Antennas for Base Stations in Wireless Communications by Zhi Ning Chen

By Zhi Ning Chen

Layout Antennas for contemporary instant Communications Systems
Written through a world group of specialist individuals, this booklet bargains whole information at the wide selection of antennas utilized in latest instant conversation networks. assurance comprises the most well-liked 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 offers an entire photograph of contemporary base station antenna technology--from basics and parameters to engineering and complicated solutions--and highlights new applied sciences in antenna layout with superior functionality. Real-world case experiences give you sensible examples that may be utilized for your personal process designs.

• observe size thoughts for varied parameters
• let frequency re-use and channel potential optimization in cellular radio networks
• layout antennas for cellular communications-CDMA, GSM, and WCDMA
• enforce complex antenna applied sciences for GSM base stations
• Facilitate more advantageous approach 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) purposes, together with RFID and UWB

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Extra resources for Antennas for Base Stations in Wireless Communications

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1 Re-use distance. The propagation loss is typically proportional to about d . The limiting radius of the cell represents the distance at which there is a reasonable chance the SINR ratio will be sufficient to provide an adequate BER. 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°.

The apparent gap between 65° sectors is filled from an adjacent BS. In dense urban areas the planning of most networks is determined by the need to provide sufficient capacity rather than to cover the largest possible area, so different considerations may apply to the design of BS antennas. For azimuth angles beyond the edges of the served cell, allowing some overlap for handoff control and optimization, the signal radiated by a BS antenna has no functional use and serves only to impair the C/I ratio in other cells.

In an antenna radiation pattern, a null is a zone in which the effective radiated power is at a minimum. A null often has a narrow directivity angle compared to that of the main beam. Thus, the null is useful for several purposes, such as suppressing interfering signals in a given direction. Comparing the front-to-back ratio of directional antennas is often useful. This is the ratio of the maximum directivity of an antenna to its directivity in the opposite direction. For example, when the radiation pattern is plotted on a relative dB scale, the front-to-back ratio is the difference in dB between the level of the maximum radiation in the forward direction and the level of radiation at 180°.

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