Power Divider

A novel low-loss planar dielectric waveguide is proposed. It is based on a high-permittivity dielectric slab parallel to a metal ground. The guiding channel is limited at the sides by a number of air holes which are lowering the effective permittivity. A mode with the electric field primarily parallel to the ground plane is used, similar to the E11x mode of an insulated image guide. A rather thick gap layer between the ground and the high-permittivity slab makes this mode to show the highest effective permittivity. The paper discusses the mode dispersion behaviour and presents measured characteristics of a power divider circuit operating at a frequency of about 8 GHz. Low leakage of about 14% is observed at the discontinuities forming the power divider. Using a compact dipole antenna structure, excitation efficiency of more than 90% is obtained.

In recent years substrate integrated waveguide technology (SIW) has been applied successfully to the
conception of planar compact components for the microwave and millimeter waves applications. In this
study, a V-band substrate integrated waveguide coupler, power divider and circulator are conceived and
optimized by Ansoft HFSS code. Thus, through this modeling, design considerations and results are
discussed and presented. Attractive features including compact size and planar form make these devices
structure easily integrated in planar circuits.

— In this work, a novel electrical reconfigurable second order microstrip bandpass filter is presented. The investigated filter structure consists of two neighbour coupled octagonal-DGS resonators. The capacitor and varactor are placed on the DGS-shape. According to the tunable characteristic of discrete lumped capacitors and varactor diode, the resonant frequencies can be tunable. The proposed filter occupiers an area of 2.5 x 1.5 cm2. The coupling method has been applied and leads to an extended coupling matrix that assumes multiple couplings between both filter resonators. The measured relative tuning range of the bandpass filter is 23.5% with a fractional bandwidth of 12%. Varactors loaded on the octagonal DGS resonator allow us to control the center frequency with quasi constant bandwidth as well as to have a large tuning bandwidth. Based on the detailed analysis, the varactor-tuned DGS bandpass filter is designed, in which the tuning bandwidth reaches 12 % of the center frequency at 5 GHz. The proposed reconfigurable bandpass filter was fabricated and tested. The measured results show a variation of the center frequency from 4.3 GHz(0V)-to 5.4 GHz(15V) tunable range, while the insertion loss varies from 5 dB to 3 dB. The measured performance of the tunable bandpass filter agrees well with the simulation results.

The Wilkinson power divider (WPD) is one of the most common components used in balanced mixers, phase shifters, amplifiers and antenna array feed networks. It is lossless if the output ports are matched, reciprocal, and the output ports are largely isolated. Many designs and modifications such as multisections, open circuited stubs or tapered transmission were proposed to increase the bandwidth of the conventional Wilkinson power divider.

The Substrate Integrated Waveguide (SIW) technology is a very promising technique with which we can take the advantages of both waveguides and planar transmission lines. Therefore, in [2.1-3] GHz band various microwave components and devices have been designed successfully using Ansoft HFSS software.
We then proceeded to the realization of the coupler and then made measurements of the frequency response in the range [2.1-3] GHz using a network analyzer. Thus, results of this modeling are presented, discussed and allow to integrate these devices in planar circuits.

In recent years substrate integrated waveguide technology (SIW) has been applied successfully to the conception of planar compact components for the microwave and millimeter waves applications. In this study, a V-band substrate integrated waveguide coupler, power divider and circulator are conceived and optimized by Ansoft HFSS code. Thus, through this modeling, design considerations and results are discussed and presented. Attractive features including compact size and planar form make these devices structure easily integrated in planar circuits.

A Ku-band Substrate Integrated Waveguide power divider is proposed. In this work, the SIW power divider is designed with T-junction configuration. The SIW technique enables the power divider to have low insertion loss, low cost and features uniplanar circuit. An additional of metallic via hole is added in the center of the junction to improve the return loss performance of the T-junction SIW power divider. The simulated input return losses at port 1 are better than 27 dB, and features equal power division of about-3.1 dB ±0.4 dB at both output ports across frequency range of 13.5-18 GHz. The SIW power divider is fabricated, and the measurement results show acceptable performances. Since there are some losses contributed by the SMA connector of the fabricated SIW power divider prototype, an additional SIW transmission line is simulated and fabricated to analyze the connector loss.

Abstract This letter presents the design of a compact planar in-phase power divider with ultrawideband (UWB) performance. The device consists of three T-shaped microstrip lines arranged in parallel to each other on one side of the dielectric substrate that are electromagnetically coupled with an H-shaped slot etched on its ground plane. Particle swarm optimization (PSO) and the finite-difference time domain (FDTD) are combined to achieve the optimal power divider design for a given specification. The measured results ...

The improved version of a broadband planar magic-T using microstrip-slotline transitions is presented. The design implements a small microstrip-slotline tee junction with minimum size slotline terminations to reduce radiation loss. A multisection impedance transformation network is used to increase the operating bandwidth and minimize the parasitic coupling around the microstrip-slotline tee junction. As a result, the improved magic-T has greater

Résumé/Abstract High speed frequency dividers are critical parts of frequency synthesisers in wireless systems. These dividers allow the output frequency from a voltage controlled oscillator to be compared with a much lower external reference frequency that is commonly used in these synthesisers. Common trade-offs in high frequency dividers are speed of division, power consumption, real estate area, and output signal dynamic range. In this paper we demonstrate the design of a high frequency, low power divider in 0.18 μm SiGe ...

A Ka-band monolithically integrated 4 ?? 1 corporate-fed cavity-backed patch antenna array is demonstrated in this paper. A single antenna element has four slits introduced to extend the bandwidth to about 8%. Its gain and radiation efficiency are 6.3 dBi and 97%, respectively. A rectangular ??-coaxial line based combining network is monolithically integrated with radiating elements in a slightly modified

In this paper, a miniaturized front-end six-port
receiver prototyped by 130 nm CMOS technology at 60 GHz
frequency band is presented. The proposed six-port circuit
consists of three compact 3dB branch-line couplers (BLC) and
one compact Wilkinson power divider (WPD). Two
miniaturization techniques are used; meandering thin-film
microstrip transmission lines (MTFM) and capacitive loading
(CL). These two techniques lead to dramatic size reduction which
is desirable for MMIC technology. Moreover multi-level
metallization processes, offered for CMOS technology, is used.
The results are provided based on a full-wave commercial
electromagnetic package, ADS Agilent. The simulated results
show good impedance characteristics over 57-64 GHz frequency
band. The S-parameter results, as well as constellation diagram
of QPSK modulation with data rate of 3.52 Gbps for three
different cases confirm the capability of miniaturized six-port
circuit for high data-rate wireless personal area network
(WPAN) applications at 60 GHz frequency band.