For training on microstrip compatible printed antennas, Vi Microsystems has developed the following antennas. All antennas are fitted with coaxial connectors. Resonant frequency is around 2.5 GHz and Polarization is linear.
a). The technical details of each antenna are as follows:[TOC]
Rectangular Patch Antenna (2.5 GHz)
* Input impedance at the feed point = 50 O
* Patch resonant frequency = 2.5 GHz (design)
* 3dB band width = 2.8 % (70 MHz approx.)
* Return loss at center frequency > 15 dB
* Directivity = 4.5 dB (approx)
* Beam width = 120º (approx.) (average of E an H plane BW) Printed Dipole Antenna (2.5 GHz)
* Input impedance at the feed point = 50 O
* Dipole resonant frequency = 2.5 GHz (design)
* 3dB band width = 14 % (350 MHz approx.)
* Return loss at center frequency > 15 dB
* Directivity = 2 dB (approx)
* Beam width = 90º (approx.) (average of E an H plane BW) Printed Slot Antenna (2.5 GHz)
* Input impedance at the feed point = 50 O
* Slot resonant frequency = 2.5 GHz (design)
* 3dB band width = 14 % (350 MHz approx.)
* Return loss at center frequency > 15 dB
* Directivity = 2 dB (approx)
* Beam width = 90º (approx.) In H plane, nearly omni-directional In E plane with dips in the substrate plane Printed 4 – Element Yagi Antenna (2.5 GHz)
* Input impedance at the feed point = 50 O
* Center frequency = 2.5 GHz
* 3 dB band width = 14% (350 MHz approx.)
* Return loss at center frequency > 15 dB
* Directivity = 10 dB (approx.)
* Beam width = 60º (approx.) in E and H planes Planar Antenna Related Experiments :
b). Using the Microwave Signal Source Network Analyzer. The following experiments can be performed on the planar antennas over the frequency range 2-3 GHz
*
Measurement of input return loss
* Measurement of radiation pattern
* Measurement of gain
Measurement of frequency/wavelength Measurement of Voltage Standing Wave Ratio (VSWR) Measurement of impedance of unknown load Display of VSWR pattern Measurement of return loss of any unknown load
Rectangular Patch Antenna (2.5 GHz)
