A New Broadband Antenna of High Gain: The Double-Cornu Spiral Antenna

Abstract

A new planar compact antenna composed of two crossed Cornu spirals is presented. Each Cornu spiral is fed from the center of the linearly part of the curvature between the two spirals, which builds the clothoid. Sequential rotation is applied using a sequential phase network to obtain circular polarization and increase the effective bandwidth. Signal integrity issues have been addressed and designed to ensure high quality of signal propagation. As a result, the antenna shows good radiation characteristics in the bandwidth of interest. Compared to antennas of the same size in the literature, it is broadband and of high gain. Although the proposed antenna has been designed for K-and Ka-band operations, it can also be developed for lower and upper frequencies because of the linearity of the Maxwell equations.

An Array of Double-Cornu Spiral Antenna

“…The discrepancies observed around 22 GHz are due to the fabrication tolerances regarding the connector soldering. Furthermore, it was observed that the connector-fed array exhibits a broadened AR about 1 GHz compared to the AR of the fabricated single DCSA [1]. However, it is worth mentioning that the 3-dB bandwidth of the array of DCSA at the broadside and all azimuth angles is very similar to that of the single DCSA [1].…”

“…The designed antenna according to Fig. 3 an in-house made far-field antenna measurement system consisting of a full-anechoic chamber operating from 3 to 80 GHz, a linearly polarized standard gain horn antenna, with a constant gain of 13 dB from 17 to 34 GHz, and a network analyzer (RαS ZNB) [1]. The measurement step was 50.0 MHz for frequencies and 5 • for the elevation angle.…”

“…2(a)) uses the feed of the single DCSA as the essential building block of the array feed. Recall that the DCSA is fed using an integrated wideband stripline sequential phase power network (SPPN) as described in [1]. Four SPPNs are arranged under the area of radiating elements to efficiently utilize the space allocated to the feed design.…”

“…I n a recent publication, a new family of planar spiral antennas composed of two Cornu-Spirals rotated by an angle of ±π/2 about the axis perpendicular to the antenna plane was presented [1]. A sequential rotation technique was applied to obtain circular polarization.…”

“…The array uses the DSCA as a single element; therefore, details on the design of the DSCA will not be reproduced here in order not to inflate the work unnecessarily. Readers seeking the design procedure of the DCSA are referred to [1]. However, proper due is given to manufacturing requirements [6] for production purposes during the design of each antenna array as for the DCSA.…”