论文信息 - Elimination of beam squint in uniformly excited serially fed antenna arrays using negative group delay circuits

Elimination of beam squint in uniformly excited serially fed antenna arrays using negative group delay circuits

A new design for a serially fed antenna array employing a negative group delay (NGD) circuit is reported in this paper. The NGD is generated within the feed line using an amplifier and a T-junction power divider. Therefore, the positive group delay caused by the interconnecting transmission lines between the adjacent antennas is canceled. This provides a constant phase shift over the entire antenna bandwidth, eliminating beam squint. Phase variation improvement of 83% within a bandwidth of 200 MHz at a center frequency of 10 GHz has been achieved.

A. Mortazawi | A. Mortazawi | W. Alomar | W. Alomar

[1] J. Neufeld. Wave propagation and group velocity in absorbing media , 1969 .

[2] Mo Mojahedi,et al. Removal of beam squint in series fed array antennas using abnormal group delay phase shifters , 2010, 2010 IEEE Antennas and Propagation Society International Symposium.

[3] Lotfollah Shafai,et al. Compensated circuit with characteristics of lossless double negative materials and its application to array antennas , 2007 .

[4] Nicholas Chako,et al. Wave propagation and group velocity , 1960 .

[5] T. Metzler. Microstrip series arrays , 1981 .

[6] David M. Pozar,et al. Comparison of three series fed microstrip array geometries , 1993, Proceedings of IEEE Antennas and Propagation Society International Symposium.

[7] A. Perennec,et al. Synthesis of Broadband Negative Group Delay Active Circuits , 2007, 2007 IEEE/MTT-S International Microwave Symposium.

[8] G.V. Eleftheriades,et al. A Metamaterial Series-Fed Linear Dipole Array with Reduced Beam Squinting , 2006, 2006 IEEE Antennas and Propagation Society International Symposium.

[9] John Litva,et al. Theoretical and experimental study of feed network effects on the radiation pattern of series-fed microstrip antenna arrays , 1991 .

[10] George V. Eleftheriades,et al. Periodically loaded transmission line with effective negative refractive index and negative group velocity , 2003 .