Radio frequency

RCA, the Radio Corporation of America, was formed in October 1919 by major radio interests, General Electric, Westinghouse, the United Fruit Company (UFC), and AT&T, to pool patents and research, and to coordinate radio development. Its formation received congressional support due to its ability to keep radio control in US hands in the face of foreign competitors like Marconi and after Congress denied the Navy of control of radio in the 1918 Congressional Radio Hearings which also excluded…

give off waves? What does radiation have to do with a cellular device? Here I’ll tell you. According to Environment, Health, and safety online, “A cell phone or cellular device operates with radio frequencies. Which is a form of electromagnetic energy that’s located on the electromagnetic spectrum between FM radio waves and waves used in microwaves, ovens, radar, and satellite stations.…

wireless local area network (WLAN), cellular phone, medical applications. and satellite communication. As shown in Fig. 1, The Microstrip Patch Antenna consists of a metallic patch above a ground plane. The shape and size of patch determine the frequency of operation of the antenna and its…

later evolved. From Thomas Edison inventing the light bulb to Johann Gutenberg inventing the printing press. However, the invention of radio has caused the most impact for society as it provided society with easier communication and later on entertainment alongside with access to information. Guliemlo Maroni the Italian man who is credited as the inventor of radio. Marconi read a biography from Heinrich Hertz, a German physicist who proved the theory of electromagnetic waves to which Marconi…

But due to the radio the situation completely changed. The Radio connected rural America to urban America in this culture…

Cyber-Security in Transportation Technology in transportation can result in productivity gains, however a higher dependency on information technology also leads to greater exposure and potential of being a target for cyber-crimes such as denial of service, stealing of passenger private information and cyber terrorisms. According to analysis for incidents from 2002-2004 transportation systems faced 16% of total cyber hackings and terrorisms on critical infrastructure (IEEE, 2007).…

difficult to pinpoint any time where you were not serenaded by the radio while you were out running errands. All of this is thanks to the invention of broadcast radio. Broadcast radio was by far one of the most important and revolutionary inventions, paving the way for countless other endeavors. It all started with a man named Heinrich Hertz. Hertz was a German physicist who, in the late 1880s, was credited with proving the existence of radio waves on the electromagnetic spectrum. This is where…

similarity to WI-FI which utilizes radio waves for transfer of data. WI-FI is great for extensive wireless coverage in buildings but has severe limitations for high density wireless information coverage in limited space and has radio waves interference issues; While Li-Fi greatly overcomes such restrictions. These two technologies can be well thought-out as harmonizing to each other in numerous ways and Li-Fi has advantages over usual Wi-Fi.…

interactions between people. Before the radio mass culture was essentially non-existent, the culture was defined to local communities through the daily interactions of people ("Mass Culture - Oxford Reference"). When radio was popularized it became the common source of media that brought communities of the United States of America together by providing it with a common culture. This paper will focus on the birth of radio in the 1920s, elucidating how advances in radio brought about a newer…

Code-division multiple access (CDMA) Discussion of CDMA Code-division multiple access (CDMA) is a multiple access method used by different types of radio communication technologies. Direct-sequence spread spectrum signals uses CDMA which allow more than one user to share a channel. CDMA is a form of multiplexing which allows many signals to occupy a transmission channel and optimizing the use of available bandwidth. Therefore, the receiver separates the signals from the users by cross…