A quadri‐band frequency independently tunable patch antenna with high frequency ratio is proposed in this article. It is realized by nesting two rectangular patches and two U‐shaped patches together separated with gaps. Each patch is resonating at one band. U‐shaped patches are utilized to suppress the spurious‐mode resonances when designing antenna with high frequency ratio. Two parallel varactors are embedded on each patch to tune its resonant frequency. Measured results demonstrate the quadri‐band antenna has tunable ranges of 0.75–0.97, 1.87–2.11, 2.37–2.63, and 3.36–3.72 GHz, respectively, with a high frequency ratio of 5, low spurious‐mode resonances, comparatively high gains of 2–8 dBi and efficiencies of 30–80%.