Journal ArticleDOI
Four-Armed Spiral-Helix Antenna
TLDR
In this paper, the union of a four-armed, reflective-backed spiral antenna with a top-fed quadrifilar helix, operating over the 0.35-2.6 GHz band, is presented.Abstract:
An antenna formed by the union of a four-armed, reflective-backed spiral antenna with a top-fed quadrifilar helix, operating over the 0.35-2.6-GHz band, is presented. The antenna features a novel dual-layering scheme that allows the modal impedance of the four-armed spiral to be greatly reduced while maintaining the desirable self-complementary metallization. A reconfigurable end-loading scheme is also presented that allows the attachment of high power-handling resistive loads, which along with other design features enables the use of the antenna in high-power transmitting applications. Mode 1 VSWR less than 2.2 is maintained throughout the 0.35-2.6-GHz band. Respective cutoff and nominal gains of 0 and 7 dBiC with excellent pattern characteristics are demonstrated. Over 30 dB broadside cross-polarization discrimination and high conical pattern uniformity are also obtained.read more
Citations
More filters
Journal ArticleDOI
Wideband Monostatic Simultaneous Transmit and Receive (STAR) Antenna
TL;DR: In this paper, a monostatic ultra-wideband simultaneous transmit and receive (STAR) antenna subsystem is introduced, which is configured such that one arm-pair is used for TX and the other for RX.
Journal ArticleDOI
Wideband Multimode Monostatic Spiral Antenna STAR Subsystem
TL;DR: In this paper, a wideband, multimode, and monostatic simultaneous transmit and receive (STAR) antenna subsystem is proposed, which consists of a single four-arm spiral and two analog circuit layers designed to maximize isolation between the transmitting (TX) and receiving (RX) channels.
Journal ArticleDOI
Four-Arm Spiral Antenna Fed by Tapered Transmission Line
TL;DR: In this article, a four-arm Archimedean spiral antenna with a novel integrated tapered transmission line feed structure is presented, which achieves a return loss of greater than 15 dB and a 3-dB broadside axial ratio throughout the 0.8-3 GHz band.
Journal ArticleDOI
Meander Dipole Antenna to Increase CW THz Photomixing Emitted Power
Javier Montero-de-Paz,E. Ugarte-Munoz,Luis Enrique Garcia-Munoz,Iván Cámara Mayorga,Daniel Segovia-Vargas +4 more
TL;DR: In this paper, the authors proposed an active integrated antenna (AIA) for continuous-wave (CW) photomixing with the main objective to maximize the total efficiency and, as a consequence, the emitted power.
Journal ArticleDOI
Simply-Fed Four-Arm Spiral-Helix Antenna
TL;DR: In this paper, an ultra-wideband four-arm spiral-helix antenna with simple beamformer is developed to have simultaneously good performance in time and frequency, and two microstrip feeds printed on the opposite side of the spiral with impedance following Klopfenstein taper are employed to eliminate the need for 180 ° hybrid beamformers.
References
More filters
Book
Frequency independent antennas
TL;DR: In this article, it was shown that the pattern converges to the characteristic pattern as the frequency is raised, if a is not \infty, and that the impedance converges with the characteristic impedance for all a, assuming a to be positive, \varpi ranges from - ∞ to some finite value which determines the low frequency limit.
Journal ArticleDOI
Impedance properties of complementary multiterminal planar structures
TL;DR: In this paper, a relation between the impedance matrices of two complementary n-terminal structures has been found between Babinet's principle, properly extended to electromagnetic fields, leading to a simple relation between impedances of two planar complementary structures.
Journal ArticleDOI
A solution to the frequency-independent antenna problem
B. Cheo,V. Rumsey,W. J. Welch +2 more
TL;DR: In this article, a solution of Maxwell's equations is obtained for an antenna consisting of an infinite number of equally spaced wires in the form of coplanar equiangular spirals, and the current consists of an inward traveling wave at infinity when the antenna is excited in that sense which produces an outward wave at the center.
Journal ArticleDOI
Various modes of the equiangular spiral antenna
TL;DR: In this paper, the 2-, 4-and 6-arm planar spiral antennas were excited by various feeding arrangements, and the pattern, phase variation and polarization of their fields were measured.
Journal ArticleDOI
Pattern Purity of Coiled-Arm Spiral Antennas
TL;DR: In this paper, the effects of the coil-type arm treatment on the far-field characteristics of spiral antennas excited in the broadside mode (also referred to as Mode 1) are discussed.
Related Papers (5)
Design of a wide-band L-probe patch antenna for pattern reconfiguration or diversity applications
S.-L.S. Yang,Kwai-Man Luk +1 more