Topic
Active antenna
About: Active antenna is a research topic. Over the lifetime, 2246 publications have been published within this topic receiving 26493 citations.
Papers published on a yearly basis
Papers
More filters
Patent•
01 Apr 1985TL;DR: In this paper, a five horn monopulse primary feed array is exemplified, where a unique coax-to-ridge waveguide input coupler and an extended ridge matching section at the radiating apertures provide the extended frequency range.
Abstract: An array of five, ridge waveguide horns provides monopulse operation over awo octave range. A unique coax-to-ridge waveguide input coupler and an extended ridge matching section at the radiating apertures provide the extended frequency range. The horn assembly is lightweight, compact and suitable for array applications. A five horn monopulse primary feed array is exemplified.
13 citations
TL;DR: In this article, a polarisation-agile active patch antenna with a compact layout has been developed, consisting of a square patch with an overlay, it has two transistors in the common base configuration, connected on adjacent sides to excite orthogonal modes of oscillation.
Abstract: A polarisation-agile active patch antenna with a compact layout has been developed. Comprising a square patch with an overlay, it has two transistors in the common base configuration, connected on adjacent sides to excite orthogonal modes of oscillation. Circular polarisation of either sense, and linear polarisation parallel to either patch side or diagonal, can be radiated.
13 citations
25 Nov 2013
TL;DR: Simulation results show that users at traffic hot spot areas suffering from resource sharing can achieve significant performance gains from traffic oriented tilt optimization.
Abstract: Performance and efficiency of a cellular network can be enhanced by properly adjusting the antenna tilt setting. Antenna tilt is one of the most important radio parameters that determines the service coverage boundary and level of inter-cell-interference in cellular systems. Moreover, tilt tuning is an effective technique in radio network optimization to effect a better load balance among cells for efficient utilization of spare radio resources. The variability of user traffic distribution makes it more challenging to operators to ensure the required service capacity and quality with acceptable capital and operational expenditures. Active Antenna System (AAS) features promise the ability to flexibly handle system capacity by adapting the orientation of the antenna beam. In this paper, the potential performance gains of tilt optimization for differently placed user traffic concentrations are investigated. Simulation results show that users at traffic hot spot areas suffering from resource sharing can achieve significant performance gains from traffic oriented tilt optimization.
13 citations
TL;DR: It is indicated that indented the radiating edges of the patch element works more effectively on the control of spurious modes while indenting the non-radiating edges can eliminate the harmonics by shifting down the fundamental mode.
Abstract: In rectifying or active antenna systems, the higher order modes can hamper the system efficiency, and thus, the filter antennas are used to eliminate the harmonic radiation. In this paper, the distribution of standing wave fields in patch antenna having been presented and then the characteristic mode theory having been employed, the influences of feeding location and the indentation of patch edges on the suppression of higher order harmonics and their spurious modes are investigated. It is indicated that indenting the radiating edges of the patch element works more effectively on the control of spurious modes while indenting the non-radiating edges can eliminate the harmonics by shifting down the fundamental mode. By selecting feed position and indenting the patch edges, a microstrip patch antenna with both harmonic and spurious mode controls is proposed.
13 citations
TL;DR: In this article, a new active antenna structure with applications in quasi-optical power combining is described, which combines a slotline FET oscillator with a notch antenna and is successfully used to create both E-plane and H-plane linear arrays as well as a 2D array.
Abstract: A new active antenna structure with applications in quasi-optical power combining is described. The active antenna combines a slotline FET oscillator with a notch antenna. The new structure was successfully used to create both E-plane and H-plane linear arrays as well as a 2D array. Preliminary results of radiation patterns and the power combining efficiencies of the arrays are discussed. >
13 citations