2D-Periodic Over-Wave-Range Antenna Array of TEM Horns with a Feeder
- PDF / 2,334,812 Bytes
- 7 Pages / 612 x 792 pts (letter) Page_size
- 39 Downloads / 135 Views
NNA AND FEEDER SYSTEMS
2D-Periodic Over-Wave-Range Antenna Array of TEM Horns with a Feeder V. A. Kaloshina, * and N. T. Leb, ** a
Kotelnikov Institute of Radioengineering and Electronics, Russian Academy of Sciences, Moscow, 125009 Russia Institute of Physics and Technology (National Research University), Dolgoprudnyi, Moscow oblast, 141701 Russia *e-mail: [email protected] **e-mail: [email protected]
bMoscow
Received August 22, 2019; revised August 22, 2019; accepted October 23, 2019
Abstract—Electrodynamic simulation based on the finite-element method is used to study characteristics of a plane 2D-periodic antenna array consisting of 32 TEM horns with a feeder. For each of two power dividers in the feeder of the array, the reflection coefficient is less than –25 dB in a frequency interval of 0.3–7 GHz. The antenna array is matched with the feeder system at a level of –10 dB in the in-phase mode for scanning in a sector of 90° in the H-plane (E-plane) with a bandwidth of 19 : 1 (15 : 1). DOI: 10.1134/S1064226920090041
INTRODUCTION Development of ultrawideband (UWB) and multirange radio electronic systems is related to development of scanning narrow-beam antennas that work in a relatively wide frequency range with an upper-tolower frequency ratio of greater than 10 : 1 (more than one wavelength range). Phased arrays (PAs) with a working bandwidth of 10 : 1 may serve as over-waverange scanning antennas. Several problems are encountered in the development of over-wave-range PAs, in particular, matching of an array the period of which is significantly less than the wavelength. Antenna arrays of TEM horns have been studied in the absence of screen in [1–4]. Such arrays have been matched in a wide frequency band. The electrodynamic simulation of [4] has shown that in-phase infinite arrays of TEM horns can be matched in a frequency band of greater than 40 : 1. For the scanning in the E-plane in a sector of 90°, the matching band decreases to 27 : 1. The matching band for a 36-element array in the in-phase mode is 10 : 1, and the bandwidth is 7 : 1 for scanning in a sector of 60°. Relatively high level of backward radiation is a significant disadvantage of the arrays without screen. Antenna arrays with screens have been studied in [5–10]. Infinite and finite (144 elements) 2D-periodic arrays of TEM horns with metallization of the interhorn space and an in-phase matching band of 10 : 1 have been studied in [5–10]. For the scanning in a sector of 90° in the Н-plane, the matching band of the infinite array was 10 : 1, and the matching band was 5 : 1 for scanning in the Е-plane.
Dual-polarization antenna arrays have been studied in [7–10]. The arrays of [7, 8] consist of 64 elements ((8 × 8) that represent a nonuniform slot line. For the in-phase mode, the matching bands of the arrays were 12 : 1 [7] and 9 : 1 [8]. For scanning in sectors of 90° and 60°, the matching band decreases to 8 : 1 [7] and 7: 1 [8], respectively. A dual-polarization array consisting of 576 (24 × 24) conductors with variable square cross sectio
Data Loading...
