Design and analysis of a broadband 4‐way high power combiner in the VHF/UHF band

High‐power combiners with terminating resistors for DTV applications in the frequency range of 470–860 MHz

“…Structure Operating freq. Applications and properties [4] two-way multi-section microstrip 2-10.2 GHz low power with multivalued SMD isolation resistors [5] two-way tapered-microstrip 2-10.2 GHz low power with multivalued SMD isolation resistors [8] eight-way planar stripline 1-1.3 GHz high power with externally connected terminations as isolation resistors [9] two-way microstrip 3.5-8 GHz low power with a 50 Ω isolation resistor [10] two-way microstrip 0.66-1.34 GHz low power with multivalued SMD resistors [1] two-way coaxial cable 30-500 MHz 500 W with 50 Ω isolation resistors [12] four-way coaxial cable 30-500 MHz 500 W with 50 Ω isolation resistors [15] eight…”

“…The insertion loss is usually independent of RF power as the passive components used in the construction of the combiner are power-independent. Under this condition, the efficiency can be calculated from the measured insertion loss [12]. The insertion loss of the power combiner above the theoretical value of 3 dB is <0.4 dB for the entire operating frequency (Fig.…”

“…A two-way power combiner in the frequency range of 30-500 MHz was introduced in [1]. A four-way power combiner of the same family was presented in [12]. Although this type of combiner is wideband and has high power capability, its implementation is difficult and is very sensitive to asymmetries in the construction and layout.…”

Design and fabrication methodology for industrial broadband high power amplifiers

“…The‐state‐of‐the‐art research literature and the recent novel industrial works are employed to extend the analytical method to the generalised interpolation method resulting in closed‐form formulas to obtain N BEL . The trend of the two‐way binary power combiner characteristics, extracted from the state‐of‐the‐art researches [17–27], is shown in Fig. 6; also, the trend of the parallel power combiner characteristics, extracted from the state‐of‐the‐art works [24–50], is also illustrated in Fig.…”

“… Extracted trends of the state‐of‐the‐art technologies for the two‐way binary structures are illustrated. A graph was fitted to estimate the single‐stage insertion loss, A α , in the binary structure versus the octave bandwidth and the centre frequency [ 17 – 27 ] …”