Latheef A. Shaik

Ultra-Wideband Antipodal Tapered Slot Antenna With Integrated Frequency-Notch Characteristics

This communication presents the design of an ultra-wideband antipodal tapered slot antenna (ATSA) with frequency notch characteristics. Subwavelength resonators in the form of square split-ring resonators are placed on the aperture as well as on the feed section of the ATSA to invoke the frequency notches. The electromagnetic coupling of the SRRs with the radiating aperture and with the magnetic fields due to the fringing at the microstrip line feed yields the frequency notches. The invoked notches are sharp in comparison with previously reported designs. The fabricated prototypes were experimentally verified through measurements, and a good agreement with simulations was obtained. The impedance and radiation plots confirm the suppression of the desired notch frequency. A theoretical formulation to calculate the notch frequency is also proposed and validated.

Design of a reconfigurable dual state planar filter using SRRs and MEMS on a coplanar waveguide

Design of a reconfigurable dual state planar filter configured using MEMS switch is proposed in this paper. The design consists of a coplanar waveguide loaded with SRRs and integrated with MEMS switch. The SRR loaded coplanar waveguide yield a notch in the transmission coefficient. However, with the actuation of the MEMS switch the filter yields a narrowband response. Su8 cantilever beam is used as a micro-switch and design guidelines are provided for the required pull in voltage for deflection of beam.

SU-8 derived novel ultra compact carbon antenna using C-MEMS technology

A carbon microelectromechanical Systems (C-MEMS) technology derived ultra-compact circular disc shaped antenna is proposed in this paper. The antenna is designed and developed on a Silicon-dioxide coated Si-substrate (Si/SiO2) using SU-8 2007 negative photoresist, with carbon replacing the conventional metallization layer of the antenna fabricated in a class 1000 clean room. The antenna has over-all dimension of 50 × 50 × 0.53 mm3 and provides a measured impedance bandwidth from 139 MHz to 3.07 GHz indicating a 182.6% impedance bandwidth. Basic design steps, fabrication technology and measured impedance characteristics of the fabricated antenna is reported in this paper.

Balanced antipodal tapered slot antenna with low cross-polarized radiation

A balanced antipodal tapered slot antenna with low cross-polarized radiation is proposed in this article. The low cross-polarization is achieved by placing a superstrate layer on the antenna acting as an additional ground plane and leading to cancellation of cross-polarized fields. The simulation results are reported here and the measured results will be presented during the conference.

Dual frequency notched coplanar tapered slot antenna using split ring resonators on modified slotline

A dual frequency notched coplanar tapered slot antenna using split ring resonators is proposed. The SRRs are placed beneath a modified slotline and excited by a microstrip to slot line transition. The proposed design concept is validated using a simulator and measured results will be presented in the conference.

UWB printed monopole antenna with controllable multi notch function using rotational circular SRRs

This work proposes a new design technique to obtain multi notch function in an UWB response of a printed monopole antenna using rotational split ring resonators(SRRs). SRRs with rotated inner rings are inductively coupled to the CPW feed of the antenna. The relative angular variation of the SRR rings control the notch functions. The design is validated using an EM simulator. Experiments are underway and measured results will be presented.

An ultra wideband (UWB) printed slotted monopole antenna with multi-functional charactersitics

This paper presents a novel design concept for a compact multifunctional coplanar waveguide (CPW)-fed UWB printed antenna. The multifunctional characteristics of UWB notched antenna and narrow band antenna are achieved by loading the split ring resonator (SRR) and the shunt strip to the feed line. This concept has been extended to the dual band configuration with the loading of superstrate layer to the feed line. The notched frequencies can be controlled by changing the physical dimensions of SRR and are independent of the antenna configuration. The simulated responses have been presented to validate the concept. Experiments are underway and measured results will be presented.

CPW fed Dielectric Resonator Antenna with complementary characteristics

This paper proposes a new coplanar waveguide (CPW) fed Dielectric Resonator Antenna (DRA) with complementary characteristics. It is shown that an ultrawideband DRA can be operated as a narrow band antenna as well as a frequency notched wideband antenna by using a combinatorial loading of split ring resonators (SRR) and shunt strip between signal line and ground planes of the feeding CPW line. Using the SRRs alone yield a frequency notch in the wideband response whereas the combination of SRRs and shorting strips provides a narrowband response. Different configurations are designed and their simulated results are presented as a proof of concept.

Design of a frequency notched coplanar tapered slot antenna using split ring resonator

This paper presents the design of a compact split ring resonator (SRR) loaded microstrip fed coplanar tapered slot antenna having frequency notch characteristics. The electromagnetic coupling of the SRR with the microstrip transmission line yields the frequency notch in the antenna bandwidth. Proposed concept can be used to change the notch frequency without affecting the radiation characteristics of the antenna. This proposed structure is simulated using finite element based EM simulator HFSS v15.

Enhancement of isolation in printed MIMO antenna using multiple EBG elements

This paper presents a new isolation enhancement technique between multiple antenna elements for MIMO antenna systems. The isolation technique is based on multiple electromagnetic band gap (EBG) cells loaded in the feed region of the two antennas. Proposed technique of isolation enhancement is highly compact as it does not impact the over-all antenna size and is exhibited in UWB-Narrow band antenna pair hosted on the same substrate. Apart from the antenna impedance and radiation characterization, envelope correlation co-efficient and diversity gain of the system is studied, revealing excellent results. The obtained isolation between the two antenna elements is better than 30 dB over the entire TJWB spectrum. Proposed isolation enhancement technique is radiator independent and can be used for other printed MIMO antennas also.