Download Antennas for Base Stations in Wireless Communications by Zhi Ning Chen PDF

By Zhi Ning Chen

Layout Antennas for contemporary instant Communications Systems
Written by way of a world staff of specialist members, this e-book bargains entire information at the wide selection of antennas utilized in trendy instant communique networks. insurance comprises the preferred purposes 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 a whole 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 superior functionality. Real-world case reviews offer you functional examples that may be utilized for your personal process designs.

• practice dimension concepts 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 suitable method ability
• layout unidirectional antennas, together with directed dipole, wideband patch, and complementary antennas
• Optimize antenna designs for WLAN (WiFi) applications
• layout antennas for instant own quarter community (WPAN) purposes, together with RFID and UWB

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Extra resources for Antennas for Base Stations in Wireless Communications

Sample text

As the impedance bandwidth increases, however, surface wave losses also increase, which reduces radiation efficiency. To suppress the surface waves a low permittivity of the substrate is required. 3 Planer Inverted-L/F Antennas A planar inverted-L/F antenna is an improved version of the monopole antenna. The straight wire monopole is the antenna with the most basic form. Its dominant resonance appears at around one-quarter of the operating wavelength. 10. A PIFA can be considered a kind of linear inverted-F antenna (IFA), with the wire radiator element replaced by a plate to expand bandwidth.

Base stations typically support three cells spaced 120° apart in azimuth, although this plan is by no means universal especially where coverage may be limited by buildings or hills or where usage patterns are nonuniform, as in the case of a BS alongside a major highway. Code division multiple access (CDMA) systems require careful control of the overlap between cells to avoid excessive loss of capacity in soft/softer handoff modes, so a 3-dB beamwidth of 65° is the norm. Global System for Mobile Communication (GSM) systems typically use antennas with 65° beamwidth in urban areas but often use wider beamwidths in rural areas.

Intermodulation is widely discussed for the design of power amplifiers. Similarly, for a base station transmitting antenna, which emits high power, the intermodulation exists due to the metal/metal joint and material nonlinearity. The intermodulation is a kind of interference that should be suppressed. Suppose two closely located fundamental frequencies, f1 and f2, are transmitted by the antenna; due to nonlinearity, the radiated field has components at the frequencies of f1, f2, 2f1, 2f2, 3f1, 3f2, f1 + f2, f1 − f2, 2f1 − f2, 2f2 − f1, and so on.

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