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The effects of thickness and dielectric constant of flexible substrates on the performance of a circular planar monopole antenna (PMA) is reported in this paper. The antenna is printed on a flexible Polyimide substrate and fed by 50 Ω microstrip line. Results revealed that substantial effect on the antenna performance due to substrate thickness and material even if the radiating structure is ungrounded...
The design of a micro-strip patch antenna is proposed by optimizing its resonant frequency, Bandwidth of operation and Radiation resistance using Genetic Algorithm (GA). GA is based on the mechanics of natural genetics and natural selection and good at taking larger, potentially huge, search spaces and navigating them looking for optimal combinations of solutions which we might not find in life time...
A detailed comparison of the use of signal elevated and all-elevated CPW to obtain high performance resonators (matching networks) in the frequency range 140-320 GHz is given for the first time. We investigate the effect of elevation height and number and size of the posts which are used to elevate the CPW traces above the substrate. The number and size of the supporting posts is found to have a significant...
A novel compact coupled planar resonator (CCPR) based VCO (voltage controlled oscillator) using mode-coupling technique was developed in response to expensive high Ceramic and SAW resonators based signal source for wireless communications. One of the problems related to the conventional Ceramic/SAW based resonators (with high Q and low phase noise) is the challenge for integration in IC form. Instead...
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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