A compact multiple band-notch ultra-wide band (UWB) band-pass filter (BPF) with surface area of 18×12 mm 2 is introduced in this article. The proposed filter is a combination of novel symmetrically tapered elliptic rings (STER) and contiguous split ring resonators (SRR), with stepped impedance resonator (SIR) structure to realize the multi-band notch UWB pass band characteristics. In the proposed structure, band-notches are generated for interfering microwave bands such as, WiMAX, WLAN and X-band applications. These notches are achieved by optimizing structural parameters of SRR sections. The proposed filter is fabricated on RT/Duroid 5880 substrate with ε r = 2.2 and thickness of 0.787 mm. The fabricated prototype is measured and a good agreement between simulated and measured results ensures suitability of the proposed filter for UWB applications.

A novel, compact and dual polarized ring Sectoral Monopole Antenna (RSMA) with defected ground is presented for Ultra Wide Band (UWB) applications. Present structure has been derived from the circular monopole antenna to accomplish dual polarization characteristics without much change in the impedance band width, radiation pattern (quasi Omnidirectional) and other antenna characteristics. Proposed RSMA with partial and defected ground design, UWB response (i.e. 3.1 GHz -10.6 GHz) with reference to VSWR<2 is achieved. The antenna is fabricated on a RT/Duroid5880 (ε r =2.2) substrate having thickness of 0.785 mm with total real-estate of 20×28 mm 2 . Measurements are in close agreement with the simulated results. Dual polarization characteristics ensure that proposed antenna can be a promising candidate for the UWB applications.

No abstract

In present work we introduce simple metal baffles for improving the gain of horn antenna. The baffle dimensions and distance from the feed are optimized without loading the feed. Performance of baffles like hemisphere, shuttle and variants of ellipse has been studied. Simulation based analysis for 20-30 GHz reveals that gain >21 dB can be achieved with a tradeoff of poor input matching at the edge frequencies. In this work parametric study is done to achieve S 11 <-10 dB and gain >20 dB with radiation pattern discussed. These proposed structures have shown good performance and are suitable for applications requiring compact and high gain horn antennas.