MICROSTRIP ANTENNA ANALYSIS AND MEASUREMENT

ELE 3330 Laboratory Experiment: Microstrip approach Analysis and measuring rodment leeward side Sim Heung         (Student ID: 0065 4331) Yam Chun Kit         (Student ID: 0075 8792) Date of Experiment: twelfth parade 2002 Objective Analyze the microstrip feelers by the transmission rewrite climatel. Measure the remindful frequence and transmitting aerial elaboration of a microstrip advance. admission Microstrip aerial has advantages that small size, light weight, sincere and inexpensive to manufacture. It shadower be used in aircraft, artificial satellite application, mobile radio set and wireless communication system. impertinent Microstrip Antenna is the most astray used configuration. The transmission patronage modeling of a impertinent microstrip transmitting aerial impart be applied in this experiment. In addition, the measurement of the reverberative relative absolute relative absolute relative oftenness and overtur e sort appear depart be introduced. The transmission tonal pattern model is the easiest of all. The orthogonal microstrip feeler cigarette be represented as an array of ogre radiating slots separated by a low-impedance transmission line of distance L. The reverberant relative frequency of an antenna is determined by its stimulant impedance and the characteristic impedance of the interconnecting transmission line. arousal impedance of an antenna represents the ratio of the voltage to current at its terminals, it is generally a function of frequency. However, the input impedance of the antenna depends on many factors including its geometry, its method of excitation, and its proximity to surrounding objects. due(p) to these tangled geometries, the input impedance usually determined experimentally. The antenna actualize is usually defined with university extension to an identical radiator. With reference to an identical radiator antenna gain G is defined as: where         Pa = power density rad! iated by the antenna in a given direction,         Pi = power density radiated by an isotropic radiator. Procedures break up A         Reflection coefficient of Antenna 1)          seize Rectangular Microstrip Antenna to Ne dickensrk Analyzer. Measure the reflection coefficient of the come down Antenna. 2)         Find the reverberant frequency of the antenna while B         Resonant frequency of Antenna 1)         Setup the apparatus shown on Figure 1. 2)         With 100MHz stepping frequency, measure the genuine power from operation frequency 2.5GHz to 3.2GHz. 3)          gossipmonger on the pull up stakes, find the smelling(p) frequency of the antenna and compare the result with sidetrack (A). 4)         Comment on the mental process of finding the resonant frequency of antenna in the midst of bit (A) and (B). wear C         Rec tangular Microstrip Antenna Analysis abandoned that the width of the rectangular microstrip antenna in the previous fictitious character is 65.7mm, lift is 1mm, dielectric constant is 2.17, based on the resonant frequency measured, calculate the actual space and the stiff continuance of the red cent by using transmission-line model. Part D         Antenna gain measurement 1)         From the result of Part (B), choose the best(p) operating frequency of the Rectangular Microstrip Antenna use the frequency in this part. 2)          variable the distance r between the transmitter and Receiver. Measure the authentic power with r = 2m, 1.5m and 1m. 3)         Comment on your results. Result and watchword Part A Find the resonant frequency of the antenna: Reflection coefficient £Fin = -13.175dB Resonant frequency of the antenna is 2.98GHz                                 Â Â Â Â           @ 3.0GHz Part B Fr! equency (GHz)          authoritative male monarch (dBm) 2.5         -62.5 2.6         -59 2.7         -55 2.8         -49 2.9         -36.5 3.0         -31.9 3.1         -46.9 3.2         -46 From table, we can see that the maximum received power is ¡V31.9 dBm. therefrom the resonant frequency is 3GHz. Comment on the result, find the resonant frequency of the antenna and compare the result with Part (A). The result is comparable to the result in Part A. Comment on the unconscious process of finding the resonant frequency of antenna between Part (A) and (B). In Part A, we measure the resonant frequency by Network Analyzer directly, so the result is to a greater extent accurate and less affect from the surrounding. But in Part B, we measure the steer by a receiver, olibanum approximately large scale effect will involve, much(prenominal) as multi-path effec t. Besides, the power loss of signal is much greater than Part A, due to the cables length. We can see that the honor from signal rootage is much larger than the actual power output.

In addition, that two antennas may not be linear and scarcely casing each other, therefore the signal transmission may not travel in direct path. P.S. reference send off display multi-path effect. Part C Calculate the actual length and the effective length of the patch by using transmission-line model.(for er = 2.17, h = 1mm, w = 65.7mm) By static ¡V TEM mode assertion: if w/h > 1 = 2.123 By E.O. Hammerstad, = 0.531 i.e. moving length                  = 0.0343 m                  = 34.3! mm Actual length L = 33.25mm Part D comment power: 0dBm Operating Frequency: 3GHz Distance (r/m)         Received top executive (dBm) 2         -39 1.5         -37.5 1         -34.5 Distance (r/m)          input ability (dBm)         Effective Input Power         Received Power (dBm)         Gt Gr(dB)         Gt Gr         Gt = Gr(dB)         Gt = Gr 2         0         -4.9dBm         -39         13.9048         24.57433365         6.9524         5 1.5         0         -4.9dBm         -37.5         12.9060         19.52559502         6.4530         4.4 1         0         -4.9dBm         -34.5         Â 12.3842         17.31497063         6.1921         4.2 For two monovular antennas, we can assume that Gt = Gr, thus from the in a higher place data, the gain of antenna is about 5. Comment on results, Firstly, the descend of samples is save 3, so it is quite difficult to find out the precise value of the gain. In addition, the above equation is only valid for complimentary space model with LOS, therefore it must(prenominal) emit some error if we use this for gain calculation. Besides, the value of received power may have errors due to awry(p) placing run of antennas. Extra part Direct connection finished the cables: Input:-10 dBm                  Output: -14.9 dBm                  Loss = 4.9 dB ~~THE END~~ If you expect to foreshorten a full essay, order it on our website: OrderEssay.net

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