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Two different designs have been studied for the application of EBG as a superstrate for 2 X 2 microstrip array antenna. It was shown that the cross-stacked EBG superstrate improves the input impedance bandwidth and reduces the overall size of the antenna in comparison to previous designs.
A loop antenna having a gap has been investigated in the presence of a ground plane. The antenna configuration is optimized for the CP radiation, using the method of moments. It is found that, as the loop height above the ground plane is reduced, the optimized gap width approaches zero. Further antenna height reduction is found to be possible for an antenna whose wire radius is increased. On the basis...
A new wideband antenna for airborne SAR applications has been presented. It is based on a geometry that gives a stable phase center. It allows to have a rejection of the ground response ambiguity of more than 34 dB. Its bandwidth (defined for a S11 les -8 dB, with a gain ges 5 dB) is 245-390 MHz (45%). Further works will include the improvement of the S11, along with a size reduction of the LPDA to...
A single-layer microstrip reflectarray antenna composed of double-circular rings elements of variable sizes is presented. Compared to single microstrip patches or rings of rectangular or circular shape, the double circular ring elements offer much a larger phase variation range and lower phase slopes and lead to broader operation of a reflectarray. Using these elements, a prime-focus reflectarray...
Design of a 35 GHz conformal microstrip patch antenna 4 x 4 elements array on a perfectly conducting cone is presented. A new kind of microstrip feed approach, which is hemline feed method (HFM), is used to design the patch element. And this kind of elements is used for forming the conformal microstrip array. The influence of the conical curvature on the radiation features of the conformal antenna...
A 53 dB gain limiting amplifier for OC-192 and 10 GbE applications is developed in a 50 GHz fT SiGe SOI complimentary bipolar process, and has 5 mV pk-pk sensitivity, 1.25 V pk-pk maximum input signal, 14 ps (20/80%) rise/fall times and 450 mV pk-pk output into matched differential 50 Ohm loads, consuming 430 mW on a 3.3 V supply. Input Cherry-Hooper gain stages limit the -3 dB bandwidth to 11 GHz...
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