The future trend of Antenna
2008-07-29

                                                                                            The future trend of Antenna        Antennas are devices that used for both transmit and receive radio waves. As we will learn in this section, all antennas generally have three common characteristics: Antenna Reciprocity ¡¢Antenna Feed Point ¡¢Directivity.        In order to satisfy the system requirements and choose a suitable antenna, system engineers must evaluate an antenna's performance. Typical metrics used in evaluating an antenna includes the input impedance, polarization, radiation efficiency, directivity, and gain and radiation pattern. Input impedance     Input impedance is the parameter which relates the antenna to its transmission line. Polarization Polarization     The polarization of an antenna is defined as the polarization of the electromagnetic wave radiated by the antenna along a vector originating at the antenna and pointed along the primary direction of propagation. Directivity      It is convenient to express the directive properties of an antenna in terms of the distribution in space of the power radiated by the antenna. Gain     The gain, or power gain, is a measure of the ability to concentrate in a particular direction the net power accepted by the antenna from the connected transmitter. Radiation Efficiency      The radiation efficiency of an antenna is the ratio of the power radiated by the antenna to the net power accepted at its input terminals. Radiation Pattern      Antenna radiation patterns are graphical representations of the distribution of radiated energy as a function of direction about an antenna..         The world of wireless communications can appear to be a confusing offering of services, products and standards, all competing for dominance in a dynamic marketplace. But regardless of modulation, protocol, bandwidth or frequency, every wireless device requires an antenna for transmission and/or reception. The antenna is often taken for granted, but its performance is critical to the successful operation of any wireless system. Three major areas of activity in antenna research and development have emerged to meet the needs of modern communications systems: size reduction, wideband or multi-band operation, and adaptive pattern control.           As communication devices become smaller due to greater integration of electronics, the antenna becomes a significantly larger part of the overall package volume. This results in a demand for similar reductions in antenna size. However, reducing antenna size without significantly impacting gain and efficiency is a challenging task.           As integration increases, a single antenna is often required to support two or more of the many wireless services across a broad frequency range. Multi-band and wideband antennas are being developed to meet this need.          The third trend is the increased use of antenna arrays and development of new approaches for using arrays to improve system performance. These new compact, multilane; wideband and array antennas will serve in a wide variety of applications, but require innovative designs.        

          As to Chinese antenna industry, we have several competitive advantages in the antenna international market, such as Low Price¡¢Good Product Performance¡¢High Quality¡¢Good quality of Service and so on.           During recent years, there is latest International News about antenna. £¨1£©¡¢Antenna solution is ideal for GSM modules        EAD has enhanced its Nevis antenna range to include a standard configuration to compliment GSM modules with the GSC RF connector, such as Siemens and Sage GSM modules.        EAD has enhanced its Nevis antenna range to include a standard configuration to compliment GSM modules with the GSC RF connector, such as Siemens and Salem GSM modules The Nevis is an internal 900/1800/1900MHz antenna, with an Omni directional radiation pattern and offers 1dBi of peak gain        The Nevis is now available with a standard cable length of 200mm and GSC connector making it an ideal antenna solution for GSM module applications.        The part number for this Nevis version is FNER25001-MU-20 and is available to order with immediate effect. News Release from: Embedded Antenna Design | Subject: Nevis Edited by the Electronics talk Editorial Team on 09 June 2004 £¨2£©¡¢First plastic chip antenna developed with  laser-structural polyamide      Shanghai, China – April 22, 2008 - a company is Providing new laser-structural polyamide to EMW Antenna, South Korea’s leading antenna manufacturer, for developing the first plastic Chip antenna in the world for GPS and Bluetooth mobile phones.