This paper presents the design and optimization of a dual-band polarization-dependent metasurface capable dynamically switching transmission reflection characteristics. The is composed three metallic patterns, with bottom layer governing phase for both TE-polarization TM-polarization states. middle top layers are strategically employed to ensure optimal performance. results confirm that enables...

As wireless communication moves to all IP and packet based processing, the virtualization techniques will need to be introduced to provide common interface to higher layers which will hide the necessary details for resource reservations and sharing. In the circuit switched world the communication resources are guarantied with the allocation of channels that satisfy certain bandwidth requirement...

An automatically switched optical network (ASON) can be used as the transport layer of generalized multiprotocol label switching (GMPLS) networks. The design of an ASON involves determining the number of optical cross-connects (OXC) in the network, the required number of ports per OXC, and the interconnection topology of the OXCs. Given the number of ports per OXC, we present a linear algorithm...

We experimentally demonstrate control over the group delay of narrow-band (quasi continuous wave) terahertz (THz) pulses with constant amplitude based on optical switching of a metasurface characteristic. The near-field coupling between resonant modes of a complementary split ring resonator pair and a rectangular slit show an electromagnetically induced transparency-like (EIT-like) spectral sha...

To overcome the limitations of traditional frequency selective surfaces in flexible state switching at same frequency, this paper proposes a novel active surface (AFSS) that simultaneously exhibits conversion between absorption and transmission modes band. By welding PIN diodes on bottom structure AFSS, band-pass (transmission) band-stop (absorption) filters can be controlled electronically. In...

A reconfigurable rotated-T slot antenna for cognitive radio operation in the lower part (3.1–6GHz) of the UWB frequency range is presented. The antenna can operate one at a time at six adjacent sub-bands. The switching from one sub-band to another is done electronically using PIN diodes. The antenna exhibits a nearly omnidirectional radiation pattern in the horizontal plane of operation with pr...

(ABSTRACT) As traditional control schemes, open-loop Hysteresis and closed-loop pulse-width-modulation (PWM) have been used for the switched reluctance motor (SRM) current controller. The Hysteresis controller induces large unpleasant audible noises because it needs to vary the switching frequency to maintain constant Hysteresis current band. In contract, the PWM controller is very quiet but di...

At 14:30 I will give a short introduction to my thesis You are most welcome to attend the introduction, the defense and the reception afterwards. Abstract Tunable on-chip Radio Frequency (RF) filtering is highly desirable for cost effective wireless communication devices. As mobile wireless devices increasingly support multiple RF-bands, tunable RF filtering is wanted. The tremendous growth of ...

The microwave wireless power transfer (MWPT) technology has found a variety of applications in consumer electronics, medical implants and sensor networks. Here, instead magnetic resonant coupling (MRCWPT) system, novel MWPT system based on frequency reconfigurable (covering the S-band C-band) microstrip patch antenna array is proposed for first time. By switching bias voltage-dependent capacita...