NRD guide Gunn oscillator with medium power and low phase noise at 60 GHz

Abstract

Abstmd -Small sized and high performance millimetep wave source, which consists of Gunn diode mount, circulator and matched load, was developed based on the NRD guide technology at 60 GJh. Main emphasis was placed on compatibility with rectangular waveguide systems. A transition between an NRD guide and a rectangular waveguide was devised and fully optimized by using electromagnetic simulator (HFSS). Good advantages such as a medium level output power of 13 dBm, a small phase noise less than -113 dBc/Hz for 300 kB[z offset, and a small frequency stability less than -1.3 p p d C were obtained. The size is smaller than that of a name card. It is confirmed that the performance of the developed Gunn oscillator is higher than that of a commercially available rectangular waveguide type GUM oscillator from the viewpoint of the output power, phase noise, and frequency stability.Index Tenns -NRD guide, Gunn oscillator, transitions, Low phase noise, temperature coefficient.

Design of Half Mode Substrate Integrated Waveguide Gunn Oscillator

“…The power output level is 13.2 dBm. The free running phase noise was measured according 10 [9], [15], [16], at millimeter wave band microstrip or waveguide fin-line Gunn oscillator' phase noise is relatively high, ranging from −87 to −70 dBc/Hz at an offset frequency of 100 kHz. Metal cavity resonator and NRD guide Gunn oscillator' phase noise is relatively low, ranging from −132 to −87 dBc/Hz at an offset frequency of 100 kHz, but they are not planar structures and their fabrication is relatively complex.…”

Parallel type substrate integrated waveguide Gunn oscillator

“…In the past, various approaches have been tried to reduce the phase noise and increase output power of millimeter wave oscillators. According to published references [1,2], we found that at millimeter wave band microstrip or waveguide-fin line Gunn oscillator' phase noise is relatively high, ranging from Ϫ85 to Ϫ70 dBc/Hz at an offset frequency of 100 kHz. Metal cavity resonant cavity and NRD guide oscillator' phase noise is relatively low, ranging from Ϫ132 to Ϫ85 dBc/Hz at an offset frequency of 100 kHz.…”

“…The implementation selected to achieve the NF-FF transformation can be based on different approaches. In 1978, Borgiotti [2] presented an integral formulation using a superposition of plane waves to obtain the far field from the measured near field. Later, in the works published by Hansen [3], Yaghjian [4], and (the "Handbook of Antenna Design," 1982) [5], a second methodology was detailed.…”

A 55GHz 5-pole NRD guide E-plane bandpass filter for millimeter wave OFDM applications

“…The configuration of the BPF with waveguide input/output ports is shown in Fig.3, and its equivalent circuit in Fig.4. The transition between NRD guide and rectangular waveguide (WR-15) is designed based on reference [6] and the CAD optimization, and the obtained dimensions are also given in Fig.3. The coupling coefficient k i,i+1 and the external Q (Q e ) can be calculated by using the well-known formulas [7].…”