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Design of antennas mounted on complex platforms using the characteristic mode (CM) and characteristic basis (CB) function methods

Design of antennas mounted on complex platforms using the characteristic mode (CM) and characteristic basis (CB) function methods

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In this chapter, we will discuss two types of antenna design strategies, tailored for two different categories of antenna design problems. First of these will address the well-known problem of designing a multiband antenna, to be mounted on a mobile phone platform, to simultaneously cover the typical communication bands, for example, LTE, GSM, Bluetooth, WiMax, etc., with only a single antenna tailored for the platform, as is usually the requirement, except for MIMO applications. Next, we will turn to the problem of designing a plurality of antennas to be located on a complex platform to achieve certain radiation characteristics deemed desirable by the user, in order to receive the desired signals while suppressing the interfering ones. While several methods for radiation pattern synthesis of antennas exist in literature, They are only applicable to specific antenna geometries and they typically do not handle complex structures. The pattern synthesis problem is of great interest in many practical applications, for example, global positioning system (GPS) antenna design, and locating multiple antennas mounted on the rooftop of a large vehicle, or on the topside of a ship.

Chapter Contents:

  • 2.1 Introduction
  • 2.2 TCM approach to designing antennas for mobile phone platforms
  • 2.3 Characteristic basis method for locating antennas on mobile phone platforms
  • 2.4 Placement of multiple antennas on a complex platform
  • 2.4.1 TCM-based approach
  • 2.4.1.1 TCM approach to pattern realization from sources located on a complex platform
  • 2.4.2 CB-based approach
  • 2.4.2.1 Pattern control using CBs
  • 2.5 Illustrative examples
  • 2.5.1 Four microstrip patch antennas on an FR4 substrate
  • 2.5.2 Topside of a ship excited by monopoles
  • 2.5.3 Four PIFA antennas on FR4 substrate
  • 2.5.4 Chassis excited by six dipoles
  • 2.6 Conclusion
  • Acknowledgment
  • Appendix A1 Characteristic modes and bases
  • A1.1 Generation of characteristic modes (CMs)
  • A1.2 Generation of CBs
  • A1.2.1 Comparison between CMs and CBs
  • Appendix A2
  • A2.1 TCM analysis of mobile phone antenna and antenna-plus-platform
  • References

Inspec keywords: multifrequency antennas; mobile antennas; antenna radiation patterns; MIMO communication

Other keywords: single antenna; complex platforms; GPS antenna design; Bluetooth; global positioning system antenna design; MIMO applications; radiation pattern synthesis; mobile phone platform; characteristic basis function methods; multiband antenna; typical communication bands; complex platform; certain radiation characteristics; antenna design problems; GSM; WiMax; characteristic mode; antenna design strategies; LTE; multiple antennas; antennas mounted Design

Subjects: Antenna theory; Radio links and equipment; Single antennas

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