Results 261 to 270 of about 27,684 (298)

Sphero-conical spiral antenna

Proceedings of International Conference on Antenna Theory and Techniques, 2009
The mathematical model of radiation characteristics of the sphero-conical helical antenna in the form of extending conductors is offered. This model allows not only to simplify an essentially calculation, but the analysis of similar structures. The results of theoretical and experimental research of the sphero-conical helical antenna are also discussed
Lukjanchikov, A. V., Salazko, V. N., Evstigneev, I. A.   +2 more
openaire   +1 more source

Natural and metamaterial spiral antennas

2012 IEEE International Workshop on Antenna Technology (iWAT), 2012
A low-profile cavity-backed spiral antenna with an absorbing strip exhibits wideband radiation characteristics. An EBG reflector is useful in designing a small spiral for medium frequency bandwidth operation. A modified EBG reflector contributes to mitigation of the partial deterioration of the antenna characteristics in a low-profile equiangular ...
H. Nakano, J. Miyake, M. Oyama, J. Yamauchi   +3 more
openaire   +1 more source

Frequency-Reconfigurable Archimedean Spiral Antenna

IEEE Antennas and Wireless Propagation Letters, 2013
In this letter, a frequency-reconfigurable Archimedean spiral antenna is presented. The proposed antenna consists of a two-arm spiral fed by a coplanar waveguide (CPW) feeding line. A pair of meandered slotlines is implemented at both sides of the CPW-fed slot on the spiral antenna to introduce frequency reconfiguration.
F. D. Dahalan, S. K. A. Rahim, M. R. Hamid, M. A. Rahman, M. Z. M. Nor, M. S. A. Rani, P. S. Hall   +6 more
openaire   +1 more source

Ultra-wideband planar spiral antenna

2011 MICROWAVES, RADAR AND REMOTE SENSING SYMPOSIUM, 2011
The original ultra-wideband impedance transformer providing the required electromagnetic matching of the coaxial cable with the dual-arm spiral antenna is proposed. The calculated input reflection coefficient of the spiral antenna with transformer is less than −10dB within the frequency band from 10GHz to 110GHz.
I. Ivanchenko, V. Pishchikov, N. Popenko
openaire   +1 more source

A single-arm spiral antenna

1992 Symposium on Antenna Technology and Applied Electromagnetics, 1992
An array consisting of four-by-four spiral antennas is constructed using the pair-element (PE) technique. The 3-dB axial ratio bandwidth is improved to 8.9% by the PE technique from 3.8% for an array without using the PE technique. The −14-dB return loss bandwidth is widened to 6.4% from 3.6%.
H. Nakano, K. Nakayama, H. Mimaki, I. Yamauchi, K. Hirose   +4 more
openaire   +1 more source

Design of Spiral Antenna

2023 IEEE Wireless Antenna and Microwave Symposium (WAMS), 2023
G. Vaishnavi, B.Pavan Kumar, P. Susmitha, A. Bharathi   +3 more
openaire   +1 more source

Single Wire Archimedian Spiral Antenna

IETE Journal of Research, 1969
The construction of a single wire unbalanced Archimedian spiral antenna is described. The experimentally observed characteristics of the antenna indicate that the antenna has a pattern and impedance bandwidth of approximately 1–5. The axial ratio of the radiation along the axis is constant (approximately 2 or less) over a frequency band of 1–2.
openaire   +1 more source

Dual spiral antenna

1987 Antennas and Propagation Society International Symposium, 2005
H. Nakano, Y. Minegishi, J. Yamauchi
openaire   +1 more source

Sunflower spiral antenna

1980 Antennas and Propagation Society International Symposium, 1980
H. Nakano, J. Yamauchi
openaire   +1 more source

Microstrip spiral antennas

1979 Antennas and Propagation Society International Symposium, 2005
A. Van de Capelle, J. De Bruyne, M. Verstraete, H. Pues, J. Vandensande   +4 more
openaire   +1 more source