Design of multilayer and multiline microstrip directional coupler with closed form relations

• Design, simulation, implementation and measurement results of multiline and multilayer microstrip directional couplers are given with closed form relations. Step-by-step design procedure reflecting the design practice of directional couplers, which requires only information on coupling level, port impedances and operational frequency, is presented. The method based on the synthesis technique applied in the design of conventional two-line microstrip symmetrical directional couplers is adapted to design multilayer directional couplers with the aid of electromagnetic simulators using parametric analysis with curve fitting method. The proposed design method is compared with the measurement results and accuracy is verified. It has been also shown that the directivity of the couplers designed using the multilayer structure is improved significantly. A method such as the one presented in this paper can be used to design multilayer two-line and three-line directional couplers which can be integrated to the front end of an RFID systems to provide the required isolation between transmitter and receiver and prevent signal leakage due to use of conventional circulators.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)

Nyckelord

Curve fitting

Directional couplers

Elastic moduli

Electromagnetic simulation

Multilayers

Optical waveguides

Signal receivers

Closed-form relations

Curve fitting methods

Electromagnetic simulators

Multilayer microstrip

Multilayer structures

Operational frequency

Parametric -analysis

Transmitter and receiver

Design

Intelligent industri

Intelligent Industry

Publikations- och innehållstyp

ref (ämneskategori)

art (ämneskategori)