Circular dirigida por el Ilmo. Sr. Arzobispo de México al Ilmo. y Ve. Cabildo Metropolitano, al de la insigne Colegiata de Guadalupe, al clero secular y regular y a todos sus diocesanos

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Circular diocesana expedida por el Ilmo. Sr. Obispo de Cuernavaca, con motivo de la declaración del Exmo. y Rmo. Sr. visitador apostólico acerca de la conducta que debe observar la prensa católica.

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Circular del Illmo. Sr. Obispo de Michoacán al venerable clero de su diócesis

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Dos discursos pronunciados en el Saltillo, por el Illmo. Sr. Dr. y Mtro. D. Ignacio Montes de Oca y Obregón Obispo de Linares precedidos de una circular a los párrocos de la Diócesi

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Orden circular del Illmo. Sr. Dr. Don Crescencio Carrillo y Ancona,Dignisimo Obispo titular de Lero y Coadjutor de Yucatan, publicando el jubileo extraordinario de 1886 con inserción de la encíclica que trata de la constitucion cristiana de los estados que ha motivado dicho jubileo.

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Orden circular contra la propaganda protestante, por el Illmo. Sr.Dr. Don Crescencio Carrillo y Ancona, Digmo. Obispo titular de Lero y Coadjutor de Yucatán.

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Orden circular del Ilmo. Sr. Dr. D. Crescencio Carrillo y Ancona,Dignísimo Obispo titular de Lero y coadjutor de Yucatán sobre la tercera orden de San Francisco de Asis y las conferencias de San Vicente de Paul.

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Resonant frequencies of circular-sided dual-port microstrip antenna

A dual-port microstrip antenna with a crescent shaped patch with excellent isolation betwecn the ports has been reportcd [I]. Since circular-sided geometries are inore compact than rectangular oncs, thcy find morc applications in microstrip arrays. The crcscent shaped antenna geometry [ I ] provides greater area rcductioii compared to other circular sided patches for broadband operation [2]. In this Lctter, formulac for calculating thc TM, I and TMZI mode resonant frequencies of this microstrip antenna, obtained by modifying the equations of a standard circular patch [3] are presentcd. Thcorctical results are compared with experimental observations aid the validity of the computation is established.

Modified Circular Patch Antenna

A circular miqrostrip antenna with a modified structure is presented. By adjusting the feed location along the circumference of the patch it is possible to match the antenna with a C microstrip line of any impedance. The impedance bandwidth and radiation characteristics are unaffected by this structural V modification.

A new broadband circular patch antenna

A simple technique to improve the impedance bandwidth of a circular microstrip patch antenna using two sectorial slots is proposed. Using this design more than 5% impedance bandwidth is obtained. The added advantage of this new antenna is that it can be fed by a 50- microstrip line

A Variational Calculation of TE and TM Cutoff Wavenumbers in Circular Eccentric Guides by Conformal Mapping

The cutoff wavenumbers of higher order modes in circular eccentric guides are computed with the variational analysis combined with a conformal mapping. A conformal mapping is applied to the variational formulation, and the variational equation is solved by the finite-element method. Numerical results for TE and TM cutoff wavenumbers are presented for different distances between the centers and ratio of the radii. Comparisons with numerical results found in the literature validate the presented method

Compact Circular- Sided Microstrip Antenna for Circular Polarization

Development of a new compact circular-sided microstrip antenna is presented. This antenna offers considerable area re- TABLE 2. Variation of Resonant Frequencies duction compared to standard rectangular microstrip antenna designed for the same frequency. Typical antenna design and experimental results for circular polarization are also demonstrated. 77je antenna has a 3-dB axial ratio bandwidth of 1.5%

A New Broadband Circular Patch Antenna

A simple technique to improve the impedance bandwidth of a circular microstrip patch antenna using two sectorial slots is proposed. Using this design more than 5% impedance bandwidth is obtained. The added advantage of this new antenna is that it can be fed by a 50 microstrip line.