Abstract
Laser-direct writing has become an alternative method to fabricate microwave devices. We present a laser-scribed wideband open-end termination that relies on conductor loss of the microstrip line structure to obtain effective absorption. The proposed design consists of a resistive film overlapped on a strip conductor, providing an enlarged sheet-resistance range (20 Ω/□~1.2 kΩ/□) of the resistive film to reduce the fabrication difficulties. The resistive film is in tapered shape to enable small gradual changes in impedance, yielding minimized reflections (|S11|). The prototype is demonstrated utilizing the laser-direct writing technique, with a measured |S11| over −15 dB from 6 GHz to at least 30 GHz. The termination can also be used for attenuation over a −10 dB attenuation level (>8.5 GHz) with a low reflection level better than −15 dB (>2.0 GHz). This study can be employed for the applications where cheap wideband planar terminations are needed and promote fast, flexible, and low-cost prototyping or modification of the existing microwave circuits.
Highlights
Terminations are single-port devices with high absorption and minimized reflection of the input signal, which provide a variety of applications such as attenuation, isolation, measurement calibration, power divider, and multi ports network for measurement instruments and microwave systems
On the other hand, adding resistive film typically enlarges the imaginary part of the impendence in several magnitudes and leads to a decrease in the real part
The resistive film is regulated to a trapezoid shape with its width which is consistent with that (w1 ) of the strip conductor at the input end and gradually widens to w2 at the other end
Summary
Terminations are single-port devices with high absorption and minimized reflection of the input signal, which provide a variety of applications such as attenuation, isolation, measurement calibration, power divider, and multi ports network for measurement instruments and microwave systems. A planar termination commonly uses a chip resistor or a sheet resistor in series with a short end [1,2,3,4,5]. This configuration shows a low-pass response due to the series parasitic inductance of the short end. Open-end configurations consist of lossy transmission lines to gradually attenuate the microwave power [6,7,8]. The response demonstrates a high-pass characteristic, which is fit for high-frequency broadband networks
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