A planar parabola-feed frequency multiplier

Abstract

A novel quasi-optical all-planar frequency doubler that could provide an alternative approach to conventional waveguide circuits for millimeter-and submillimeter-wave signal generation is presented. The multiplier uses a quad-bridge diode configuration for inherent isolation between the input and output signals. Two pairs of double-slot antennas with orthogonal polarizations directly couple input and output signals to the diodes, without the need for hybrid couplers required in typical balanced circuits. The integrated quad-bridge-diode/slot-antenna circuit is mounted on a dielectric-filled parabola for coupling to quasioptical propagation systems. Measurement results for an X to K-band doubler show frequency conversion loss of 6.8 dB at the output frequency of 20.3 GHz.Index Terms-Dielectric-filled parabola, diode frequency multiplier, slot antenna.

High efficiency diode doubler with conjugate- matched antennas

“…In other frequency multipliers where the input signal is much larger (e.g. at least 5 dBm) conversion loss values of around 10 dB are expected [4].…”

Micromechanical tuning elements in a 620-GHz monolithic integrated circuit

“…Such circuits are fabricated through photolithographic techniques alone, making them simpler and more cost-effective than conventionally machined waveguide circuits. A variety of these circuits have been demonstrated using a substrate lens to quasi-optically couple millimeter and submillimeter-wave signals to planar antennas and devices [5]- [7]. This approach can provide better reproducibility and reliability, allow for the creation of focal plane-imaging arrays without an increase in the complexity of the fabrication process [8], and could potentially allow for the inclusion of intermediate frequency (IF) circuitry to form fully integrated receivers.…”