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Nakkeeran, R.
- Ring Resonator Based Compact Bandpass Filters for UWB Applications
Authors
Source
Wireless Communication, Vol 2, No 10 (2010), Pagination: 376-379Abstract
In this paper novel microstrip ring resonator based compact Ultra-Wideband (UWB) bandpass filters using different coupling structures are presented. The proposed filters are designed to provide a wide passband, low insertion loss and return loss, linear phase over the passband, flat group delay and high fractional bandwidth. The simulation of bandpass filter (BPF1) with interdigital coupling results a passband of 7.4 GHz over 2.2–10.5 GHz, minimum insertion loss of approximately -2 dB, return loss of around -40 dB and – 10 dB fractional bandwidth of 120 % while for the filter (BPF 2) with dual line coupling, they are 7 GHz over 3-14 GHz, -0.09 dB, -33 dB and 127.27 % respectively. The computed group delay variation in the passband for BPF1 is 0.2 ns while for BPF2 0.03 ns. The overall dimensions of the filters are 38 mm (length) × 3.2 mm (height) ×3.175 mm (breadth) and 16.5 mm (length) × 2.5 mm (height) × 1.6 mm (breadth) respectively. They are simulated using electromagnetic (EM) simulator, IE3D.Keywords
Ultra-Wideband, Ring Resonator, Microstrip Coupling Structure, Bandpass Filters.
- A Hybrid Joint Call Admission Control Algorithm for Next Generation Network to Enhance Connection Level QOS
Authors
1 Department of Electronics and Communication Engineering, Pondicherry Engineering College, Puducherry - 605 014, IN
2 Department of Electronics and Communication Engineering, Pondicherry Engineering College, Puducherry-605 014, IN
Source
Wireless Communication, Vol 2, No 8 (2010), Pagination: 208-212Abstract
Next Generation Wireless Networks (NGWN) necessitates joint radio resource management to enhance QoS provisioning and efficient radio resource utilization. The objectives of the Joint Call Admission Control (JCAC) algorithm are to uniformly distribute the traffic load among the available Radio Access Technologies (RATs), to provide priority to handoff calls and hence to enhance connection-level QoS. The study of network has been done separately using load based and service based approaches for selecting the most appropriate radio access technologies and compared. An algorithm is proposed, hybrid JCAC, to overcome the limitations of load and service based JCAC by combining them. It manages load and service conditions efficiently. The numerical results obtained show that overall call dropping probability in heterogeneous network is reduced significantly.