Introduction: The new wireless and mobile communication systems use miniature Radio Frequency (RF) module design technologies to satisfy low-cost and compact size. Theses requirements are critical for some specific application such as bandpass filter, diplexer, and coupler to reduce the cost and size of mobile system. Recent advances in integration technology and device performance paved the wa...

This paper describes the design and measurement of a varactor-tuned planar diplexer for reconfigurable multi-mode/multi-standard transceiver front-end modules. The proposed diplexer of 3 cm × 1.8 cm is composed of two tunable dual-mode bandpass filters with two varactor diodes. The diplexer channels are 8.8% relative bandwidth at 2.48 and 3.2 GHz for 25 V biased voltage, while 7.5% and 4.1% are...

A lowpass-bandpass (LP-BP) diplexer with one lowpass channel (LPC) and bandpass (BPC) is presented. The lumped-element dual-resonance resonator as common proposed to connect inductors, capacitors LC constitute the desired channels. LPC design combined parameters optimization transformation method, BPC can be developed using classical theory of coupled-resonator filter. As an example, a 0.9 / 1....

A novel compact diplexer based on mixed-mode isosceles right triangular (IRT) substrate integrated waveguide (SIW) cavities is presented. dual-mode IRT SIW junction cavity direct-coupled with two single-mode for lower and upper channels, respectively. The has third-order filtering centred at 16 18.3 GHz 400 422 MHz bandwidths. in-band measured return insertion losses are 19 dB/1.3 dB in the ban...

A four-port diplexer consisting of two back-to-back three-port diplexers combined with a 180° phase shifter in one branch is presented. The technique achieves high Tx/Rx isolation with relatively low degree filters. Two experimental diplexers are demonstrated, one with equal Q resonators in all filters and the other with dissimilar Q factors, enabling miniaturization and cost reduction. Measure...

The bifurcated E-plane T-junction is presented. Its advantages with respect to waveguide diplexer design are: It allows full E-plane height operation, thus permitting good power handling capability, is simple to model, and provides additional tuning parameters for the computer-aided design. The performance of the junction is compared to those of other junctions and its advantages are demonstrat...

The mode-matching technique is deployed in this paper in order to analyze and design a substrate integrated waveguide (SIW) T-junction diplexer in Ku-band. The diplexer has bandwidths of 4.12% and 3.79% at 14.55 and 15.85 GHz, respectively. Also in Ku-band, an SIW corner filter is analyzed and designed with the same technique. Analytical results are compared with simulated data obtained from co...