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The wavelength-scaled array architecture reduces element count and associated T/R module costs by replacing a portion of a periodic array by fewer, but scaled up elements that are excited only at lower frequency bands. We propose the implementation of the wavelength-scaled array using low-cost Planar Ultrawideband Modular Antenna (PUMA) radiators to further reduce cost, profile and improve polarization...
A 45° linearly polarized slot array antenna with balanced feeding network is proposed in this paper for automotive radar applications. The radiation element consists of one 45° inclined slot and two reflection cancellation vias. The balanced meandering feeding network proposed in this paper is able to achieve a relatively wide impedance bandwidth resulting from the traveling-wave propagation. In addition,...
This paper presents a simple yet very effective decoupling mechanism based on the insertion of two adjacent planar monopole rectangular patch antennas separated by λo/62. The array achieves a total realized gain of 3.48 dB (exciting one port) and 4.78 dB (exciting two ports), a relative bandwidth of 49 % ( 2 – 3.3 ) GHz over which the matching level |S21| is less than −10 dB and a coupling level |S...
This paper presents a mutual reduction technique based on the insertion of two strips between two adjacent planar monopole rectangular patch antennas with an edge to edge separation of λo/31. The array achieves a total realized gain of 3.73, 4.39 and 3.84 dB at 1.85, 2.4, and 3.5 GHz respectively, a relative bandwidth of 69% (1.8 – 3.7) GHz over which the matching level |S11| is less than −10 dB and...
This paper presents the design of gap-coupled series fed antenna array with improved bandwidth. The series-fed array is designed using ‘U’ shaped microstrip feed lines and parasitic elements gap-coupled to non-radiating edges of the central elements. The fabricated 3 element gap-coupled series-fed array has VSWR <2 bandwidth of 5.5%, achieving 3 times improvement in bandwidth as compared to conventional...
In early design stages of connected array radiators, passive evaluation using reflected illumination of test coupons without feed electronics provides a quick and inexpensive validation of design models. Inherent in the measurement setup are assumptions about array antenna behavior and acceptable approximations. Particular questions include the minimum number of unit cells necessary to adequately...
A sparse trifilar antenna can support two independent beams while, to reduce the interference between the beams, each array element supports only one beam. To minimize the grating lobe effects each beam is formed by three spiral arms resulting in a sparse random array arrangement. In this paper we investigate the impedance and radiation characteristics of such an array. We have shown that the active...
A 2 × 2 circularly polarized array antenna consisting of four electrically small parasitic antenna elements is proposed. Each antenna in the array uses top loading and a folded driver to decrease the overall size of the antenna array. The total volume of the array is 0.67λ × 0.67λ × 0.08λ. The array has a maximum gain of 11.5 dBi and a 3-dB beam width of 50° in both the xz and yz planes.
The effect of the finite grounded substrate size on the radiation characteristics of an H-plane linear microstrip array antenna on a high dielectric constant substrate is investigated. The radiation pattern characteristics of the array antenna versus scan angle are strongly influenced by the diffracted fields of surface waves from the substrate edge on the E-plane. The distance between the antenna...
A sparse trifilar antenna can support two independent beams while, to reduce the interference between the beams, each array element supports only one beam. To minimize the grating lobe effects each beam is formed by three spiral arms resulting in a sparse random array arrangement. In this paper we investigate the impedance and radiation characteristics of such an array. We have shown that the active...
A simple wideband and dual-polarized array is proposed. It is comprised of connected crossed hollow bowtie antennas. The element design can achieve an impedance bandwidth about 57% (from 1.5 to 2.7GHz). The 3dB gain bandwidth of the element is nearly 70% (from 1.35 to 2.75GHz). Dual polarization can be realized with a the good isolation (−25dB) between different polarization ports. A Γ - shape feed...
We present a Ka-band tightly coupled dipole array with micro electro-mechanical systems (MEMS) phase shifters directly integrated with the element feed structure. The dipole elements are printed on an alumina substrate with a twin coplanar waveguide (CPW) feed to ensure balanced feeding. An alternate feed structure in the form of Γ-matching circuit is also introduced to reduce the number of MEMS phase...
It is critically important that mutual coupling effects be properly taken into account when designing wideband antenna elements for use in phased arrays; especially those which require large scanning volumes. In this paper, a method of designing antenna elements for use in large planar phased arrays is presented. The geometric and electrical properties of a single antenna element in an infinite array...
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