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A four-beam microstrip antenna designated for two-dimensional beam scanning which utilizes a single layer of laminate has been proposed. A beam-forming network of the proposed antenna is composed of four appropriately connected 3-dB/90° directional couplers. With the use of the proposed network it is feasible to integrate it in a single metallization layer with radiating elements, reducing both size...
A suspended stripline technique has been employed for realization of a 3-dB impedance transforming directional coupler. In order to assure sufficient shielding of one of the coupled conductors from the ground, a pair of standard 50 Ohm coaxial transmission line sections has been used. The presented concept has been verified by measurements of the designed impedance transforming directional coupler...
A five-element microstrip antenna array has been proposed, in which a beamwidth has been broaden in both principal cut-planes by the utilization of additional elements coupled to a center, probe-fed patch. The proposed concept has been verified with two antenna models operating within 10 GHz frequency range.
A technique for polarization purity improvement designated for linear series-fed microstrip antenna arrays is shown. The proposed method is realized with the use of additional radiating elements introduced at an opposite side of a feeding line and does not increase complexity of a feeding network. Moreover, the polarization purity improvement method allows for both suppressing the orthogonal polarization...
The paper presents the design of a broadband microstrip antenna array operating within 24 GHz frequency range. The designed antenna array is destined for application in FMCW radar modules, in which 2 GHz frequency deviation has been assumed. The antenna has been designed as a 4 × 4 array to achieve appropriate gain. To achieve broadside beam within broad frequency range a parallel feeding network...
A novel concept of a series feeding network of a microstrip antenna array has been shown. The proposed feeding network utilizes a four-port slot coupler as a three-way power divider, which is composed of two microstrip lines appropriately coupled through a slot within a common ground plane. The proposed power divider is used for simultaneous power distribution between two consecutive linear subarrays...
A two-octave 4×4 Butler matrix has been presented, for the first time in multilayer microstrip asymmetric coupledline technology. To achieve two-octave frequency band in terms of amplitude and phase responses a recently developed approach has been used in which multi-section coupled-line directional couplers and Schiffman C-sections are applied. A highperformance three-section coupled-line 3-dB microstrip...
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