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 5: Dual Band Microstrip Antennas
5.0 Dual Band Microstrip Antennas
Dual band microstrip antennas are generally of two types 1) Separate microstrip resonators coupled to a transmission line. 2) Perturbed microstrip resonators where their original resonant frequencies are shifted by geometrical alteration of a basic resonator. [1] [2] Dual band microstrip antenna designs which allow for independent frequency selection have the most design utility. A good overview of dual-band microstrip antennas is given by Maci and Gentili. [3]
[1]Kumar, Girish, and Ray, K.P., Broadband Microstrip Antennas, Artech House, 2003
[2]Wong, Kin-Lu, Compact and Broadband Microstrip Antennas, John Wiley & Sons, 2002
[3]Maci, S., and Gentili Biffi, G. "Dual-Frequency Patch Antennas," IEEE Antennas and Propagation Magazine, Vol. 39, No. 6, December 1997 pg 13 20
5.1 Single Resonator Rectangular Microstrip Dual Band Antenna
If one wants a dual-band microstrip antenna which has a broadside radiation pattern at each of the dual band design frequencies with the same polarization, one must drive the TM 10 and TM 30 modes. When these restrictions are chosen, the upper frequency must be approximately 3 times the lower frequency of operation. For a rectangular microstrip antenna, the pattern and polarization restrictions which have been imposed, severely limit the number of applications to which this design can be utilized.
In section (2.6.1) a rectangular microstrip antenna was used to create circular polarization by allowing the TM 10 and TM 01 modes to overlap in frequency. A similar approach may be used to...
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