Mehedi Hassan

Quick recap from Madrid’s visit to Naples.

In this article, a compact multiband antenna design and analysis is presented with a view of ensuring efficient uplink/downlink communications at the same time from a single antenna for CubeSat applications. This design shares the aperture of an S-band slot antenna to accommodate a square patch antenna operating in the X-band. Shared aperture antennas, along with an air gap and dielectric loading, provided good gain in both frequency bands. The S-band patch had an S11 = −10 dB bandwidth of 30 MHz (2013–2043 MHz, 1.5%), and the X-band antenna demonstrated a bandwidth of 210 MHz (8320–8530 MHz, 2.5%). The Axial Ratio (<3 dB) bandwidth of the slot antenna in the S-band is 7 MHz (2013–2020 MHz, 0.35%), and it is 67 MHz (8433–8500 MHz, 0.8%) in the case of patch antenna in the X-band. While the maximum gain in the S-band reached 7.7 dBic, in the X-band, the peak gain was 12.8 dBic. This performance comparison study shows that the antenna is advantageous in terms of high gain, maintains circular polarization over a wideband, and can replace two antennas needed in CubeSats for uplink/downlink, which essentially saves space.

Bangabandhu’s visionary Territorial Waters and Maritime Zones Act, 1974

Since Bangabandhu’s Territorial Waters and Maritime Zones Act, 1974, Bangladesh has made significant strides in the development and management of its maritime resources

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Between Shia Mosque and Mohammadpur Bus Stand, a mausoleum stands at Banshbari, easily visible on the left. On the other side of the road is the historic Sat Gambuj Mosque and today, surrounded by numerous modern buildings, the sepulchre stands out because of its unique design and structure.

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Readers help support MSpoweruser. We may get a commission if you buy through our links. Read our disclosure page to find out how can you help MSPoweruser sustain the editorial team Read more

Readers help support MSpoweruser. We may get a commission if you buy through our links. Read our disclosure page to find out how can you help MSPoweruser sustain the editorial team Read more