2010 Indian Antenna Week: A Workshop on Advanced Antenna Technology

Explosive growth of geo-stationary communication satellites has reduced the inter satellite space. This has resulted in very tight radiation specifications for earth station antennas. Antennas with surface flaws usually do not meet these specifications. This paper provides a method of identifying flaws on the surface of a parabolic reflector which when rectified would allow these antennas to meet ... View full abstract»

Microwave tubes are used for generation and amplification of high power (up to MW of pulsed/CW output power) and high frequency (0.3GHz to 1000GHz) electromagnetic waves. These tubes are in great demands for defense, communication, remote sensing, and for numerous industrial, scientific, and medical (ISM) applications. Input and output RF couplings in microwave tubes are very significant for effic... View full abstract»

In this paper, optimal array synthesis of three-ring concentric circular antenna arrays (CCAA) without and with central element feeding are reported. For each optimal synthesis, optimal current excitation weights and optimal radii of the rings are determined having the objective of maximum Sidelobe Level (SLL) reduction. The optimization technique adopted is Particle Swarm Optimization with Constr... View full abstract»

Now-a-days there has been growing interest in dual-pol systems, especially in hybrid-pol mode. In comparison to quad-pol system, the dual-pol system has the advantage of halved average transmitted power and double swath coverage. In this paper, we have discussed, in brief, the benefits of using hybrid-pol scheme. We also present comparisons of hybrid-pol and Quad-pol data based on the amount of in... View full abstract»

Multiple Input Multiple Output (MIMO) configurations in radar systems provide architectural and performance advantage over conventional monostatic and bistatic systems due to the implicit diversity characteristics of any MIMO system. Various authors are individually addressed either of these diversities. This work aims at parameterizing all the three, spatial, frequency and waveform diversities an... View full abstract»

Miniaturization of antennas using novel magneto-dielectric substrates having permeability and permittivity values greater than one is proposed. The limitations of magneto-dielectric substrates at higher GHz frequencies and their suitable alternatives are discussed. The use of such substrates for the development of miniaturized antennas is validated by synthesis of a nickel cobalt zinc ferrite subs... View full abstract»

The preparation and microwave dielectric properties Ca[(Li1/3Nb2/3)0.8Ti0.2]O3-δceramic filled polymer composites for microwave substrate applications is discussed in this paper. The prediction of the dielectric properties of polymer-ceramic composites using different theoretical models is also discussed. A Coplanar Waveguide Monopole Antenna ... View full abstract»

This paper presents a CPW-fed antenna for wideband application. This Antenna satisfies the licensed frequency band of wireless communication and covers WLAN (5.15-5.85)GHz application for h= 0.5mm having return loss lower than -10 dB. This antenna is designed on a substrate with dielectric constant εr=4.4. With a size 27.5mm×28mm×0.5mm the antenna operates for wideband application. The ... View full abstract»

This paper presents a compact novel CPW-fed reconfigurable antenna for two different applications. This Antenna satisfies the licensed frequency band for RFID and C-Band having return loss lower than -10 dB. The antenna is designed on a substrate with dielectric constant εr=4.4. With two different ON and OFF states the antenna can be used for different applications. The effects of shape... View full abstract»

A compact ultrawideband monopole antenna having dual band-notched characteristics with a defected ground structure (DGS) proposed. Two symmetrical L-shaped slots are created on the ground plane to generate the UWB characteristics in the proposed antenna. To generate the notch at 5.2/5.8 GHz band, a U-shaped slot is cut in the rectangular radiating element, which mitigate the potential interference... View full abstract»

A planar ultrawideband (UWB) antenna with an U-shaped slot for a 5/6 GHz band notched characteristics is presented. The antenna is a planar structure and has a compact area of 25 × 25 mm2, which covers the frequency band from 3.1 GHz to 10.6 GHz (VSWR ≤ 2 ). The antenna has a circular slot cut in the ground plane and a circular patch is printed within that. A 50-Ω coplanar waveguide (CP... View full abstract»

This paper introduces a novel E-shape microstrip patch antenna for multi-band and multi-polarization facility using single layer structure. This E-shape antenna operates at three sub-bands, namely 5.75, 13.5 and 19.4 GHz with 20%, 70%, and 10% bandwidths respectively. By using only single patch a high impedance bandwidth is achieved. The proposed antenna has simple structure consisting E-shape on ... View full abstract»

A multi-band patch antenna on complementary conjugate omega ground is proposed. The proposed antenna utilizes complementary conjugate omega resonator (CCOR) in the ground plane altering the effective medium parameters of the substrate. The antenna features a multi frequency behavior (four operating bands) with similar gain. To characterize the performance of the CCOR loaded microstrip antenna, the... View full abstract»

3 element planner antenna arrays with uniform and non-uniform spacing are compared. The non-uniform spacing uses the Golden Ratio. Simulated and experimental results are presented. View full abstract»