Матеріали про Antennas

People who work with LTE Physical layer and maybe higher layers would be aware of this term called 'Antenna Ports'. I have always wondered how these antenna ports are mapped to physical antennas. The following is from R&S whitepaper: The 3GPP TS 36.211 LTE standard defines antenna ports for the downlink.

Last year I blogged about 'Antennagate'. From what I hear, iPhone 4S has left this problem far behind and have a much better RF performance than other rivals. The Australian operator Telstra operates a scheme where it gives a 'blue tick' to all mobiles that have superior RF performance than other average mobiles. The following is an interesting comment from their Crowdsupport site: Telstra offers three classes of coverage, A B and C.

Interesting technical whitepaper from R&S: LTE Transmission Modes and Beamforming View more documents from Zahid Ghadialy Available to download from here or here. Источник: http://feedproxy.google.com/~r/3gAnd4gWirelessBlog/~3/bSXBHgh96ec/r-whitepaper-lte-transmission-modes-and.html.

The biggest problem with Antennas for mobiles and now the tablets have been how to arrange antennas for MIMO since the wavelength needs to be λ/4. The picture gives an idea how the antenna size changes with different frequencies.

Источник: http://feedproxy.google.com/~r/3gAnd4gWirelessBlog/~3/lkHRw46B0Ao/at-comparing-in-building-solutions.html.

From the 4th LTE North America Conference, 8 - 9 November 2011, Dallas, Texas, USA More about DAS on Wikipedia here. Источник: http://feedproxy.google.com/~r/3gAnd4gWirelessBlog/~3/y24v8nyhqZw/at-on-distributed-antenna-system-das.html.