The modified cross-coupled spiral resonators with Hilbert configuration are introduced for a large coupling coefficient in this article. For comparison, the conventional cross-coupled spiral resonators are fabricated and measured herein. To obtain low insertion loss (Ϫ0.27 dB), high out-of-band rejection level (Ϫ19.5 dB) and wider FBW (50.9%), the filter of simplified CCSR-H is proposed. Results included surface current distribution and frequency responses are presented and discussed. ABSTRACT: A simple method of optical generation millimeter-wave signal employing optical phase modulator and band-elimination filter isproposed. This simple approach is capable of generating millimeter wave signal of quadrupled or sextuple microwave source frequency with extremely high spectral purity. or 39 GHz (sextuple fundamental) is obtained respectively using different system chromatic dispersion when the microwave driver signal is at 6.5 GHz.

geometric and physical parameters of novel antenna design has been carried out. A calculated value of the space resolving capacity of the optimized antenna-probe has been confirmed experimentally as a consequence of the analysis of radio-pictures of two thin dielectric threads imbedded in the polystyrene matrix. A resolving capacity enhancement of the novel probe in comparison with the well-known analogues, as well as a decrease of distortions introduced by this probe in the testing near-field seems to be very attractive for investigations of amplitude, phase, and polarization characteristics of EM near-fields. Some advantages of the novel antenna-probe design have been demonstrated by model experiments on the interaction of EM waves with artificial dielectrics in a short part of millimeter wavelength range. A permittivity of the local inhomogeneity that differs from the matrix permittivity in 0.2 has been determined. There is every reason to believe that the developed approach will be also effective for the similar problem solutions in the microwave range. 2. S. Bakhtiari, S.

The modified configurations of maximally flat parallel‐coupled lines (MF‐PCL) structure are introduced to improve the performance of the conventional MF‐PCL resonator. To obtain a higher rejection (−39 dB), symmetry response, wider band (BW about 32%), and less insertion loss (−0.4 dB) filters at central frequency 5.78 GHz, the modified MF‐PCL resonators by using enhanced coupling techniques are proposed herein. The size reduction of 50% is achieved. Results including surface current distributions and frequency responses are presented and discussed. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 902–906, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23243