| Terahertz(THz)wave refers to the region of the electromagnetic spectrum which lies below visible light and above the microwaves in frequency.The field of terahertz science and technology has expanded exponentially over the last several decades,and various applications have been developed in the fields of non-destructive testing,military radar,time-domain spectroscopy,security imaging,and satellite communications.With the gradual maturity of the fifth-generation mobile communication technology,countries are embarking on discussions and researches on the sixth-generation mobile communication technology,which will inject new impetus into the development of THz technology.The sources of THz radiation and the devices that sense the THz radiation are the two most critical components of the terahertz technology.The basic design theories and implementation methods of Schottky diode THz detectors based on patch antenna coupling are studied in this dissertation.Three main subjects are as follows:Firstly,a terahertz antenna with a center frequency of 101 GHz is designed.The patch antenna is slot-coupled by the substrate integrated waveguide(SIW).The SIW resonant cavity is designed on layer of the the patch antenna,which improves the Simulated gain of the antenna from 5.2 dBi to 7.3 dBi.The S11 parameters of the antenna in the 97-105 GHz frequency band is less than-10 dB.The influence of the size parameters of the slot and metal patch on the antenna performance is investigated by simulation analysis.The antennas with 1×2 array elements and 2×2 array elements are further designed and measured,and the maximum simulation direction gain of the antennas is 10.1 dBi and 12.9 dBi,respectively.Secondly,a Schottky diode shunt THz rectifying circuit is studied.The characteristics of the diode shunt rectifying circuit are qualitatively analyzed from the theoretical formula.ADS(Advanced Design System)is used to model and simulate the rectifying circuit.When output power of the source is 1 dBm,the input impedance of the diode is 130 ?-j68?.A low-pass filter,whose simulation S21 parameters In the 52-109 GHz frequency band below-10 dB,is designed.According to the obtained diode characteristics,a diode shunt rectifying circuit is proposed.When the input power is 10 dBm,the output voltages of the rectifying circuit increase with the increase of the load:0.075 V(50?),0.138 V(200 ?),0.216 V(500 ?),0.273 V(1000 ?),0.301 V(3000?).Thirdly,based on the designed terahertz antenna and rectifying circuit,a terahertz detector operated in 98-104 GHz frequency band is proposed.The voltage response of the detector can reach 12980 V/W,and the equivalent noise power(NEP)can reach 2×10-8 W/Hz1/2.When the signal frequency output by the signal source is 101 GHz and the power is 10 dBm,the output voltage of a single array element detector is 0.048 V,and the output voltages of 1 x 2 array elements detector and the 2×2 array elements detector reach 0.067 V and 0.09 V,respectively. |
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