6. Design a patch antenna to be resonant at 3 GHz using substrate RO 3010 (h = 3.175 mm. ER = 10.2). a) What are the wid

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6 Design A Patch Antenna To Be Resonant At 3 Ghz Using Substrate Ro 3010 H 3 175 Mm Er 10 2 A What Are The Wid 1 (52.59 KiB) Viewed 14 times

6. Design a patch antenna to be resonant at 3 GHz using substrate RO 3010 (h = 3.175 mm. ER = 10.2). a) What are the width and length of the patch? b) What is the input resistance at the edge of the patch? c) Estimate the directivity. d) Suppose you wish to feed the patch with a 50 micro-strip line. What should be the intrinsic impedance of a quarter-wave transformer in order to match the feed to the patch? 7. A circular aperture of radius a = 22 is mounted on a ground plane and uniformly illuminated a) Where are the E-plane nulls? b) Where are the side maxima in the E-plane? c) What is the HPBW in the E-plane? 8. Consider a constant current loop antenna with C = 1 and 8 turns operating at 2 GHz. The radius of the wire is 1 mm. Ignore the proximity effect. Assume the conductivity of the wire is o = 107 mho/m. a) What is the radiation resistance of the loop? b) What is the loss resistance? c) What is the inductance of the loop? (You may ignore internal inductance, as it is negligible.) d) What capacitance should be put in series with the loop to resonate it? e) What is the radiation resistance if the loop is wrapped around a high permeability Length ferrite core with = 12 diameter 9. A 7 by 7 uniform square array of isotropic elements has its main beam at p = 15°, 8 = 20°. The array spacing is d = 2/10 in both directions. a) What are the phase shifts? b) What is the directivity of the array? 10. A metal sphere 1 meter in diameter is used as a calibration target at an RCS range. At 10 GHz, what is the minimum distance from the radar antenna to ensure that it is in the far field of the sphere?