Title :
Planar amplifier array with improved bandwidth using folded-slots
Author :
Tsai, H.S. ; Rodwell, M.J.W. ; York, R.A.
Author_Institution :
Dept. of Electr. Eng., California Univ., Santa Barbara, CA, USA
fDate :
4/1/1994 12:00:00 AM
Abstract :
Active antennas on semiconductor substrates often suffer limited bandwidth. We report on a relatively broadband quasi-optical amplifier cell and 4/spl times/4 array using folded-slot antennas, suitable for monolithic power combining. Two orthogonally polarized CPW-fed folded slots are coupled to the input and output ports of a simple resistive feedback MESFET amplifier. The peak effective isotropic power gain in the transmission mode is 11 dB @ 4.3 GHz with 10% bandwidth for the single cell, a factor-of-ten improvement in bandwidth over a similar amplifier cell using patch antennas, and 32 dB @ 4.24 GHz with 8% bandwidth for the array.<>
Keywords :
Schottky gate field effect transistors; active antennas; feedback; microwave amplifiers; microwave antenna arrays; microwave integrated circuits; slot antennas; 11 to 32 dB; 4.24 to 4.3 GHz; MIC; SHF; active antennas; bandwidth improvement; broadband; folded slots; monolithic power combining; planar amplifier array; polarized CPW-fed slots; quasi-optical amplifier cell; resistive feedback MESFET amplifier; slot antennas; Antenna arrays; Bandwidth; Broadband amplifiers; Broadband antennas; Couplings; MESFETs; Output feedback; Polarization; Power amplifiers; Substrates;
Journal_Title :
Microwave and Guided Wave Letters, IEEE
