Question

subject: antenna and propagation
*important: the writing should be clear and easy to understand
*if possible i want to refer MR SHEETAL KUMAR to answer.

Q2. Design a rectangular microstrip antenna so that it will resonate at 5.43 GHz. The idealistic lossless substrate (RT/Duroid 6010.2) has a dielectric constant of 2.1 and a height of 0.150 cm. 1. Determine the physical dimensions (width and length) of the patch antenna. 2. Draw the microstrip dimension of this rectangular patch. 3. What is the real input impedance? (Neglect coupling) 4. Find the location (from the leading radiating slot) of coaxial feed so that the total input impedance is 150 0. AN MAI od 100 Acu

Answer 1

Sol=> Resonant frequency (fo) Dielectric constant (Er) = 2.1 Height cho 5.43 GHz = 0.150 cm Low 8 3 x 108 fr 3 x 10 5.43 x lot = 0.05525 m to = 5.525 cm (a) width of patch is given by ht Vo Er ti 2 2 to

W = 2.218 cm 2 W 3x12 2x (5.43x109) 2.1 +1 W = 2.762 X 0.8 value of Greff - ½ Ereff = Ex+1 2 Er-1 + ---[- 1+ 12x h b] 2.1+ + 2.4-212 Ereff It 12x 0.50 2 2118 Ereff = 1,55 + 0.55 (2+ 0.8115)-2

(d) From given data R= RIN cose (I y.) Yo = cosa R RIN yo = 1.894 cos 150 149,57 Yo = 1.894 x 1.000 ㅆ Yo = 0.6029 cm