Microstrip and Printed Antenna Design
Written for practicing engineers new to the field, this book includes a succinct treatment of wireless designs with enough detail that CAD formulas may be implemented with relative ease.
TABLE OF CONTENTS Microstrip and Printed Antenna Design
Chapter 7: Printed Antennas
7.0 Printed Antennas
Microstrip antennas have a large number of applications despite their limitations. In some cases pattern or bandwidth requirements can only be met with planar antennas which are not a traditional microstrip configuration. We will generally refer to these as printed or planar antennas. In some cases microstrip transmission line may be integrated with an antenna and so it is often still called a microstrip antenna. In this chapter we will investigate a number of useful printed/microstrip antenna designs.
7.1 Omnidirectional Microstrip Antenna
In a number of wireless applications, an antenna with an omnidirectional pattern is desired. [1] An omnidirectional antenna which is easily scaled to produce a range of gain values, does not require a balun when fed with a coaxial transmission line, and has a 50 ? driving point impedance was introduced by Bancroft and Bateman. [2] [3] The geometry of the Omnidirectional Microstrip Antenna (OMA) is presented in Figure 7-1. The antenna consists of a bottom trace which begins with width W 2 which is L long. The trace narrows to W 1 and length L and alternates between wide and narrow until the final wide section. Both wide end sections are shorted in their center to the upper trace. The upper trace begins at the bottom short with a narrow trace which is of width W 1 which alternates wide and narrow complementing the upper trace. The final upper trace terminates at the upper short. The...
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