Wideband HNRD guide directional coupler based on multi-hole coupling structure for V-band

UWB double‐ridge waveguide coupler with low loss

“…Fortunately, the ranges of levels of power handling capability are acceptable and still significantly higher than those achievable with other couplers such as microstrips. For the WRD650 waveguide, the average power handling is 1.5 kW and the peak power handling is about 3 kW …”

“…Our design uses the cross shape because the coupling coefficients for the magnetic and electric fields can be adjusted independently . Previous double‐ridge cross‐directional couplers use multiple holes to increase the bandwidth, which results into larger coupling coefficient and bulky structures . One goal of the proposed design is to avoid the presence of an attenuator, which is required when the coupler is used to measure RF power.…”

“…For the WRD650 waveguide, the average power handling is 1.5 kW and the peak power handling is about 3 kW. 9 The directivity of the cross waveguide depends on the location of the coupling aperture and is defined as 7…”

“…10 Previous doubleridge cross-directional couplers use multiple holes to increase the bandwidth, which results into larger coupling coefficient and bulky structures. 9 One goal of the proposed design is to avoid the presence of an attenuator, which is required when the coupler is used to measure RF power. In fact, when the output RF power is high, attenuators must be used before RF power meters to protect them against damage.…”

“…A directional coupler operating at the C, X, Ka, and Ku bands (6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18) is designed and fabricated to be used for satellite transponder applications, where it is required to sample high-power and ultra-wide band (UWB) signals. Its coupling coefficient is below 250 dB and this feature presents the advantage of eliminating the attenuator at the coupling port when sampling in high-power applications.…”