Nonlinear circuits with quasi-Yagi antennas for 60 GHz wireless applications.

摘要

A dielectric resonator balanced second harmonic antenna-integrated self-oscillating mixer at 60 GHz exhibits a conversion loss better than 15 dB from 60 to 61.5 GHz, a 20 dB reduced radiation into main beam direction, and an IF phase noise of −95 dBc/Hz at 100 kHz offset. The modal radiation characteristics of a dual feed planar quasi-Yagi antenna are used to achieve isolation between closely spaced RF and LO. The balanced mixer is symmetric, inherently broadband, and does not need an RF balun.; A compact fourth-harmonic single side band Schottky diode upconverter for 60 GHz wireless applications has a high maximum output power of −7 dBm and a 20 dB conversion loss when driven by 23 dBm LO at 15 GHz. In SSB scheme two mixers are fed with LO signal 22.5° out of phase, and with orthogonal IF signals. Each subharmonic mixer has two anti-parallel diode pairs with quadrature LO excitation and equal IF excitations.; A quasi-Yagi antenna based microstrip to rectangular waveguide transition at V-Band achieved a minimum and maximum insertion loss of 0.3 dB and 3 dB.; A conical horn antenna excited with a planar quasi-Yagi antenna comprise a microstrip to circular wave guide transition and a conical horn antenna into a single unit. Non-contacting transition relax mechanical tolerance requirements. Antenna is simple to fabricate and feed, and provides single mode operation with medium gain and bandwidth. A gain of 16.5 dB with cross polarization of 19 dB is measured at 60 GHz, −11 dB return loss bandwidth of 4 GHz is achieved from 59 GHz to 63 GHz.; A conical horn antenna excited with a planar quasi-Yagi antenna horn transition is integrated with a meanderline polarizer. At the 60 GHz center frequency the gain into each linear polarization was 7 dB, the return loss 10 dB, and the axial ratio 1.8 dB. In the frequency range 58 to 62 GHz gain was better than 6 dB into each linear polarization, and the return loss was better than 9 dB.; Simultaneous Transmission of LO and RF at 60 GHz is demonstrated.