Technical Articles

articles, application notes and useful information for design engineers

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Amplifier

Antenna

Automotive

Coupler

E-band Radio

Environmental

Filter

Measuring Dielectric Properties/Laminate Characterization

Multilayer / RF Digital

Oscillators

Passive Intermodulation (PIM)

Radio Links

RFID

Semiconductors & PTFE

Wave Guide

Wearable Antenna

Amplifier

Exact Simulation of LNAs Reduces Design Cycle Times
RF-35, LNA design, return loss, gain, noise
VIEW ARTICLE

A 45W amplifier for 23cm
RF-35, power amplifier, LDMOS technology
VIEW ARTICLE

Antenna

Microstrip-fed Wideband Circularly Polarized Printed Antenna
RF-35, symmetrical dipole, circular polarization, printed dipole antenna, slot antenna
VIEW ARTICLE (Oct. 2010)

Radial EBG cell layout for GPS patch antennas
CER-10, electromagnetic-bandgap cell. EBG, GPS, patch antenna
VIEW ARTICLE (June 18, 2009)

Compact Patch Antenna for Electromagnetic Interaction With Human Tissue at 434 MHz
RF-35, 434 MHz, human tissue, hyperthermia applicator, specific absorption rate, SAR
VIEW ARTICLE (Sept. 2009)

In-silico hyperthermia performance of a near-field patch antenna at various positions on a human body model
RF-35, 434 MHz, RF hyperthermia treatment, near field, patch antenna
VIEW ARTICLE  (May 13, 2011)

Omnidirectional circularly-polarised microstrip patch antenna
RF-35, omnidirectional, circularly-polarised, CP, patch antenna
VIEW ARTICLE (May 24, 2012)

Ultra-Wideband Antenna Array Design for Target Detection
TLC-30, UWB, planar antenna, 3.1 - 10.6 GHz  
VIEW ARTICLE (2012)

Retrodirective Rotman Lens Antenna
RF-60A, Rotman Lens antenna, 8 - 12 GHz
VIEW ARTICLE (NO DATE)

An Active High-Impedance Surface for Low-Profile Tunable and Steerable Antennas
RF-60A, artificial magnetic conductor, AMC, frequency selective surface, FSS, steerable antenna, tunable AMC. 2.36 - 2.82 GHz
VIEW ARTICLE (2009) 

Artificial magnetic surface for circular polarization improvement
TLY-5, CER-10, antenna, circular polarization, CP; frequency selective surfaces, FSS; artificial magnetic conductors, AMC; cross polarization discrimination, XPD
VIEW ARTICLE (Nov. 2009)

Planar High-Gain WLAN PCB Antenna (Strategies for Designing Microwave Multilayer Printed Circuit Boards Using Stripline Structures)
TLY, antenna gain, directive antennas, microstrip antenna, WLAN, 5.6-6.3 GHz
VIEW ARTICLE(NO DATE)

Considerations for EBG Loss in Antenna Applications
RF-35, 2.8 GHz slot antenna, EBG (electromagnetic band gap) structure
VIEW ARTICLE (NO DATE)

Circular and Elliptical CPW-Fed Slot and Microstrip-Fed Antennas for Ultrawideband Applications
TLC-30, circular, coplanar waveguide (CPW), elliptical, microstrip, slot, ultrawideband (UWB)
VIEW ARTICLE (May 2006)

Miniaturization of microstrip patch antenna
TLY, microstrip patch antenna, electromagnetic bandgap substrate (EBG), 2.4 GHz
VIEW ARTICLE(NO DATE)

A Printed Dipole Antenna With Optimised Tapered Feeding Balun For ISM and FWA Bands
TLY, wideband antenna, printed dipole, tapered balun, low-Q antenna, ISM/FWA
VIEW ARTICLE (NO DATE)

Dual Polarized Microstrip Patch Antenna, Reduced in Size by Use of Peripheral Slits
TLY, microstrip patch antenna, size reduction
VIEW ARTICLE (NO DATE)

Design optimisation of ring elements for broadband reflectarray antennas
RF-35, broadband reflectarray antenna
VIEW ARTICLE(Oct. 2003)

Microstrip Patch Antenna for GPS application
TLC-32, microstrip patch antenna, GPS
VIEW ARTICLE(NO DATE)

Design and Analysis of an Electrically Steerable Microstrip Antenna for Ground to Air Use
TLY, polarized microstrip antenna, 2.45 GHz, avionics
VIEW ARTICLE(May 2002)

Design and Development of Printed Antenna Remote Units for Optically Distributed Mobile Communications
TLX-8, bandpass filter, antenna remote unit, ARU
VIEW ARTICLE (Dec. 1998)

Integrated Antennas for Millimetre-Wave Asset Tracking
Van Atta array antenna, mm-wave application, asset tracking, TLY-5
VIEW ARTICLE (NO DATE)

Automotive

PTFE microwave substrates for automotive applications
RF-35, TacPreg, TLY, TacLam PLUS, automotive radar, engine management system, tyre pressure monitoring system
VIEW ARTICLE

A Low Profile 77 GHz Three Beam Antenna For Automotive Radar
Automotive radar, microstrip patch antenna, TLY-5
VIEW ARTICLE

 

Coupler

Tri-Band RAT-Race coupler using resonators
TLX-8, resonator, rat-race coupler, tri-band, shaped structure
VIEW ARTICLE

Multiband Pi-shaped Structure with Resonators for Tri-band Wilkinson Power Divider and Tri-band Rat-Race Coupler
TLX-8; 1 GHz, 1.5 GHz, 2.5 GHz, multiband, Pi-shaped structure, resonator, Wilkinson power divider, rat-race coupler
VIEW ARTICLE

Complex Compensation of Coupled Line Structures in Inhomogeneous Media
RF-60A, coupler
VIEW ARTICLE

Inductively compensated parallel coupled microstrip lines
RF-35, RF-60, coupled-line resonator, Marchand balun, microstrip, parallel coupled filter, parallel coupled lines
VIEW ARTICLE

 

E-band Radio

Antenna-in-Package using pcb and IPD Technologies for 60 GHz Applications
TacLamPLUS, 60 GHz, antenna-in-package
VIEW ARTICLE

Low insertion loss substrate integrated waveguide quasi-elliptic filters for V-band wireless personal area network applications
TacLamPLUS, SIW filter, personal area network, V band, 60GHz
VIEW ARTICLE

Low cost high gain antenna arrays for 60 GHz millimetre wave identification (MMID)
TacLamPLUS, MMID module, highgain antenna array, 60GHz
VIEW ARTICLE

New Low-Loss Laser Ablatable Substrate for Microwave Circuits
TacLamPLUS, mm Wave, module, MMIC, laser via
VIEW ARTICLE

Novel Module Architectures up to 50 GHz - SMT and RF-Boards
TLE-95, TacLam Plus, RF and millimeter wave modules, SMT packages, PROKOSMOS project
VIEW ARTICLE

Thin Dielectrics in PWB Techniques and its Possibilities for DCA and HDA
Multilayer, buried chips, offset printing, TacLam
VIEW ARTICLE

Environmental

Environmental Aspects of PTFE Based Laminates in Relation to "Halogen-Free"
PTFE laminate, halogen-free, fluorine
VIEW ARTICLE

Filter

Analysis and Design of Dual Band-Notched Interdigital Hairpin UWB Bandpass Filter
TLX-8; class AB power amplifier; dual-band; GaN HEMT; matching network; resonator
VIEW ARTICLE

Transmission zeros origin and behaviour in a Microwave Transversal Filter based on Planar Technology
RF-60A, bandpass transversal filter,
VIEW ARTICLE

Novel Compact Narrow-band Microstrip Dual-mode Resonator Filters for G3 Communication Systems
TLC-32, microstrip resonator, bandpass filter, UMTS,
VIEW ARTICLE

 

Measuring Dielectric Properties/Laminate Characterization

Measuring Dielectric Properties and Surface Resistance of microwave PCBs in the K-band
TLY-5A, TLC-32, DK, dielectric constant (ε), df, loss tangent (tanδ), temperature dependance, -50°C to +70°C
VIEW ARTICLE

The Anisotropy of Dielectric Constant in TLY-5A Material
anisotropy, woven fiberglass, PTFE, Dielectric Constant, Er, TLY-5A, Bereskin
VIEW ARTICLE

The Impact of Conductor Surface Profile (Rrms) on Total Circuit Attenuation in Microstrip and Stripline Transmission Lines
Rrms, ED copper, RA copper, reverse treated copper, microstrip, stripline, conductor loss
VIEW ARTICLE

Effects of Surface Finish on HF Signal Loss Using Various Substrate Materials
Organic Solderability Preservative (OSP), Hot Air Solder Levelling (HASL), Electroless Nickel/Immersion Gold (ENIG), and Immersion Silver on ceramid filled and unfilled woven glass PTFE laminates, and FR4
VIEW ARTICLE

High Frequency Test Methods
1 MHz 2-fluid-cell test method, microstrip testing, "Bereskin" stripline test, full sheet resonance test method, X-band stripline resonator, modified stripline test, waveguide perturbation test method
VIEW ARTICLE

The Use of PTFE Base Materials
Processing, multilayer, PTFE/woven Glass base materials vs. thermoset resin/woven glass base materials
VIEW ARTICLE

Der Einsatz von Basismaterial aus PTFE
(the German original of the above)
VIEW ARTICLE

Cost-effective microwave solutions - also suitable for HDI
An overview of microwave sensor products leads to the availability and processability of PTFE base materials. Hybrid (= mixed dielectric) multilayers are discussed. And the concept of TacLam, a controlled thickness, low-loss material for HDI is presented. 
VIEW ARTICLE

Multilayer/RF Digital

Strategies for Designing Microwave Multilayer Printed Circuit Boards Using Stripline Structures
TSM-DS, fastrise27, TSM-30, RF-35A2, stripline, pad registration, dimensional stability, impedance fluctuation, fusion bonding, thermal ageing, z-axis expansion, reliability, Young's modulus
VIEW ARTICLE

Trends in RF/Microwave & High Speed Digital and their effect on PCB Technology Requirements
TSM-30, fastrise
VIEW ARTICLE

ATE Interconnect Performance to 43 Gbps Using Advanced PCB Materials
fastRiseTM, ATE PCBs, low loss, high frequency, mmWave applications, fiberglass free prepreg
VIEW ARTICLE

Multilayer Lamination Methods for PTFE-Based PCBs
PTFE multilayer lamination, rf, digital, single lamination, sequential lamination, fusion bonding, CTFE, FEP, thermoset prepregs, TacPreg, TacBond HT1.5
VIEW ARTICLE

Microwave Multilayer PCBs
microwave multilayer, RF-35, TacPreg, TacBond HT1.5
VIEW ARTICLE

Hybrid Multilayer
Possible constructions, base material selection, multilayer manufacture (generation of inner layers, lamination, drilling, desmearing, through-hole plating, outer layer generation, finishing, routing)
VIEW ARTICLE

Hybrid-Multilayer
(the German original of the above)
VIEW ARTICLE

Numerical Investigation of Vertical Contactless Transitions for RF Circuits
This paper presents some concepts for contactless transitions between different planar transmission lines. These types of transitions are important for use in e.g. multi layer designs. Another important reason to avoid galvanic connections at RF is that they may generate passive intermodulation products (PIM), which can be a serious problem in multifrequency systems. The investigated transitions operate in the extended GSM 900 band (880-960) MHz.
VIEW ARTICLE

Oscillators

Antiphase Design for Balanced Oscillators
TLX-0, oscillator, MMIC
VIEW ARTICLE

Passive Intermodulation (PIM)

Current Progress in Phenomenology and Experimental Characterisation of Passive Intermodulation in Printed Circuits
passive intermodulation, PIM, base station antenna
VIEW ARTICLE

Distributed Sources of Passive Intermodulation on Printed Lines
TLX-9, passive intermodulation, PIM, base station antenna, copper foil
VIEW ARTICLE

Self-Induced Instability of passive intermodulation in microwave laminates
RF-30, passive intermodulation, PIM, base station antenna
VIEW ARTICLE

Effects of interface conditions and long-term stability of passive intermodulation response in printed lines
TLX-8, TLX-9, RF-30, passive intermodulation, PIM, long-term stability, base station antenna
VIEW ARTICLE

Passive intermodulation in printed lines: effects of trace dimensions and substrate
microstrip lines, passive intermodulation (PIM), forward PIM, reverse PIM
VIEW ARTICLE

Experimental Observations of Distributed Nonlinearity in Printed Lines
PTFE laminate, pcb nonlinearity, passive intermodulation (PIM)
VIEW ARTICLE

Mapping of Passive Intermodulation Products on Microstrip Lines
RF-30, microstrip lines, near field probing, nonlinearities, passive intermodulation (PIM)
VIEW ARTICLE

Passive Intermodulation in Finite Lengths of Printed Microstrip Lines
RF-30, distributed nonlinearity, intermodulation distortion, passive intermodulation (PIM), printed circuits
VIEW ARTICLE

Passive Intermodulation Generation on Printed Lines: Near-Field Probing and Observations
TLX-9, four-wave mixing, near-field probing, passive intermodulation (PIM), printed circuit board (pcb) material characterization, printed circuits
VIEW ARTICLE

Transmission/Reflection Measurement and Near-Field Mapping Techniques for Passive Intermodulation Characterisation of Printed Lines
RF-30, PIM, soldered microstrip launchers, contactless microstrip launchers
VIEW ARTICLE

Discrimination of Passive Intermodulation Sources on Microstrip Lines
TLX-9, RF-30, forward PIM
VIEW ARTICLE

Effect of Laminate Properties on Passive Intermodulation Generation
Passive intermodulation (PIM), forward PIM, reverse PIM
VIEW ARTICLE

Passive Intermodulation on Microstrip Lines
Passive intermodulation (PIM), forward PIM, reverse PIM
VIEW ARTICLE

Radio Links

RF Radio Links and LMDS Communications - Module Technology, Status and Trends
T/R module, RF radio link, mixed dielectric multilayer, PTFE base material, LMDS communication, packaging
VIEW ARTICLE

 

RFID

UWB Channel Sounding for Ranging and Positioning in Passive UHF RFID
RF-30, passive UHF RFID, tag antenna, reader antenna, 900 MHz
VIEW ARTICLE

Semiconductors & PTFE

GHz Flip Chip - An Overview
TLY, GHz flip chip assembly
VIEW ARTICLE

Wave Guide

Compact Folded Substrate Integrated Waveguide Cavities and Bandpass Filter
TSM-30, TPN-30, multilayer, 8 GHz bandpass filter, folded substrate integrated waveguide (FSIW) cavity
VIEW ARTICLE

Negative index media in microwave waveguide
RF-35, X-Band, microwave waveguide, negative index media, NIM
VIEW ARTICLE

Wearable Antenna

Using EBG to improve antenna efficiency in proximity to the human body
RF-35, CER-10, 2.45 GHz patch antenna, ERG, human wearable antenna, WBAN
VIEW ARTICLE

Improving wearable slot antenna performance with EBG structures
RF-35, CER-10, 2.8GHz slot antenna, EBG (Electromagnetic Band Gap) substrate, WBAN
VIEW ARTICLE

The κ and μ Distribution Applied to the Analysis of Fading in Body to Body Communication Channels for Fire and Rescue Personnel
TLY-3, wireless bodyworn antennas, bodyworn channel, κ-μ distribution, wireless personal area networks, WBAN
VIEW ARTICLE

The Performance of On-Body Wearable Antennas in a Repeatable Multipath Environment
TLY-3, 2.45 GHz, wearable antenna, WBAN, on-body channels, multipath fading, Higher Mode Microstrip Patch Antenna (HMMPA)
VIEW ARTICLE

Compact slot-loaded patch antenna for 868 MHz Wireless Body Area Networks
TLY, ISM band, wireless body area network, WBAN, slot-loaded antenna
VIEW ARTICLE

In Situ Measurement of UHF Wearable Antenna Radiation Efficiency Using a Reverberation Chamber
TLY-3, 2.45 GHz, bodyworn antenna, on-body communication, wearable antenna radiation efficiency, WBAN
VIEW ARTICLE

Low-Profile Patch Antennas for Over-Body-Surface Communication at 2.45 GHz
TLY-3, RF-60A, body surface communication, shorted microstrip patch antenna (S-MPA), higher mode microstrip patch antenna (HM-MPA), 2.45 GHz
VIEW ARTICLE

Antennas and Propagation Considerations for Robust Wireless Communications in Medical Body Area Networks
TLY-3, RF-60A, wearable antennas, radio propagation, wireless networking, channel characterisation, 2.45 GHz
VIEW ARTICLE

Low-Profile Patch Antennas for Over-Body-Surface Communication at 2.45 GHz
TLY-3, RF-60A, body surface communication, shorted microstrip patch antenna (S-MPA), higher mode microstrip patch antenna (HM-MPA), 2.45 GHz
VIEW ARTICLE