Marek Kitlinski

A 3-dB multilayer coupler with UC-PBG structure

A novel broadside coupled stripline coupler with a uniplanar compact photonic bandgap (UC-PBG) structure is presented. Construction of the coupler is based on a stripline with two-dimensional periodically etched ground plane. The slow-wave phenomenon has been predicted and observed. Numerical and experimental investigations show an enhanced backward coupling effect. The usefulness of both phenomena in the coupler construction has been verified experimentally.

Design of MM-Wave MIC Frequency Multipliers and Mixers using Simple Microstrip High-Pass Filters

General requirements on semiconductor device embedding impedances in mm-wave MIC frequency multipliers and converters have been discussed. Preferred filter types in different circuit paths have then been defined showing the utility of high-pass filters. Microstrip with short-circuited edge has been introduced as a high-pass filter realizable at mm-wave frequencies and successfully employed in a 20-40 GHz subharmonically pumped mixer.

Improved compact low-profile quadband planar monopole antenna for mobile handsets

A compact internal planar monopole antenna capable of multiband operation of mobile handsets is presented. The antenna has a very low profile and covers GSM900, DCS1800, PCS1900 and UMTS2050 bands. The two operating modes of the proposed antenna are associated with various length of two monopoles, in which the shorter monopole is resonating as a quarter-wavelength structure and the longer one resonating as both a quarter-wavelength and a half-wavelength structure. The radiator of the proposed antenna is embedded in dielectric medium to improve its characteristics.

Slow-wave resonant structures in branch-line coupler miniaturization: A case study

A case study of novel slow-wave resonant structures dedicated to efficient microstrip branch-line coupler size reduction has been presented. A compact 3-dB branch-line coupler has been designed to mimic the performance of its conventional counterpart, simultaneously demonstrating a substantial 88% surface area reduction. The vital usefulness of the approach in the process of microstrip line abbreviation has been experimentally validated. The measured in-band results are in excellent agreement with theoretical characteristics, while the out-of-band performance depicts an efficient suppression of unwanted signals up to the 6th harmonic.

A Novel Approach to Multiple Ring Antennas: Modified Monopole as a Solution of Multiband Antennas for HiperLAN1/2 and IEEE 802.11b/g Standard Devices

A compact planar antenna for multisystem applications has been designed and manufactured. A modified feeding method has been used to meet the requirements of modern telecommunications devices. It has been shown, that by adjusting the size of the rings, required allocation of bands is possible. The proposed antenna is suitable for ISM band devices and gives perspectives for multi-standard operation. The antenna has been simulated using MoM 2.5D software Zeland IE3D, next fabricated and measured.

Broadside coupled stripline with double-side UC-PBG structure

A stripline waveguide with double-side UC-PBG pattern is considered. To verify usefulness of the stripline structure with UC-PBG a 3 dB coupler has been designed and fabricated. Reduction of the coupler size (due to slow wave effect) has been predicted and observed. Numerical and experimental investigation confirmed enhanced backward coupling phenomena.

An Integrated Periodic Structure in Silicon Technology to Improve Power Amplifier Parameters

A new integrated periodic structure in silicon technology has been introduced to a power amplifier (PA) interstage matching network. Through the broadband matching characteristics and filtering abilities the PAs parameters have been significantly improved.

Sierpinski monopole antenna-uniplanar feeding technique

Various feeding techniques for Sierpinski fractal monopole antennas are considered. To find low profile uniplanar antenna construction a novel feeding technique has been proposed: coaxial-fed with extended ground plane and coplanar waveguide with finite dimensions of the ground plane. The measurements of the fabricated antennas prototypes confirm usefulness new feeding technique.