-beam antennas is discussed with attention directed toward the mutual effects of the several feeds. A series of measured curves is used to present the mutual coupling effects on the primary feed patterns.
openaire   +1 more source

Primary feed antennas

1982
In a quasi-optical antenna system, it makes little difference, so far as the illumination characteristics of the feed are concerned, whether the collimating device is reflective (i.e. single or multiple mirrors) or refractive (i.e. a lens). In either case it is the function of the feed to provide a radiation pattern which is largely confined to the ...
A. W. Love, A. W. Rudge, A. D. Olver
openaire   +1 more source

Proximity feed microstrip antenna

Electronics and Communications in Japan (Part I: Communications), 1986
AbstractThe proximity feed microstrip antenna (PMA) fed via a gap enables switching of the polarization with a simple operation of opening or shorting the end of the feed. However, since the PMA is coupled electromagnetically with the feed line printed on the same surface as the antenna, the effect of the feed line on the antenna characteristics is ...
Katsuyuki Haishi, Kiyohiko Itoh
openaire   +1 more source

Dual feed monopole antenna

IEE Proceedings - Microwaves, Antennas and Propagation, 2003
A new dual feed antenna element is presented, consisting of a single antenna element with two matched and isolated ports. Matching, bandwidth, and losses are comparable to a standard dipole. The radiation patterns are highly omnidirectional with linear polarisation. The antenna can be implemented both with and without a groundplane.
P. Hallbjörner, P. Hallbjörner
openaire   +1 more source

Transparent antenna with conical feed

2013 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS 2013), 2013
An equation for the current along a transparent radiator is written and solved. Based on this solution the current distribution along the radiator axis is analyzed. It is shown that the current decays abruptly along the radiator. For this reason the transmitted signal depends weakly on the radiator length.
Boris Levin, Motti Haridim, Stefan Chulski   +2 more
openaire   +1 more source

Feeding networks for sinuous antennas

Microwave and Optical Technology Letters, 1999
Reference LEMA-ARTICLE-1999-002doi:10.1002/(SICI)1098-2760(19990205)20:3 3.0.CO;2-C Record created on 2006-11-30, modified on 2016-08 ...
Ph. Gonnet, A. Sharaiha, C. Terret, A. Skrivervik   +3 more
openaire   +1 more source

Conical feed transparent antenna

2012 IEEE 27th Convention of Electrical and Electronics Engineers in Israel, 2012
A transparent antenna using conical metallic feed is proposed. Characteristics of transparent conductive films are revised. It is verified that the sheet resistivity of a conductive transparent layer differs significantly from that of a metallic (copper) layer with a thickness equal to the penetration depth.
B. Levin, M. Haridim
openaire   +1 more source

A Quadband Antenna With Reconfigurable Feedings

IEEE Antennas and Wireless Propagation Letters, 2009
A compact inverted-F antenna (IFA) with switchable feeds is proposed in this letter. The antenna occupies a relatively small volume of 50 times 7 times 7 mm3. Two pin diodes are used to switch the antenna between two different working states. The antenna can provide the required bands of GSM850 (824-894 MHz), GSM900 (890-960 MHz), DCS (1710-1880 MHz ...
null Yue Li, null Zhijun Zhang, null Wenhua Chen, null Zhenghe Feng, M.F. Iskander   +4 more
openaire   +1 more source

Dielectric Feeds for Reflector Antennas

1975 5th European Microwave Conference, 1975
Special dielectric antennas used as elements for a feed of multi-beam or limited-scan reflector antennas have been developed. As a result of the close arrangement of the feed elements, their cross-sectional dimensions must be small and their mutual coupling should be as low as possible.
openaire   +1 more source

Linear-array antennas and feeds

1984
The problems and techniques of linear-array design have been divided in this chapter into three general parts. The first concerns itself with general pattern theory, that is, the relation between the far-zone pattern of an array and the amplitude and phase distribution among the elements and their spacing; in this section no attention is paid to the ...
J. E. Eaton, L. J. Eyges, G. G. Macfarlane   +2 more
openaire   +1 more source