By Zhi Ning Chen

ISBN-10: 0071612882

ISBN-13: 9780071612883

ISBN-10: 0071612890

ISBN-13: 9780071612890

Layout Antennas for contemporary instant Communications Systems
Written by way of an international workforce of professional participants, this e-book deals entire info at the wide variety of antennas utilized in latest instant communique networks. assurance comprises the preferred functions in WWAN (GSM, CDMA, and WCDMA), WLAN (Bluetooth and WiFi), WMAN (WiMAX), and WPAN (UWB and RFID).

Antennas for Base Stations in instant Communications provides an entire photo of recent base station antenna technology--from basics and parameters to engineering and complex solutions--and highlights new applied sciences in antenna layout with more advantageous functionality. Real-world case experiences give you functional examples that may be utilized for your personal process designs.

• practice dimension thoughts for numerous parameters
• allow frequency re-use and channel ability optimization in cellular radio networks
• layout antennas for cellular communications-CDMA, GSM, and WCDMA
• enforce complicated antenna applied sciences for GSM base stations
• Facilitate more desirable process skill
• layout unidirectional antennas, together with directed dipole, wideband patch, and complementary antennas
• Optimize antenna designs for WLAN (WiFi) applications
• layout antennas for instant own zone community (WPAN) functions, together with RFID and UWB

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Additional resources for Antennas for Base Stations in Wireless Communications

Example text

In order to achieve accurate results with the planar, cylindrical, or spherical near-field method, the transmitting or receiving properties of the probe must be known. With this information, the measured data can be corrected for the nonideal pattern and polarization properties of the probe. Probes are characterized by a three-step process: (1) The on-axis gain and polarization properties are measured using the technique described; (2) the far-field amplitude and phase patterns are measured for two nominally orthogonal polarizations of the incident field; and (3) the on-axis and pattern data are combined to obtain the probe correction coefficients at the desired lattice points for the measurement 5, 31 surface specified.

In order to achieve accurate results with the planar, cylindrical, or spherical near-field method, the transmitting or receiving properties of the probe must be known. With this information, the measured data can be corrected for the nonideal pattern and polarization properties of the probe. Probes are characterized by a three-step process: (1) The on-axis gain and polarization properties are measured using the technique described; (2) the far-field amplitude and phase patterns are measured for two nominally orthogonal polarizations of the incident field; and (3) the on-axis and pattern data are combined to obtain the probe correction coefficients at the desired lattice points for the measurement 5, 31 surface specified.

Beyond this the use of the same frequency will not be possible because of mutual interference. At a sufficient distance the signal level has fallen enough for another cell to re-use the same frequency. The elevation beamwidth of a base station antenna is typically only 5°–7°. By tilting the beam downward significant reduction of the re-use distance is possible. The angle by which the elevation pattern maximum is placed below the horizontal is known as the beamtilt of the antenna. Beamtilt can be provided by two mechanisms.

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Antennas for Base Stations in Wireless Communications by Zhi Ning Chen


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