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A shaped defected ground structure (DGS) that is asymmetric in a specific radiating plane of a microstrip element has been explored with a view to addressing the cross-polarization (XP) issues. The asymmetric configuration has been conceived from an insight of the inherent asymmetry of the modal fields underneath a probe-fed microstrip patch and has been experimentally demonstrated as the best possible...
Two single layer single feed small shorted microstrip antennas with air dielectric (εr = 1.001) substrate are presented. At first characteristics of a single probe fed square microstrip antenna incorporating a shorting post of radius 0.6mm at four different positions are studied. After connecting a shorting post about 81% reduction in resonant frequency is achieved. Another circular patch antenna...
Circular patch is one of the few basic geometries of microstrip patch antennas, and have been studied extensively in the literature [1, 2]. Typically, a substrate material is used between the patch and the ground plane to give the mechanical support to the antenna. The performance of microtrip antennas is strongly dependent on the properties of the substrate material used. Sine electromagnetic wave...
Microstrip antennas caught the attention of many designers in the last decade due to its numerous advantages; on the other hand narrow bandwidth is a major disadvantage of microstrip antenna in practical applications. There are still lots of research done to increase the bandwidth of these antennas. In this paper the effect of increasing the finite ground plane on a probe fed U-slot microstrip 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...
Microstrip Antennas (MSAs) consist of a metallic radiating patch on one side of thin dielectric substrate and other side is ground plane. Most important advantages of MSAs are low profile, light weight and compatibility with integrated circuit technology. MSAs are used in mobile communication, satellite communication, radar, direct broadcasting, global positioning systems and remote sensing. The major...
The major limitations of microstrip antennas (MSAs) are their narrow impedance bandwidth, small gain and low power handling capability. A half U-slot MSA with shorting wall has been designed and experimentally verified. Its center frequency is observed at 2.66 GHz. The bandwidth is 688 MHz and percentage bandwidth is 25.6% has been obtained while radiation efficiency is above 94% for the operating...
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