GHz For Satellite Communication Research Articles

Multiband Slotted Crescent-shaped Patch Antenna for K-band Satellite and mmWave Communications

In this paper, a multiband miniaturized crescent-shaped patch antenna with circular slots is presented for ultra-wideband applications. The proposed antenna is constructed on a Flame Retardant 4 (FR-4) dielectric substrate. Next-generation wireless communication systems, such as beyond 5G (B5G) and 6G mobile communication systems require a wider bandwidth and higher data rates. The overall size of the proposed antenna is 11×9×2.4 ㎣ operating in the frequency range of 17.73 GHz to 26.04 GHz and 29.6 GHz to 31.02 GHz for satellite communications and radar systems, respectively, as well as 35.40 GHz to 38.65 GHz for future mmWave B5G mobile applications. These frequency ranges usually fall into the K-band and mmWave frequency spectrums. Simulation results demonstrate that the peak gain of the proposed antenna is 4.68 dB, which is obtained at 25 GHz.

Future Earth Stations in 14–12 GHz for Domestic Satellite Communications

More and more countries of the world are making plans to change over to higher frequency band of 14–12 GHZ for satellite communications. This band is quite attractive for domestic satellite communications including TV broadcsast as satellites with narrower beams and higher EIRPs have become realities. In this paper, present trends in technology at this frequency are reviewed in relation to future earth stations to be set up in large numbers. A case study is presented with link power budgets for major earth stations and small remote area terminals to work with TV, thick and thin route telecommunications and radio networking in a domestic network. Small terminal sizes have been optimized to make them low cost, while achieving the required quality of communications between them and major earth stations. Study shows that satellite communication at these higher frequencies will be initially power limited rather than bandwidth limited.

First Result from 15.3-GHz Earth-Space Propagation Study

Consideration is being given to the use of frequencies well above 10 GHz for satellite communication. One of the problems encountered in the use of these high frequencies is the attenuation caused by precipitation. A considerable amount of pertinent data has been obtained in the 16- and 30-GHz sun tracker and 16-GHz radiometer programs underway at the Crawford Hill Laboratory.1,2 From the data obtained from radiometer measurements, one may calculate the attenuation expected on an earth-space path. Such attenuation calculations have been shown to be in good agreement with sun tracker measurements.1 The present experiment was designed to check further the validity of the radiometer results by a direct comparison of the data obtained from a 16-GHz radiometer with the attenuation measured by transmission from a the afternoon of April 24, 1970. The peak measured 15.3-GHz signal attenuation and the corresponding 16-GHz radiometer record were 9.8 dB and 10.6 dB respectively.)