Power Divider

— 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 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 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.

In this paper we investigate the propagation behavior of a square shaped planar meta-material guiding structure comprised of left-handed and right handed square unit cells each of the same size and arranged in a checker-board tessellation. The size of the planar structure is 19 cells by 19 cells and each cell is 8 mm by 8 mm. At 1 GHz, the left-handed unit cells have an insertion phase of 11deg and the right-handed unit cells have an insertion phase of -11deg. Both types of cells have the same Bloch impedance. The structure was fed at the centre unit cell, and there are a total of 76 peripheral ports each terminated in matched loads. At 1 GHz the power to each peripheral is equal and the phases at each port alternate between two values that differ by 11deg. Moreover, the planar structure exhibits the so-called infinite wavelength phenomenon in two dimensions and could be used in place of a circular radial power divider.

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.

A novel design of ultra-wideband (UWB) monopole antenna is proposed with small size for UWB applications. An equivalent circuit for the proposed monopole antenna is obtained using the Advanced Design System (ADS). A parametric study for the major effective parameters of the antenna is done to study the effect of these parameters and get the optimized values of the antenna parameters. An UWB power divider circuit is designed to be used for exciting 2x1 and 4x1 linear antenna arrays to increase the antenna gain. The antenna element, UWB power divider and antenna arrays are simulated using CST-Microwave Studio and fabricated on FR-4 substrate with dielectric constant of 4.5 and thickness of 1.5 mm. The average gain for the two-element antenna array is about 5.3 dBi and reaches to7.15 dBi for the four-element antenna array, over the whole UWB frequency range. A good agreement between the measured and the simulated results for the antenna element, power divider and antenna arrays is appe...

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.