Question

Question Soalan 1 A 50Q microstrip line is built on a FR-4 substrate which the specification is given in Table .The line is connected to an ultrasonic sensor of 100 Q Satu garis mikrostrip 50 Q dibina pada substrat FR-4 yang mana spesifikasinya diberikan dalam Jadual 1. Garis ini disambungkan kepada sensor ultrasonik 100 Q Table 1 Jadual 1 Specifications Dielectric Constant Dissipation factor Substrate thickness Copper thickness Surface resistance Operating frequency 2.4 GHz Value 4.7 0.019 1.6 mm 35um 0.030 (C4, CO1, PO2) Calculate the width of the 50 Q microstrip line. Assume that Wld is less than 2. (a) [Kira lebar garis mikrostrip 50 Q. Anggap Wid adalah kurang daripada 2. (3 Marks/ Markah) (C5, CO1, PO2) Evaluate the load mismatched of the terminated line in terms of its return loss and (b) voltage standing wave ratio value. INilaikan beban yang tidak sepadan bagi garis ditamatkan dari segi nilai kehilangan pantulan dan nilai nisbah voltan gelombang berdiri,] (3 Marks/ Markah) (C6, CO1, PO2) (c) Propose which type of matching network that can be applied to minimize the load mismatched calculated in (b) and justify your answer. Then, you are required to design the proposed matching network by illustrating the microstrip layout with its dimensions. Assume that Wld is less than 2. Cadangkan jenis rangkaian padanan yang boleh digunakan untuk mengurangkan beban tidak sepadan yang dikira dalam (b) dan berikan justifikasi kepada jawapan anda. Kemudian anda dikehendaki merekabentuk rangkalan padanan yang dicadangkan dengan menggambarkan susun atur mikrostrip bersama dimensinya Anggap Wid adalah kurang daripada 2 (8 Marks/ Markah) e valuate the total attenuation n de intro duced by tHe length oF te mas chins networ s Cal culated In (C) 3/-

microwave communication

Answer 1

caidth +-95X cobee Zo impdana h - 50 thickroas Era dialedtic constant4. aca thickress- 35um 5x.35xi06 7-48x.6)x13 X J-25X35XIO 8T a 002891 O00004315 00284 m 2.84mm 50 b) Sounca imadana 7- (2L-18) I00-50 100450 Noltope Starding Wave Ralio CVSWR)= 1+- + T1-13 A-2 Patcon Jes 3 loy 20log Co)6.02de 20 DATE:

Mismatch 188 = -10 0.5dB