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The paper presents general properties of arrays of connected slot or dipole antennas providing guidelines for the design of structures. Connected arrays represent one of the most promising array antenna concepts able to meet the very demanding requirements in terms of antenna bandwidth and high polarization purity, imposed by the new generations of...
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... array can be seen as an evolution of the so called self-complementary antennas. These latter are structures whose shape is identical to that of a complementary one, obtained by simply reversing the metallic and non metallic parts (see for example Figure 2). The principle and the properties of self complementary antennas were introduced for the first time in the late forties by Y. Mushiake [1]. ...
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Citations
This paper presents a dual-polarized Frequency-scaled Ultra-wide Spectrum Element (FUSE) array on a triangular lattice, precision-machined from an Aluminum block as a self-supporting structure, similar to all-metal Vivaldi arrays reported by the authors in past work. Whereas dual-polarized FUSE arrays normally consist of offset radiator pairs conforming to the ubiquitous square-lattice egg-crate configuration and capacitively coupled at the ends to achieve ultra-wideband operational frequency ranges, this work is novel in that it uses conventional manufacturing to directly machine the dual-polarized FUSE array on a triangular lattice instead. Triangular lattices for dual-polarized wideband arrays are uncommon in the literature and have the benefit of 15.5% reduction in element counts over a square lattice aperture of the same footprint and upper frequency of operation, making this a useful development for applications requiring minimum element counts, i.e., reduced cost/weight. In this paper, embedded element performance predictions for the dual-polarized triangular-lattice FUSE array are presented and validated with measurements of a hardware prototype. Results show similar overall grating-lobe-free performance to a square lattice FUSE array of the same footprint and operational frequencies reported in earlier work. The asymmetries of the triangular lattice result in relative performance degradation vs. square lattice FUSE arrays as a trade-off to the benefit of reduced element counts for apertures of similar size.
This paper presents a design of an antenna feed that suppresses common-mode resonances commonly encountered in connected antenna arrays. The design makes use of symmetrical wideband microstrip-slotline transitions to cancel out common-mode signals, while differential signals will still propagate through. The design is verified using both simulations and measurements of a manufactured prototype. A wide bandwidth and a CMRR > 30 dB is achieved that exceeds the design specifications set out.
Resistively loaded radiators, known as dummy elements, often are used to improve the active match of receive array edge elements. We discuss the use of dummy elements for transmit array operation and explain that, because these elements do not transmit their own signals, they cannot improve significantly the match of transmitting edge elements. We also discuss two second order effects involving dummy elements: (1) edge element match perturbation from imperfectly matched dummies and (2) perturbation of radiator self-match in an open radiator structure such as a connected array.
