8Multiband Antennas for LTE Femtocells
Masood Ur Rehman1 and Xiaodong Yang2
1 School of Computer Science and Technology, University of Bedfordshire, Luton, UK
2 School of Electronic Engineering, Xidian University, Xi’an, China
Provision of multiple services operating at different frequencies while keeping the overall size of the wireless devices within certain limitations (that are often driven by commercial aspects and user acceptability factors) is an apparent challenge in femtocell antenna design. Embedding multiple antennas makes these restrictions harder to fulfil. A single antenna supporting multiband operation is, therefore, a good alternative. This chapter explores various requirements for such antennas along with design challenges. Two antennas are studied as test cases to understand their working and benefits.
8.1 Fundamentals of Multiband Antennas
Rapid growth of wireless communications has increased the demand for mobile terminals and femtocell devices offering multiple features.
Emergence of new technologies necessitates them to integrate multiple services; for example, coverage of different cellular frequencies, availability of navigation and positioning and inclusion of Wi‐Fi. It requires the device to operate at various LTE frequencies along with Wi‐Fi, Bluetooth, GPS and so on as discussed in Chapter 7, but while offering a small form factor [1]. They are required to have small and compact size, low cost and be light weight in order to guarantee the ease ...
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