T. Metzler

Bio: T. Metzler is an academic researcher. The author has contributed to research in topics: Microstrip & Patch antenna. The author has an hindex of 1, co-authored 1 publications receiving 150 citations.

Microstrip series arrays

Abstract: A traveling-wave design technique for microstrip series arrays is discussed. The technique is applicable to both resonant and nonresonant array configurations. Experimental results for both configurations are presented.

Microstrip array technology

Abstract: Past and present technological developments in microstrip antenna arrays are summarized. Emphasis is on exploring the potential of such arrays for satisfying the requirements of advanced military and commercial applications.

Compact Two-Layer Rotman Lens-Fed Microstrip Antenna Array at 24 GHz

Abstract: This paper presents a new design to realize a compact Rotman lens-fed antenna array. The lens-fed antenna has the form of two layers, which is a new approach to reducing the size of the Rotman lens. The approach is demonstrated at 24 GHz aiming for an automotive sensing radar. The lens consists of a top metal layer, a dielectric, a common ground, a dielectric, and a bottom metal layer, in sequential order. The layout of the lens body is placed on the bottom layer and the antennas are placed on the top layer. Both of them are electrically connected through slot transitions. This two-layer structure reduces not only the total size of the lens, but also the loss of the delay lines because the lines can be designed to be as short and straight as possible. The two-layer Rotman lens-fed antenna array is measured in terms of scattering parameters and beam patterns. From the scattering parameters, the power efficiencies of the beam port 1, 2, and 3 at 24 GHz are obtained as 32.3%, 48.5%, and 50.8%, respectively. The measured beam patterns show that the beam directions are -28.1°, -14.9°, 0°, 15.5°, and 28.6° and the beamwidths are 13.4°, 13.2°, 12.8°, 13.5°, and 13.0°. The measurements confirm that the compact two-layer Rotman lens has been successfully demonstrated.

Series-Fed Binomial Microstrip Arrays for Extremely Low Sidelobe Level

Abstract: This communication presents linear and planar binomial arrays for extremely low sidelobe level (SLL) on a single substrate using series feed configuration. Binomial distribution is achieved using tapered patch width. A seven-element linear binomial array using U-shaped series feed is designed and compared with a conventional series-fed array having identical radiating elements. A conventional series-fed array provides a gain of 14.9 dBi and an SLL of −14.5 dB. However, the binomial array provides SLL of −28 dB with 12.5 dBi gain at 5.76 GHz. A planar series-fed binomial array is designed using series and corner feed lines in E- and H-planes, respectively. A $3\times3$ element series-fed planar binomial array is fabricated, and the measured results agree with simulated values. It provides SLL of less than −28 dB in both E- and H-planes with 12.8 dBi gain at 5.76 GHz. Both linear and planar binomial arrays provide extremely low SLL.

The synthesis of shaped patterns with series-fed microstrip patch arrays

Abstract: A method of designing series-fed microstrip patch arrays to produce a shaped pattern is described. The technique is based on a circuit representation of the patches in the array environment with experimentally determined parameters. The positions and widths of the patches are derived from the amplitudes and phases of the elements of a uniform array, which produces the desired pattern and which has the same extent as the patch array. For the array to have high efficiency, the amplitude distribution mast not be strongly peaked. An algorithm for obtaining an approximation to the desired far-field amplitude distribution while retaining control over the amplitude of excitatian is presented. Very close agreement has been obtained between calculated and measured performance of such arrays.

Millimeter wave antennas

Abstract: Major advances in millimeter-wave antennas have been made in recent years, in particular in two areas. A new class of leaky-wave antennas based on open millimeter waveguides has been proposed and investigated, and substantial progress has been achieved in integrated antennas where active and passive circuits, possibly in monolithic form, are combined with the radiating elements in one compact unit. Interesting developments have taken place also in a third group of millimeter-wave antennas, that of microstrip antennas and printed circuit antennas in general. An attempt is made to summarize these developments. >