Abstract
The completely uniplanar broadband singly balanced diode mixers and FET amplifiers, which utilize coplanar waveguide and slot line as the main transmission lines, are presented. These mixers and amplifiers have several desirable features such as simplicity, wide bandwidth, good interport isolations, easy mounting of solid-state devices, and the absence of via-hole ground connections, that are suitable for low cost microwave integrated circuits (MICs) and monolithic microwave integrated circuits (MMICs). Two new types of uniplanar broadband singly balanced diode mixers are developed. The first mixer exhibits a conversion loss between 6 and 10 dB when the RF is swept from 7 to 10.5 GHz and the LO is 3.5 dBm fixed at 7 GHz. The measured IP3 is between-2 and 3 dB. The LO-to-RF isolation is better than 20 dB, the RF-to-IF and the LO-to-IF isolations are more than 36 dB. The other mixer has a conversion loss between 6.5 and 10 dB when the RF is swept from 10 to 11.6 GHz and the LO is 6 dBm fixed at 7 GHz. The measured IP3 is higher than 0 dB and the RF-to-IF isolation is better than 20 dB. The LO-to-RF and the LO-to-IF isolations are more than 16 and 38 dB, respectively. Two new uniplanar broadband singly balanced push-pull FET amplifiers are also developed. The first amplifier is designed in the unconditionally stable frequency range with the gain between 3.5 and 5 dB. The measured output 1-dB compression point (P1dB) is 14 dBm at 6 GHz and 19 dBm at 10 GHz. The other amplifier is designed in the potentially unstable frequency range with high gain between 10 and 11 dB. The measured output 1-dB compression point is 17.5 dBm at 2 GHz and 17 dBm at 4 GHz. These uniplanar mixers and amplifiers demonstrate the practicability of the proposed circuit configurations that can be used in the future.
Hsu, Pang-Cheng (1995). Uniplanar microwave balanced mixers and amplifiers. Master's thesis, Texas A&M University. Available electronically from
https : / /hdl .handle .net /1969 .1 /ETD -TAMU -1995 -THESIS -H78.