Application and modeling of GaN FET in 1MHz large signal bandwidth power supply for radio frequency power amplifier

In this paper, implementation and testing of non- commercial GaN HEMT in a simple buck converter for envelope amplifier in ET and EER transmission techn iques has been done. Comparing to the prototypes with commercially available EPC1014 and 1015 GaN HEMTs, experimentally demonstrated power supply provided better thermal management and increased the switching frequency up to 25MHz. 64QAM signal with 1MHz of large signal bandw idth and 10.5dB of Peak to Average Power Ratio was gener ated, using the switching frequency of 20MHz. The obtaine defficiency was 38% including the driving circuit an d the total losses breakdown showed that switching power losses in the HEMT are the dominant ones. In addition to this, some basic physical modeling has been done, in order to provide an insight on the correlation between the electrical characteristics of the GaN HEMT and physical design parameters. This is the first step in the optimization of the HEMT design for this particular application.

A Computational Method based on Radio Frequency Technologies for the Analysis of Accessibility of Disabled People in Sustainable Cities

The sustainability strategy in urban spaces arises from reflecting on how to achieve a more habitable city and is materialized in a series of sustainable transformations aimed at humanizing different environments so that they can be used and enjoyed by everyone without exception and regardless of their ability. Modern communication technologies allow new opportunities to analyze efficiency in the use of urban spaces from several points of view: adequacy of facilities, usability, and social integration capabilities. The research presented in this paper proposes a method to perform an analysis of movement accessibility in sustainable cities based on radio frequency technologies and the ubiquitous computing possibilities of the new Internet of Things paradigm. The proposal can be deployed in both indoor and outdoor environments to check specific locations of a city. Finally, a case study in a controlled context has been simulated to validate the proposal as a pre-deployment step in urban environments.

Symposium on Biological Effects and Measurement of Radio Frequency/Microwaves : proceedings of a conference held in Rockville, Maryland, February 16-18, 1977/

Includes bibliographical references.

Radio frequency interference : hearing before the Subcommittee on Communications of the Committee on Commerce, Science, and Transportation, United States Senate, Ninety-fifth Congress, second session on S. 864 ... June 14, 1978

"Serial no. 95-117."

A standard for RF modulation factor /

Report No. FAA-RD-79-94." Microfiche.

A temperature probe for radio-frequency heated material /

"January 1981."

Frequency-modulation oscillator cavity system for synchrotron acceleration in the Illinois 300 MeV betatron,

Mode of access: Internet.

Organizational, direct support, and general support maintenance repair parts and special tools lists for test set, radio frequency power AN/USM-260 (NSN 6625-00-917-3099).

"September 1976."

Operator's and organizational maintenance manual including repair parts and special tools lists : simulator, radio frequency SM-442A/GRC.

"August 1967."

Organizational, direct support, and general support maintenance repair parts and special tools lists (including depot maintenance repair parts and special tools) for test set, radio frequency, power AN/URM-120 (NSN 6625-00-790-2746).

"August 1978."

Operator, organizational, DS, GS, and depot maintenance manual (including repair parts and special tool lists) : radio frequency power test set TS-2609/U.

"May 1968."

Direct support and general support maintenance repair parts and special tools list for radio frequency plug-in, Weinschel Engineering Company model 432AP-2 (NSN 4931-01-060-0525).

Includes index.

Direct support and general support maintenance manual : receiver radio frequency noise measurement equipment including test set, radio frequency noise TS-3376/G (NSN 6625-00-237-2406), monitor, noise temperature ID-1915/G (NSN 5895-00-241-9367) for satellite communication terminal AN/FSC-78(V).

"June 1978."

Organizational and direct support maintenance repair parts and special tools list for monitor, radio frequency R-2176/FRN (NSN 6625-01-098-2534).

Includes index.

Operator's manual : monitor, radio frequency R-2176/FRN (NSN 6625-01-098-2534).

"23 July 1981."