Analysis and Design of a Differentially-Fed Frequency Agile Microstrip Patch Antenna
- 1 July 2010
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Antennas and Propagation
- Vol. 58 (10), 3122-3130
- https://doi.org/10.1109/tap.2010.2055805
Abstract
The design of a frequency agile microstrip patch antenna is described that is readily interfaced with differential RF transceivers. By integrating three pairs of varactor diodes with the patch antenna, and tuning them in unison, frequency tuning ratios approaching 2 are possible with the design. This is made possible by the intrinsically broadband nature of the differential feeding scheme used. An intuitive equivalent circuit for predicting the port characteristics of the antenna is presented. Moreover, the circuit is shown to be highly accurate in predicting losses produced by the varactor diodes and the consequent radiation efficiency of the antenna. To the best of the authors' knowledge, this is the first time a detailed analysis of the effect of varactor diode losses has been undertaken in frequency agile antennas using an equivalent circuit. The equivalent circuit model is subsequently validated using full-wave simulations and experimental measurements of an antenna operating in the 2-4 GHz range.Keywords
This publication has 33 references indexed in Scilit:
- A compact antenna with two independently tunable frequency bandsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2008
- A differentially-fed microstrip patch antenna with enhanced frequency agilityPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2008
- A Simple PIFA-Based Tunable Internal Antenna for Personal Communication HandsetsIEEE Antennas and Wireless Propagation Letters, 2008
- Compact dual-band tunable microstrip antenna for GSM/DCS-1800 applicationsIET Microwaves, Antennas & Propagation, 2008
- A PIFA-Type Varactor-Tunable Slim Antenna With a PIL Patch Feed for Multiband ApplicationsIEEE Antennas and Wireless Propagation Letters, 2007
- A modified Wheeler cap method for measuring antenna efficiencyPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- Tuning techniques for planar inverted-F antennaElectronics Letters, 2001
- A generalized model for coupled lines and its applications to two-layer planar circuitsIEEE Transactions on Microwave Theory and Techniques, 1992
- Analysis of a suspended patch antenna excited by an electromagnetically coupled inverted microstrip feedIEEE Transactions on Antennas and Propagation, 1985
- Asymmetric Coupled Transmission Lines in an Inhomogeneous MediumIEEE Transactions on Microwave Theory and Techniques, 1975