Frequency-Reconfigurable Microstrip Patch Antennas With Circular Polarization

A simple design of circularly-polarized (CP) microstrip antennas with frequency agility is described. The reconfigurable antenna is composed of a square radiating patch, four varactor diodes, and two lumped capacitors. With a coaxial probe, two orthogonal resonant modes of the square patch antenna a...

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Bibliographic Details
Published in:IEEE antennas and wireless propagation letters 2014, Vol.13, p.1112-1115
Main Authors: Row, Jeen-Sheen, Tsai, Jia-Fu
Format: Article
Language:English
Subjects:
Antennas
Capacitors
Circular polarization
Design engineering
Electric potential
Equivalence
Frequencies
Frequency measurement
Microstrip
microstrip antenna
Microstrip antennas
Patch antennas
reconfigurable antenna
Resonant frequencies
Resonant frequency
Voltage
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Description
Summary:A simple design of circularly-polarized (CP) microstrip antennas with frequency agility is described. The reconfigurable antenna is composed of a square radiating patch, four varactor diodes, and two lumped capacitors. With a coaxial probe, two orthogonal resonant modes of the square patch antenna are simultaneously excited. When the equivalent capacitance values of the varactors are increased, the resonant frequencies of the two modes are decreased, and at the same time the lumped capacitors with a specific value are introduced to produce a difference between the two resonant frequencies so that a CP operating frequency can be generated and tuned. For the proposed design, only one dc voltage is required to vary the CP operating frequency, and experimental results indicate that the CP frequency can be switched between 1.97 GHz and 2.53 GHz; in addition, good CP performances can be obtained at each CP operating frequency.
ISSN:1536-1225
1548-5757
DOI:10.1109/LAWP.2014.2330293