Abstract
A simple rectangular microstrip antenna on low dielectric constant substrate such as air for improved radiation beam performance is theoretically investigated. The conventional patch antenna fabricated on common substrates always produces quite broader E plane pattern compared to its H plane. In the present investigation, the same microstrip antenna is designed on air substrate with a view to develop an efficient feed for parabolic reflector antenna, which shows an excellent radiation pattern with symmetrical 3 dB beam widths at its both E and H plane. The present antenna compared to conventional structure to show its excellence in the beam performance is presented. The complete quantitative analysis to explore such radiation beam characteristics for both the structures (conventional and the present one) is also presented in this paper. An easy and handful relationship between the length of patch antenna and its fringing length for different types of substrate is established in the background of 3 dB beam widths. The proposed idea has been verified through a commercial software package for a patch operating in X band and a concrete physical insight into the phenomenon is developed.
Highlights
The conventional rectangular microstrip antenna is the most common geometry amongst the printed antennas etched on conventional poly tetra fluoride ethylene substrate with dielectric constant εr = 2.2 to 10.2 [1,2]
The same microstrip antenna is designed on air substrate with a view to develop an efficient feed for parabolic reflector antenna, which shows an excellent radiation pattern with symmetrical 3 dB beam widths at its both E and H plane
An easy and handful relationship between the length of patch antenna and its fringing length for different types of substrate is established in the background of 3 dB beam widths
Summary
Improved gain for microstrip antenna is always desirable but along with this symmetrical or uniform radiation beam pattern in both the E and H plane is requisite for using it as an efficient feed for a parabolic reflector or to cover a wide area, for wireless communications. Microstrip antenna with such uniform 3 dB beam widths in both principal planes helps to illuminate the reflector antenna aperture which in tern reduces the tapering of field intensity near the edge of reflector surface and the gain of reflector can be increased. The theory is successfully utilized to evaluate the causes for uniform 3 dB beam widths which is verified using [9] and close agreement is revealed
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
