MULTI-MODE ANALYSIS OF A TWO COAXIAL CUP PRIME FOCUS FEED WITH AN INFINITE FLANGE

1989 ◽  
Vol 9 (3) ◽  
pp. 281-311
Author(s):  
C. J. Papathomas ◽  
R. E. Collin
Keyword(s):  
Mode Analysis ◽  
Infinite Flange ◽  
Multi Mode

A multi-mode resonator-based UWB bandpass filter with wide stopband

2015 ◽  
Vol 8 (7) ◽  
pp. 1031-1035 ◽  
Author(s):  
Ting Zhang ◽  
Fei Xiao ◽  
Xiaohong Tang ◽  
Lei Guo
Keyword(s):  
Return Loss ◽  
Bandpass Filter ◽  
Mode Analysis ◽  
Frequency Range ◽  
Coupled Line ◽  
Resonance Characteristic ◽  
Line Section ◽  
Multi Mode ◽  
Mode Resonator ◽  
Better Than

In this paper, a novel multi-mode resonator is presented, which is formed by cascading several open-circuited transmission line sections with a coupled-line section. Owing to its symmetry, even- and odd-mode analysis methods are applied to analyze its resonance characteristic. Based on this resonator, a microstrip ultra-wide bandwidth (UWB) bandpass filter is designed, fabricated, and measured. The simulated and measured results show that its bandwidth can cover the desired UWB. Return loss in passband is better than −14 dB. This filter is featured by good selectivity and wide stopband. Stopband suppression as low as −40 dB can be achieved within frequency range from 12 to 16 GHz.

scholarly journals Multi-mode analysis of Rayleigh-type Lg. Part 2. Application to southern California and the northwestern Sierra Nevada

1981 ◽  
Vol 71 (4) ◽  
pp. 985-1002
Author(s):  
Michel Cara ◽  
J. Bernard Minster ◽  
Ronan Le Bras
Keyword(s):  
Sierra Nevada ◽  
Southern California ◽  
Mode Conversion ◽  
Wave Train ◽  
Companion Paper ◽  
Mode Analysis ◽  
Time Frequency ◽  
Short Period ◽  
Multi Mode ◽  
Group Velocities

abstract The UC diagram technique described in the companion paper (Part 1), is applied to nine sets of Lg phases recorded through the CEDAR system in southern California, and two sets of Lg phases recorded along the northwestern margin of the Sierra Nevada. A clear image of the signal is obtained in time-frequency-wavenumber space, and we discuss in particular observations at 2.5-sec period, for events 200 to 300 km outside the profiles. From the gross features of UC diagrams we conclude that a representation of Lg as a single coherent multi-mode wave train is oversimplified in the case of southern California but is more appropriate for the Sierra block. In southern California, peaks observed at group velocities smaller than 3.2 km/sec are not predicted by realistic crustal models of the area, and are probably due to lateral heterogeneities effects such as mode conversion and multipathing. On the other hand, for group velocities between 3.2 and 3.6 km/sec, peaks observed in either area can generally be interpreted in terms of overtones excited at the source and propagating through spatially averaged structures, although care must be taken to monitor the stability of the algorithm on actual short-period records.

Shape Synthesis of Multi-mode Dielectric Resonator Antennas Using Characteristic Modes

2021 ◽  
Vol 35 (11) ◽  
pp. 1280-1281
Author(s):  
Binbin Yang ◽  
Abdullah Eroglu ◽  
Jacob Adams
Keyword(s):  
Cost Function ◽  
Dielectric Resonator ◽  
Mode Analysis ◽  
Synthesis Process ◽  
Modal Parameters ◽  
Characteristic Mode ◽  
Dielectric Resonator Antennas ◽  
Resonance Frequencies ◽  
The Cost ◽  
Multi Mode

This paper demonstrates a shape synthesis technique for multi-mode dielectric resonator antennas using binary genetic algorithm and characteristic mode analysis. The cost function for the synthesis process is defined from characteristic modal parameters, such as modal quality factors and self-resonance frequencies. Since only modal parameters are involved in the cost function, the shape synthesis process is made independent of feeds. In the paper, we demonstrate the shape synthesis of a DRA with three self-resonant modes at 3 GHz.

Dynamic multi-mode analysis of passive Q-switched lasers

2012 ◽  
Author(s):  
Christoph Pflaum ◽  
Zhabiz Rahimi ◽  
Fan Feng
Keyword(s):  
Mode Analysis ◽  
Multi Mode
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