[PDF] Top 20 Experiment on an aperture-coupled leaky-wave antenna with a pencil beam

... ABSTRACT: A frequency-scanning leaky-wa ¨ e antenna with an aper- ture-coupled feeding structure is ...The aperture-fed structure is used to excite the microstrip first ... See full document

... Experimental and theoretical results: This antenna was studied both experimentally and theoretically and results are mainly pre- sented for a 3-turn hemispherical helix[r] ... See full document

... ABSTRACT: An X-band four-element linear microstrip leaky-wa ¨ e ( ) antenna LWA array with a dual-beam radiation pattern and two- dimensional scanning capability is de ¨ ...the ... See full document

... describes an -band 4 1 aper- ture-coupled series-fed electronically steerable microstrip leaky-wave antenna (LWA) array design, which has dual-beam radiation pattern and ... See full document

... However, the bandwidth is narrow and the leaky wave phenomenon is not clearly observed because the feed excites both the dominant mode and the first higher order mode[r] ... See full document

... Introduction: It has recently been shown that dual-frequency oper- ation can be obtained in a rectangular microstrip antenna with a pair of properly-bent narrow slots pl[r] ... See full document

... by a qualitative argument according to a quasi-TEM approxima- tion in this case, one of the two coupled lines is an open end, Ž and the other one is loaded by a short circuit according ... See full document

... proposed a new phase-shifterless 1-D beam-scanning technique using patch antenna array with coupled ...main beam can be scanned in ...demonstrate a linear phased ... See full document

... microstrip leaky-wave array excited by the aperture-coupling ...order leaky mode is employed as the radiation ...components with the ground planes provides op- timal design of radiators ... See full document

... In coupled oscillator arrays, mutual coherence is achieved by the bilat- eral injection locking of each oscillator to its nearest neigh- ...of a two-element coupled active antenna array has ... See full document

... plane with etched slot ...main beam, the back lobe, and the slot lobe resulted from the injection power, the reflected power at the antenna end, and the power leaked from the ...slots on the ... See full document

... ⬚ with a maximum directivity of 8.5 dBi. Note that the . main beam positions of the out-of-phase mode are at ␪ s ...shows a comparison between the measured and theoretical prediction of the ... See full document

... A novel two-dimensional electronic beam scanning technique using a linear leaky-wave antenna array with coupled oscillators is introduced, eliminating the need for phase shifte[r] ... See full document

... Unfortunately, no method has yet bccn proposcd which cin ena- hle the beam mode, such as thc onc-bcnm scanning or dual-beam scanning inodc, to bc cliangcd.. In this L[r] ... See full document

... AVE A NTENNA The design of an -band active two-beam scanning leaky- wave antenna is presented as ...of an HEMT VCO, a matching circuit and a microstrip ... See full document

... broadside coupling iroquency conlrol frequency control 2.3 Azimuth scan. A sc;intiing-array di:igr:im is showti in Fig[r] ... See full document

... ICROSTRIP leaky-wave antennas [1]–[4] have the advantages of narrow beamwidth, small size, easy fabrication, easy matching, frequency scanning, and can be easily integrated with other useful circuits ... See full document

... Furthermore, reflected wave due to the open end of each leaky-wave antenna element has been suppressed by the symmetric configuration of this antenna array and the antenna efficiency inc[r] ... See full document

... built, and tested. Rigorous field-theory analyses of the new quasi-planar leaky-wave radiating element is presented. This results in useful design data that further exp[r] ... See full document

... fast wave re- gion, which are qualitatively matched with the dispersion char- acteristic analysis shown in ...in an anechoic chamber using an HP8530A vector network ...main beam ... See full document