Antenna Design and manufacturing課程名稱︰微波系統導論
課程性質︰選修
課程教師︰盧信嘉
開課學院：電資學院
開課系所︰電機工程學系
考試日期（年月日）︰2008/11/17
考試時限（分鐘）：3小時
是否需發放獎勵金：
（如未明確表示，則不予發放）company in Taiwan and Vietnam. The FT-RF main profession in R&D and manufacturing of antenna, be alongside of to be subjected to any OEM of nation and ODM, provide the product of the best quality and let the sale has the price of competition ability most , is the target that the FT-RF has been making great effort.
是
note: Open book
試題 :
Introduction to Microwave Systems
Midterm examination
1. (10pts) Please plot the following two traces from 1GHz to 3GHz on Smith
chart. Please indicate the frequencies at both ends of the traces
and Zo = 50 Ohm
a. Zin trace for a 40 Ohm resistor in series with a 4nH inductor.
b. Yin trace for a 100 Ohm resistor in parallel with a 0.6pF capacitor
2. (10pts) Fig 2.13 shows a matched 3dB attenuator. Find resistor values for a
matched 10dB attenuator.
3. (30pts) The measured two-tone test of a receiver is given at Fig. P3.
a. Find its output IP3, gain and P1dB.
b. The noise figure of the receiver is 6dB. If the receiver is
fed with an antenna with noise temperature Ta = 100K, and the
desired output SNR is 15dB, find the linear and spurious free
dynamic range. Assume the receiver bandwidth is 200MHz.
c. If ASK and basic threshold detection is used, what is the BER?
4. (15pts) The signal received by a GPS receiver is about only -130dBm using
a 0dB gain antenna at earth surface at L1 band.
a. Can you use a hign-gain antenna to increase the received signal
level? Please give your reason to support your answer.
b. What is the required EIRP at satellite? The satellite orbit is
20,200km above earth. Assume only free space propagation.
5. (10%) A used for a cellular base-station backhaul
radio link operating at 38GHz, with gain of 32dB.
If the radiation efficiency is 60%, find the beamwidth of the
antenna if the main beam is assumed to have equal beamwidths
in both planes.
6. (15pts) We will design a 3rd order Butterworth low pass fir with cutoff
frequency at 3.0GHz. There are two possible implementations:
started from capacitor or inductor. Please calculate all component
values for both cases. Larger inductance usually takes more
substrate area. Please comment on both cases based on
this criterion.
7. (10pts) The textbook uses W <- -Wc/W to transform low-pass firs into
highpass firs. Is it necessary to have the minus sign in
the transformation? Please give the explanation to support
your answer.
本文出自: https://www.ptt.cc/man/NTU-Exam/DE0A/D245/D298/DE42/D4C2/M.1260102866.A.AC3.htmlFT-RF
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