Avalanche Photodiode based on InGaAs/InP was chosen because of the needs of high-speed optical receivers and have their own advantages on high sensitivity. In this project, we focused on the effect of guard ring on InGaAs/InP avalanche photodiodes and its performance. Two types of guard ring structures are designed in APD and their current-voltage (I-V) characteristics (electric field profiles) are simulated and analysed. This paper investigates the effects of guard-ring (GR) structures on the performance of InGaAs/InP avalanche photodiodes (APDs). Two type InGaAs/InP-APDs based on P+/N-well guard ring and n+/p-substrate guard ring are designed and their electric field profiles are simulated and analyzed. Current current-voltage characteristics (I-V characteristics) are measured and compared.
Microwave filter is a kind of device, which can separate microwave signals with different frequencies. The filter has been utilized widely in many fields such as communication, signal processing, radar and other related fields. An X-band filter using parallel coupled-line technique with DGS is designed. The purpose of this paper is to observe the performance of band-pass filter with defected ground structure operating at a frequency of 10G Hz. The filter designed is run by simulation using Advanced Design System (ADS). Initially, the mid-band frequency is set to 10G Hz. The filter's design and structure is based on the Chebyshev prototype characteristic. The characteristics can be visualized through the response of the reflection coefficient and transmission coefficient.
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