A printed leaky‐wave antenna with stable gain and reduced cross‐polarization level is presented in this letter. The proposed antenna has the property of continuous backward‐to‐forward beam scanning with symmetrical scanning. The proposed antenna's unit cell consists of two unequal inclined stubs connected to a microstrip line. The angle between the stubs and their dimensions is designed optimally to obtain improved antenna performance. The antenna provides stable gain with peak gain 14.4 dBi and gain variation 2.55 dBi in the operating band 9.5–15 GHz. The maximum value of cross‐polarization level along the main beam is −30 dB. The design gives a scanning angle of 73° from −36° to +37° through broadside. Another important feature of the proposed antenna is that there is no gain reduction at the broadside radiation.

Printed leaky‐wave antenna with stable gain and reduced cross polarization

Symmetric periodic leaky-wave antenna for open stopband suppression

In this work, a meandering line fed-patch periodic-leaky wave antenna (P-LWA) is designed to achieve broadside beam scanning and consistent gain response. The meandering line is provided a vertical offset (s) away from the longitudinal axis of the unit cell (UC). The combine effect of meandering in the feeding line and its offset acts as a self matching network that enables open stop-band (OSB) elimination at broadside. Consequently, there is no extra matching circuit used in the unit cell which facilitates easy analysis and optimization. The optimized broadside frequency (fB) for the P-LWA is 7.7 GHz. To verify the proposed concept, a prototype of the proposed P-LWA is fabricated and measured. The measured value of impedance bandwidth and maximum realized gain are 36% and 15.4 dBi, respectively.

Busineni Mahesh Kumar

Papers

Symmetric periodic leaky-wave antenna for open stopband suppression

Offset-Meandering Line Fed-Patch Periodic-Leaky Wave Antenna for Scanning through Broadside and Consistent Gain