Abstract
In this paper, a design of a miniaturized branch-line directional coupler is presented. The coupler is designed with balanced coupled-line sections, which are electrically shortened by the application of lumped capacitors. To measure the parameters of the coupler, appropriate baluns have been designed. The coupler has been designed in a GaAs PH25 UMS (united monolithic semiconductor) technology with the center frequency of 24 GHz. The measured power split equals 3 dB with the transmission/coupling imbalance not exceeding 0.6 dB. The measured return losses equal 17 dB at the center frequency, whereas the isolation reaches 17 dB. The fabricated coupler‘s size equals 630 um × 487 um, which is 0.19 of the full size of the directional coupler in the chosen technology (1191 um × 1170 um).
Highlights
Directional couplers are well-known components in microwave electronics [1,2,3,4]
Single-ended devices are designed in microstrip, stripline, or monolithic technology [1,3], but, recently, an approach has started to develop in which such couplers are designed as balanced ones, with differentially excited ports [5,6,7,8,9,10]
We present a differentially fed branch line directional coupler fabricated using monolithic technology
Summary
Directional couplers are well-known components in microwave electronics [1,2,3,4]. Coupled-line couplers are attractive due to their relatively small size, but they are difficult to design in microwave monolithic integrated circuit (MMIC). Branch-line directional couplers can be utilized as easy-to-design components, with the disadvantages of a limited bandwidth and large size. We present a differentially fed branch line directional coupler fabricated using monolithic technology. The proposed coupler’s realization is notin limited the chosen technology can be translated to other technologies whichtosimilar trace technology and can be translated to other technologies in which similar trace geometries and geometries and integrated capacitors can be fabricated.
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