A COMPACT LOWPASS/DUAL-BAND BANDPASS FILTER FOR MICROWAVE APPLICATION

A combination of lowpass and dual band bandpass filter with improved selectivity is presented in this manuscript. Two circular split ring resonators which are connected at the upper side, provide a lowpass filter characteristics. In order to achieve combined lowpass with dual passband response two L-shape stubs are incorporated into the lowpass filter structure. The parametric analysis of the proposed filter has been carried out using CST microwave studio. The numerical result shows a 3-dB cutoff frequency for lowpass at 1.22 GHz, first and second passband resonant frequencies are 2.44 GHz and 3.7 GHz respectively. The proposed filter is compact and overall size of the proposed filter is 32.9 mm×15mm

DUAL BAND MIMO ANTENNA FOR LTE, 4G AND SUB–6 GHZ 5G APPLICATIONS

In this manuscript, a compact MIMO antenna for wireless application has been presented. The proposed antenna consists of the F-shaped radiator with the circular slot in the center and a rectangular ground plane on the other side of the substrate. The proposed antenna has the overall size of 48 × 48 mm2. The antenna is designed to work on two frequency bands - from 1.5 to 2.3 GHz, and 3.7 to 4.2 GHz, having the resonating frequency of 1.8 GHz and 3.9 GHz respectively. The diversity performance of the antenna is also observed by using a variety of parameters like envelop correlation coefficient (ECC), Diversity Gain (DG), Total Active Reflection Coefficient (TARC), etc. The value of ECC is 0.02, which shows good diversity performance of the antenna. In order to validate the simulated and measured results, the proposed antenna has been fabricated and shows good agreement with the each other

DESIGN AND ANALYSIS OF QUADRIFILAR HELICAL ANTENNA FOR CUBE-SATS USING C-BAND FREQUENCY RANGE FOR SATELLITE COMMUNICATION

Design and analysis of quadrifilar helical antenna is presented in this paper. The proposed antenna is designed for cube-sats in the low earth and medium earth orbit applications. It is a combination of 4 helical antennas, each separated by 90o, with left-handedness and it is designed for operation at 4.5GHz. The proposed antenna has 11.11% impedance bandwidth. The antenna is designed in 2 steps to analyze its proper radiation pattern and input characteristics. The first step of designing is selection of a ground plane with perfect dimensions, which can operate at desired frequency. While the second step is to analyses the antenna performance for different helix angle using proper ground plane dimensions. The gain versus frequency curve has been obtained for desired frequency and it is showing more than 5 dB gain at resonant frequency 4.5 GHz. Thus, based on desired application proposed antenna has been designed