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Evaluation of frequency reconfigurable patch antennas for multi-standard personal communication systems, using PIN diodes as switches. Two different configurations are studied with dual-band behavior: a patch antenna with two switchable slots; and a rectangular patch with a switchable parasitic element. One of the objectives is to evaluate the reliability of the simulation software to design and predict the performance of reconfigurable antennas with embedded active elements. These antennas were fabricated and the measured results show good agreement withthe simulations. Each of the designed antennas enable electronic switching of the operating frequency, while maintaining good input impedance match and stable radiation characteristics.
With the advancements in optical and satellite communications for high speed long range data transmissions, serrated antennas plays a vital role. In this work we have designed a Edge Serrated Microstrip Patch antenna used for these applications has been modeled on FR4 substrate as a dielectric medium which has a relative permittivity value of 4.4. The proposed antenna was resonating at two different frequencies in L & S band Microwave frequency ranges. This antenna was fed with coaxial feeding and was designed in a software HFSS.
In this paper a hexagonal patch microstrip antenna with hexagonal slot behaves as a wide band monopole antenna having great return loss. It is designed for 1.1194-2.7078 GHz frequency band with wide bandwidth of 1.5884 GHz and return loss of - 73.63dB. A hexagonal patch with etched ground plane monopole antenna with hexagonal Slot is fabricated on the glass epoxy (FR4 lossy) of dielectric substrate with relative permittivity (εr) of 4.3, thickness of 1.6mm, loss tangent of 0.02 with a ground plane, fed with a 50Ω rectangular microstrip feed line. This prototype antenna having an omnidirectional radiation pattern is measured for frequency range of 0-3 GHz. The novelty of this antenna is that hexagonal patch with hexagonal slot gives it uniqueness in design and also getting a bandwidth approx 1.6 GHz with -73dB Return loss is big achievement in 0-3 GHz frequency Band itself. As the antenna is designed only in 0- 3GHz band, having all such properties in one antenna p