In this paper, A 7.2 GHz dual-core H-shaped-inductor based voltage-controlled oscillator (VCO) with single-mode oscillation is presented. The VCO utilizes a novel 6-port H-shaped structure formed by coupling two single-turn inductors, which effectively suppresses unwanted oscillation modes and enhances the quality factor (Q) of the desired mode. Furthermore, a noise compensation technique is proposed, which employs varactors to mitigate thermal noise induced by bias resistors, thereby improving the VCO’s overall performance. Implemented in a 110 nm CMOS process, the VCO consumes 39.6 mW and achieves a phase noise of -128.9 dBc/Hz at a 1 MHz frequency offset from a 7.2 GHz carrier frequency, with a corresponding figure of merit (FoM) of 190.1 dBc/Hz.