Total Isotropic Sensitivity
Total Radiated Power
Voltage Standing Wave Ratio
Every wireless product requires at least one antenna. Much of the success or failure of a wireless product depends on the performance of the wireless link – including items such as the usable range, robust and repeatable connectivity, and connectivity speed. Wireless performance is completely dependent on a high- performance antenna design and implementation. The benefits of a high performance, and likely expensive, radio module can easily be lost with a poorly designed antenna, or even a well-designed antenna that has been improperly implemented. An improperly designed or poorly implemented antenna is often the cause of performance issues found during the PCS Type Certification Review Board (PTCRB) Certification process. More than any other component, integration of the antenna into the product is a critical part of the design process. Too often, the antenna is simply “added on” to a product design that has been essentially completed, resulting in serious implementation compromises. Each different type of antenna has its relative merits and disadvantages in performance, manufacturability, and cost. This paper discusses the various trade- offs involved in the antenna selection and design process for mobile devices. In general, all of the following discussion is focused on the 850 and 1900 MHz frequency bands. Where absolute dimensions are given, these dimensions are scaled for the 850/1900 MHz bands.
3. Antenna Fundamentals
Antenna Fundamentals – Technical Brief