Title :
Theoretical and experimental investigations of a bilevel `Lange´ coupler
Author :
Sachse, Krzysztof ; Sawicki, Andrzej ; Jaworski, Grzegorz
Author_Institution :
Inst. of Telecommun. & Acoust., Wroclaw Univ. of Technol., Poland
Abstract :
An interdigitated coupler in which two pairs of strips are placed on both sides of a thin dielectric layer, connected to a main substrate, is theoretically and experimentally investigated. Frequency-dependent parameters of a 3 dB coupler are calculated as a function of thickness of the thin dielectric. An optimum thickness giving a very good matching and high directivity of the coupler, is revealed. Parasitic resonances, appearing in vicinity of 2× centre frequency of the coupler, strongly deteriorating coupler performance, are efficiently suppressed using an additional planar bonding. Measured coupler characteristics are also given
Keywords :
dielectric thin films; microstrip directional couplers; resonance; 3 dB coupler; bilevel Lange coupler; coupler characteristics; frequency-dependent parameters; high directivity; interdigitated coupler; matching; optimum thickness; parasitic resonances suppression; planar bonding; thin dielectric layer; Bonding; Coupling circuits; Dielectric measurements; Dielectric substrates; Frequency; Laminates; Resonance; Strips; Voltage; Wires;
Conference_Titel :
Microwaves and Radar, 1998. MIKON '98., 12th International Conference on
Conference_Location :
Krakow
Print_ISBN :
83-906662-0-0
DOI :
10.1109/MIKON.1998.737914
